A/F ratio...where should our cars be?

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Old 11-08-2007, 03:26 PM
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Burning Brakes
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A/F ratio...where should our cars be?

Just curious...

I'm seeing a pretty linear curve around 13-13.5 with a decrease to 11.75-12 at 5.5-7k RPM. Just want to make sure that's within safe operation limits .
Old 11-08-2007, 03:33 PM
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you're running a bit rich.. but thats ok.. just don't run lean..
Old 11-08-2007, 03:46 PM
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when i'm in boost my a/f ratio is at 10.0
normal driving it's around 14.0-14.5

i drive an '04
Old 11-08-2007, 03:50 PM
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looks like some one went to the dyno......where are the results?!?!?!?!

COME ON!!!!!!!!!!!!....lol
Old 11-08-2007, 04:03 PM
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Originally Posted by CL9er
you're running a bit rich.. but thats ok.. just don't run lean..
Yeah, I figured I was. I was going to add a water/methanol injection kit sometime soon, but that would make me run even more rich (by about a 1/2 point). I wonder how bad that would be...


Originally Posted by jmatthew34
when i'm in boost my a/f ratio is at 10.0
normal driving it's around 14.0-14.5

i drive an '04
Wow, 10.0 in boost??? That seems pretty rich to me. At max boost I'm hitting 11.75 at minimum (closer to 12).


Originally Posted by jwood_06TSX
looks like some one went to the dyno......where are the results?!?!?!?!

COME ON!!!!!!!!!!!!....lol
Haha, yes I did (finally) go to the dyno. I have the results, but I can't open them yet because my work comp won't let me install the program I need to view the results. Suffice it to say the numbers were good, but not stellar. The guys at ICS say they have a new Dynojet which runs a bit "stingy" by 5-10whp, so I should dyno a bit better elsewhere. I'm also betting that with a water/methanol kit, my numbers will be even better .
Old 11-08-2007, 04:21 PM
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normally you'd wanna run close to stoich... but in boosting applications.. its safer to run a bit rich. 11.75 is pretty good.. although 10.00 on boost.. well thats too rich..
Old 11-08-2007, 05:23 PM
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I'm glad you found out about ICS. I'm going to dyno there before and after my S/C in the spring so that I can do a baseline (I/H/C/E) vs S/C.

I forgot to ask you earlier, what gear did you do those pulls in?
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