I switched to a Carberry rom (speed density) about a month ago, and I'm finally getting my ass around to fixing up the tune and everything. The AFR's are... getting there :P
Anyway, I did some mechanical stuff too at the same time, and I'm pretty sure the issues I'm hitting now are mechanical, so I'm posting here rather than in the tuning forum.
I've been driving my own little tuning route, that includes a situation where I have to do a 0-60 pull to get onto a highway. Just about every time hitting this spot, something strange happens.
I pull all the way through first, as close to redline as I care to go, then go for second and get straight on it again. When this happens, often times, I'll be around 4krpm, WOT, and the car makes a strange fluttering noise (sounds like either air or exhaust - kind of like the wastegate, but different enough that I'm not sure it is, pulsating on and off pretty fast), and I won't accelerate much, if at all. If I clutch in, let the rpm drop to idle, then get on it in second again, it takes right off like it should.
This is the only situation I've seen it in, and it doesn't happen every time (but it does happen most times) - it seems like it happens less often if I give it a tiny bit more time for the rpm to drop before clutching out.
My WGDC's have been hitting the maximums, and I'm not getting quite the boost that I'm targeting.
Here's a log of my doing a first gear pull, then dropping into second, hitting the issue, clutching in to drop it down to idle, and getting off the clutch to finish the pull: http://ompldr.org/vZW45Yg/romraiderl...704_112631.csv.
I'm really not sure what this is at all, my thoughts range from my BPV failing to a boost leak that springs itself wide open occasionally, to the wastegate arm being maladjusted... any ideas on what's wrong with my car?