Quick question

[goodie]

My mate has a 180sx, stock bar t28 and fmic. has a manual BC, is it normal for a fuked mbc for the turbo to cut out at 5500rpm running 7-8psi? or could it be related to vacuum leak, stock afm?? seemed only to do it in first gear.

[kurbn]

not sure what pressure the factory wastegate opens on a 180 but 8psi is probably it. Sounds like the boost controller is not doing its job and the actuator is getting a correct pressure reading. Either adjust the BC or replace it if you have no sucess

but if you have a decent enough vac leak you will be bleeding boost off.. if your 100% that there is no leak then I would be pointing at the BC