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Old 09-12-2003, 04:03 AM   #26
totoherbs
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Quote:
Originally posted by I-Speed USA
The 2.0 had the stock WRX exhaust. Knowing that the tdo4 would be too tiny and that the stock exhaust would hamper the 2.5 STI block , we changed them out for the dyno run.

Also, we felt that the mods we dynoed ,with the STi block, were common wrx mods that most people would already have.

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Which makse sense because who is going to spend all that money on putting in a block and then use the stock trubo.
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Old 09-12-2003, 12:28 PM   #27
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Apparently there are those out there that would like to see that specific combo (tdo4 and stock wrx exhaust) dyno run.
Well, no matter how much progress we make, it seems that we can't make every one happy

Chris
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Old 09-13-2003, 06:48 PM   #28
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Chris,

So would the idea be to use the STi short block with WRX heads and our stock wrx other bits?

How much would you estimate this job to cost?

Are you planning to try other turbos on your hybrid? (18G, 20G)

What is the spool up rpm of the VF30 on the 2.5 as compared to the 2.0.

Finally, any hopes out there for less expensive 6mt trannys?

Thanks for the great work at I-Speed!

Steve
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Old 09-13-2003, 09:37 PM   #29
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Less expencive 6speeds ya right...


As for the spool up on the 2.5 vs 2.0 many people have said that there wont be a difference..... I dont know why but alot of experts have told me such.
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Old 09-15-2003, 02:51 PM   #30
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The 2.5L should reduce the perceived lag which isn't much to begin with - but it's a stronger block nonetheless.
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Old 09-16-2003, 08:30 PM   #31
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Might I-Speed ever offer a swap from a NA engine to a WRX engine + 2.5 shortblock + the other usual upgrades?

This may be the route I go, the results are impressive, and could probably squeak past CARB, right?

any ballparks what the swap would cost vs. a standard 2.0 swap?

-s
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Old 02-09-2004, 01:30 AM   #32
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We'll see how the XT motor holds up to 8k rpm, an SR50 and massive boost pretty soon...
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Old 02-09-2004, 01:42 AM   #33
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Quote:
Originally posted by DubuRX
We'll see how the XT motor holds up to 8k rpm, an SR50 and massive boost pretty soon...
Thier are a few people running the motor to 8k, but with short duration cams putting the power band at 6ish why would you need to hit 8k?
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Old 02-09-2004, 01:45 AM   #34
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gearing...
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Old 02-09-2004, 01:51 AM   #35
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Quote:
Originally posted by DubuRX
gearing...
Are you running a 6 speed?
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Old 02-09-2004, 01:52 AM   #36
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not for a while.
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Old 02-09-2004, 01:55 AM   #37
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Then I dont understand... the 5 speed has wider gears then the 6.... and most of the people with the 6 dont feel the need to do to 8k. You dont think the SR50 will be out of wind by 8k on that block?

Good luck, make sure to let us know how it works out.
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Old 02-09-2004, 01:59 AM   #38
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We'll see... I think the SR50 would work well with the 2.5, but I may be wrong.
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Old 02-09-2004, 01:25 PM   #39
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There is a difference between working well with the 2.5 and working well with an EJ25 spinning at 8k RPM.

-Jon
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Old 02-09-2004, 02:33 PM   #40
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Quote:
Originally posted by stimpy
There is a difference between working well with the 2.5 and working well with an EJ25 spinning at 8k RPM.

-Jon
Agreed.... someone did the math and ill try and find it but, at 8k the 2.5 is moving the same amount as the 2.0 at over 10k.
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Old 02-09-2004, 10:27 PM   #41
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Quote:
Originally posted by kgb
If you retain your heads from your EJ251 and use the EJ22T shortblock, you get a really low CR (7.7:1 with SOHC heads) but with the EJ255/EJ257 you get a more favourable CR of around 8.48:1
Wait, so if I take my stock heads and put them on an EJ257 shortblock, I'll have a 7.7:1 CR? If so, that really sucks.
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Old 02-09-2004, 11:25 PM   #42
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I think it would be about 8.5:1
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Old 02-10-2004, 12:38 AM   #43
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Quote:
Originally posted by Layman
Wait, so if I take my stock heads and put them on an EJ257 shortblock, I'll have a 7.7:1 CR? If so, that really sucks.
Do a search on Xephyr (Marc Rameriz). He used to run an EJ22T with DOHC EJ251 heads. And he had 7.5:1CR. And he ran 23-25psi on a daily basis with over 300hp to the wheels. If tuned right, along with a custom turbo, like he had, it is very powerful, and very streetable. But such a build is not for your basic lackey mechanic. Subaru's may be like Lego's, but just because they bolt together doesn't automatically make them good or bad...
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Old 02-10-2004, 01:50 AM   #44
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Alright let me get this right....

The ej257 STi motor and ej255 xt motor has a 8.2:1 CR, with wrx heads they have 8.48:1. With RS heads they wont have the same as the 2.2.... but I dont remember what they will have.
I dont know the 7.5:1 CR just means turn up the boost to me...
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Old 02-10-2004, 11:04 AM   #45
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Quote:
Originally posted by totoherbs
Alright let me get this right....

The ej257 STi motor and ej255 xt motor has a 8.2:1 CR, with wrx heads they have 8.48:1. With RS heads they wont have the same as the 2.2.... but I dont remember what they will have.
I dont know the 7.5:1 CR just means turn up the boost to me...
Sorry if I confused. I drew the example of Marc's engine to emphaisze that the CR is a non-issue if you know how to tuen your car. The EJ257 w/RS heads will be in the mid 8's...
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Old 02-10-2004, 04:28 PM   #46
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That's what I read - EJ257 shortblock with RS head is about 8.5:1, with WRX head is a bit higher unless you swap the pistons, and EJ22T with RS head comes to about 7.7:1
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Old 02-10-2004, 09:34 PM   #47
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Quote:
Originally posted by kgb
That's what I read - EJ257 shortblock with RS head is about 8.5:1, with WRX head is a bit higher unless you swap the pistons, and EJ22T with RS head comes to about 7.7:1
Okay. So just to confirm, if I take a ej257 shortblock and slap on my stock RS SOHC heads, I'll have a CR of 8.5:1? I can certainly live with that.
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Old 02-11-2004, 01:47 AM   #48
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Quote:
Originally posted by Matt Monson
Sorry if I confused. I drew the example of Marc's engine to emphaisze that the CR is a non-issue if you know how to tuen your car. The EJ257 w/RS heads will be in the mid 8's...
Wasnt you.... I think I confused myself.

Quote:
Originally posted by Layman
Okay. So just to confirm, if I take a ej257 shortblock and slap on my stock RS SOHC heads, I'll have a CR of 8.5:1? I can certainly live with that.



Sounds right but to make sure, it has been posted in other places if you want to dobble check.

This thread and a few other I think....

http://forums.nasioc.com/forums/show...&pagenumber=10

http://forums.nasioc.com/forums/show...hreadid=352136
Heres the thread matt was talking about.
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Old 05-31-2010, 11:02 PM   #49
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Quote:
Originally Posted by totoherbs View Post
the ej255 = xt motor ej257 = sti motor

cams are the only difference... and yes you can change it from fly by wire BUT that would be crazy amount of work. You would have to rewire eveything with like a v7 harness and I dont know what the hell you would do for an ecu... would the v7 ecu work with the 2.5 block?
I don't know about the cams, but the pistons are different according to wikipedia (I know, not the most reliable, but usually pretty good).

http://en.wikipedia.org/wiki/Subaru_EJ_engine
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