Hey Im wondering if anyone knows reliable information regarding the STi (EJ25) block and how much power it can handle stock. My friend is putting on GT35R and will be running methanol ~30psi or so. He claims the block can handle well over 600whp, seems very optimistic. Anyone have any real claims? Ive had people sya 500whp is really pushing the limit.

 

It depends on if he has motor mounts, etc. Mods that would increase the stability of the engine, headstuds, etc. Of course its putting a lot of stress on the block like that. With a good tune, I'm sure it could handle it. In most stock applications, however, it's not really a question as to IF a car can handle that on its stock block, but how long. Of course, not many cars could run that on a stock block for very long, especially in full racing conditions. But taking it to the strip and driving it daily will likely make it last a lot longer. But if he's going to track it on a weekly basis, I would get a different block. He has nothing to lose by trying it, though. If it breaks, he'll just have to upgrade.

 

You are really pushing it when you get above 500WHP on a stock EJ25

 

You'll probably get more responses from www.nasioc.com/forums

 

Ej25 dont know.. semi-open deck motor! I think it would depend on the tuning. Its not as stout as a 4g63.

 

590whp has been reached on the stock sti block.

Its all about the tune, but IMO if you go over 400whp you must get a built block. you ahve to pay to play. We dont have the pleasure of having the amazing motor of the 4g63 because the ej series is new compared to the 4g63. Also the pistons in the ej25 are the weak points as it already ahs forged rods and a forged crank. If you drop in pistons the block should take 500 whp with a good tune.

go to www.iwsti.com for more information. its a sti specific forum and probably one of the best forums around in general.


Oh and your friend seems a littel confused.. Just because he is running meth injection doesnt mean he will run 30psi. More like 22-23psi on the street. Now on race gas 30+ psi is not a problem.

If hes running pure methanol ( which i doubt) than ya 3opsi would be good.

You cant expect a stock ej25 block to hold 600whp and i doubt it will last long if it doesnt blow during tuning. It must have a perfect tune and the owner must baby the car to reach that level without blowing it up.

If you go big you better have the cash to spend when something breaks, because something will when on the stock block.

the plus side is a stock sti tranny is good for 600whp+ so he really only needs to worry about the block.

 

ive heard bout 400-450whp is close to the limits for the rings or ringlands. otherwise it should. just throw in a set of forged pistons and have fun

 

+10000!!You got to pay to play.

 

theres only when gaurentee when modding big : everything will not go as planned.

 

He will be running straight methanol. Some guy Junior from ICS is going to tune it.

BTW, my friend is only 18 and he drives like a maniac.... thats why Im thinking its not going to last, regardless of the the tune.

 

doesnt meth burn much faster than gasoline?

i hope its not a daily driver.

 

Oh God thats all this kid needs... a 500whp STI I give it a few months before him and/or the car are toast

 

HA! He'll blow it up, no doubt.

I really doubt he's running straight methanol. There are a few things that need to be done in order to run that. He's probably just running pump gas with a meth kit. If so, it would be very unwise to run 30psi on pump gas and meth.

It's all in the tune. There are a couple people on nasioc with 35R's that have 10,000-20,000 miles on a stock block. Then there are guys that are blowing motors with the stock turbo.

I have a set of CP pistons and ARP head studs in my engine and Perrin's GT35R kit and I made 505whp on Buschur's dyno using cam2 114 leaded race gas and 33psi tapering to 31psi by redline. Another guy with a stock motor, same setup as me made 490whp on Buschur's dyno, but he was using C16 and 32psi to redline. So as you can see, there are some benefits to upgrading the pistons....I made 20whp more at the same boost level and a lower octane race gas.

 

+1

 

When I said running straight methanol I meant via injection kit. He will be running 93octane+meth injection (100% meth, no like additives or 50.50 ****).

He has the Perrin kit, fuel system, fmic, yada. He said he thinks hes gonna get 520whp which I thought would be possible.. he said 550whp first.. i said that was sketchy, reliablity wise.