after reading countless posts about secondary turbo boosting faults i primarily thought i jad a vacum fault due to the secone turbo dumping boost. After visiting re worx they identifed i needed a new vacum solenoid pack which i replaced, unfortunately this didnt fix the problem.
After going out tonight i have realised that the car will switch over on to the second turbo in any gear from below 4.5k. But if i lift off the throttle and re apply ie when changing gear above 4.5k then it dumps boost. So say im in 3rd doing 30 and go wot the car will boost up to .8 bar and hold, then at 8k i change into 4th so the revs drop to around 6k and i re apply the throttle all i get is 0 boost and a dawwww sound when i lift back off. Like i say i dont think its a vacum fault as the secondary turbo woildnt be coming on. Any help would be fantastic pleasas i really want it sorted for japfest.
Sounds like check valve going into the plastic box at the front next to te alternator has become 2 way
nope already checked it by pressurising the vacum chamber with the check value in and it didnt leak any bhp. Also if that was the case then there wouldnt be any vacum to bring on the secondary turbo.
are you running stock ECU ?
i have an apexi pfc with a commander although i havent changed anything as far as im aware of since i bought it 2 months ago and he never had a problem.
apologies for my poor spelling but im using my phone lol, also i meant to put japshow rather than japfest.
i had this problem. pulls a treat up to 4.5k, change up, WOT, car goes to 0psi and when you come off the throttle u get a loud "BAAWWWW" pressure drop kinda noise coming back through the induction system.
i changed the check valve between pressure chamber and the Y-pipe. problem solved.
http://www.rx7guru.com/images/rx7vacuum_hose_diagram.jpg
i\'ve heard this can also be caused by a leaky vacuum chamber. when u re-apply the throttle after "the boing" noise, does the car boost properly again? and does your car sometimes feel hesitant when the second turbo should kick in at 4.5k ish?
i have checked both of them and neither are faulty, iv been told its more than likely to be my turbo control solenoid.