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Old 04-19-2004, 10:58 AM   #1
squirrelmasta
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Default tial springs

Sound kinda like a n00b question here. but how do you change a stoke WRX turbo to run 5 psi instead of 15? tial spring i'm assuming? if so, where do you get them. i remember people talking about different colored ones. and how do you go about changing it. Thanks.
-Eli
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Old 04-19-2004, 11:57 AM   #2
kaos200
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well, you could just disconnect the boost controller, it would run 7-8psi, but to do 5? you'd have to change out the actuator itself, or if you could manage to heat the crap out of the actuator (that would weaken the spring)
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Old 04-19-2004, 01:40 PM   #3
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The stock wrx turbo runs about 8psi without a boost controller. You can open up the actuator a bit by lengthening the arm and you could probably get lower boost - but no guarantees.

-Charlie
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Old 04-19-2004, 02:59 PM   #4
ilmaestro
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I too am wondering, does anyone know where springs for the 35mm Tial wastegates can be purchased from? I've had no luck so far.
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Old 04-19-2004, 03:12 PM   #5
Drac9
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http://linux.forcedperformance.net/m...Code=UNIV-TiAl

they appear to have them. Btw- Google is cool
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Old 04-19-2004, 05:39 PM   #6
ilmaestro
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Quote:
Originally posted by Drac9
http://linux.forcedperformance.net/m...Code=UNIV-TiAl

they appear to have them. Btw- Google is cool
As far as I know, most wastegate springs are model specific, and I am having a hell of a time finding some for the standard 35mm model, let a lone, a .3 bar spring. Google hasn't helped much in this respect.

j

Last edited by ilmaestro; 04-19-2004 at 06:18 PM.
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Old 04-19-2004, 06:55 PM   #7
Drac9
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If you contact them they will sell you the spring for your model. It looks like you can get the .25bar spring for $25
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Old 04-19-2004, 07:35 PM   #8
phattyduck
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You can only use the Tial springs on a Tial wastegate. The spring for the WRX wastegate actuator is internal and not removeable. You are stuck running 7-8psi or higher with the WRX turbo and actuator. You might be able to find a weaker actuator (maybe for a T3 turbo) and modify it to fit... but there are definitely no guarantees with that...

-Charlie
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Old 04-19-2004, 07:46 PM   #9
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is this for the 2.5RS?
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Old 04-19-2004, 09:07 PM   #10
Matt Monson
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You could also get a VF-10 off of a USDM Legacy turbo. It is a slightly smaller turbo and it runs 6psi on just the spring...
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Old 04-19-2004, 09:45 PM   #11
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last thing he needs is a smaller turbo. Stock WRX turbo is deemed as too small by many professionals (real and self acclaimed) due to the tiny size of the turbine. Supposedly it increases detonation by increasing backpressure which reduces the effectiveness of the valve overlap's scavenging/purging effect.

Also, the tiny turbo will heat up the intake charge excessively because it's working outside of it's efficient ranges. That adds excessive heat to the engine that wouldn't be there with a properly sized turbo.
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Old 04-20-2004, 06:54 PM   #12
Matt Monson
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Quote:
Originally posted by ImprezaRSX
last thing he needs is a smaller turbo. Stock WRX turbo is deemed as too small by many professionals (real and self acclaimed) due to the tiny size of the turbine. Supposedly it increases detonation by increasing backpressure which reduces the effectiveness of the valve overlap's scavenging/purging effect.

Also, the tiny turbo will heat up the intake charge excessively because it's working outside of it's efficient ranges. That adds excessive heat to the engine that wouldn't be there with a properly sized turbo.
The second part of this post is wrong to my understanding. Why on earth would a turbo that is used at 6psi be out of it's efficiency range. What you say would be true if he were running it at 15psi, but at 6?

The other thing is he isn't using this for some super tuned set up that is going to make mad power. There is no reason not to use a VF-10. Keep in mind that turbo is the stock unit on a 2.2l car, so using it on a 2.5l engine is not that big a deal. I have the compressor maps and have run the numbers and he is fine with that turbo. Furthermore, I think your opening remarks do not apply to his particular situation. If he was looking for a perfect set up for his 2.5 he would not use either the TD04 or the VF-10. But in stock form his EJ25 looking to push a little extra air through there will do just fine with these small turbos and not get the backpressure and detonation you are talking about. That too is for a high powered build.

I know Eli and have talked with him on occasion about his plans. This initial kit he is putting together is to get experience and get it set up. Down the road he will build or switch his block and get a bigger turbo and whatnot to meet his needs. The important thing is context. You have not posted false tech, just tech that doesn't apply to the parameters of this set up...
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