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Old 01-21-2002, 12:54 AM   #1
Imprezer
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Join Date: Jun 1999
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Location: Alameda, CA
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2011 Impreza WRX STi
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Default Tumble Generation Valve Info

I need some...

What does it do and when?

As much info as possible is needed.

All I know is that it is an emmision device. They are closed when the car is cold and open after the normal operating temp is reached or until the TPS goes pass certain point.

Do they stay open all the time?

Do they do anything for idle control?

-Alex
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Old 01-21-2002, 01:00 AM   #2
Conduit
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Location: Orlando, FL. USA
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2002 WRX
MBP, 1st WRX Ever in FL.

Default

I know there are a ton of engine codes relating to their operation.

Thinking about removing them when you go fully standalone, I take it? Would you use a different manifold, or are they between the manifold and the head? I haven't had my manifold off, so, I don't know.
take care,
rob
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Old 01-21-2002, 01:06 AM   #3
d00f
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I did a lot of reading when someone proposed pulling these out. Not only do they improve emissions but they also give you more low end torque. The valves give your intake charge a higher velocity and better mixing in the cylinders.

Removing them will give you more power at the top end since there is less restriction in the intake. So you made a decision, low end torque for high end gain?

-Michael
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Old 01-21-2002, 01:23 AM   #4
savka
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"...tumble generators" in each of the engine's four intake runners. The tumble generators are basically block-off plates placed just upstream of the fuel injectors, which create a vortex in intake air, promoting cleaner burn and leaner air-fuel mixture during cold-start and low-speed operation. The valves, which look and operate like throttle plates missing one side, open gradually beginning at 3000 rpm to allow intake air to flow freely..."

http://irvinesubaru.com/wrx/sccweb.html#bot



sav
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Old 01-21-2002, 01:32 AM   #5
AZScoobie
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netcom.com

Default Re: Tumble Generation Valve Info

Quote:
Originally posted by Imprezer
I need some...

What does it do and when?

As much info as possible is needed.

All I know is that it is an emmision device. They are closed when the car is cold and open after the normal operating temp is reached or until the TPS goes pass certain point.

Do they stay open all the time?

Do they do anything for idle control?

-Alex
If you email me I will bouce a PDF file to you with info about the TVs..

CT
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Old 01-21-2002, 02:13 AM   #6
Concillian
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I figure knife edging the leading edge can't be a bad thing. It shouldn't impede the intended operation, and should introduce less restriction when it matters (full open)

I thought someone was going to take them out and report back with butt dyno results.

Alex, if you search back for into, there was a prolonged thread on it (3+ pages) discussing removing/knife edging, but nobody had the wherewithall (or the downtime) to do it. Even so, there were some good discussions there.
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Old 01-21-2002, 03:12 AM   #7
alfriedesq
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With the PEMS we are usuing - it seems the stand lone ecu runs everything we neeed

Therefore I suggest - that out the TVG part of the manifold and send it to a speed shop with a flow bentch - eg www.marrenmotorsports.com www.injector.com etc.

They can effectively remove that restrictive c rap right away !!!
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Old 01-21-2002, 03:24 AM   #8
8Complex

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