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Old December 9th, 2017, 12:12 PM   #1
Frank06
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[300] Anybody Using O2 Sensor to Collect Data?

I just bought a 300 Ninja as a race bike. It has a slip-on and a PC5, so the stock O2 sensor isn't really doing anything. Is anyone using the sensor to grab data? Any hints appreciated!

TIA
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Old December 9th, 2017, 12:25 PM   #2
DannoXYZ
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Stock O2-sensor is still in use everywhere except at WOT. It only provides data to maintain 14.7:1 AFR under partial-throttle conditions.

If you want to gather really useful data for tuning and getting optimum power, then you'll want to install wideband O2-sensor after getting a full aftermarket exhaust system. Main bottleneck is factory exhaust and catalytic. With wideband data AND dyno-tuning, you can extract extra power from 300 with just fine-tuning the fuel-maps. As with carbed bikes, EFI bikes have factory set-up with way too much fuel under WOT in the high-end around 12.0:1 AFR



Leaning this out to 13.5:1 where NA engines make most power gets you an additional 4bhp! The PC is great because it lets you make +/- adjustments to fuel-mapping in 100-rpm increments. Such as subtracting 10% fuel at 8500rpm, removing 2% at 9700rpm and taking out 10% at 11000rpms. No way you can do that kind of fine-tuning to yield perfectly flat fuel-curve and major boost in power with carbs. That's 4 BHP or 13% more power from just a couple of mouse-clicks!!! buwahahahahahahaa
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Old December 9th, 2017, 12:34 PM   #3
Frank06
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Are you sure? I haven't followed the wiring but the installation instructions I saw online said to unplug the stock sensor (it's replaced with something called an O2 optimizer) and it could be removed if wanted.

I had assumed (hoped?) the stock sensor was wide-band but maybe not. The map it has now works but I thought it'd be interesting to check F/A ratio.
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Old December 9th, 2017, 12:42 PM   #4
DannoXYZ
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What year is your 300? I don't think the 2013-14 US models had O2 except for California?

WIth PC, it's an option to remove, but you'll have to do A LOT of re-tuning of entire fuel-map. Idle and partial-throttle from 10% to 90% throttle. That's like 1000 data-points you have to adjust. The factory ECU does that for you with O2-sensor. No need to re-do a lot of the factory's engineering for no better results.

What you're only really interested in adjusting is the 20-30 data-points under 100% WOT to match any mods you've done like exhaust, high-comp pistons, cams, larger-valves and porting, etc. You need a wideband O2-sensor with datalogging to record your AFR as you ride. A gauge or instantaneous display is not useful and can actually be very dangerous as it distracts you while you're doing 5th-gear full-throttle runs to redline. I like the TechEdge line of sensors from OZ because they are fully-digital (many on market are hybrid digital/analogue, not as accurate), and it has on-boad memory to datalog up to 30-minutes of data without needing a PC connected.
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Old December 9th, 2017, 01:10 PM   #5
DannoXYZ
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You can also buy a wideband from DynoJet that ties into their Power Commander and gives you auto-tuning and datalogging features (still need laptop hooked up). At which point, you're right back to same functionality as factory system with O2-sensor hooked up. Well, you can now adjust and save WOT maps.

http://www.powercommander.com/powerc..._autotune.aspx

Last futzed with by DannoXYZ; December 9th, 2017 at 02:39 PM.
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