Exhaust Housing A/R sizes

[Pir8pete]

I need to know what the differences would be to each one.

 

[webby]

It's going to alter the peak power numbers ...but also it's going to alter how fast you spool depending on the size. I'd talk to prl about what your end goals are for power.

 

[webby]

For example, @ripply did a .82
http://9thcivic.com/forum/threads/650whp-or-bust.14353/

 

[dpetro1]

Copying the reply I left from the other forum...

www.turbobygarrett.com/turbobygarrett/turbine_housing_AR_and_housing_sizing
Basically, the smaller a/r will spool faster but have less flow (hp)

The gt30r is good to 450-500hp depending on ar