Scene;
Driving on motorway at fd motorway speeds, 70% throttle, and \'pop\' like a back fire pop and turbo pressure drops down from 0.9bar max to 0.4bar and won\'t go any higher.
Also with loud whistling/hissing sound from turbo/dump valve area of engine whenever in +ve pressure
First thought was that turbos has gone bang, so limped it home.
Confusion;
Been out for couple of short drives since.
- Car idles like normal 0.9k - 1k rpm no problem
- Pulls away no problem
- Drives no problem
- No smoke at all from exhaust (straight thru)
- No bad smells
- No oil leaking
- Oil level not gone down at all
Only difference is can only get 0.4bar out of turbos, loud whistling/hissing sound and no dump valve.
All things lead to popped pipe in my opinion, no obvious pipes have come off but i need to check properly.
Just wanted outside opinions and recommendations from proper rotary guys.
Running;
Apexi intake,
HKS twin turbo pack (sequential)
HKS dump valve
Mapped to 0.9bar boost max
Start with the basics, remove and refit all the intake pipework from the turbo to the throttle body.