Hi guys. Just as the title says, I've got an RB25DET in my R32 and whatever I do, the boost will NOT stay steady.
The motor is 100% standard. Standard turbo, intercooler, dump pipe, blow of valve, everything.
I have tried a few configurations though and nothing makes any difference. Have tried an RB20 actuator, t piece boost controller, aftermarket dump pipe and just recently a brand new GReddy Profec B Spec 2.
So like I said, even with stock parts, the boost level to 4000rpm will stay steady at 4.5ish psi, then gradually climb to about 8.5psi by redline.
It does it in every gear, although I found if you launch hard in 1st then the boost stays down a bit for some reason.. Whereas if you're on the freeway in 3rd or 4th then it will climb more noticeably.
I have checked the wastegate flap and moves very freely and does not get stuck at all.
What the hell is the problem?!