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Old May 27th, 2011, 08:37 AM   #1
forbitel
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DIY EFI KIT for our 250r

First at all thanks for all the help, opinions, suggestions etc I have received from this forum to make this project a success. Also thanks to Matt from Ecotrons for being so helpful through the entire process.

Difficulty: Medium (not really that hard to be honnest just requires some knowledge about EFI systems, patience and so ingenuity to solve small issues that you might run in to)

- If you don't know anything about EFI systems I suggest you buy a book like THIS , it honestly helped me a lot to understand what a EFI does and how it does it.

Time required: Took me 3 half Sundays, this includes the time consumed trying to look for solutions and best way to do stuff, so if you follow this guide i bet you will take less than me, you might be able to do it in a weekend if you dedicate the time and effort for it.

The KIT:
Kit's Packaging



Components (source: ecotrons.com):

ECU
Harness
Throttle Body (twin 28mm Throttle body (including TPS sensor)
2x Fuel injector (80g/min)
Fuel pump assembly (Fuel pump (25L/h)
Fuel pressure regulator(3bar)
Fuel filter
fuel hoses and clamps
MAP sensor (1.05bar)
Engine temperature sensor
Intake air temperature sensor
2x Oxygen sensor and bungs
Serial communication cable (to a computer)
Serial to USB converter (optional)
CD - free tuning software

The 28mm dual Throttle body and manifolds


Installation:

- I decided to install it in mine (right) and leave my wife's bike (left) untouched so i can compre the results later on, either way she wouldn't let me take hers apart



1 - Remove the fairing of the bike as described in DIY- Let's Get Nekkid!!! THANKS KKIM!



2 - Drain the fuel tank by first disconnecting the vacuum line from the petcock (to avoid flowing fuel, make sure the it is in the ON position), removing the fuel line that goes from the carbs to the petcok (i removed it at the carbs without spilling but you could put a rag in place just in case). Use a funnel and a gas container to safely store the fuel. once you have the funnel and container in place, open the petcock by setting it to the PRI position with a flat screwdriver. at this point you can open the fuel gas tank to speedup the draining.



3 - Remove the fuel tank from the bike as described in DIY- How to Remove the Gas Tank Thanks again to KKIM!. At this point your bike should look like this:


Gas Tank Modification
4 - You will need to add a return line to the fuel tank. If you are a lucky one with a Cali spec bike you could use the fuel return line that comes already in that tank. For the rest of us, you will need to create your own, here is what I did for mine:

- Remove the petcock and the fuel level sender.
- Remove the paint in a small round section of the bottom of the tank, Choose a flat (not curved) surface so the new fitting will seat flat on the wall of the tank
- Cut a hole in the tank with the appropriate diameter for the fitting that you choose.


- Here is the fitting I used, a 5/16 brass hose fitting with couple brass washers.


- I carefully placed the fitting in the tank by holding the other end from the fuel level sender hole. You can use a gasket sealant to seal the fitting, but make sure that you use a sealant resistant to gasoline. you can now re-install the petcock and the fuel level sender, but allow the sealant to dry before you can use the tank again. I left it drying 24 hours before using it.


5- Throttle body installation:

- You will now be ready to install the throttle body, first we need to remove the carbs as instructed in by TheDuck HERE, thanks to Da Duckman!
- Install the rubber rings that come with the kit, they will allow you fit the carbs boots that came with the bike to the new throttle. the kit also comes with adapter boots that connects to the existing air box.



- next, install the accelerator cable into the throttle body. for now, I'm not using the de-acceleration cable, so I just removed it [Read Update Below, I ended up re-installing the De-acceleration cable]. Remember to adjust the cable play after installation, the manual's spec says around 2-3mm play.


