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Old 04-18-2013, 08:53 PM   #26
drewvdw
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Join Date: Aug 2010
Chapter/Region: MWSOC
Location: Laramie, WY
Vehicle:
2010 LR WRX
MPS powered.

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My break in period is done, but I haven't had a chance to get my car tuned. I'll have to call and set up an appointment.

I'm still wondering how it worked perfectly fine through the majority of my break in and then it just quits...
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Old 04-19-2013, 07:30 AM   #27
pmugabi
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Quote:
Originally Posted by vica153 View Post
While a 3 port limits max boost to roughly 2 times spring pressure, a 4 port can run 4 or more times spring pressure.
I call misinformation on this.

I have run 21psi with a 2 port boost solenoid and 7psi spring. The limiting factor was the turbo (TD04HL) and not the wastegate actuator.

I think people get hung up on thinking more ports = better.

I sincerely think that if you need to apply pressure to keep the wastegate closed you have very serious back pressure problems or are running insanely high boost.

From my limited experience, if you take the time to modify the RPM axis for your WGDC map to give you more resolution where it matters (in my opinion have most of the RPM scale at just before and after max boost) , even a 2 port will provide very similar characteristics to an MBC (which as we know is the best for spool-up). Caveat: this is if you live in a place with no major elevation and climate changes.
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Old 04-19-2013, 12:46 PM   #28
vica153
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Location: Seattle, WA
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1994 GF6

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Quote:
Originally Posted by pmugabi View Post
I call misinformation on this.

I have run 21psi with a 2 port boost solenoid and 7psi spring. The limiting factor was the turbo (TD04HL) and not the wastegate actuator.
Which is why I said roughly. Depending on the turbo and wastegate size/type you could force a bit more, but at 21 psi boost your exhaust pressure is going to be well over 7 psi and probably forcing the wastegate open. You can make it work, but you're no longer properly controlling the turbo.
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Old 04-21-2013, 02:24 PM   #29
WoodsWagon
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lots of junkers

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Quote:
Originally Posted by drewvdw View Post
I'm still wondering how it worked perfectly fine through the majority of my break in and then it just quits...
Where was your boost pressure reading coming from? Do you have a physical boost gauge plumbed in with a hose? Where was it connected to on the intake?

Or were you using a digital gauge that ran off the reading from the MAP sensor?
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Old 04-21-2013, 02:41 PM   #30
drewvdw
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2010 LR WRX
MPS powered.

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I've got a digital boost gauge teed into the BPV hose
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Old 04-21-2013, 03:07 PM   #31
FuJi K
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MY99 GF4 JDM 6spd
NF Performance

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Quote:
Originally Posted by drewvdw

I can already tell you what I'll find. Fuel cut.

I'll probably be swapping out springs since I've been meaning to anyways.
Whatever spring you run, that is what it'll open at when hooked directly to the compressor side. If you're running less that the spring, you have a major leak on the intake side, which the ewg won't open because it hadn't hit the springs pressure. If you're hitting fuel cut, something is causing the ewg not to open thus over boosting.

If you can't figure out the situation from this, take the car to where you're getting tuned and they'll be happy to take your money.
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