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Old 07-25-2009, 11:06 PM   #1
subyboy
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Default ej20k wrx and STI differences?

I have a Ver. III wrx engine and I was wanting to know if there were any differences in like the cams and what not. I know that the STI has better torque than the wrx and a different turbo but what else? Thanks in advance.
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Old 07-25-2009, 11:21 PM   #2
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this is probblay typed up in here some where

higher red line 8750 vs 8220
different valve shim system
the vf23 (sti) has a smaller exhaust housing on the turbo
same injectors
more agressive tune
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Old 07-26-2009, 12:59 AM   #3
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Same power but STI has more boost in midrange for more torque. I believe the WRX has a rev limit of 7500 rpm marked on tacho.
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Old 07-26-2009, 01:00 AM   #4
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^^STi EJ20K's reved to nearly 9k???!! ****, I'll swap the 20g out of my WRX next month if this is true, I have a 20K out of an STi Type R sitting in my storage area in case the 20g let's go.
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Old 07-26-2009, 10:46 AM   #5
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8250 is beginning of redline on the tach V4 STi fwiw. it readily likes to go above 8250(just won't produce any more power there).

from about 3-3.5k RPM on up to 8000 it has some warp speed feel to it in a 2500# L! i ruined a couple porsche drivers days. im going to do it again asap!

--keith
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Old 07-27-2009, 07:53 AM   #6
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So when I set the rev limit to 8750 the engine will turn it no problem?
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Old 07-27-2009, 08:21 AM   #7
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it makes no power there usually. turn it down to 8K and save your engine a little uneeded stress. if somehow your making power past 8K while tuning, go up a little to 8500 or where it seems to taper off. imo 8k is enough rev room to make useable power

--keith
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Old 07-27-2009, 11:53 AM   #8
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Yeah I don't think the 20K will hold together at all at much above 8300. I would almost tear the 20G out of my WRX to test it if it wasn't a giant waste of an engine.
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Old 07-31-2009, 01:35 PM   #9
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Holy crap that's a high rev limit for a boxer, 8K is just ridiculous. I wouldn't go anywhere near there unless i was running race gas here in the US. wow just wow.
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Old 07-31-2009, 01:57 PM   #10
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Bah, I run mine to 8k on 91oct.

My STi cluster, V3-4, the redline starts at about 7950, an fuel cut isnt much after that.

Sti's have different internals to I believe. forged I believe
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Old 08-01-2009, 04:18 AM   #11
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Only forged pistons the weak parts are the rods (or more specific: rod bolts) and they are standard.
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Old 08-05-2009, 10:48 PM   #12
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Quote:
Originally Posted by Jaxx View Post
this is probblay typed up in here some where

higher red line 8750 vs 8220
different valve shim system
the vf23 (sti) has a smaller exhaust housing on the turbo
same injectors
more agressive tune
i thought fuel cut was 8250 and thats as far as it was recommended to go. ive never heard anything about 8750

7800ish is redline on my v3 cluster... was that a typo on your part Jaxx?
Quote:
Originally Posted by kheff46 View Post
8250 is beginning of redline on the tach V4 STi fwiw. it readily likes to go above 8250(just won't produce any more power there).

from about 3-3.5k RPM on up to 8000 it has some warp speed feel to it in a 2500# L! i ruined a couple porsche drivers days. im going to do it again asap!

--keith
shows the same around 7800 to me

v3


v4
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Old 08-06-2009, 04:57 AM   #13
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My Version 4 STI (apparently stock, grey import to UK) also has a redline of 7800 or so. The previous owner admitted to having accidentally revved to 8500 in a low gear, presumably the fuel cut didn't have time to kick in.
Also mine definitely has the VF24 turbo, which I thought was normal for sedan STIs.

Last edited by thoughto; 08-06-2009 at 04:59 AM. Reason: Remebered something
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Old 08-06-2009, 06:47 AM   #14
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Quote:
Originally Posted by DHRDAN View Post
Holy crap that's a high rev limit for a boxer, 8K is just ridiculous. I wouldn't go anywhere near there unless i was running race gas here in the US. wow just wow.
hahaha, let me take you for a ride on 93oct and I'm quite sure you'll change your mind.
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Old 08-06-2009, 09:24 AM   #15
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elislider- is that a V4? i assume it's a DCCD version by the vertical light bar in the middle. mine is similar STi but not DCCD version. and you are correct 7800-7900 redline. fuel cut stock was 8250(i was typing too fast) and is obviously not there on mine as i've been 8500+ a couple times.

--keith
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Old 08-06-2009, 09:58 AM   #16
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Something to keep in mind is that the RPM where the fuel cut is located is not necessarily where the engine will stop accelerating. My 2.5RS has a fuel cut at 6250. If I approach it slowly it will cut out right at 6250. Given the mods I have done to it, if I hit it at full throttle with the engine wide open on acceleration it actually spins up to nearly 6500rpm before it starts to drop back down. I suspect those of you revving to 8500rpm are seeing the same thing where the momentum of acceleration of the engine itself is carrying it past the fuel cut even though fuel was in fact cut at a lower rpm.
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Old 08-06-2009, 04:28 PM   #17
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Yes fuel cut in lower gears may seem/be higher than in higher gears, I doubt you will reach higher rpm's in 3/4/5th.
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Old 08-06-2009, 05:49 PM   #18
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Quote:
Originally Posted by Marnix View Post
Yes fuel cut in lower gears may seem/be higher than in higher gears, I doubt you will reach higher rpm's in 3/4/5th.
no kidding. 8500 in 5th would be like 180mph
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Old 08-07-2009, 02:51 AM   #19
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Well a friend of mine has done about 7K rpm in fifth (175 mph) with his MY92 Legacy Turbo with EJ20G (chipped to 1.2 bar). It was on a downhill stretch of Autobahn though. Afterwards he said he never wanted to do that again.
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Old 08-07-2009, 09:47 AM   #20
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i was never 8500 in 5th! but 1-4 sure and i had done a slow roll through it(fuel cut/redline), and plenty of quick trips upto and beyond it. it seemed to have fuel still, no actual cut i could notice, and i didn't want to do damdge, so i backed off. mine has a SYMS tuned ECU, so it's could be higher i assume. im not hip on frequent trips past 8K fyi.

--keith
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Old 08-09-2009, 05:04 PM   #21
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Can we get back on track with trying to find out the differences between the ver. III wrx and sti?
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Old 08-10-2009, 01:16 AM   #22
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Jaxx already summed it up pretty much (as far as engine stuff) i only was trying to clear up what he said about 8750 must have been a typo and its around 7800 for redline and 8250 for fuel cut... at least thats everything ive heard/seen/been told. that having been said the jdm wrx and sti tachs do go to 9k...
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Old 08-10-2009, 09:21 PM   #23
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So the WRX and STI are basically the same thing but engine tuning and the turbo? If so thats' pretty cool. I had heard that the STI had sodium filled valves, would the WRX have them as well?
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Old 08-10-2009, 11:01 PM   #24
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Quote:
Originally Posted by subyboy View Post
So the WRX and STI are basically the same thing but engine tuning and the turbo? If so thats' pretty cool. I had heard that the STI had sodium filled valves, would the WRX have them as well?
did you read at all? the heads are quite different, and thats where the big differences are yeah. heads, turbo, ecu. but there are lots of other differences from internals to interior trim to TMIC to fog light covers etc etc
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Old 08-11-2009, 12:17 AM   #25
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The WRX EJ20K also has the sodium exhaust valves, same springs slightly different cams and shim over buckets instead of shim under buckets.
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