6- Fuel Lines Installation:
Below is the fuel system schematics taken from the installation manual tha comes with the kit


I however replaced the filter from the kit with a pressure rated filter and installed it between the pump and the injectors fuel rail. Notice that the pressure regulator is installed after the fuel rail (after the fuel filter), this ensures that the pressure in the rail is set due to the rating in the regulator, if you install the filter after the regulator and before the rail, you will have a pressure drop due to the filter flow restriction.



System Sensors
- The system uses several sensors to monitor in real-time the engine, ambient conditions, and user's demand to ensure the optimal Air/Fuel ratio.

Air Temperature Sensor:
- I installed the air temperature sensor in the same location than the OEM EFI bikes, at the top of the Air Filter Box. However, if you modified/removed the filter box you will have to find a new location for the sensor, for example inside housing of your filter pods.
- First drill a hole slightly bigger than the sensor's diameter. Use a rubber seal to ensure that the sensor will remain in place and will not come off.


Engine Temperature Sensor
- I installed the engine temperature sensor right in top of the engine, this way it will give a close estimate of the engine head temperature.




Throttle Position Sensor (TPS)
- the Throttle position sensor comes already pre-installed in the throttle-body/manifold. So all is left is connect the electrical connector on it.



Manifold Absolute Pressure sensor (MAP):
- The MAP sensor measures the pressure of the air in the manifold (Same as Throttle body assembly in this case) to determinate the amount of air coming into the engine. The throttle body in this kit is made out two single throttle bodies joined, for this reason you will see two manifold pressure outlets but we will need only one, the other NEEDS! to be plugged to avoid air leakage into the engine. I plugged mine with a small rubber cap and a small hose clamp.

- Use the outlet for the cylinder #1 (this is the one in the left hand side when your are setting on the bike), and plug the second outlet. If you do not plug the other outlet, air will be allowed to enter the cylinder#2, bypass the throttle body's plate and the system will believe you want to accelerate, as a result you will end up with and unbalance and accelerated engine. Ask me how I know



- The manifold pressure outlet form the throttle body assembly/ manifold, is connected to the MAP sensor through a small rubber hose. When choosing the location of the MAP sensor, make sure you don't bend the hose to the point of obstructing the air flow, otherwise you wont read the real air pressure of the manifold.



Oxygen Sensors:
- One of the beauties of EFI is the usage of oxygen sensors that will allow a closed loop control system, this is, the system will monitor the amount of oxygen at the exhaust and determine if the previously burned Air/Fuel (A/F) resulted in a lean or rich condition, so it can fine tune itself to bring back the A/F back to optimal, additionally the system can learn from this fine tuning, and save it in memory so next time the engine is in a similar situation the mixture will be delivered already corrected. This kit have the ability to monitor and control two loops, in this case each loop is used for each cylinder so it can fine tune each cylinder independently, so you will need to install 2 oxygen sensors that are already included.
- I have chosen to install the sensor close to the engine so the heat of exhaust gases will help to heat up the sensor. notice that the Oxygen sensor only work after they have heated up. I took my exhaust pipe to a local welding shop to have the sensor bungs welded to the pipes.
- Be careful where you have the welding done, many muffler shops where I took it told me they could not do the job because the pipe was too small (diameter) and they were afraid the their big torch tools could just cut right trough it. Usually a welding shop have more specialize tools and have more experience doing small jobs like this. It only took about 1 hour in my case.

- Here is location of both sensors after re-installing the exhaust pipe into the engine block:


EFI's ECU (Computer) "The Brain":
- I connected each single sensor to the harness provided and routed the harness towards the EFI ECU which I located where the Ignition controller was located, relocated the ignition controller in top of the battery, and relocated the relays from the top of the battery to the frame close to the battery.



- You will need to connect the negative wire (-12V, Black on the kit) to the negative of the battery, the 12+V Red wire on the kit to the positive of the battery, to provide power to the ECU.

