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Old 09-29-2004, 06:47 PM   #1
t3hWIT
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Question how high can i actually rev?

ok. going through a somewhat recent post i found out that my ej22 has forged rods. and that the thing is a tank.

my redline is 6k. or maybe 6250k. i dunno

but could i safely rev higher than that? like maybe 6500? or should i just leave well enough alone and listen to the subi techs? ive done no internal mods, btw.

one more thing. at about 5k this ringing noise picks up under the hood. some technician at a subi dealership (not where i bought it, nor had work done, nor was i calling for anything too intelligent) said it was the metal heat shield crap on my headers. im taking them off. im just wondering if itll harm nething if i do(i dont see why it would but i want a 2nd opinion)

yeah i know. this isnt a very important post but i couldnt find a more sutable place for it. and yes, i know i post alot of these sorta pointless posts but im still wonderin

-shaun
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Old 09-29-2004, 06:55 PM   #2
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Quote:
my redline is 6k. or maybe 6250k
I wouldn't recommend going above the redline, obviously. Our little 2.2's don't make much power up there anyway. Before you go tearing out heatshields, try checking under the car to see which one(s) are rattling. I just hacked up the heatshield above the muffler, but haven't took any others off much less the one that wraps the exhaust manifold.

-Charles-
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Old 09-29-2004, 10:19 PM   #3
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Of course, I take no responsiblity for what you do w/ your car. That being said... Subaru motors are pretty damn resistant to damage from high revs.

I've hit ~8500 in my gf's 270k miles Loyale before.

Runs fine... but then again it's a EA, not EJ series motor.

YMMV

Last edited by jamesfacts; 09-29-2004 at 11:07 PM.
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Old 09-29-2004, 11:04 PM   #4
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Quote:
Originally Posted by americanyouth
Subaru motors are pretty damn resistant to high revs.
you mean they don't like high revs?

or you mean they're resistant to damage from high revs?

also, are you basing your judgement on anything other than that one car?
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Old 09-29-2004, 11:09 PM   #5
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I meant that they resist damage at revs very well.

And, while I have experience w/ other high-revving subarus, they are all EA motors.

PM subafreak and ask him about his RX sometime. IIRC, he held it to about 8k for well over 2 minutes in a burnout competetion before he finally threw a rod.

He said the motor still could have run on 3 cylinders, btw, if it wasn't for that hole in the intake manifold
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Old 09-29-2004, 11:10 PM   #6
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i got a 2.5 rs and well i got to the redline and it will go a little farther than 6,300 but that was by aciddent. highway driving + new driver = not enough experience. woot woot it's been 6 months since my license and no aciddents yet! sorry im just happy in still alive.
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Old 09-29-2004, 11:17 PM   #7
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Sure you can rev your motor to 8k if you wanted to But the redline is there for a reason. Stock setup and the good ole' short stroke of the EJ, you'll lean out very soon anything over or around redline for that matter.

We really don't need to rev our engines that high for more power if that is what your are looking for.

As for the heatshields, they are there for a reason (again). To keep hard debris, etc., and especially water off of the exhaust. Combination of hot exhaust and water can ruin the exhaust piping. In addition, there has been cases of people catching stuff on fire such as dry grass and leaves. But that is a rare case, unless you travel across a lot forests and non-paved roads.

The EJ22 is a great engine, one of the best Subaru has ever built. But, it's not a performance tank. It's a tank by comparasion in terms of reliability.

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Old 10-01-2004, 02:27 PM   #8
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ok. well heres what ill do. ill hunt down the ringing heatshield and ... uh... eliminate it.

as far as revving goes...

theres no real reason for me to do it other than for the high revving noise. i know the hp stops at 5400 and the torque at i believe 4300. yeah. its for noise. sorry if ne1 feels like ive wasted their time but i just the sound of the high revving motors.

which is why im loningfor a crotchrocket
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Old 10-01-2004, 02:32 PM   #9
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basically i was wondering if it can be safely revved at 7 or god forbid 8k rpm. i know the redline's there for a reason but i thought maybe the subi dudes who set it at that were p*s*yz.

so...
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Old 10-01-2004, 03:08 PM   #10
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I was on the highway a while back in my 93 Impreza 1.8 and I was going from 3rd to 4th at 85mph and put it into 2nd instead. The car reved to 8k and it felt like i had hit a brick wall. I pushed in the clutch and went on about my day. Accidents happen, this is the reason I drive a Subaru.
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Old 10-01-2004, 04:54 PM   #11
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Quote:
Originally Posted by mi_cistemz_loudr
ok. going through a somewhat recent post i found out that my ej22 has forged rods. and that the thing is a tank.

my redline is 6k. or maybe 6250k. i dunno

but could i safely rev higher than that? like maybe 6500? or should i just leave well enough alone and listen to the subi techs? ive done no internal mods, btw.

