twin help on S474 specs

Robts

Robts

Proud Fummins Owner
Joined
May 16, 2006
Messages
2,321
If I went with a phat shaft 62 and was getting a s475 or s474...what specs should I get with the 74/75

T6?
Ar?
Wheel?

Anything else I would need to order it
 
Part #171702 IIRC. The most common 475 on the planet and you can pick em up for ~600 bucks brand new.
 
Depends on your power level. I ran an SPS62/ over 75/96/1.32 for a while and it was ok. I swapped a 75/83/1.1 in and it was one of the best setups I ever had. I was just over 700hp at the time and it daily drove/towed great. Spooled up really fast though and liked to light tires up. Not that it's a really bad thing, but it is harder on parts. At 700 or less I would run the smaller turbine and exhaust side. Turbo is smaller and lighter too.

RonA
 
The '95 we built a while back has a 62/71/.7 over a 75/83/1.1...only at 580hp and it keeps blowing NV4500s apart. LOL
 
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