- The ECU needs to sense the presence of the Key in the ON position in order to begin the pre-pump cycle, commanding the pump to give the fuel line the required pressure before turning on the engine. For this, you will need to tap the KEYSW (Pink) wire on the harness of the kit to the Brown/Black (BR/BK) wire in the Ignition Controller unit, this is a 10A fused line that will provide 12+V and enough current for the ECU when the Key is in the ON position. Note: I tried taping to the Gray wire in the Ignition Controller that supposed to give me the same signal when ON, but this did not provide enough current, so the ECU will not operate, bump!.

- Additionally the ECU need to know the engine speed and Crank position in order to know when to activate the injectors. for this you will need to tap the crank position sensor as follow: CKP, ORANGE wire in the kit to the Yellow (Y) Wire in the Ignition controller (this is the positive of the Crankshaft position sensor), and the GND, GREEN on the KIT (Crankshaft sensor ground) to the BLACK/WHITE in the Ignition Controller.


Testing
- before you attempt to turn the engine on, let make sure that we connected everything to the harness:
- turn the key to the ON position, and make sure that you hear the pump working for few seconds, this is to pre-pressurize the fuel lines before ignition.
- If it does, now check the Check Engine lamp, and see if it is ON. If it is, something might be wrong, if this is the case you might want to connect the serial port to the PC and read the DTC from the system, it will tell you what the ECU is complaining about, for example a sensor (if you forgot to connected).
- If the pump turns on, and the ECU does not complains with a Check Engine Light, all should be good to give it a initial try. Turn that baby ON!


Iddle Speed Adjustment:
- The final adjustment is the idle speed, the throttle body have an idle screw that you can rotate to adjust the idle speed. However, ecotrons told me they already pre-adjusted it for us, so we should not mess with it unless you notice that your bike is not idling at the right speed and if it is you have already verified that the problem is not a air leakage. Ask me how I know!


- I set my idle speed by turning the idle screws on the throttle body, while having my laptop connected to the ECU, that way I could have in the software the correct idle reading. I set it to about 1350, just as the manual says. I know some prefer to rise it to about 1500, so it is your choice. Be sure that you adjust the screw the same amount for both cylinders, otherwise you will end-up with an unbalance engine that would not idle correctly



Final Re-Assembly:
Serial port:
- For final reassembly you will need to find a place for the serial port, you will want a place that is easily accessible without having to take any fairing off, I have placed it on the second seat compartment, that way if i need to connect it to my laptop I just have to remove the rear seat, That location will even make it easier to log data on the road, I usually connect it to my laptop which I carry in my backpack when I want to gather data and see how the system is doing.



Check Engine Light and RICH/ECO mode Switch:
- I will leave the location of these 2 to your choice. I decided not to locate the check engine light in the dash since I'm planning to install a KOSO dash which have an input for the Check Engine light already. The RICH/ECO mode switch I'm planning on installing it on the right handle bellow the engine kill switch, but I still have to find a nice switch that will look good.

- The rest is to put the fairing together by following the DIY- Let's Get Nekkid!!!, by KKIM, in reverse.

Personal opinion about the results:
- First, the kit was really not to difficult to install, this was the first time I ever took a bike apart, and I got it done!, just take the time to do it right and do not rush. having some knowledge about EFI system will definitely help, although the instructions that came with the kitt will get you through, hopefully this DYI helps you as well.

- Performance wise, I was surprised how much improvement can you get with this mod:

- Throttle response is much crisper, the throttle response is much faster without any lag. My EFI bike now redlines much quicker than before.

- Acceleration seems stronger too, I mentioned that I have a twin bike (my wife's) which remains carburated, and after driving mine, hers seems laggy to reach the 60's.

- Unfortunately, I have no dyno number to prove it, BUT I'M REALLY HAPPY WITH MY EFI kit and do not regret the change.

- Top Speed, I reached 95 @ 12kRPM. Tested on the tracks of course, keep it legal. Notice that besides removing the snorkel, I have not made any other mods, the bike still have stock airbox, and stock exhaust pipe and stock muffler, which I plan on upgrading in the future.

