Guess I have been at this tooooo long. A stage 3 50trim describes a T3/T4E hybird that uses the "50 Trim" Garrett Compressor wheel and a T31 or "stage 3" turbine wheel. This has been by far the best selling T3/T4E combo ever.
The 50 trim compressor is the compressor from the very popular FPGreen model and will flow around 49lb/min when maxed out. The cover is 3" in and 2" out. It is generally regarded as the Garrett compressor of choice in the 2.0-2.3 liter 93 octane application when 400-450whp is the target. The 50 Trim T04E compressor is slightly smaller than the one found in our FP3052 turbo which flows about 52-53lb/min when maxed out. So as far a compressors are concerned the 3150 will spool faster/better than the 3052.
The "stage3" turbine wheel is almost the same size as the GT30 turbine wheel but has more blades and is a little more restrictive than the UHP found in the GT30 - making it spool faster and a perfect match for the 50 trim compressor.
So you have basically the worlds most popular T3/T4 pump gas hybrid in a T4 BB chra made by Garrett housed in the bullet-proof 310SS FP30 turbine housing.
Additionally, the T4 ball bearing is larger and stronger than the GT30/35 bearing - so you also get a stronger bearing setup than found even in the GT35R turbo. The only problem is that it costs $250 less than normal, oh wait - that's a feature
Oh yeah, they are in stock also.
BOOST ON!
Robert Young