Garrett has finally released a GTX version of the 88mm wheel found on the GT40/88R and the GT37/88R turbo. Three years ago Garrett released new compressor wheels for some of its turbo line up. Most of those turbo’s were the larger GT45R and 50R verities. These turbo’s came with all new billet compressor wheels with completely different aero designs. The easiest way to spot these wheels, other than the fact that they are a nice shiny billet, is that most are 11 blade designs. Previous cast wheels in the Garrett line up were mostly 6 blade and 7 blade wheels.
the 30r turbine is a fussy wheel. really bad results when in wrong turbine housings. when in good housings it works really well and will spool faster that 35r turbine. the whole gtx3576 is a better choice than gtx3076 is all based on a couple of really poor back to backs. one on evom of which there was a cat in place with 30 wheel. switch to 35 no cat. buschur made 600whp/600wtq (on his low reading dyno) with hta3076 in his forward facing setup with tial 82.