Yo was up! i have an 2003 Evo 8 and would like to know how much boost can the stock turbo handle? Right now, i'm running 20 psi of boost.

 

Depends on what you have, but I spike 28psi on E85 fuel on the stock turbo.

 

Here we go again.......

 

Ehh leave it up to your tuner!

 

like what kind of evo i have? i have the regular model, no MR

 

The weak point isn't your turbo, it's the rest of the system. The plastic diverter valve and the couplers are the first.

Listen to your tuner. I personally wouldn't push more than 26psi with out upgrading the turbo. From the sounds of it, you'd be happy with 25psi and hard pipes. Do yourself a favor and get a JDM diverter valve.

 

+1

 

ok. so where can i get one at? so will my car be alright if i run 21 or 22psi?

 

ur not gonna feel 21 or 22...itll feel the same as 20 ...like everyone else said leaave it to the tuner...the more u turn it up the slower ull probably go

 

You can get a JDM diverter valve from another member (MR's and IX's have them), from lancershop, evomoto, gruppe-s, etc. I wouldn't turn up anything unless you know what you're doing and can retune it.

 

alright then! thanks everyone for helping me out.

 

Curious as to why you said that. Were you just referring to turning up boost w/o a tune?

 

correct...when i first got my car 2-3 years ago i put every bolt on possible in it..and i turned up the boost...dyno proven i lost about 50hp and 80tq

as for you i would keep it around 19-20.. with a fuel pump and the cat delete

 

this question gets asked every week

 

I've seen this listed in other threads as well. Can someone show me a link as to what these are and where I can get them?