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Old May 12th, 2018, 08:57 PM   #1
JA-Moo
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Is the Power commander what I'm looking for?

On the 2013 300 I picked up, it has a Delkevic slip on, and I am at 5500 ft. of altitude. Thick black soot in the pipe. Will a power commander be able to compensate? Or is there something better? I'm a carb guy, so totally lost here.
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Old May 13th, 2018, 12:14 AM   #2
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The power commander allows you to change all the fuelling parameters.
The software gives you a spread sheet with RPM down the side and the fuel values across, you can change all of these values.
The problem is if you have no way of measuring the results of the changes you have made you could end up with damage to the motor.

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Old May 13th, 2018, 12:23 AM   #3
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IE dyno time........
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Old May 13th, 2018, 06:24 AM   #4
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I would have though a good FI system would compensate for altitude automatically.
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Old May 13th, 2018, 07:15 AM   #5
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Quote:
Originally Posted by Triple Jim View Post
I would have though a good FI system would compensate for altitude automatically.
Good ones do.....LOL Others look like they need power commanders.


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Old May 13th, 2018, 09:00 AM   #6
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Maybe one of the sensors is not working.
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Old May 13th, 2018, 09:13 AM   #7
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Something is wrong, fix that instead of trying to compensate.

- Measure vacuum at MAP sensor with warmed up engine
- check for intake leaks around boots, hoses, clamps
- measure impedance of air-temp sensor
- measure impedance of engine-coolant sensor

Make sure someone hasn’t wired in one of those stupid pots that lets you “adjust” engine coolant sensor and changing data about operating conditions that’s sent to ECU, thus tricking ECU into injecting more fuel. Very few EFI systems need more fuel, they tend to tend too rich for safety. Toyotas are worse with 10:1 AFRs in high-end, wasting tonnes of fuel and power.

Only use PC to tune and lean out mixtures to optimum 13.5:1 once you’ve got system working perfectly stock (yours isn’t). Here what stock 300 AFR curve looks like, too rich in high-end at 12:1. Leaning it out results in +4% more power without any mods needed!


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Old May 13th, 2018, 02:45 PM   #8
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Thanks Dan!
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Old May 13th, 2018, 10:47 PM   #9
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You're welcome!

I also forgot to mention that while older flow-based load-sensing algorithms such as AFM or MAF requires separate altitude sensor to make adjustments, MAP-sensing does it automatically!! At sea-level under WOT, MAP sensor would register about 100kpa and at 5500ft, it would measure around 80kpa and send that to ECU. The ECU would know that there's less air going into engine and will meter out the correct amount of fuel anyway.

At idle and partial-throttle, due to restriction of throttle-plate, intake-manifold will be under vacuum condtions and that won't vary as much with altitude. MAP sensor should be registring around 33-36kpa at idle. Verify that with vaccum gauge with T-connection at MAP-sensor nipple.

Even with carb, the 20% difference in fuel requirements wouldn't cause that much soot on your exhaust. Something's off.

If your bike is CA model, it will have an oxygen sensor. Make sure it's plugged in and not bypassed with resistor. If you have oscilloscope, you can also inspect output waveform of O2-sensor. Should be roughly +/- 0.4v sinewave above & below 0.485v.

Also check your TPS sensor. Measure output voltage and idle and WOT.
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Old May 14th, 2018, 12:40 AM   #10
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OK, now things are way over my head. I don't believe it's a CA bike, and the rest, time for a manual.
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