one more thing. at about 5k this ringing noise picks up under the hood. some technician at a subi dealership (not where i bought it, nor had work done, nor was i calling for anything too intelligent) said it was the metal heat shield crap on my headers. im taking them off. im just wondering if itll harm nething if i do(i dont see why it would but i want a 2nd opinion)

yeah i know. this isnt a very important post but i couldnt find a more sutable place for it. and yes, i know i post alot of these sorta pointless posts but im still wonderin

-shaun
I got my 1995 Legacy up to about 7,500 rpm on more than one occasion. I, however, do not suggest doing so. Going past redline witht he stock valve springs will cause damage. If you upgrade the valvetrain, possibly get a new camshaft, or get a better head, you should be able to go to 10,000 rpm safely on stock piston heads, rods, and crank.

Edited to include emphasis. Also, just remember, if you do something stupid to your car, and you end up frying the engine, you can always swap in an EZ30...

Second edit: IIRC, the 'stock redline' on the 2.2 liter engines is simply imposed because, when stock, those engines really don't make ANY power past 5,750 rpm anyway. If you upgrade the camshaft and valvetrain, as I said, you should increse your redline, because you won't get all of your powerband if you don't. Also, EJ20 heads (IIRC) breate better than the stock heads, so you could do a swap there. That right there would be good for a nice increase in powerband.
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Old 10-01-2004, 06:37 PM   #12
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What Chi_San said.
The rods and the bottom end are not the limiting factor here. The valvetrain is the liming factor. IF you were to build your heads with upgraded vavlesprings and a full Pnp along with valve job, THEN you could rev to 7500 or 8000 rpms. BUT you would still need to upgrade your fuel system AND get higher compression pistons before the rpms will be of any value...

p.s. Anything is not spelled "nething". Nothing personal, but I have always thought is lame and makes the thread harder to read and understand when people try and type all 8 mile 'n sh1zzy...
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Old 10-01-2004, 07:20 PM   #13
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A7 13457 175 3a213R 700 R34|) 7|-|4|\| 1337....

(At least it's easier to read than 1337....)

IIRC, all Subaru engines, other than the 6 cylinder ones, can take quite a few RPM. The 2.7l has a stock redline of 6,500? The 3.3l has a redline at 7,000... And the EZ30 has a redline at 6,000, IIRC. Just about any subaru engine can be built to take higher RPM, it just has to breate faster or better.

Uh, while on this topic, how exactly do you raise the redline? Is there an ECU reflash, or do you have to get something like a UTEC and use an NA map or what?

Also, compression ratio doesn't effect the usability or a higher redline, actually. A higher CR will give you more bang for the buck, though. A higher CR with the same powerband would still make more torque and more horses than stock CR, but the fall off at the end of the powerband would be the same, if not worse.
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Old 10-01-2004, 08:09 PM   #14
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Chi_San,
No, CR does not effect the usability of a higher redline, but I gave the guy the benefit of the doubt and assumed that he wanted to raise his redline because he wanted to make more power, and not just to rev like a Honduh. And as such, the higher CR would do that in conjunction with the reworked heads, that obviously should include new cams as well. I consider it required for any real build, but no, it is not required just to rev more. All he needs to rev more is stronger springs and a raised redline.

And you can raise the redline on the 1.8l ECU's by changing the clock unit inside the ECU. I have not done this myself as I don't have a 1.8, but a freind of mine did it on his 1.8l w/ and EJ25 swap...
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Old 10-01-2004, 09:22 PM   #15
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isnt there a rev-limiter?
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Old 10-02-2004, 12:09 AM   #16
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Chi San , there is no way you can rev to 10000 k with just upgraded valvetrain and some cams. I don't see a reason to rev that high anyway. Subarus arn't hondas. With upgraded valvetrain and some cams to bump up the power band, i would go to 7500 max.
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Old 10-02-2004, 01:40 AM   #17
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Quote:
Originally Posted by Matt Monson
Chi_San,
No, CR does not effect the usability of a higher redline, but I gave the guy the benefit of the doubt and assumed that he wanted to raise his redline because he wanted to make more power, and not just to rev like a Honduh. And as such, the higher CR would do that in conjunction with the reworked heads, that obviously should include new cams as well. I consider it required for any real build, but no, it is not required just to rev more. All he needs to rev more is stronger springs and a raised redline.

