hey guys I've got a 04 evo 8, wanting to know if the boost it's tuned too is too much or safe? this is my daily driver and i went from my 420 gay eclipse to this, so you can understand where i'm coming from when i worry about reliability.
Here's the Mods, and it's ran on 93oct pump gas.
evo 9 tranny
evo 9 turbo se
twin disk clutch exeddy
full exhaust apexi
test pipe
272 cams hks
suction intake hks
greddy turbo timer
defi boost gauge
tuned by a.m.s to 24 psi
carbon fiber hood
tien lowering springs
arp head studs

thanks for any help fella's!

 

24 psi on 93 octane sounds fine to me, I run 23-24 on my aggressive-ish 91 octane street map.

 

Yes, that is a safe boot level. If you didn't have the ARP head studs, I would be a bit weary. Are you on the stock intercooler?

FWIW, I ran 27 PSI on the stock VIII turbo on 93 OCT (with a 3.5" ETS intercooler).


-Bink

 

Why would you be weary if he didnt have headstuds? 24psi on stock turbo is nothing. I run more then that on a 3586 on stock head bolts

 

yea i'm on stock inter cooler and piping.

 

Because not having them is a bad idea.
Some people have better luck with the stock head bolts than others.

This is the same argument about how some people run 400+ ft/lbs of tq on the stock block just fine, others run less and window their blocks. It's cheap insurance. For 100$ why wouldn't you do it?


I'd consider an intercooler upgrade, but if the tune isn't knocking, your fine. I'd also make sure it doesn't knock when summer comes back around. The stock intercooler will heat soak quickly on a hot day.



-Bink

 

That's a safe level. I'm @27 psi with stock internal & stock turbo.

 

Because its a good bit of work to pull the head off and put that $100 part in. Its just not needed im my opinion until your making a lot of power

 

I run about 31 psi on stock turbo, 93 oct and stock headstuds for years now. It all depends on the tune. Fuel and timing plays a big part.

 

this ^^^ and spark.

if your plugs aren't gapped tightly, you can blow them out with high boost and lift your head pretty easily with the resultant misfire

im not speaking from experience or anything... lol

 

I never pulled my head off. I took out all the head bolts, then put in the ARP head studs (not the 1x1, I took out all of them at the same time and then put the ARP head studs in). Worked like a charm Ran it like that for 25,000 miles.


-Bink

 

thanks for the reassurance guys. i'm pretty sure i'm going to need a TC soon tho.

 

my car has arp 's and its blowing oil out the block. so if i were you i would just pull the head and do it right. !!

 

You sure that isn't due to a bad valve cover gasket?

 

He did say its blowing oil out of the block, not the head. Either he mistyped or I would more likely guess hg than vc gasket. Although ive always seen "blowing oil out" when someone is referring to oil coming out of the head