Garrett 38r
 

How much power and psi is this turbo good for? It's on the truck im buying.

With a 1:00 A/R Exhaust housing 450-475hp With the 1:15 You can go a little higher (500 to 525HP) but you will get more smoke with that HP numbers.. But if you want to go higher yet you have to use a GT47 or GT55 to feed the 38R

As for boost they are good to 40 PSI, BUT your turbo will like you better if you keep it 34 and under:tu:

Re: Garrett 38r
 

500 or so give or take. If you want more you can get a bigger single. You don't have to run compunds.

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Garrett 38r
 

Ok cool thanks guys it's going to be awhile till I get to those numbers but at least I won't have to buy a turbo

yep they are a good turbo. BB so you get good spool up.

Good proof is Brian Jelich, best pull was 992HP with a single turbo, and tweaking for 1,000+.