juanjuan07

Hi, i have a 2001 WS6 A4 with bolts on and a small cam( 212/218). Right now my A/R ratio is set between 12.2 and 12.3 at WOT, i wanted to know what gains in rwhp and tq can i see if I increased to 12.7-12.8?
The car made 352rwhp and 355tq
I live at sea level.
And also wanted to know if it is SAFE to run at 12.7-12.8 since this is my DD car.

ZTwentyAteU

iTrader: (12)

If it was in between 12.8 and 13.0 with the right timing you could see 20 more horses give or take. 12.2 is rich for NA

macca_779

You wont see 20hp difference. Anywhere between 12.2 and 12.8 doesn't change much at all. I find a lot of A4's prefer around 12.2 so you can screw in more timing. Timing makes a far greater difference in power than a difference in AFR from 12.2-12.8

Black02SS

iTrader: (36)

Not going to happen. Only way the car would pick up 20hp is if the AFR was 12.2 and timing at like 10*. I would say you would see between 2-5hp TOPS with just the AFR being adjusted.

WeathermanShawn

iTrader: (1)

Sure it is 'safe' to run at 12.7-12.8 AFR. You just have to be more diligent at monitoring your timing and any knock as you start creeping up to 13.0 AFR.

I am with the majority of the other posters. The HP gain may not be that dramatic. You can either SOTP or dyno to find your own sweet spot. Sometimes these cars like that 12.2 12.5 range, others find a crisper acceleration going to 13.0.

Probably dependent on your overall cylinder pressure. You can gain that from timing or additional CR. I usually end up around 12.5-12.7 AFR. If you can get all that fuel to 'burn'..sounds like the recipe for power.

..WeathermanShawn..

shoemike

iTrader: (25)

Do you fill up with 100% gas or E10?
Ethanol vs Gas Stoich.xls

juanjuan07

91 octane gas