Bored....some boost, MAF, and injector time data

Reply Subscribe

Thread Tools

Search this Thread

Aug 31, 2003 | 08:23 PM

RobC

Thread Starter

AudiWorld Super User

Joined: Mar 2000

Posts: 2,867

Likes: 5

From: Duluth, GA

Bored....some boost, MAF, and injector time data

I'm not going to put the plots up, but I thought some of you might like some data points. Did a few pulls tonight to diagnose a "whooshing" sound that I get at about 3500 RPM. I'm running XR chip with Autospeed DP and MTM exhaust with stock filter. Temp tonight was 78 degF and 87% RH. The sound makes me think some sort of intake leak, and I haven't hooked up the intake pressure tester yet (that's the next step). There are no spikes in the actual boost curves, but it sure seems like the BPV's are leaking at full boost. But I swapped out my 710N's with new ones with the same result. So now I've got a spare set

.

On several full throttle pulls I'm peaking at about 22psi from 3200-4000 RPM. The MAF rates are sorta low maxing out at 250 g/s. My mean injection time is peaking at about 23.5 ms. I've got an ITG cone filter and am thinking about some DIY plumbing to mount it in the air box, a la S-Flo to help bring my MAF rates up.

The stock K03's are holding in there. I've been running XR exclusively for probably the last 10,000 miles now with a couple of track days and several nights at the drag strip. I'm not trying to kill the turbos, but I won't be upset if they let go because I just want an excuse to upgrade to stage 3.

Comments welcome.