So I've got the turbo from the Greddy GSR kit to go on my car in a few weeks. I was told that the previous owner set the boost to 10psi rather than the 7.8 that Greddy sets it to. How do I go about turning it back down to around 7psi? Do I turn the bolt on the wastegate actuator arm?

Also, most turbos that I've seen with internal wastegates connect the vacuum line off the wastegate actuator to a barb on the compressor outlet. My turbo doesn't have said fitting on the compressor. Where do I connect the vacuum line? Any source off the intake manifold?

Thanks.

 

For the actuator, find a vac source on the intake mani.

as for the boost, maybe the previous owner had a boost controller, or he did some funky actuator fancy smancy work....Ask him HOW he got it to boost 10, and then you'll know from there.

 

To reduce the boost you want to lengthen the actuator arm. If you have a bolt on the arm, you want to turn it so the arm gets longer.

See my other post on where you get the boost source.

Randy