Ok so. I made a vid of my wastegate whilst driving the car and making it flutter. The wastegate did not move at all during the fluttering. So i was dong some more thinking. I think the turbo is producing boost earlier than required. My boost guage is hooked up to my manifold so i was thinking off hooking it up pre throttle to check what is happening during the flutter.
I was doing some reading on here the other night and found this from way back that supports my idea.
Quote:
Originally Posted by jungleboy
A BOV prevents compressor surge on shifts. You can get surge at lower rpm when you make too much boost too early. Usually you need to be in 4th or higher to build enough boost that early.
This can be tuned out easily. Just need to lower the target boost and WGDC values at the rpms where the turbo surges. If you requested this specifically it can be done in a verso tune.
If you log manifold pressure during surge it looks like a saw tooth as it spikes up and down and then flattens out once the engine starts to flow a bit more. |
Hoepfully this is it.