Currently running a T3/T4 turbo (54 trim on intake, Stage III exh.) on my B18C CRX race car. It makes 440 whp at 22 lbs. Adding boost makes no more power, so I must have too small a turbo. I want 30 lbs boost to make more whp. When I plot this requirement on various compressor maps, the T66 puts me right in the sweet spot of the map. I can't believe I need to jump to this huge turbo to get 30 lbs efficiently. BTW, I have a KG ported head and Web turbo cams. Anyone have any ideas as to what size turbo I should buy? Am I missing something?

 

Turbonetics garrett 60-1

 

what about IC efficiency and what numbers does your head flow first?

 

i would go with a 60-1 as stated above. I just got mine from Majestic turbo and it cost me 750 with a water cooled center section. I want 500whp and this is what they recommended for me.