Optimal A/F Ratio - 600RR.net
Exhaust & Fuel Delivery Tips on how to get the most out of your bike

 
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post #1 of 14 (permalink) Old 07-02-2009, 05:33 AM Thread Starter
 
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Optimal A/F Ratio

guys -

would you mind sharing the current Air Fuel Ratio you are running? please let us know if you have any power enhancing mods.

the point of this is to have a colection of data points that could be useful to someone else. for example i have a bazzaz autotuner but not dyno in a 12h driving range so unfortunately I don't know what the best a/f mix is.

i'm currently running 13.2 - stock motor, gutted air intakes and full arrow exhaust.

thanks

Last edited by bpopovic; 07-02-2009 at 05:44 AM.
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post #2 of 14 (permalink) Old 07-15-2009, 02:59 AM
 
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Then you're sweet. Have fun
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post #3 of 14 (permalink) Old 07-23-2009, 12:05 AM
 
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I try to keep mine 14.7AFR till I get to 80% TPS.
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post #4 of 14 (permalink) Old 07-26-2009, 04:52 PM
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I have the bazzaz with a full exhaust and race filter, I set the self-map to 12.9 but lately I've been experimenting with manually going leaner towards 13.2 below 50% throttle/10k rpm which seems to help response.

Also all the way along the bottom row (0% throttle) for the track I put in +10% fuel so that there's already fuel ready in the intake air when you roll on the throttle.

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post #5 of 14 (permalink) Old 07-26-2009, 04:56 PM
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Def interested in this also.. Running the new PCV with autotuner and Im only running what it came programmed in right now. It was like 13.4 in the lower range and 13.2 in higher RPMs but def want to change it.

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post #6 of 14 (permalink) Old 07-30-2009, 08:34 PM Thread Starter
 
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Then you're sweet. Have fun
birdman - i know you have quite a bit of experience with dynos. what's the average you've been using ?
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post #7 of 14 (permalink) Old 07-30-2009, 08:54 PM
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How do you like the map you have bpopovic? Ive got the same set up as you but no custom map. If you like yours do you mind sharing it?

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post #8 of 14 (permalink) Old 08-23-2009, 11:36 AM Thread Starter
 
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How do you like the map you have bpopovic? Ive got the same set up as you but no custom map. If you like yours do you mind sharing it?
i like it quite well. I have a new map now, been using the autotune on a few different tracks and have got pretty good one. uses a/f mix of 13.2. But again I don't know if this is the optimum point where a/f shoud be at.

you have a PM thoroughbred
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post #9 of 14 (permalink) Old 09-18-2009, 03:01 AM
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i've set up mine at 13.0 but next time i'll be on the track i'll try to set it up at 13.2 above 12500rpm.i asked a mechanic at last months race and he runs 12.9-13.2

bpopovic can i have a look at your map?

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post #10 of 14 (permalink) Old 09-20-2009, 02:56 PM Thread Starter
 
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Originally Posted by nikosrr View Post
i've set up mine at 13.0 but next time i'll be on the track i'll try to set it up at 13.2 above 12500rpm.i asked a mechanic at last months race and he runs 12.9-13.2

bpopovic can i have a look at your map?
you have PM
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post #11 of 14 (permalink) Old 09-20-2009, 03:26 PM
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Im in the same boat with the bazzaz unit. running 13.2 across the whole map. don't know what optimal and where to make changes. any ideas
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post #12 of 14 (permalink) Old 10-06-2009, 01:36 AM
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ya....any help would b appreciated....installed my bazzaz n self mapper buy am totally lost with this stuff. i can work on sophisticated aircraft but am lost to this bike......HELP!!!!
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post #13 of 14 (permalink) Old 10-06-2009, 09:08 PM
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you can run leaner in the lower rpm's such as 14.7 at idle and around 14.0 in the very low rpm's, but when you get into the mid range start getting to or at 12.8 throuch 13.2

I wouldn't recommend 14.7 on much of anything over idle though. remember that is a good afr ONLY when there is no load at all on the engine. The minute you start revving it your load on the engine is going up. To play it safe I would recommend (and bazzaz does) 13.0 or 13.2 across the entire area for safety of the engine and horsepower. We are Bazzaz's largest dealer and deal with them very closely. If you guys have any other questions just post up...

12.8 through 13.2 is where you want to be with a load on the engine if you're after safety and horsepower. That is unless you have engine mods or run race gas and then you probably know what you're doing and don't need to read this anyway.
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post #14 of 14 (permalink) Old 10-13-2009, 01:14 PM Thread Starter
 
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after a few good months of research and by speaking with British SuperBike and Ten Kate mechanics it looks like for super stock bikes the best A/F Mix is indeed 13.2.

Some run it a little richer in the low end and a tad leaner in the high rpm for more hp.

As motomummy is saying this is for relatively stock bikes - like World Super Stock 600 bikes (that have no signifcant change in compresion, piston heads, valves).

Enjoy
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