I have this problem wher when boost reaches around 13psi the turbo seems to stall really badly, which makes the engine jerk quite a bit and unsettles the car. The stalling generally results in a lose of boost as well obviously.
However, I feel that it isn't true on boost surge for two reasons, 13 psi is not much more than standard vx boost level and if plant my foot wide open throttle then it doesn't do it at all.
I've done a lot of experimenting with the recirculation valve and replaced so many vacuum lines and I've tried running without the inlet BCS to rule that out. I've also ran a electronic boost controller to rule out the turbo BCS and still the same issue is present.
I know at stage4 the power becomes very on/off but it never used to feel like this and it seems to me that something is wrong. Even running at 14psi which much be like stage 2 tune levels the flutter is so terrible and makes for a horrible drive.
I did a long drive on the motorway last night and pulling out into the outside lane to takeover (in 5th) with very gradual thottle just results in a massive flutter and the car like bogging down and feeling really rough. The issue is present in all hears though at the same level of boost
I have experimented with the spring in the forge DV to which seems to not affect said fluttering at all. I've even run with the red spring and have the same problems.
Is there other things that can cause this to happen?? Maf or anything like that cause problems like this? I've had turbo cars before and never had this kind of problem.
Edited by james4563, 11 November 2017 - 11:13 AM.