legacycentral bbs

so I searched an found a ton of people who want to go 8K revs and what not... Im just looking to go 7... on everything being bone stock at 12 PSi with a TD04 FMIC and exhaust as long as I replaced my valve springs would there be any issues in having 7K as my redline an hitting it fairly often... would rods or bearigns be an issue?

hitting it often sounds like its for autox am i right?
with my tdo4,tmic,11psi,exhaust i still notice the power drop off around 5800 so i dont see 7000 helping all too much you would be better off to shift to second, at least thats what i do and thats what works the best for me

imo the ej22t heads dont flow enough to be useful above the 5500rpm range

I find mine makes great power to 6 especially since the exhaust but just mainly for the ability to rev to 7 grand... I just like knowing I can lol

Upgrade your heads to EJ20G's or EJ205's. Then you won't have to upgrade anything except EM for 7k redline and you'll actually see the benefits!

Unless you upgrade your turbo to a 16G or VF30-34 ect.. I don't think it's worth while.

I used to hit 7250 all the time, or so my tach read. Didn't lose a bearing, but It's definately one of the things I was worried about. However, all that happened was I lost a lot of compression in #4. Dunno why yet, too lazy to diag.

At anyrate, I'd be most concerened about a bearing destroying itself. These bearings aren't even good with the engine bone stock.

Do the EJ20G heads/intake and get a 16g Thats what im in the process of doing right now OH how fun it will be to start it again for the first time.

What is the compression ratio on a ej22t shortblock with Legacy ej20g heads?

I thought that they had larger combustion chambers then the stock 22t heads.

Splinter wrote:imo the ej22t heads dont flow enough to be useful above the 5500rpm range

Second that.

i forgot but its really low...

It's something like 7.8:1 IIRC. Not too bad since the 16G is fully spooled by around 3k rpm and will hold up to 18 psi all the way to redline....

My math gets 6.8:1 with the stock head gasket, which seems a bit low for any off boost performance. Check this thread for more...

http://bbs.legacycentral.org/viewtopic. ... dohc+heads

Gary

legacy92ej22t wrote:It's something like 7.8:1 IIRC. Not too bad since the 16G is fully spooled by around 3k rpm and will hold up to 18 psi all the way to redline....

Man that just makes me want my car to be finished It's gonna be fun.

so i need a set of 2.0 turbo GC8 heads?? I found a set all it says is 2.0 GC8 turbo heads will they work an which head gasket o i use

The EJ25 DOHC & SOHC head are a good option, I believe both have 46cc chambers (I know the DOHC do). With the stock piston dish of 28cc and the 1.5mm head gasket you’ll get 7.5:1, not bad with a little more than stock boost. Stock EJ22T is 8:1 with 40cc heads. If you use the Wiseco forged pistons with the 20cc chamber you get 8.1:1 (I’m currently working on this build).

There is a .5mm gasket but the EJ22T pistons come above deck by about 0.015” and there is no clearance. I’ve heard rumor that there may be a 1mm gasket (from the 2.5 SOHC??), but the advantage of the 1.5mm is that you can use the EJ22T gasket which matches the bore with out a step (2.0 gasket) or gap (2.5 gasket), neither of which are good for sealing, flow or mixing.

Gary

Wow.... umm... thats alot... so are the gc8 heads with cams an such a good upgrade for 450 canadian or would i be better off with a set of 2.5 dohc.... basicaly what heads off whihc subaru do i want

The gc8s should be good, I'm just not shure where the CR will workout, basically any of the new gen heads are gonna be better than the stock EJ22Ts, they have tiny valves.

EJ22T - EJ20G - EJ25 Ph 1



On the topic of revs... I'm assuming you are going stand alone EM to get passed the stock limiter? And FWIW, my stock EJ22T had 250,000 miles on it before I started my build (there was nothing wrong with it when I pulled it) and I ran it to redline half a dozen times every day and had no problems with bearings, Subie bottom ends are tough.

Gary

The only problem I get is ring associated, which then leads to bearing failure if not caught first. Thats what happened to my first turbo motor.

is there not a wire i can cross or cut or somthing that runs the limiter.... or an aftermarket computer...i hit limiter at 6500 in second gear once or twice but then randomly hit 7 grand one day.... i was pissed at it an gave it a hugh revv

speaking of reving. i ran a guy last night in a 2003 lexus ls430 and i was shifting to fourth but i antecedently went down to second at the top of thre'd.


motor flys a little over 8k, and just about shit my self......

Splinter wrote:imo the ej22t heads dont flow enough to be useful above the 5500rpm range

get different cams.