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07-25-2009, 11:06 PM | #1 |
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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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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 |
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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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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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 |
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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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 |
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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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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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 |
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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08-05-2009, 10:48 PM | #12 | ||
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Quote:
7800ish is redline on my v3 cluster... was that a typo on your part Jaxx? Quote:
v3 v4 |
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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 |
08-06-2009, 06:47 AM | #14 |
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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 |
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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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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08-06-2009, 05:49 PM | #18 |
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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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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 |
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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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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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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08-10-2009, 11:01 PM | #24 |
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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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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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