I don't know if this question has already been answered here (I couldn't find anything). I'm trying to figure out how much boost can safely be run on a stock Evo 8 turbo?

These are the upgrades I've got:

Coilpacks from Spoolinup.com
Downpipe
3" Catback
ETS 4" intercooler short route and speed density intake
TiAL Q BOV
Omni 4 Bar MAP
AEM 320 LPH pump

Tuned on 93 and currently running 22psi.
Any advice or personal experiences running 25psi and higher on stock turbo?

 

I run 25 psi on the stock 8 turbo. No problems here.

 

I was running 28psi on a stock IX turbo before I upgraded it. The issue with the stock turbo though is it gets to a point where you're no longer boosting and the turbo is just blowing hot air so to speak. But to answer your question on an VIII turbo I would say 26 psi is a good "cap" to stay under/around. Can you boost more? Of course you can, but again you'll be just blowing hot air.

 

^^true 26 is pretty much maxxed on pump. I peak to 25 and the taper to 21 at redline.

 

on the 8 turbo you get a few psi above stock then it quite literally runs out of steam. you will still compress air, but in excess of a certain amount it becomes useless. and as most will say dont touch the boost without a tune.

 

Thanks for all the responses. It's really helpful. Going in for a new tune sometime next week and gonna start pushing 25psi.

 

I have my 20g set to quick spool to 30 psi and hold there all the way through redline. It feels so amazing when it kicks in at 30 it literally throws you back into the seat. I know not tapering is probably hell on my internals but meh its been fine like that for a year and will eventually give me a reason to do a 2.3 rebuild

 

^^ nice, mods?