What should A/F be at idle and WOT
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idle should be around 14.7 +/- a few. At WOT seen that you are f/i I will be scare to see anything higher than 12. The reason it is leaner at idle/crusing is because you are not producing any load so the motor is in "relax mode". Sorry is the best way I can describe it.
Last edited by MR_X; 01-09-2007 at 05:50 PM.
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Originally Posted by Subrwho
For me, AF jumps all over at idle, cruise is a solid 14.4-14.8, WOT = 11.3ish. How do you have a 500+ HP car and don't know AF ratios??
Plus, I don't tune my own sheit due to V-Pro restrictions.
Thanks.
Last edited by Jokestrap; 01-09-2007 at 05:18 PM.
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The CATS need 14.7 +- 0.5 to function.........outside that narrow range they don't do much........they get washed wet during acceleration from the excess AF used to cool the combustion down [ 14>12>10].
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Originally Posted by Alberto
Boosted? NA? Pump gas? Race gas? Ideal for me...
cruising 14.7
WOT:
NA 12.8-13.3
FI stock block 10.8-11.3
FI built, pump gas 11.0-11.5
On race gas up to 12:1 "lean"
But what do I know?
cruising 14.7
WOT:
NA 12.8-13.3
FI stock block 10.8-11.3
FI built, pump gas 11.0-11.5
On race gas up to 12:1 "lean"
But what do I know?
Alberto, in "A/F" air comes first meaning the higher the first number, the leaner it is. That doesn't seem to be what you are telling me above.
In my sig, boosted 12.5psi, built long block no cams. 93 octane.
Last edited by Jokestrap; 01-10-2007 at 04:31 PM.
#10
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Originally Posted by Jokestrap
Alberto, in "A/F" air comes first meaning the higher the first number, the leaner it is. That doesn't seem to be what you are telling me above.
In my sig, boosted 12.5psi, built long block no cams. 93 octane.
In my sig, boosted 12.5psi, built long block no cams. 93 octane.
He is telling you what the ratio is. So basically dont go any higher than a ratio of 12.1 on race gas.
What is your A/F ratio right now Jokestrap?
Later
Todd
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Originally Posted by aceman
I agree with Alberto
He is telling you what the ratio is. So basically dont go any higher than a ratio of 12.1 on race gas.
What is your A/F ratio right now Jokestrap?
Later
Todd
He is telling you what the ratio is. So basically dont go any higher than a ratio of 12.1 on race gas.
What is your A/F ratio right now Jokestrap?
Later
Todd
Okay, got it. I don't use race gas. Right now I am about 13.5 at idle and about 11.7 at WOT on 93 octane. Seems good to me based on all the threads I have read in the FI section. The reason for the thread is that I really wanted to get direct feedback on the subject instead of scattered comments.
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Originally Posted by Jokestrap
Okay, got it. I don't use race gas. Right now I am about 13.5 at idle and about 11.7 at WOT on 93 octane. Seems good to me based on all the threads I have read in the FI section. The reason for the thread is that I really wanted to get direct feedback on the subject instead of scattered comments.
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Originally Posted by Cannysage
that sounds very conversative, especially on pump gas.
Thanks for the responses guys.
#15
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Originally Posted by Cannysage
I'd say around 15.5 for idle and 12.5 at wot for FI'd engines.
Originally Posted by Cannysage
that sounds very conversative, especially on pump gas.
Last edited by Alberto; 01-12-2007 at 06:08 AM.
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You probably won't pass a measured dyno emission with idle at 15.5 as the Nox goes higher either side of 14.62.
Even the finest $10,000 WIDE BAND O2 systems are not very accurate.
Manfacturers collect all exhaust and subject it to gas chromograph to get the EXACT 14.62
Even the finest $10,000 WIDE BAND O2 systems are not very accurate.
Manfacturers collect all exhaust and subject it to gas chromograph to get the EXACT 14.62
#17
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Originally Posted by Alberto
With as many posts as you have you sure do make uneducated comments man. The comment above is not correct, not 1 tuner on this site would agree with you on that one...
any other peeps want to chime in?
what is a good range that's not too conservative. 15.5 is probably too lean, now I think about it, I'd suspect you can push 12s at wot with an aggressive tune?
#18
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Originally Posted by Cannysage
wow, what a total *****
any other peeps want to chime in?
what is a good range that's not too conservative. 15.5 is probably too lean, now I think about it, I'd suspect you can push 12s at wot with an aggressive tune?
any other peeps want to chime in?
what is a good range that's not too conservative. 15.5 is probably too lean, now I think about it, I'd suspect you can push 12s at wot with an aggressive tune?
#19
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^ gotcha. I'm still NA and running 15.5 @ lower rpm and 14ish at wot. I know this sounds lean, even for NA, but I've talk to several shops in socal and they said it's still within reasonable range. I'd may want run abit lean (but within safe range) when I go FI, because I do a lot of highway driving.
#20
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Originally Posted by Cannysage
^ gotcha. I'm still NA and running 15.5 @ lower rpm and 14ish at wot. I know this sounds lean, even for NA, but I've talk to several shops in socal and they said it's still within reasonable range. I'd may want run abit lean (but within safe range) when I go FI, because I do a lot of highway driving.