[jkidd]

You can make 600HP on the 64.5mm and it will spool a bit faster. for 600HP we have a 64.5mm/88m exducer with 73.4mm turbine and a quick spooling 12cm housing. It should perform better than the super B special that was a 64.5mm/ 91mm with the 71mm turbine wheel and 14cm gated housing.

The new 64.5mm SXE will flow more than the old 66mm cast wheel and it is lighter. Its a Win/Win.

If you want more than 600HP then go compunds or be prepared for lag. The 66mm would be good for 650HP and the 69mm 700hp. They both have the 91mm exducer on the compressor wheel.

 

[jkidd]

I would do a 64mm turbo SXE turbo.

A 64.5/73.4/14 would be slower spooling. The 14cm would not be as responsive during daily driving nd towing. With a 12cm Peak EGT will be a little higher, and be a little lower EGT (because it ill spool faster) during cruising and towing.

With any set up you have a compromise Quick spool vs peak EGT.... Except with compounds--- where the compromise is $$$.

The 12cm will tow better and spool better @ 600HP.