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Old 04-24-2002, 01:49 PM   #1
STiTuner
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Default Q for those running Stock WRX turbos on RS's

[anti flamatory suit] ALREADY SEARCHED [/anti flamatory suit]

Just out of curiousity I was wondering what boost levels every one is running with Stock WRX turbos. Has anyone tryed to push the turbo with 8-9 psi?

I just want to see iif anyone has tryed to max it out. and what you got from it in terms Boost levels including spikes and surges.

Brad
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Old 04-24-2002, 07:37 PM   #2
inpreza kid
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the stock internal wastegate in the wrx turbo bleeds around 8psi. i'm not sure how to get around this to run lower boost. i'm sure this turbo has no problem pushing 13psi.
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Old 04-24-2002, 10:47 PM   #3
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Can't tell you what boost I'll have, but I've disabled the internal wastegate and am using a Tial external unit on my project. We hope to have it running by the end of the coming weekend.

Cheers! John
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Old 04-25-2002, 03:09 AM   #4
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FWIW cranking up the boost on an already undersized turbo is just going to make it trow more heat increasing your risk of detonation...i would push it harder then the factory wastegate...it'll already be strugglin.

jeremy
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Old 04-25-2002, 08:17 AM   #5
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FWIW, I'm not planning on running a high amount of boost on the WRX turbo. Although WRX owners are cranking up there boost a bit without any major problems.

Cheers! John
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Old 04-25-2002, 09:28 AM   #6
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but basically this turbo COULD hold about 9 psi for a short bit if If necessary too?just debating on where to put my scramble boost

also you said your wastegate was bleeding at 8 psi? to you have your bypass and its just putting that much pressure on the plate or are you using the spring from the wastegate?

Brad
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Old 04-25-2002, 02:48 PM   #7
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What the deal with the REX's producing 14 psi then if the wastegate is stepping in at 8 psi?

Graham
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Old 04-25-2002, 02:54 PM   #8
inpreza kid
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STiTuner i don't have the turbo installed yet. still working out the up and down pipes.

the stock wrx wastegate is set to go off around 8psi. the wrx has some sort of boost controller to raise the boost level to 14psi in some gears. i think i'm probably going to run a external wastegate. too much work to get the stock internal one to work right.
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Old 04-25-2002, 02:54 PM   #9
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Quote:
Originally posted by Graham
What the deal with the REX's producing 14 psi then if the wastegate is stepping in at 8 psi?

Graham
there is a restrictor in the hose between the wastegate and boost control solenoid which allows the boost to hit 14psi.

jeremy

what do you think an MBC or EBC does??
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Old 04-25-2002, 03:27 PM   #10
inpreza kid
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have you guys considered getting a wrx turbo and sending it to forced performance to modify it? i'm thinking about it but not sure.
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Old 04-25-2002, 10:09 PM   #11
Graham
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Don't know Jeremy, never dealt with a MBC or EBC before.

Guess I should have known that, since its so apparent that internal wastegate doesn't do all the work.

Graham
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Old 04-25-2002, 10:55 PM   #12
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FWIW(although there has been another WRX turbo in RS thread), I'm using up and down pipes from www.uniquemotorsports.com. I'm disabling the stock internal wastegate and using a Tial 35mm external wastegate. Waiting for the wastegate flanges to be welded on-should have the parts by Saturday, and then I'll be back under the car.

Chad's pipes do away with swapping the stock crossmember, although with an auto tranny(like I have), the up pipe has to be lengthened horizontally about half an inch so that the down pipe doesn't hit on the tranny bellhousing.

Also, the exhaust housing of the turbo had to be rotated, requiring the use of a large pair of snap ring pliers-I had to have my mechanic do it. There are some pics on my website at www.lastditchracing.net. Not great pics, but I hope to have better ones soon.

Once I get it running, I'll post a report of boost level and driveability. I don't know if anyone actually has a WRX running in their RS yet.

Sorry if I wandered a bit off topic-didn't mean to!

Cheers! John
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Old 04-25-2002, 11:28 PM   #13
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if you are just talking about the turbo and not the motor i dropped 16lbs the other day at the track with 104 octaine the other day. as far as 91 octaine goes i have run 13 on the street.
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Old 04-26-2002, 08:43 PM   #14
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AND what have you done to you motor?

are you using a 2.5l motor?

Brad
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