Not trying to hijack your thread, but I'm wondering if you've done any measuring to date? Perhaps used the links I posted?Originally Posted by illumina
I have a GM3 as well and have sperated the compressor side from the center section as well as the exhaust elbow from the exhaust side. My plan is to measures both the turbine and compressor wheel trim as well as the A/R of the compressor side and exhaust housing. Hopefully, then I'll be able to come up with some sort of theoretical compressor map to tell where the turbo is most efficient.