Sounds like compressor surge. What combo are you running? It usually pops up after switching to a front mount or even an oversized stock location intercooler. You may be able to tune some of it out, but for the most part people tend to change their driving habits. Do a search on compressor surge, lots of people out there with the same problem.wahoo50 said:After further investigation, it starts fluttering about 5 lbs. boost, guage does start rapidly bouncing. Fluttering and guage bounce stops at 10 lbs. boost. Ideas anyone? Problem not caused by exhaust bolt being broken.
gnx139 said:Dude, you got the SURGE! I got it after putting on the PTE S.L.I.C. It sucks and I hate it. If there is a way to tune it out, someone please tell me. I will be putting on the GT3255E and see if that helps. Car now has a TA48 which is the predecessor to the 49. Mine does the same thing at 5psi at part throttle.
gnx139 said:The boost actually bleeds out and the car stumbles. It will not maintain boost at 5psi or under unless you put the accelerator into it more. It does not like part throttle boost for some reason. I can only guess that the large amount of air in the large IC over pressurizes the compressor and forces the air back out unless the compressor is pushed past the volume in the IC. That is how the SURGE was explained to me.
gnx139 said:Stock original MAF, I put on one of the reman-Delco units from the dealership and same thing.