Ok I have a rebuilt motor thats been balanced and has liquid forgies and a mild cam. I boosted it but am a little unsure of whether it is behaving properly or if I have a problem. It is a manual and runs a recoed T03 foot to the floor in second boosts to 14 psi quickly then slowly drops away and by the time I am red lining I am down to 7 psi yet in 3rd gear it seems to hold much better but still dropping to around 11 psi is that just normal with a bleed valve? what can I do to solve with problem??

please help

sounds like your wastegate is not holding boost i had the same problem its a common problem with internally gated turbos should nt cost much to fix hope this helps dude

Well i wound the Boost controller down a bit. seems to hit roughly the same boost but holds much better but still seem to loose a fair bit as i climb through the revs.

what rpm dose it start falling?

it called boost spike ..waste gate cant hold boost..try crewing your waste gate out abit..it helped with mine..if its scewable!!

mine did the same with a stock accuator on 9psi spike up quick then drop, got a new bigger accuator and hold 13-14psi not a problem

Try getting a boost controller, not a bleed valve type though. turbotech ones, as sold on ebay for about $29 plus postage, Fast 4s did a writeup on them, and the guys on the skyline forums love em to death, aparently cure spike problems, Hold PSI like a rock and bring boost on quicker as well, Im getting one, saw your plight, should only take 15 minues to install too, couldnt be simpler, cut the actuator vaccum line and attach to the controller. Let me know if you get one and how it went, I would almost guarentee it will not only solve your problem, but leave a great big smile on your face from the better boost response at lower RPM. steve. Some original photos have not been recovered yet.