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Old 05-28-2005, 01:53 PM   #1
peterex
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Question GM solenoid / Perrin EBCS on the stock WRX turbo

Does anyone have firsthand data showing earlier spoolup when running the GM solenoid or Perrin EBCS on a TD04 turbo? Is it worth the effort/expense?

I scoured all the relevant threads, and it seems that most people who run these upgraded boost solenoids have larger turbos. If there is any benefit whatsoever on the stock turbo, I wouldn't mind spooling 100-200rpms faster for the relatively cheap price of the GM solenoid. Of course, tuning would be required to prevent spikes and stuff.
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Old 05-28-2005, 04:09 PM   #2
phantomsr
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Running in interrupt mode you may see a slight increase in spool as the wastegate see's no pressure until the solenoid opens. With the stock setup the FBC is used to reduce the pressure the wastegate sees. This can let the wastegate leak a little and slow spool time. The benefit is more noticeable on larger turbos but not useless on the TD04. And once it's on, you don't have to change it out when you upgrade either.
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Old 05-29-2005, 12:18 AM   #3
peterex
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Thanks for your input. Can you estimate, in terms of RPMs, the amount of spool increase?
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Old 05-29-2005, 12:23 AM   #4
MrH00nel2
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id guess around a 150-250 ish rpm less???
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Old 05-29-2005, 06:01 AM   #5
Barge
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With the streettuner I've been able to get it to get up in the boost pretty quick. The biggest difference is in 1st and 2nd gear. In 1st gear I can usually hit 16 psi instead of the stock 10-12.
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Old 05-29-2005, 09:27 AM   #6
peterex
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Cool. Sounds like it's worth it.
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Old 05-29-2005, 11:47 AM   #7
phantomsr
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Just don't try interrupt mode without tuning as you WILL overboost. This mode is opposite of the stock setup and opening now allows the pressure to reach the wastegate instead of bleeding it off.
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Old 05-29-2005, 01:05 PM   #8
TheMadScientist
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Quote:
Originally Posted by phantomsr
Just don't try interrupt mode without tuning as you WILL overboost. This mode is opposite of the stock setup and opening now allows the pressure to reach the wastegate instead of bleeding it off.

Ohh really? Thats nice so if the solenoid fails you get all the boost the turbo will make?
If you hook up the GM the way it is shown in the thread you get wastegate boost if the solenoid fails.
More duty cycle to the solenoid = less duty cycle to the waste gate =higher boost = the way stock works
Don't know how the EBCS is being hooked up but if your description is correct then that is very dangerous.

TMS
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Old 05-31-2005, 06:49 AM   #9
ride5000
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fwiw, in both scenarios, the ecu applies 12vdc (or, more accurately, provides a "pull down" in the ground conductor) to INCREASE boost.

in other words, in both scenarios, if the electrical circuit becomes open or shorted, you get wastegate boost.

i know mark knows this, but some folks don't.
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