Hi

I have the factory Subaru Performance Guage Pack in my WRX. With the electric on, but not the engine, my boost guage needle sits at -.01 MPa. When I'm driving, and I "punch" it hard, the needle maxs out at +.1 MPa. My questions are as follows:

1) At rest, with no engine running, shouldn't my boost needle be at 0 MPa? Is my guage not calibrated properly?

2) Does the fact that I can only achieve +.1 MPa indicate that my factory turbo is not performing properly? It was my understanding that I should be getting about +.14 MPa instead of the +.11 that I get (assuming I allow for the -.01 from the start).

So am I misinterpreting this stuff, or is either the boost guage or turbo incorrect?

Thanks for the help.

 

1) Yes, the guage should read zero. The guage is probably not calibrated very well. I don't have that guage, nor have I seen it, but perhaps you can re-zero the thing.

2) .1MPa = 14.5psi, that's where you should be with the stock turbo. .14MPa = 20.3psi you don't want that much boost

Whatley

 

What he's saying is withOUT the engine running he has -.01MPa. When the engine isn't running, he should have 0 boost. Sure, at an Idle it should be in vacuum, but not when the engine isn't running.

Whatley

 

Thanks guys.

I don't care so much about the guage being calibrated wrong, so much as I was worried I wasn't getting the full boost.

Didn't realize that +.1 MPa meant 14.5 psi. I didn't know how to do that conversion.

Thanks again.

 

I've heard of this issue with the factory gauge before. Might whine to the dealer, see if you can't get a free replacement. Maybe the next one will work, maybe it won't

Whatley