And you can raise the redline on the 1.8l ECU's by changing the clock unit inside the ECU. I have not done this myself as I don't have a 1.8, but a freind of mine did it on his 1.8l w/ and EJ25 swap...
ahem.....clock unit you say? Any pics of this and percent chance ill jack up my ECU?
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Old 10-02-2004, 02:31 AM   #18
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Quote:
Originally Posted by CHris73D
Chi San , there is no way you can rev to 10000 k with just upgraded valvetrain and some cams. I don't see a reason to rev that high anyway. Subarus arn't hondas. With upgraded valvetrain and some cams to bump up the power band, i would go to 7500 max.
I have seen valvetrains that can go up to 9,500 rpm, and some users on this forum have reported going up to 11,000 rpm on stock internals with a valvetrain upgrade and cams without any problems as result. This is of course during deceleration. Unless you had a really big turbo, having an effective 10k redline with the powerband topping out just under that is almost impossible. Axis shortblocks that have been built, and that are FI, often go up to 9,500 for their redlines. Also, even though the powerband ends at 9,000 rpm, it doesn't mean that the engine can't spin up to 10k. It probably will take a long time for it to get that high, though.

Quote:
Originally Posted by Matt Monson
Chi_San,
No, CR does not effect the usability of a higher redline, but I gave the guy the benefit of the doubt and assumed that he wanted to raise his redline because he wanted to make more power, and not just to rev like a Honduh. And as such, the higher CR would do that in conjunction with the reworked heads, that obviously should include new cams as well. I consider it required for any real build, but no, it is not required just to rev more. All he needs to rev more is stronger springs and a raised redline.

And you can raise the redline on the 1.8l ECU's by changing the clock unit inside the ECU. I have not done this myself as I don't have a 1.8, but a freind of mine did it on his 1.8l w/ and EJ25 swap...
Ahh, okay. Honestly, though, just upgrading the cam will help it breate better, and while it may not be a great build, it will increase the number of horses the engine makes. IIRC, someone in this forum some time ago posted that an RS with just a camshaft was making as much WHP as a WRX did (on the same dyno).

If you really want to get into high power, high reving setups, you have to go the entire 9 yards. Fuel delivery including rails, engine management, proper tune, correct fuel, right pistons, custom heads, racing profile camshaft, etc. You can't just stick new valves in it and expect it to make power right to 8k rpm. With a Cobb racing profile cam, upgraded valvetrain, high CR head, Pnp, and aftermarket engine management, you can very easily have a Subaru with a powerband that tops out at 9,500 rpm or higher. When you add a turbo into the mix, things just get sweeter.
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Old 10-02-2004, 03:51 PM   #19
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hehehe... hrm... well after my last post, about 30 minutes later i took the car for a run. i was between redlights and was gonna rev it to 7k once. just once. to see what happens. well the light turned green, i let it rip, and then at approsimately 6500, but not on the dot, it felt like someone just gave my car a huge friggin kick. like the car jumped, the rev needle jumped down, and the engine died down.

scared the crap out of me. i thought these things dont have revlimiters? a buddy mentioned something like maybe the flexplate(i have a slushbox if that means anything) i mean i drove away like nothing happened but man... the car jumped... jeezuz...

it almost felt like it did when the speed govenor shut it down on me this one time. 117 in the 2.2 baby(the guy at Fairway Subaru never heard of one hittin that speed). but it didnt feel like that then. and this "kick" didnt happen at an exact mark. it was between numbers and marks.

i go to work in an hour. when i go ill rev it in neutral to 7k and see what happens. maybe itll actually let me. maybe something will break. maybe not. well neways this is my last post probably til monday. my computers really slow and it took me 20 minutes to write this crap.

-shaun

We tweak. We build. We blueprint. We spray. We bend. We torque. We port. We polish. We put on. We take off. We beef up. We lighten. We modify. We fabricate. We make noise. We silence. We lower, boost, and race. We do these things to cars most people thought were perfectly fine when they rolled off the lot. And why do we do it? Because we can.
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Old 10-02-2004, 05:56 PM   #20
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Chi_San
Show me the post of the person claiming that performance! I am one of the only people around here who has recently posted dyno numbers, and the other guys that have had re-worked heads. I have intake and full exhaust and cams and make 18hp at the wheels less than a WRX. Don't spread urban myth unless you can proove it is fact...
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Old 10-04-2004, 08:23 PM   #21
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crickets...
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Old 10-05-2004, 12:55 AM   #22
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Quote:
Originally Posted by Matt Monson
crickets...
Gee, sorry, the post was a long time ago, I just got bumped up to 50 hours a week, and my life really sucks ass. I don't have 4 hours to go searching for a thread right now.
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Old 10-05-2004, 01:07 AM   #23
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valve float bad
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Old 10-05-2004, 03:37 AM   #24
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There are rev limiters on 97 Impreza's? I've taken my (Stock except for CAI) 93 to 140 over a patch of ice. I have a Legacy tranny though. Still the speed govenor is utilized by the ecu right?
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Old 10-05-2004, 09:55 AM   #25
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I know of some guys wanting a few extra rev's because of autocross reasons, ust topping the gear and hit rev limiter, but have o need for third gear. for them I would recommend bumping it an extra 200 rpm's or something but just because you want the high revving sound, leave it alone.
just my $.02, Micah
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