TGVs, what is their purpose and are they a must to get rid of?

ndubz · 06-25-2010, 05:01 PM

What do they really do? I heard theyre for cold start emmissions, but can someone explain it please? and do they serve any other purpose.

Im about ready to do a 20g setup on my Sti and Im wondering if its really "necessary" to have the TGVs deleted as far as function and safety goes. I realize the butterfly valves are "in the way" and that its a bit restrictive. but I looked at the hours required for all of the parts and the TGVs took the most time of anything, kind of alot for something that isnt really necessary. so im thinking i'll just leave them in for now unless there some real reason to pay that much money to take them out.

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mapleleaf · 06-25-2010, 05:10 PM

You don't need to remove them if you use most 2.4 inch inlets.
As for their purpose, a quick search will give you the answer.

GrimmSpeed · 06-25-2010, 05:29 PM

Each TGV housing has 2 valves and 2 passage ways (one for each runner). During cold start ups the tgv's valves stay closed and force air into the passage way which "tumbles" the air, this makes for a more ideal air fuel mixture with a cold car. As long as your car is tuned properly running tgv deletes in cold climates is no problem. We're in Minnesota and run the deletes on all of our personal cars with no issues.

The TGV's are definitely the largest restriction in the oem intake system and i would definitely recommend them on just about any modded subaru, especially if you're upgrading to a turbo as large as a 20g. Yes the install does take a while but if you're already in there adding stuff like injectors or an inlet it wont take much extra time at all. Will your car run and be driveable without the deletes? Yes. Will the car run a lot better and not choke on the top end with the deletes? Yes.

Mike

GrimmSpeed · 06-25-2010, 06:27 PM

Check it out!

YouTube- GrimmSpeed TGV Porting

Will

urabus its 40 · 06-25-2010, 07:52 PM

FAQ section..... mmmgood

http://forums.nasioc.com/forums/show....php?t=1663677

06-25-2010, 05:01 PM	#1
ndubz Scooby Newbie Member#: 194713 Join Date: Nov 2008 Chapter/Region: MAIC	TGVs, what is their purpose and are they a must to get rid of? What do they really do? I heard theyre for cold start emmissions, but can someone explain it please? and do they serve any other purpose. Im about ready to do a 20g setup on my Sti and Im wondering if its really "necessary" to have the TGVs deleted as far as function and safety goes. I realize the butterfly valves are "in the way" and that its a bit restrictive. but I looked at the hours required for all of the parts and the TGVs took the most time of anything, kind of alot for something that isnt really necessary. so im thinking i'll just leave them in for now unless there some real reason to pay that much money to take them out. * Registered users of the site do not see these ads.

06-25-2010, 05:29 PM	#3
GrimmSpeed NASIOC Vendor Member#: 136396 Join Date: Jan 2007 Chapter/Region: MWSOC Location: Minneapolis, MN Vehicle: 2012 wrx white	Each TGV housing has 2 valves and 2 passage ways (one for each runner). During cold start ups the tgv's valves stay closed and force air into the passage way which "tumbles" the air, this makes for a more ideal air fuel mixture with a cold car. As long as your car is tuned properly running tgv deletes in cold climates is no problem. We're in Minnesota and run the deletes on all of our personal cars with no issues. The TGV's are definitely the largest restriction in the oem intake system and i would definitely recommend them on just about any modded subaru, especially if you're upgrading to a turbo as large as a 20g. Yes the install does take a while but if you're already in there adding stuff like injectors or an inlet it wont take much extra time at all. Will your car run and be driveable without the deletes? Yes. Will the car run a lot better and not choke on the top end with the deletes? Yes. Mike Last edited by GrimmSpeed; 06-25-2010 at 05:42 PM.

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06-25-2010, 05:10 PM	#2
mapleleaf Scooby Specialist Member#: 103399 Join Date: Dec 2005 Chapter/Region: E. Canada Location: Halifax, Nova Scotia Vehicle: 2009 Stripped STI Dirty White	You don't need to remove them if you use most 2.4 inch inlets. As for their purpose, a quick search will give you the answer.

06-25-2010, 07:52 PM	#5
urabus its 40 Scooby Newbie Member#: 77035 Join Date: Dec 2004 Location: OK Vehicle: 2004 STi - Dom 3xtr w/ wooden wheels	FAQ section..... mmmgood http://forums.nasioc.com/forums/show....php?t=1663677