I thought I had fixed my stumbling problem a while back but it came back a few days later. A few days ago it was worse than it has ever been. Not just stumbling at the top end but I was hitting a brick wall under any hard acceleration. I've been putting off working on it cause I've been kinda busy with other stuff but the final straw happened the other day when I had a chance to run a 911 and a C4 vette at the same time but as soon as I got on it I bogged badly. That pissed me off
So last night tore apart the whole intake sytem from the throttle body to the turbo. Checked the AFM and TPS with a multimeter and everything checked out. Cleaned all the connectors, AFM, and TB. Opened up the TPS and cleaned the contacts. Cleaned the ECU connectors again. On my grainger boost controller, I shortened the signal line and turned the boost down a little. I wanted to run it at less than 10psi until I got things straightened out.
Took it out for a run after I was done and imediately the car pulled very strong under WOT. I was like holy s**t this pulls harder than it's ever pulled. How can this be if I turned the boost down? Did another run and watched the boost gauge. No wonder it pulled harder. Boost was at 14psi . Could just shortening the signal line increase boost like that or is it just cause the car is running better now (this was at 12:30am BTW so the air was cool)? It doesn't really matter though cause this car ROCKS at 14psi so I'm gonna leave like that for a while