ATKS4

I've been STFA for a while now and think I may have figured out what the problem is, but figured I would ask anyways to be sure.

Symptoms are:
1. tail pipes getting a little too black for comfort and exhaust has faint fuel smell == Rich
2. My *** dyno started noticing that power seemed to be missing too, not hitting til higher RPMs
3. Did some logging on a couple of occasions, highlights of which are below. It seems to hit right when I request a spike, but it's a roller coaster ride when cruising.

<img src="http://pictureposter.audiworld.com/122076/pull_1.jpg">
<img src="http://pictureposter.audiworld.com/122076/pull_1_extended_range.jpg">
<img src="http://pictureposter.audiworld.com/122076/pull_2_extended_range.jpg">

Throwing only one code == intermittent clutch switch, don't think it could be related, but will be replacing soon.

I tested for boost leak == none.
MAF's seem ok,
not sure on Load cycles though because of a lack of data points for those.

My thoughts are that it is the DV's gone bad. I replaced them with 710n's less than a year ago though. So what does AW think? Is there something I'm overlooking?

TheTodd

Are you still stock, except for piggies? That looks like a normal stock boost curve to me.

Can you explain the symptoms a little more?

TwentyValveB5+S4

do a few runs where you start at different RPMs and get on the throttle in different ways (i.e. ease into it a couple times, mash on it a couple)

what chip are you running?

TwentyValveB5+S4

look at his 2nd two logs... low boost aside from two spikes

TheTodd

Those second two are part throttle and graphed against time, not RPM, and he didn't subtract ambient pressure.

ATKS4

I'll do some logs later today and post em.

ATKS4

either way, it's showing improper response when crusing, unless it's supposed to be like that?

Oh, and sorry I didn't subtract ambient, figured people knew it was in there so no big deal, will do full conversion to psi and gauge readings next log.

DocSlowMiniPerson

By low boost, you mean no boost...right? That is atmospheric pressure... ;-)