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Old 01-20-2005, 09:15 PM   #1
scoobaru_wagon
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Default how much boost for stock wrx turbo in wrx

so how much till it runs out of effiiency anybody have a compressor map of it. what is it a mitsu td 04 if so which one they have like 3 of em
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Old 01-20-2005, 10:20 PM   #2
hotrod
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The stock turbo is generally most effecient up to about 16 - 16.5 psi. Above that you can only use the higher boost in the midrange rpms as the air flow is still within the capacity of the turbo. No matter what you set the turbo to, at 7000 rpm you will see boost drop down near 14 psi or so because the turbo simply cannot provide enough air to maintain a higher boost pressure.

At higher rpms and boost level settings above 16 psi you need to be sure you have adequate fuel octane to prevent detonation.

If you had asked this question a few days ago I would have said yes we have a compressor map, but the map that everyone was using was for the 13G compressor which we now know is not the correct compressor for the stock WRX turbo. It has a 13T compressor which flows slightly more than the 13G, but unfortunately, no one has found a 13T compressor map yet.

Based on our experience over the last few years, the 13G compressor map is probably good enough for most applications but the 13T probably flows slightly more at max flow, possibly 385 CFM vs the 360 CFM rating of the 13G.

Larry
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Old 01-26-2005, 07:34 PM   #3
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[quote=hotrod] thank you sir i appreciate it so if i run 15.5 im straight. thanks alot i didnt want to be turning my turbo into a hair dryer at 15.5psi thanks
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Old 01-27-2005, 05:06 AM   #4
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I run 21 psi boost on my edm wrx. It's alittle high but no problems yet.. Have been boosting this for the last 30k miles @ norwegian 98 octane fuel.

Only engine mods are catless exhaust, kn filter and mbc But just because I have no problemes doen not mean I recomend this high boost..
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Old 01-27-2005, 07:31 AM   #5
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i too run higher boost on the oem turbo. 19psi in the midrange. it tapers itself to ~15psi at redline. mods are on www page. logs show more maf voltage with higher boost in midrange.

hth
ken
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Old 01-27-2005, 09:02 AM   #6
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I'm curious as to how people are getting 15 psi at 7000 rpm on a stock turbo. With an electronic boost controller trying to maintain 16.5 psi, the best I can do is usually about 11 psi by 7000 rpm. Even by 5000 rpm, the boost is already starting to drop off. Please note, boost is controlled solely by an electronic controller. The ECU has no control over the boost levels any more.


Third gear pull at WOT:
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Old 01-27-2005, 10:36 AM   #7
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more info here http://forums.nasioc.com/forums/showthread.php?t=657897

bayley: mod list?

ken
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Old 01-27-2005, 10:54 AM   #8
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Efficiently, the stock TD04 boost I would say is 16psi. Anymore than that and youshould consider getting a bigger turbo.
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Old 01-28-2005, 01:05 AM   #9
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what is stock boost 14.5
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Old 01-28-2005, 01:05 AM   #10
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or 1 bar i know they are the same thing
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Old 01-28-2005, 01:27 AM   #11
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stock boost is 13.5 PSI
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Old 01-28-2005, 02:41 AM   #12
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where is the stock bc on the wrx
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Old 01-28-2005, 05:10 AM   #13
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Quote:
Originally Posted by turbocolin
where is the stock bc on the wrx

Behind the center console... The ECU.
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Old 01-28-2005, 05:51 AM   #14
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You can get the stock turbo to maintain boost at higher RPMs better by having a "Clip" performed on the hot side, but you'll loose some responsiveness and bottom end.

EDIT: Pardon me, Clipping the turbo reduces back pressure in the exhaust which in turns alows for the turbo to work more efficiently at higher boost/RPMs that a non-clipped wheel. And a less back pressure = more power . But as a side effect you may see higher boost levels than if not clipped.

Last edited by NWWagon; 01-28-2005 at 06:07 AM.
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