[Robert]

Originally Posted by wdodge45

Robert,
Greg said the wheels were a P trim and no wheels r available anymore due to these being older style??? Hard to believe no wheels for such a popular turbo?
So, where do we go from here.....GT-K 550, 650 or new style TN 62-1??? This does create more issues sooooooooo, looking for ur help here.
Thanks,
Bill

Well he is correct the P trim wheel was dicontinued and replaced with the F1-62 wheel. I'm double checking it with the manager but I'm fairly certain you could upgrade the turbine wheels to the newer F1-62 with the same bearing housing but at that point a new turbo wouldn't be a bad idea anyways. A GT-K 650 isn't a bad idea at all actually. The GT-K 650 uses an HP66 compressor wheel with a peak flow of 72 lb/min of air. The 62-1 produces about 65 lb/min of air and the 60-1 produces a max of 57 lb/min of air. VERY VERY VERY generally speaking you make about 10 HP per lb/min of air. Before anyone jumps down my throat on that its a very very rough guideline to start with and then adjust dependent on the characteristics of the motor and system design. So to put things in perspective you were making about 1200-1300 HP with two turbos that would produce a generalized 1040 HP of air. The 62-1s would have taking you to 1300 HP of air (the 200 HP difference we were looking to get to). The HP66 compressor wheel from the GT-K 650 takes that to 1420 HP of air.

What does that mean to you? The GT-K 650 will meet your goal of 1500 HP and have headroom to spare with ZERO issues. The other nice thing about the GT-K 650 is the newer F1 turbine wheels flow more air than any previous model turbine wheel (like the old P trims) and still get you spooled up FASTER than the older turbine wheels. The other very positive point for the GT-K 650 is the ported compressor shroud. By porting the compressor inlet shroud the air can bypass the inducer a bit at lower boost pressure and will actually increase the compressors efficiency at lower engine speeds. That means more power at the bottom end by just porting than shroud then you would have not doing it.

If new turbos are in the cards the GT-K 650s are a GREAT choice for your application. The boost curve IS going to change. Your car will spool up a little bit different then it used to with the 60-1s you used to have but it should be for the better. You should actually spool up a bit faster and make MORE power an the bottom end the you ever did. Plus you will have the 1500 HP you are looking for to go with it.