AudiForYou's 2.7T

I had the car dynoed again today. This time boost and air-fuel ratio was measured.

First graph shows HP and torque, second graph shows boost and air-fuel ratio.

<img src="http://pictureposter.audiworld.com/66538/dyno_1.jpg">

<img src="http://pictureposter.audiworld.com/66538/dyno_2.jpg">

See that huge spike in the air-fuel ratio at 3500 RPM, around 18 parts air for 1 part fuel? That's a lot! On another run it spiked all the way up to 22. That's dangerously high, as far as I know...
What's up with that?

It's not a misfire, because there is no power dip in the first graph.

The ratio was measured at the exhaust pipe. I don't think there anything pumping oxygen into the exhaust when the car is fully warmed up, is there?

So I think the ECU programming is to blame.

Any experiences or comments? Suggestions? Thanks.

ErikS4

What injectors?

ErikS4

Reading your sig - no mention of injectors - I'd say that's the problem. Just a 5-bar won't cut it.

nyet

got any logs?

rktskicar

have a true 5 bar FPR (not crushed 4 bar).?

Bruce

AudiForYou's 2.7T

According to GIAC, stage 3- chip is designed for stock injectors. Maybe they're just clogged?

AudiForYou's 2.7T

Yes, it's a real 5 bar, from AWE Tuning

addìct

If that's wheel horsepower, that's really optimistic

AudiForYou's 2.7T

Why? 289 whp seems about right. It was optimistic at waterfest last year when it measured 325 whp.

rktskicar

<center><img src="http://pictureposter.audiworld.com/44443/asp_stage_3_vs_giac_3-_vs_giac-x_vs_stock_0_031407-adj.jpg"></center><p>