Nigel (no more S4)

Logging a friends car here, stage 3 using ASPs software/fueling, 85mm MAF, RS4 IC's

baseline o2 prior to tweaks. 2 weeks ago, this car was running rich (over .90). Airbox changes were made (stock instead of Evo), and now the car was showing very lean (low .7x's).

<img src="http://pictureposter.audiworld.com/77913/baselineo2.jpg">

Looks like the primary O2s may be a problem.

However, we added some primary fuel to see if we could get the O2's in good range. +15% primary later, we get

<img src="http://pictureposter.audiworld.com/77913/o2_15pct_primary.jpg">

Looks a little better. Correction factors for the +15 Primary as below

<img src="http://pictureposter.audiworld.com/77913/cf_15pct.jpg">

They look good. Timing was in the upper teens/low 20's.

So, +17pct to try and get those O2's to at least 0.85. And got

<img src="http://pictureposter.audiworld.com/77913/o2_17pct_primary.jpg">

With +15 Primary, the car feels considerably faster on the butt dyno. But, still not right. I'm thinking those primary O2's may be on the way out. Anyone see anything else or have any other thoughts? Even with that much fuel added, the CF's were never above 9, timing in the upper teens. MAF flow is crap (183g/s), but we're at 5500ft doing this. Boost is too low, but Mark@ASP is addressing that in his software.

Hal_TT::CBP

What's a "normal" maf reading on that setup? Low maf = lean. What was it before the tweaks?

Nigel (no more S4)

170's. I've never seen the car above 190.