I have a 98 TA A4 with lid, home ported TB, grinded out TB nub, smooth bellow, stock exhaust to a dynomouth catback with no muffler and 3.5 tips. What is the perfect A/F ratio.

Tim

I was told 13.2:1

 

12.9 - 13.1 on motor.. This is the auto industry standard.. 12.9 for tq and 13.1 for hp.

Ofcourse you will hear numbers all over the place

 

That's for peak power, right?

I thought for best fuel economy it was 14.7:1, correct me if I'm wrong...

I've also heard that the "perfect" a/f ratio for completely burning all the gasoline is even higher, but it's too hard to ignite the mixture at a perfect ratio.

Running rich would be best for power, though, since the mixture is going through to fast to properly mix, so it's gotta run rich for all the o2 to burn...

 

yeah ours cars try and run 14.7 at idle and cruise all the time.

 

I'm at 12:1 at WOT.

 

High 12's to 13:1 for making power. If you want to be on the safe side too stick to the 12.5:1 range.

 

that should help

 

Youre not NA