Normal A/F Mixture Rate

carguy1985 · 2005-09-19

I have a o/r xpipe and i know my cars most likely running rich, whats the normal air fuel ratio for a car with my mods (mods in sig) so i can adjust it using my lap top and predator. let me know thanks

carguy1985

Discussion Starter · #3 · Sep 20, 2005

Ok going to use my friends lap top to determine my a/f mixture. I can adjust it from 204K and 4-7K with my predator how should i set it to to have best performance with my mods...... what numbers should i read?

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carguy1985

Discussion Starter · #6 · Sep 20, 2005

is there anyway to read it with my diablo predator and see what it is at? i know i can change it but i dont know how to see what the A/F ratio is at, i wanna use my friends laptop he has a program that can do dyno runs with laptop and he can see codes and airfuel mix but cant change it, how ever i can change it with my predator to lean it or rich it.
Let me knw

Ill be on look out for my a/f mixture i expect its in 11-lower 12s right now.

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carguy1985

Discussion Starter · #7 · Sep 20, 2005

is there anyway to read it with my diablo predator and see what it is at? i know i can change it but i dont know how to see what the A/F ratio is at, i wanna use my friends laptop he has a program that can do dyno runs with laptop and he can see codes and airfuel mix but cant change it, how ever i can change it with my predator to lean it or rich it.
Let me knw

Ill be on look out for my a/f mixture i expect its in 11-lower 12s right now.

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carguy1985

Discussion Starter · #10 · Sep 20, 2005

My friends laptop has a prog to check all cars parameters it can check pretty much everything for you but you cant modify it. Now.. i can with my predator so i think me and him are going for a drive around back roads to see where i am at.....

were can i get a Wideband A/F Ratio sensor?

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carguy1985

Discussion Starter · #13 · Sep 22, 2005

You leaned it out without actual guages and monitoring... thats kinda like guessing in a way. I am going to use my buddies lap top and tune iwth my predator... i think its the best way to go and then next track meet ill see whathappens..... of course ill be running gears then =)

Twitch said:
Just came back from the track tonight. Since I did my dyno run, I saw taht my A/F ratio is around 12:1 - 11:1 which is rich. The mechanic suggested me to lean out about 5%, but too be safe since I have no A/F ratio sensor, I leaned out 2k-4k by 1.5% and 4k-6K by 3%.

After 10 runs, I couldn't do ANYTHING under 14.0xx, my best trap time was 102.8mph.

After I reseted to original Predator settings and ran again. First run, 13.984, second run, 13.875, then third run 13.873 and my trap speed improved too. My best of the night was 103.273

So I dunno what's happening, maybe my A/F ratio at the dyno was off.

My mods are:
- Mac ProChamber O/R
- Diablosport Predator
- Granatelli Intake Plenum
- Ghetto CAI:tongue

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carguy1985

Discussion Starter · #15 · Sep 22, 2005

Yea i know we are going to go through some gears =) on the back roads. 1,2,3 through WOT. because i can adjust 2-4K and 4-7K

So thats cool.

Monkey Boy said:
You've got to remember that when the engine is under a heavy load it likes a richer A/F ratio. At the track and at the dyno you are running at full throttle and the engine wants more fuel. During normal driving conditions, the engine prefers a higher A/F and the computer will lean the mixture out.

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