Anyone running ej25 sohc heads on an ej22t?

[gt2.5turbo]

Im eventuallly going to run the sohc ej25 heads on my 22t block and was just wondering if anyone was actuallly running this set up? Ive read about it in the archive and a little on nasioc just wanted to know if anyone activily on this board had this setup

[Matt Monson]

Nobody here that I know of is running them. Just Wedge and Drac9 from NASIOC. Drac9 is in C. Springs, so you could probably go see him. But the thing is I think he may have switched his set up back to DOHC again. He got some TWE heads from Irish Mike's, but they cracked, and I don't know what he has on his car today. He changes things a lot.

But what specifically do you want to know?

[tzedek]

that should make for a badass turbo motor.

[gt2.5turbo]

i plan to use the 2.5 rs sohc head to lower my compression a little and run a vf22 turbo and a perfect power managment system. Plus with the less restrictive heads i imagine it would be an great improvement from the turbo heads. Yeah i think it would be a great set up and i cant wait to see how much see pulls...

[J-MoNeY]

Boom boom tranny.

[scuzzy]

Boom boom tranny.

Nonsense, you just need to upgrade it like everything else.

One of these should do just fine

[IronMonkeyL255]

??

Wuzzat?


Talking to a subaru tech the other day, he mentioned that our heads don't suck as badly as we seem to think they do.

With a bit of work (5-angle valve job and porting), they can easily outflow RS heads.

Also, since they were made for a turbo motor, they are stiffer than the RS heads.

I'm not sure how much of that is true, but this guy know his stuff. He recently built a 500+ HP STi for a customer, and is planning on dropping an EJ22T block into his WRX.......

Just some food for thought.

[dzx]

Mark R in Denver is running 2.5RS heads on his EJ22T motor. They are the DOHC model though. I cant remember what the deal was, but i think it had something to do with timing.

[azn2nr]

yeah ive been wondering about heads too. marks are phase 1 doch. i was looking into getting some phase 2 doch heads. mostly because of avaiblity.

[Matt Monson]

??

Wuzzat?


Talking to a subaru tech the other day, he mentioned that our heads don't suck as badly as we seem to think they do.

With a bit of work (5-angle valve job and porting), they can easily outflow RS heads.

Also, since they were made for a turbo motor, they are stiffer than the RS heads.

I'm not sure how much of that is true, but this guy know his stuff. He recently built a 500+ HP STi for a customer, and is planning on dropping an EJ22T block into his WRX.......

Just some food for thought.

I think he's talking out his ass. Stiffer than the RS heads? WTF? Tell me why this matters? And how did he measure this?

And easily outflow? You need to make up 50 cfm on the intake and 35cfm on the exhaust just to catch the Ej25 heads. You are going to need a hell of a port job and most likely larger valves to get there. That a lot of time and money when you can just get a set of Ej25 heads off the shelf. And him building a 500hp STi is nothing special. There are 500hp STi's everywhere.

[Matt Monson]

Mark R in Denver is running 2.5RS heads on his EJ22T motor. They are the DOHC model though. I cant remember what the deal was, but i think it had something to do with timing.

Doesn't have anything to do with timing. Other than he hasn't been able to upgrade to v8 STi heads because of timing. He's using those heads because they are what came on the car, easy to get, and they are cut on WRX cores...

[IronMonkeyL255]

I think he's talking out his ass. Stiffer than the RS heads? WTF? Tell me why this matters? And how did he measure this?

And easily outflow? You need to make up 50 cfm on the intake and 35cfm on the exhaust just to catch the Ej25 heads. You are going to need a hell of a port job and most likely larger valves to get there. That a lot of time and money when you can just get a set of Ej25 heads off the shelf. And him building a 500hp STi is nothing special. There are 500hp STi's everywhere.

I'm guessing that stiffer helps when running high boost. About like the way fully closed deck is better than open deck blocks.

As for how he measured this, I doubt he did. He probably has access to a bit more info from Subaru engineers that actually have, though.


Sure there are 500 HP STIs everywhere, but most of them are built by the same shops. Besides, when was the last time you built a 510 HP track STi that can outrun Porsches on road courses?

He may be talking out of his ass. I'll ask him for his sources next time I see him. Though it IS possible we don't know EVERYTHING about our cars, as some of us seem to think we do.




Sorry. Annoying day at school and have to work tonight. Just venting.

Also, I felt the tone of your post was rather condescending. An attack on me for posting info gleaned from another source.