- Fuel Economy, Well these bike are already great in that field, so not much change here. I measured the mileage 3 time (3 full tanks) and consistently got 225-235 miles per 4.2gallons, which makes 53-56MPG. Notice, that I drive 80% highway at highway speed, which means high RPMs in these bikes, and usually shift at 9kRPM and occasionally redline from time to time. I hear shifting a 6kRPM gives you a better MPG, but I like the fun. According to the kits information, the ECU also have a Fuel cut-off feature that cuts the fuel when we close the throttle from a high RPM, i.e when stopping for a red light, that way the engine does not waste fuel if you just want to stop, so that should save some gas.

- Cold engine start, This is a really nice improvement. I usually leave to work early morning, and live in a mostly cold weather, OHIO. The bike rarely turned on at the first attempt when carburated, even when I have it choked all the way. Now, it will turn on right away, and the RPM is pretty stable allowing you to ride on right away if you need to. However, I usually wait few seconds since engines usually get more worn out if you ride them without proper warming, at least that is what I hear. Have you noticed, how unstable is the RPM in cold conditions, it will be really low and stalling until it warms a little, then it will rise to normal idle RPM, this is gone, It will bring the RPM to idle speed right away.


I hope this guide help you along the way if you decide EFI is for you.
PM me of you have any questions,

Forbitel.

Last futzed with by forbitel; July 23rd, 2011 at 03:46 PM.
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Old May 27th, 2011, 08:40 AM   #2
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Old May 27th, 2011, 05:32 PM   #3
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i'm in if there a group buy
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Old May 27th, 2011, 07:28 PM   #4
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Sounds great but the price tag kills it for me plus I'm sure the instalation is above my level
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Old May 28th, 2011, 09:02 AM   #5
forbitel
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OK guys and gals, I decided to pull the trigger and just ordered the EFI kit for my ninjette from Ecotrons, the guy I contacted at Ecotrons (Matt) seems to be really helpful and said he will guide me through the conversion process. I hope all it goes great and that we make this possible. I will keep all of you updated.
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Old May 28th, 2011, 09:47 AM   #6
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Quote:
Originally Posted by forbitel View Post
OK guys and gals, I decided to pull the trigger and just ordered the EFI kit for my ninjette from Ecotrons, the guy I contacted at Ecotrons (Matt) seems to be really helpful and said he will guide me through the conversion process. I hope all it goes great and that we make this possible. I will keep all of you updated.
Sounds great, please post a build thread on it and add lots of pictures. Curious to see how it works.
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Old May 28th, 2011, 03:49 PM   #7
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Subscribing to this thread. :-)
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Old May 28th, 2011, 04:45 PM   #8
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Someone decided to do it! This will be interesting... Good luck with the mod. I'm sure it will be fun!
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Old May 28th, 2011, 04:56 PM   #9
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Quote:
Originally Posted by forbitel View Post
OK guys and gals, I decided to pull the trigger and just ordered the EFI kit for my ninjette from Ecotrons, the guy I contacted at Ecotrons (Matt) seems to be really helpful and said he will guide me through the conversion process. I hope all it goes great and that we make this possible. I will keep all of you updated.
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Old May 28th, 2011, 05:40 PM   #10
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Old May 28th, 2011, 05:52 PM   #11
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interesting
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Old May 28th, 2011, 09:25 PM   #12
forbitel
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I just received confirmation that my order will be shipped next Tuesday, but in the mean time I'm trying to get as much understanding of the Fuel Delivery in our bikes, I'm comparing the service manual of both carb version and Euro EFI version to have an idea of what will need to be replaced and what can be used. But having myself more experience with electronics systems rather than mechanics I will need as much help from the expert ones in this forum. So first couple questions:

1. Does anyone one knows if our gas tank has a return line? I see in the manual what it looks like an out fuel line, a outlet for vapor fuel but I cant tell what is the third one for?
- we need a return line since the new fuel pump needs to use a fuel pressure regulator that will return gas to the tank to avoid over pressure in the fuel rail.

