I just recently installed my WB AFR gauge and noticed that when I go WOT after about 4500 rpm in 3rd gear the car goes suprisingly rich.

At WOT in first and second, when I hit PE, I'm pulling a 13.3 - 13.6 then when I hit 3rd it flys to 11.5 - 12.2 ...wtf.??

Is that normal for N/A?

 

sounds like some factory tunage to me...

people do say that GM runs very rich tunes...

 

Indeed this is true but...in first and second gear the tune is fine.

It's just 3rd that it starts running pig rich.

I can change it of course with my FIC but I was just curious if anyone had any opinions?

 

that seems to me like your getting leaner, higher afr = leaner

which would make a lot more sense

 

Ummm I think you miss read that.

 

if you would read right hes running 13.3-13.5 in first n second, when he is in third hes getting 11.5-12.2 thats richer.

 

reading>me i thought you where saying that in third you where seeing 13.3-13.5 i was like wtf?


easy tiger, my mistake. =)

 

No worries.

Anyone know if this is bad for my N/A setup? or will it not hurt for now?

 

I was just saying haha

 

its not going to hurt, its not like you are running dangerously rich

you are leaving some untapped power on the board though from running that rich N/A

if you were running 13.0 - 13.3 AFR at WOT across the table you'd be good

 

Time to pull some fuel up top then

 

i know my car had a delay of 10 seconds before PE would kick in at WOT

 

its probably COT protection coming on. do you have a cat on the car?

 

I have a fully legal exhaust.

I just did emissions this sat and passed without trouble.

 

sounds like COT to me.

 

I'm sorry but what does COT stand for?

I'm still learning tuning and the terms.

 

COT = catalyst over-temperature protection

 

Well who knows why it's richening up the mix, but I will hook up my FIC and lean it back down with a little trimming.

We'll see then.

Thanks guys.

 

Do the SS/NA have piston protection on them? If so, see if it is set for like 4500 or so maybe that is what is doing it.. either that or I would agree it is probably COT.

 

So if I'm getting COT then does that mean I should leave the AFR where it is or ...? Cause I dont' want to kill my brand new cat.