93.5 Auto w/ 51k. Turbos replaced @ 40k. Just purchased the car and it won't build past 13lbs. Has Blitz DSBC, Blitz BOV, RMM DP, Blitz Nur Spec. Have tried TTC, bypassing boost controller. etc etc and it doesnt' change anything. Any ideas please post.
Does the car have a Greddy BCC or HKS FCD installed? If not go get a Greddy BCC... the Supras peak boost is limited to 13-14psi... generally it can hit 14 for a VERY brief amount of time before fuel cut is reached... That could very well be the problem.. maybe the original owner didnt have the smarts to pick one of those up as his first mod
It doesn't hit boost cut, it just won't build boost. It will only build like 5psi in first, 10 psi in second, and then about 13.5psi in 3rd. Also, the car will not build any boost by brake boosting, and it won't even powerbrake because it doesn't make enough power since it won't make ANY boost by powerbraking!
boost leak will do that , pressurize the system they are real prone to leak in the hoses near the ic. if there is no boost leak, You might not hit fuel cut unless you boost hard in 4 th or 5th gear in a high gear not sure how that works in an auto as it will down shift i suppose. have yo checked the dsbc and turned the boost up?