[Matt Monson]

I think he's talking out his ass. Stiffer than the RS heads? WTF? Tell me why this matters? And how did he measure this?

And easily outflow? You need to make up 50 cfm on the intake and 35cfm on the exhaust just to catch the Ej25 heads. You are going to need a hell of a port job and most likely larger valves to get there. That a lot of time and money when you can just get a set of Ej25 heads off the shelf. And him building a 500hp STi is nothing special. There are 500hp STi's everywhere.

I'm guessing that stiffer helps when running high boost. About like the way fully closed deck is better than open deck blocks.

As for how he measured this, I doubt he did. He probably has access to a bit more info from Subaru engineers that actually have, though.


Sure there are 500 HP STIs everywhere, but most of them are built by the same shops. Besides, when was the last time you built a 510 HP track STi that can outrun Porsches on road courses?

He may be talking out of his ass. I'll ask him for his sources next time I see him. Though it IS possible we don't know EVERYTHING about our cars, as some of us seem to think we do.




Sorry. Annoying day at school and have to work tonight. Just venting.

Also, I felt the tone of your post was rather condescending. An attack on me for posting info gleaned from another source.

Not to be rude, but it sounds like a personal problem if you are going to take it as condescending or aren't open to disagreement because you had a bad day. It's remarks like yours,"Though it IS possible we don't know EVERYTHING about our cars, as some of us seem to think we do" that contain personal attacks on our members. Just because I disagree with something you are repeating from a tech doesn't mean I think you a fool.

And I only made comments about the 500hp STi's because you were listing it as some sort of credential behind his knowledge base. The thing is that is a very simple and generally well known formula. Now if this guy was building 500hp EJ22t's with stock Ej22t's that he had ported and done a valve job on, I would have some respect for him.

[IronMonkeyL255]

I'll try not to make such scathing generalizations in the future. I was simply trying to put a new bit of information on here to get people asking questions.

It may be a personal problem that I am so defensive, because whenever I post anything, I am met with proverbial dumb stares and treated like a complete moron. I am starting to get a bit fed-up with it. Just because I want to learn more about our cars and contribute a little, doesn't mean I have to be kicked around for it.

[/rant]

BTW, he used to have an n/a EJ22 w/ fully worked EJ22T heads (high c/r) that ran pretty darn good 1/8 mile times (better than stock WRX). Then his former wife ran off with it.


edit: I shouldn't have typed that to begin with......

[IronMonkeyL255]

Oh, and I believe that he was talking about the phase I SOHC heads. The SOHC RS heads are phase II.

Or am I wrong again?

[Matt Monson]

Oh, and I believe that he was talking about the phase I SOHC heads. The SOHC RS heads are phase II.

Or am I wrong again?

The Ej22E and Ej22T heads are the phase I heads. And I would love to see some emprical evidence to back up his claim regarding their flow after porting and valve work. I personally don't think those heads are crap, and anyone who knows me and my history knows that I have been playing with those heads in a couple of different types of builds.

I would also like to see something technical showing that the heads are somehow stiffer. Having 6 different types of heads in my garage right now, I fail to see how they could be in some way stiffer. But maybe they are. Afterall, they have far fewer instances of warping than either the DOHC or SOHC EJ25 heads. Maybe that is where being stiffer is an advantage?

[IronMonkeyL255]

Oh, and I believe that he was talking about the phase I SOHC heads. The SOHC RS heads are phase II.

Or am I wrong again?

The Ej22E and Ej22T heads are the phase I heads. And I would love to see some emprical evidence to back up his claim regarding their flow after porting and valve work. I personally don't think those heads are crap, and anyone who knows me and my history knows that I have been playing with those heads in a couple of different types of builds.

I would also like to see something technical showing that the heads are somehow stiffer. Having 6 different types of heads in my garage right now, I fail to see how they could be in some way stiffer. But maybe they are. Afterall, they have far fewer instances of warping than either the DOHC or SOHC EJ25 heads. Maybe that is where being stiffer is an advantage?

I will ask the tech if he has any flow charts sitting around from after he did that.

[-K-]

A stiffer head would keep head gaskets together better at high boost as well.

[IronMonkeyL255]

I was thinking it wouldn't be all that farfetched, considering our blocks are stiffer just from the manufacturing process and aluminum used......

I'll see if I can get my hands on some hard info.

[Matt Monson]

Well,
If the cross hatches on the surface are any indication, it would suggest that the same medium pressure casting method used on the Ej22t block was used on the heads as well. I would love to see a technical document to back this up...