Here is a chart with the 50(SC-50) and 57(SC-34) trim turbo. You can see the differences when looking at the chart.
The AR for the compressor will depend on which housing is used. B/E/S
You can check turbonetics or majestic for compressor maps to compare. Note the large efficient map in the 50 trim in the E housing. Now check the inducer size compared to the exducer size. You will see that it has a smaller inducer than the 54 or 57 trim and the exducer is larger than both of the other turbos. This is why the map on the 50 trim is so broad. This makes it a great turbo for 400 hp applications with quick spool for power down low and the ability to make good power in the upper rpm range. Note that the 50 trim can spin at 120K plus and still be efficient. This should give you a smooth flatter torque curve throughout the rpm range. Good for street/autocross and OK for track use.
The 57 trim has a smaller map and is good for maximum efficiency/air flow in a narrower rpm range. This means the power comes on strong in the mid rpm range and hits max efficiency in the upper mid rpm range. Good for drag racing and OK for the street/autocross. Note the airflow at a lower psi setting compared the 50 trim.
The garrett 60-1 is an example of a turbo with a good amount of lag, but when it hits oh-my-god hang on. It flows quite a bit of air, but really needs a stroker to take advantage of it. If you plan on using a 50-75 shot, this turbo would be wicked as hell.
I personally like the PTE SC-61. A local guy made 539whp on 22psi out of a 2.0L honda motor. It also spooled 800rpm sooner than the 60-1 he previously had on the car.
I think the SC-50 is selling for $650 shipped, SC-61 is selling for $700 shipped and the new garrett(direct from garrett) 60-1 is selling for $625 shipped.
97 RS(PTE SC-61, Built Long Block, Electromotive Tec 3)It's Here!