2. According to our manual, we have a canister to recover vapor fuel, but it does not indicates if it recover the vapor from the carbs, which I assume it does. Since we are removing the Carbs, do we still need the Canister?
See (2)in the picture


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Old May 28th, 2011, 09:30 PM   #13
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Do you have a CA model bike? Both your questions only apply to CA bikes since yours should only have the overflow hose out of the left side of the tank and you shouldn't have the canister.

And no, you don't need the canister:

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Old May 28th, 2011, 09:41 PM   #14
forbitel
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Thanks Cuong, that will make it easier then.
Although, I was hopping to have a return line in the tank for the pressure regulator. otherwise, I might have to add that to the tank.
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Old May 28th, 2011, 11:10 PM   #15
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Awesomeness! I can't wait.
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Old May 29th, 2011, 03:17 AM   #16
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If you don't have a California tank you can use the gas gauge sender hole for a return line by making a plate. Or make a new petcock with two lines one out or one in . It would be difficult to add a fitting. But possable . Maybe a fitting with a nut on the inside,but it would be hard to get a wrench on it. Welding on the tank is difficult because the metal is very thin.
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Old May 29th, 2011, 04:40 AM   #17
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Petcock?

How does the petcock come off. Would there be room in the vacated opening for a plate or plug with nipples for supply and return? Extend the return nipple up inside to keep any bubbles from getting sucked back in.
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Old May 29th, 2011, 05:21 AM   #18
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The petcock has a two bolt flange. The thing to do is make a flange with a pipe like ypu suggest . And an opening going to a shut off . Though the fuel pump will really hate it if you forget to open the shut off valve.
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Old May 29th, 2011, 06:32 AM   #19
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No shut off?

Probably won't need any shut off. None of the car systems I work on have any kind of tank shut off and run a pressurized fuel tank/ evap system (fuel cap puffs out at you on removal). Injectors rarely leak with full system pressure on them so should be very safe from just a gravity feed with the bike parked. I would use an extra straight coupling in the supply and return hoses somewhere handy between the tank and the next component to allow the use of clamps to make tank removal easier.
I have adjusted my idle mixture richer but other than that will probably just ride the bike stock for the rest of the summer and then go after the fuel injection/ pipes as a winter project.
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Old May 29th, 2011, 06:49 AM   #20
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YA I was thinking that .BUT when you go to pull the tank to do anything you will have to shut off the flow some how. Pressurizing the tank for evap will make the cap whistle all the time. How dose the euro tank work?
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Old May 29th, 2011, 07:11 AM   #21
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Filter placement

I would also consider getting a pressure rated fuel filter (regular off the shelf automotive type from a discount store) to add right after the fuel pump. This is a serious ommision to this kit because the main thing that needs filtering out is the metal filings that are normal break in and wear from an electric fuel pump. Having the only filter in the system located before the pump isn't right at all.
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Old May 29th, 2011, 07:45 AM   #22
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Quote:
Originally Posted by sendler View Post
I would also consider getting a pressure rated fuel filter (regular off the shelf automotive type from a discount store) to add right after the fuel pump. This is a serious ommision to this kit because the main thing that needs filtering out is the metal filings that are normal break in and wear from an electric fuel pump. Having the only filter in the system located before the pump isn't right at all.
+1
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Old May 29th, 2011, 08:31 AM   #23
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Take some pics and video when kit comes in
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Old May 29th, 2011, 09:03 AM   #24
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There needs to be an automatic fuel shut off. If you lay this bike down you don't want this thing to keep pumping fuel. This is why FI bikes come with tip over sensors.
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Old May 29th, 2011, 09:09 AM   #25
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Quote:
Originally Posted by sendler View Post
I would also consider getting a pressure rated fuel filter (regular off the shelf automotive type from a discount store) to add right after the fuel pump. This is a serious ommision to this kit because the main thing that needs filtering out is the metal filings that are normal break in and wear from an electric fuel pump. Having the only filter in the system located before the pump isn't right at all.
I agree the main reason of having a fuel filter is to avoid the the injectors to get clogged with dirt, so it would make sense to have the filter right before the injectors. However I have seen many system that have the filter before the pump.

