PC-V w/ Autotune - Optimal A/F ratio - 600RR.net
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post #1 of 8 (permalink) Old 08-16-2009, 06:06 PM Thread Starter
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PC-V w/ Autotune - Optimal A/F ratio

As in the title i have a PC-V w/autotune on my '09. it runs ok but i think it can run better. currently i have whatever stock a/f DynoJet loaded (around 13.2 i think) and the autotune and it's adjusting to that a/f. can someone share with me an optimal a/f chart for the entire throttle range. i think this will really help dial the bike in.
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post #2 of 8 (permalink) Old 08-16-2009, 07:06 PM
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I asked this question once before and no response. Def be interested in what people say. Got the same PCV w/autotune

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post #3 of 8 (permalink) Old 08-17-2009, 05:27 AM
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I have a Bazzaz, but same issue.

Most responders said to get it on a dyno, when I asked the same question. I've been trying to read up on the subject, but most books on electronic engine management cover car engines. In the books one author said that max torque can be made anywhere between 11.5 and 14.5, which isn't much help. Another narrowed it down more to between 12.8 and 13.4. So I think the advise given on this forum is the only way to go, because there is no set number that works the best, although I think 13.0-13.2 is in the ballpark.

My plan is to bring it to the dyno during winter and make some runs starting at 12.8 and going up towards 13.4. I may extend in both directions if power is still increasing, and it's deemed safe to run any leaner. When I overlay the graphs of the different A/Fs I will see which A/F ratio makes the most power across the whole rev band. Then I will start making changes to the ignition timing, trying to squeeze the last couple of horses out of it. I think this will be a good way of doing this, but I will of course listen to the dyno operator, who has more experience in these matters.
Once I have the best A/F, which may be different at low, mid and high revs, I can use the Bazzaz to keep the bike at optimum tune.

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post #4 of 8 (permalink) Old 08-17-2009, 06:59 PM
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The values we put in the target AFR are a really good baseline setting. You will see that most of the maps have the cruise range a bit leaner and this is for fuel mileage. Usually on a dyno you will see the best peak horsepower numbers around 13.4 but this does not always mean the best performance in the real world. We have done a lot of testing with multiple AMA teams and we always end up around 13.1-13.3.

There is 1 top level team that always asks us to map their bikes at 13.4 up to 40%, 13.3 up to 60% and 13.1 up to 100% and they finish on the box most weekends.
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post #5 of 8 (permalink) Old 08-18-2009, 07:18 AM
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Good to see specific numbers from someone in the know! Thanks!

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post #6 of 8 (permalink) Old 08-19-2009, 03:13 AM Thread Starter
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DJ, thanks for the reply.. i guess i'll just leave the A/F as is. but i still need to do something cause i get some really crazy numbers in my map sometimes......
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post #7 of 8 (permalink) Old 08-19-2009, 01:08 PM
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The only reason to get high values are:
Clean air not blocked
Exhaust leak
Poor placement of the O2 sensor- too close to muffler exit causing reversion
Bad O2 sensor

Send me a copy of your map and I'll see if it tells me anything.
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post #8 of 8 (permalink) Old 08-21-2009, 03:18 PM
 
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Always try to get mine between 12.8 and 13.0.

The saying always goes leaner is meaner, but don't want it to run too lean.
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