I have a 97 RB25DET Auto Stagea. The engine is completely stadard at mo and its running 4psi boost. I just put a boost tap on yesterday, a real simple one that just bleeds pressure to atmosphere, and wound it up to 10psi. It boosts at 10 then spikes to about 13 just before changing gear, then settles back down to 10 in the next gear. I can hear a fluttering sound coming from the engine bay which I assume is just the tap, but I dont know why its fluttering?? But the main problem is when its doing this the whole car judders as if its trying to break traction, but its not. Its pretty bad and it never did this before, and doesnt do it when i wind the boost back down. Also when it changes into second it looses power. The boost gauge still reads 10 but it definatly doesnt feel like it. And at slow speed there was some pretty funky sounds and clunks coming from what feels like the diff. These also go away when I wind the boost back down.
Anyone know what goin on???