filter before the pump:




Pressurized filter after the pump:



I will keep looking for more information, but If it is better to have a filter after the pump, I will start looking for a pressure rated filter then. Now the question is, if we use a filter after the pump, where do we put the pressure regulator, I bet the filter will produce some pressure drop so should we put the regulator after the filter? What do you think? Well actually the last figure kinda answer the question, it looks like the regulator is after the filter.
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Old May 29th, 2011, 09:09 AM   #26
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Originally Posted by caliente103 View Post
Take some pics and video when kit comes in
Sure I will
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Old May 29th, 2011, 09:28 AM   #27
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Right after the pump

Quote:
Originally Posted by forbitel View Post
so should we put the regulator after the filter?
I would put the filter right after the pump. It doesn't really need one before the pump but if the plastic one that comes with the kit isn't suitable for use in the preasure side, you may as well use it as a pre filter in the hose coming down from the tank to allow for one of the clamp off points for easy tank removal.
.
The fuel pump is apparently triggered by the fuel computer with a short, timed build up for starting and then continued operation only with the presence of an rpm signal. A tip over switch would help keep the engine from oil starvation in the event of an unconscious rider with the bike on it's side but shouldn't be all that critical of an ommision because anything that causes the engine to stop, such as a wreck with a rupture of the fuel system, should also kill the fuel pump.
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Old May 29th, 2011, 01:10 PM   #28
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Quote:
Originally Posted by sendler View Post
.
The fuel pump is apparently triggered by the fuel computer with a short, timed build up for starting and then continued operation only with the presence of an rpm signal. A tip over switch would help keep the engine from oil starvation in the event of an unconscious rider with the bike on it's side but shouldn't be all that critical of an ommision because anything that causes the engine to stop, such as a wreck with a rupture of the fuel system, should also kill the fuel pump.
Think about that

If the engine stalls in the wreck, the fuel will stop. OK. What if the engine doesn't stall right away?
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Old May 29th, 2011, 03:20 PM   #29
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Tip over switch

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Originally Posted by rockNroll View Post
Think about that

If the engine stalls in the wreck, the fuel will stop. OK. What if the engine doesn't stall right away?
Do you have a source for a tip over switch?
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Old May 29th, 2011, 03:36 PM   #30
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after looking at this kit..it's not very well thought out.
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Old May 29th, 2011, 03:47 PM   #31
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Originally Posted by sendler View Post
Do you have a source for a tip over switch?
I do not. Maybe a Ford inertia switch might work?

On the 1000RR there's a bank angle sensor (Honda's name) as an input to the PCM and there's a fuel cutoff relay which receives an output from the PCM. When the bank angle sensor tells the PCM the bike is sideways the PCM kills power to the relay, which shuts down the fuel pump.
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Old June 5th, 2011, 09:13 AM   #32
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Although this system isn't well thought out (filter between pump and injectors, fuel kill device, etc) it shouldn't be that difficult to incorporate these items into the system.

Forbitel, maybe you already have, but could you bring these items up to your contact at Ecotrons.com? Maybe they have explanations for this, or solutions. With the experience that we have on this forum, it couldn't be that hard.
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Old June 6th, 2011, 05:00 AM   #33
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Quote:
Originally Posted by DmbShn41 View Post
Although this system isn't well thought out (filter between pump and injectors, fuel kill device, etc) it shouldn't be that difficult to incorporate these items into the system.

