Hi folks. Posting on behalf of a mate. Fitted a replacement engine into his Saph but it is making zero boost. Stage 3 spec on a t34.48. We have tried the following:

3 different good turbos.....the t34.48, a t38 and a standard t3
2 amal valves and running it without
3 different MAP sensors, 2 are brand new
Blanking dump valve off
Plugged in L8 and L6 Ecus

The car has a brand new loom so in theory the wiring side should be fine

All boost hoses are new and tight

The engine runs fine, just makes zero boost. Piped a boost gauge in and it goes to -0.8 at idle and 0 under load

Any help or ideas would be appreciated

Cheers, Wayne

 

Did all 3 turbos have there own wastegates and actuators? Also is there a bleed valve in the system?

 

Yes they all had wastegates and actuators, didn't matter which was used, still no change

There isn't a bleed valve as far as I know

 

sounds like something significant, leaking boost pipe perhaps?

 

It does seem to be like when a boost pipe is off, just doesn't build up pressure but all pipes and hoses are new

The intercooler appears to be ok, it's a fairly new one too