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dap930 dap930 is offline
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Join Date: Dec 2011
Location: Virginia Beach, VA
Posts: 323
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I believe the GT30R exhaust housing is too small for 3.4L engine. It is a very good fit for a 3.0L. My GTX7130R makes 1.2 bar at 3000 to 3200 rpm. The GTX7130R flows about the same as a GT7630R. He is using a GTX7630R, the compressor flows about the same as GT3583R, but I read some stuff on the internet that people found the 30R turbine housing to small to power the GTX76 compressor.
Once they have EBC setup, I think they will find that exhaust back pressure will push the wastegate further open at high RPM's dropping boost pressure. To keep boost from dropping, I had to add more DC to my wastegate solenoid to offset the increase in back pressure in the 5500 - 6500RPM range in the coarse of EBC tuning.
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-Dennis
1977 930 Slant, MS3 EFI, Carrera intake, Twin plug, Powerhaus headers, Magnaflow muffler, Garretson intercooler, GTX3071R
Old 06-01-2016, 10:40 AM
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