Forbitel, maybe you already have, but could you bring these items up to your contact at Ecotrons.com? Maybe they have explanations for this, or solutions. With the experience that we have on this forum, it couldn't be that hard.
Todd, I agree, those are minor things that can be easily fixed and adapted to our bikes. I will definitely bring those suggestions to them, I'm pretty sure they will take in consideration for new revisions of the kit. One thing that I'm trying to figure out before I receive the kit is the fuel return line.
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Old June 6th, 2011, 05:04 AM   #34
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Not all automotive systems have fuel return. Junk builds up in the fuel rail after a couple years. I think it was on Chevy's. But it has been a while.
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Old June 6th, 2011, 05:17 AM   #35
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Remove petcock

Quote:
Originally Posted by forbitel View Post
Todd, I agree, those are minor things that can be easily fixed and adapted to our bikes. I will definitely bring those suggestions to them, I'm pretty sure they will take in consideration for new revisions of the kit. One thing that I'm trying to figure out before I receive the kit is the fuel return line.
I think the easiest way will be to give up the petcock, which would probably need to be run in the prime position anyway. Make a flat plate with the fuel supply and return pipes threaded through to bolt on in it's place. You may want to run a hose on top of the return line in the tank to route the returned fuel around the bottom side of the tank to avoid noise from having a fountain showering off of the top of the tank.
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Old June 6th, 2011, 05:42 AM   #36
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Needs it

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Not all automotive systems have fuel return. Junk builds up in the fuel rail after a couple years. I think it was on Chevy's. But it has been a while.
Those cars have the regulator right in the fuel filter so there is a return in the system but you don't see it happening because it is right in or at the tank. This FI conversion kit definitely needs a return hose which will be flowing quite a bit of volume. Maybe 1 liter/ minute.
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Old June 6th, 2011, 07:30 AM   #37
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Originally Posted by sendler View Post
Those cars have the regulator right in the fuel filter so there is a return in the system but you don't see it happening because it is right in or at the tank. This FI conversion kit definitely needs a return hose which will be flowing quite a bit of volume. Maybe 1 liter/ minute.
With a returnless fuel system the fuel regulation is done at the pump, inside the tank. The fuel never leaves and then reenters the tank. There may be a system with return from a fuel filter/pressure regulator but it would have to be from the Germans or Sweedes and I have yet to see it.
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Old June 6th, 2011, 08:22 AM   #38
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Mercedes

Quote:
Originally Posted by rockNroll View Post
With a returnless fuel system the fuel regulation is done at the pump, inside the tank. The fuel never leaves and then reenters the tank. There may be a system with return from a fuel filter/pressure regulator but it would have to be from the Germans or Sweedes and I have yet to see it.
Mercedes 202 have the regulator in an external flilter under the car near the tank. CIS and HFM systems had the regulator after the rail so, full circuit flow. ME moved the regulator to the back, similar to this kit so, any filings or debris from opening the system tends to go to the fuel rail and stay there. Some of the pictograms posted earlier in the thread show the filter preceding the pump. This is the case with the new direct injection deisel and gas engines which use injection pressures up into the hundreds of bar so the pumps are extra fussy about dirt and need the filter in front of them and the high pressure would make the filter can too expensive and heavy to position after.
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Old June 6th, 2011, 10:09 AM   #39
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Originally Posted by sendler View Post
Mercedes 202 have the regulator in an external flilter under the car near the tank. CIS and HFM systems had the regulator after the rail so, full circuit flow. ME moved the regulator to the back, similar to this kit so, any filings or debris from opening the system tends to go to the fuel rail and stay there. Some of the pictograms posted earlier in the thread show the filter preceding the pump. This is the case with the new direct injection deisel and gas engines which use injection pressures up into the hundreds of bar so the pumps are extra fussy about dirt and need the filter in front of them and the high pressure would make the filter can too expensive and heavy to position after.
Figures... Germans! (I'm part German btw, so no flaming)
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Old June 6th, 2011, 12:26 PM   #40
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