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Old 04-14-2005, 09:35 PM   #1
mistaboosta
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Default For a higher rev limit

Hi,

I own a edm 2004 WRX. It has the shimless style buckets.

what else do i need to have in order to rev to higher rpms?
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Old 04-14-2005, 10:45 PM   #2
ride5000
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engine management?
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Old 04-14-2005, 10:53 PM   #3
perkowskiforpope
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valve train upgrade i think?
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Old 04-15-2005, 02:08 AM   #4
ebeck
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How about cams that actually make power at a higher rpm. I mean you can always cram more air and timing using big turbos and Utec's. It does work though. I believe your top end is designed to produce power till 5.5K then it falls off. There are cams that actually deliver a powerband up into the 9K range. Course you loose some down low....

Good luck!
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Old 04-15-2005, 03:01 AM   #5
santofontana
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Im curious to know what else you need besides the shimless buckets to run wrx heads to 8k safely. Does it take springs? I know about the cam drawbacks.

Edit: Axis seems to feel the springs and retainers are needed.

Last edited by santofontana; 04-15-2005 at 03:08 AM.
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Old 04-15-2005, 08:58 AM   #6
Davenow
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With the shimless buckets you can bump the redline up at AT LEAST 7500rpm safely. All you need is EM that will allow you to change your redline.

I would be a little nervous about an 8k redline with stock springs, but if you have stock cams you should probably be ok.

The thing is, without a different turbo, you arent doing yourself any favors with an 8k redline, as your turbo is well out of breath before even 7k anyway.
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Old 04-15-2005, 09:31 AM   #7
mistaboosta
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I have a gt30-11 turbo, and port polished wrx heads. I think I'm gonna go with the Crower Stg3 or Stg4 cams. I'm running AEM for EM. The crawford R1 motor (2.4) is also readily waiting to be installed.

So if I go with the Axis single spring upgrade am I done for 8500 redline ???




Edit: Forgot to tell that the turbo is now rotated and no more maf.
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Old 04-15-2005, 09:45 AM   #8
subieworx
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I have run up to about 7650 using the STX map on my AP. It revs very high, but as others have said there is no more power up there. you would be better off shifting to another gear and getting back into the powerband than to run the RPMs that high.
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Old 04-15-2005, 01:21 PM   #9
mistaboosta
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you don't read or what???
I have the necessary parts that will grant me power up there.
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Old 04-15-2005, 02:32 PM   #10
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Sorry I thought you said you were going to get that. Didn't realize you already had it. Chill out, simple mistake.
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Old 04-15-2005, 02:57 PM   #11
santofontana
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Quote:
Originally Posted by Davenow
With the shimless buckets you can bump the redline up at AT LEAST 7500rpm safely. All you need is EM that will allow you to change your redline.

I would be a little nervous about an 8k redline with stock springs, but if you have stock cams you should probably be ok.

The thing is, without a different turbo, you arent doing yourself any favors with an 8k redline, as your turbo is well out of breath before even 7k anyway.
I would think with the higher lift of stock wrx cams you would be more prone to float than with something with less lift and more duration.

I wonder if theres any older 8k rpm cams with no avcs that came on earlier jdm stis.
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Old 04-15-2005, 04:06 PM   #12
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Quote:
Originally Posted by mistaboosta
you don't read or what???
I have the necessary parts that will grant me power up there.
Last I read you didint have cams to support it. Not only that but insulting someone like you did isn't gonna get you any help at all.

Quote:
Originally Posted by mistaboosta
I think I'm gonna go with the Crower Stg3 or Stg4 cams.
Yup, yup....I was right....you dont have the necessary parts. Why don't you try the Honda forums....might be more helpful to a person like you. They're your kind of people
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Old 04-15-2005, 04:30 PM   #13
mistaboosta
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SSFWRX - 1st of all the message wasn't for you. It was just for "subieworx" coz by the time he posted his message, i had already posted the basic mods of my car.
2nd I didn't want to be rude, i didn't mean no offense - it was just playing around. Maybe I should use some smileys to express myself better. Sorry man I didn't mean to break your heart

subieworx - By the time I posted that message I was a bit nervous because of some health problems of my father so I used the wrong words in the wrong order. Apoligizes if I pissed you off man. I didn't want to be rude at all. Especially when people are trying to help me by suggesting things about my questions.


So back to the subject now, Are the single spring upgrade from AXIS enough to rev 8500 rpms safely?
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Old 04-15-2005, 04:34 PM   #14
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ok well since we kissed and made up I suggest double valve springs. The higher the revs the greater the chance of floating a valve. That could potentially be catastrophic. 8500RPM is alot to ask of a subaru honestly...my Ver 8 likes 8k, but Im scared to take it much past that.
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Old 04-15-2005, 06:03 PM   #15
mistaboosta
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I'm glad that we made up

so, how much are these double valve springs and do I need anything like retainers etc. in order to make double valve spring upgrade?
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Old 04-16-2005, 04:27 AM   #16
02Toyowrx
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My heads are at DPR getting a stage 2 port and polish, I have a mildly built ej20 with stock cams. They suggested their pcs valvetrain kit. For my application, I am changeing my redline to 8200. They said this setup will handle 8500+.
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Old 04-16-2005, 12:39 PM   #17
mistaboosta
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I checked at DPR's website. They seem to have a lot of products for Subaru. I've never heard of them but they seem to be a serious company.


Any comments about DPR??? I'm leaning to buy Double spring and ti retainers from them.
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Old 04-16-2005, 01:28 PM   #18
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Quote:
Originally Posted by mistaboosta
I'm glad that we made up

so, how much are these double valve springs and do I need anything like retainers etc. in order to make double valve spring upgrade?
1.double valve springs
2.titanium retainers "to be safe"
3.stainless steel valves "oversize or not"
4.headshave "for higher compression"
5.forged pistons

and EMs to support all your needs

goodluck!
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Old 04-17-2005, 04:46 PM   #19
mistaboosta
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ok then, i ordered DPR oversized nitrite coated steel valves, single springs, ti retainers, Crower Stg 3 Cams, DPR Phase 3 port polish job.


i guess this will be enough to handle 8500
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Old 04-17-2005, 06:19 PM   #20
PeteDucati
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Dude.. what does Crawford say about revving their 2.4 that high? Reason I ask is 'cause the one on their site with the SR50 is sporting a dyno sheet that ends at 6750rpm. And I've always been under the impression that the "stroker" Subaru motors can not be revved too much past 7k. For your sake PLEASE call Crawford before DPR ships your goodies, it would suck if that motor isn't designed to rev high enough to take advantage of your new valve train.
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Old 04-18-2005, 07:03 AM   #21
mistaboosta
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I talked with Chris about their motor many times. They said that it was capable of 9000rpm safely. I guess there won't be any problem with the block itself.


edit: I'll open up a topic about this and hope someone from Crawford to chime in.
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