GuamEVO

What is the highest boost pressure that the stock 04 Evo * motor can handle without sacrificing its reliability. Stock is 18 psi would it still be safe to go to 20 or 22?

EvoAznBoi

iTrader: (22)

22 is safe

dastallion951

22 psi is definitely safe, when i was on my stock 03 turbo, i went 24 psi peak held 21 to redline which is out of its efficiency range got 20+k miles out of it, but the car already had 39k when i bought it. Its all in the tune, and makin sure the engine and turbo are mechanically good then you shouldnt have an issue.

05blue8

iTrader: (28)

The stock turbo likely can't produce enough power on pump gas to destroy a motor but the tune can kill it, also you can easily spin the turbo out of it's efficiency range and kill it long before the motor will die

escodotcarter

iTrader: (16)

i have a stock evo ix turbo and I spike to about 25psi

savagejay1

I have an 04 still with the 8 turbo and I'm running 25psi.

Joshs EVO

iTrader: (46)

Ha your form Guam. Cool. I was there in Navy for a few yrs and saw only 2 evos there and at the time the dealer wanted 52000 for a brand new one. How many Evos are there now?

GuamEVO

Quite a few from VIII GSR, MR, RS to X, there is also a Mitsubishi Club of Guam.

There is no longer a Mitsu dealer on guam.

GuamEVO

Thanks for everyones input. There are no tuners on guam and my car is stock except for an ARC intake. I will set the boost at 22 psi. The car has 50K miles on it. Will this destroy my OEM BPV (plastic)?

dastallion951

destroy it no, but there is a chance down the road it might start leaking, you can either get a ix valve which is metal for higher boost, or eventually when it goes out look into an aftermarket one. Dont replace it until it breaks haha

GuamEVO

How will I know if it has leaked?

dastallion951

usually if it doesnt hold the boost level it should be at, then usually thats a sign, stock plastic 8 diverter valves are known for leakin usually a couple pounds above stock levels.

sparky

iTrader: (1)

What is the octane level of the gasoline that you are running in your Evo, OP? In Guam is octane rated using the RON method( RON=Research Octane Number)?

GuamEVO

Yes I beleive so 91 RON