If I were to get a boost controller how high can I turn up the boost without damaging the stock turbo or anything else? Is it even possible to boost up on a bone stock Evo? My friend told me I can turn the boost up and get easily 340hp without any damage to the engine or turbo. Should I just slap him?

Slap Him.


Cabo

yes slap him twice... i think most people are turning the boost up to about a max 21-22psi on a stock setup.. and with no other mods there is no wawy you can hit 340hp lol

you can easily get 340hp with a bone stock... the only question is, how many hours of aggressive driving can you do until you blow your head gasket

Yes I will slap his fat ***. My friend keeps telling me that he used to have a Eclipse and that 4g63 motor is bulletproof.

BTW whats the stock boost and if I were to turn up the boost how much higher can I boost up safely? Sorry for the newb question but whats the difference between PSI and bar?

The stock boost is 19.5psi, I believe. And keep in mind that this is the peak boost. By the time get to the redline, your boost tapers off to about 16psi.

I had my car dynoflashed last weekend (a process where they reflash your ecu and change the tuning a bit). While on the dyno, Al turned the boost up to no more than 20psi. With an intake and 3" turboback exhaust (with stock cat/ fuel pump) I made 290 hp to the wheels. I'm guessing this like 320-340hp to crank (anyone?) While this is pretty good, my fuel pump was pretty much cutting out at that point, so I was running pretty lean. Al recomended that I not run the car at 20psi consistently. So...think about it before turning the boost up. I could probably run 21 psi, but I'm not. At least until I can get a new fuel pump put in the car.

depends on tune and oct gas. On 91 only about 19 to 20psi on 93 or better a little more.

Derek,

You have that JDM Evo 8, not the US model, correct? In addition, you're not running US gas. I'm not sure everything said so far applies.

d

as stated... boost taper is a huge problem for the evo... this was done to give a huge safety margin considering the cali **** gas.....

now just preventing the boost taper really means you keep 19 psi all the way, which is like 2 or 3 psi at the top end!!!!

if you want to go beyond 19 psi, i would recommend fuel pump, ecu flash or piggyback

I have a 04 stock Evo with only a hallman mbc and a K&N panel filter and in running 20psi all the way to redline with no problems, but im always running 93 octane

Actually I have the US spec model. Over here its LHD. Normal pump gas is 98 octane here but due do the quality I heard its about the same as 92 octane. Dont know if its tur or not?

Eclipse is different. YOu can safely push the boost up to 30 psi with no problems for that car.

Whats the difference?

The 4g63 is one of if not the best engine for handling boost.

Slap him with your....