racin-type wrote:
I want to make around 300rwhp, just trying to keep it nice and simple and not blow sh*t up.
Modified by racin-type at 6:35 PM 6/7/2006
For 300 Max HP, you're not going to be running into critically large amounts of boost with any T4 compressor. You can probably afford a bit of resistance and get good spool characteristics. I would really evaluate yourelf and determine if you may look to be increasing the boost later. If this is the case, I'd err a bit bigger/better efficiency just to give yourself a little headroom later.
If you want to take a safe approach, find yourself a T04E 50 Trim compressor as it will cover a broad range of boost levels quite well. For the exhaust side, I'd probably stick with at least a Stage 3 trim (I'd be quick to use a Stage 5 myself if I had to use a T3 turbine). A/R will fine tune the boost response, but even some of the larger A/R's should still spool reasonably well. It's much cheaper and easier to swap out just the turbine housing so if you ended up wanting a different A/R later, it would make things easier on you. Changing a turbine trim will force you to minimally disassemble and rebuild the wheels, perhaps get them balanced, etc, etc. I tend to favor larger turbines for my use though so a Stage 3 for me would be rather small (I ran a T4 turbine when I had a KAT).