No boost after 4500RPM
 

Hello,

The car regarding this problem is a '96 RX-7 Chuki with 178K km on it or 110K miles that I've imported a few months ago.

As the title says, I have 0.69bar boost but as soon as the secondary turbo has to spin at 4500rpm, the boost just drops to 0 and never comes up again.

Also, I've noticed that the bottom of my engine is all greasy and the turbo has some tiny oil splats on it, aswell as the intercooler.

All the hoses in the rat's nest have been changed to blue aftermarket hoses.

Any ideas?

https://cimg1.ibsrv.net/gimg/www.rx7...49bb058232.jpg

Thanks

check the couplers on all the turbo charge pipes, particularly the one right off the Y pipe.

alright will do! you reckon there's one that needs to be replaced or one that's loose?

they tend to rip after so many years of use.

Going to check it tomorrow and I'll keep you posted, thanks for your reply!

checked the couplers on all pipes, they seemed ok, any other idea?

you could have a shop perform a fog/smoke test, to comepletely rule out boost leaks, then its time to check the turbo shaftplay.

a quick visual inspection of the couplers usually won't cut it, sometimes removing the Y pipe coupler will show a tear on the backside.

There is no coupler inbetween the y-pipe and the crossover tube, it's attached like this:
https://cimg0.ibsrv.net/gimg/www.rx7...ab7a657ae0.jpg

is it expensive to get it fixed? or can you easely do it yourself?

Twin Turbo Diag.
Troubleshooting

Thanks alot, I'll go check it and go through it step by step.

oops, i missed that you have the late model crossover pipe.

Yeah I forgot to mention that sorry my bad! Anything else it might be?