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  Soarer Central * Mechanical - N/A 6 (JZZ31) * Plenum 2JZGE intake Plenum, whats the purpose of this vacuum butterfly valve? Previous Previous    Next Next  

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Mike Beck
Goo Roo
New Zealand
Soarer JZZ31 I6

Posts: 1916
Reg: 11-2005

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 Monday, March 17, 2008 - 04:39 pm, by:  Mike Beck (Gold_40gt) Quote hilighted text Edit Post Delete Post Print Post   View Post/Check IP (Moderator/Admin Only) Move Post (Moderator/Admin Only)
Ive taken the intake plenum off my motor (Between the 6 Runners to the head and the Y join from the TB) to get some measurements of a few things.

While having it off I noticed that in the intake chamber, between 3 of the cylinder runners and the other 3, theres a vacuum butterfly valve....

Wondering what the purpose of this is? What would happen if it was not there or working?

My guess its possibly to do with fuel economy at lower speeds and to change the torque depending on if the throttles high or low?

Cheers Guys, Ill get pictures if required!
Simon Triantafillou
Goo Roo
NSW
Soarer Turbo

Posts: 1265
Reg: 07-2005

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 Monday, March 17, 2008 - 05:00 pm, by:  Simon Triantafillou (Soarer) Quote hilighted text Edit Post Delete Post Print Post   View Post/Check IP (Moderator/Admin Only) Move Post (Moderator/Admin Only)
TVIS maybe?

I have a spare 2JZ-GTE intake manifold if you're interested :-)
Mike Beck
Goo Roo
New Zealand
Soarer JZZ31 I6

Posts: 1917
Reg: 11-2005

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 Monday, March 17, 2008 - 05:09 pm, by:  Mike Beck (Gold_40gt) Quote hilighted text Edit Post Delete Post Print Post   View Post/Check IP (Moderator/Admin Only) Move Post (Moderator/Admin Only)
Yeah I was thinking it could be a basic form of T-VIS.

Haha nah no need for one of those right now.
Matthew Sharpe
Goo Roo
North Island
JZZ31

Posts: 3441
Reg: 10-2005

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 Tuesday, March 18, 2008 - 07:07 am, by:  Matthew Sharpe (Madmatt) Quote hilighted text Edit Post Delete Post Print Post   View Post/Check IP (Moderator/Admin Only) Move Post (Moderator/Admin Only)
I thought it was what passes for "traction control" on the JZZ31 when I spotted it. Just a guess though.
Mark Bryant
Tinkerer
tasmania
2jz na/t and tt

Posts: 64
Reg: 08-2010

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 Thursday, October 21, 2010 - 02:41 pm, by:  Mark Bryant (2jz_nat) Quote hilighted text Edit Post Delete Post Print Post   View Post/Check IP (Moderator/Admin Only) Move Post (Moderator/Admin Only)
I'v read on a supra forum that when you hit about 4500rpm in opens up and thats what gives you that power band from there up to 7000rpm or so.
If you have ever driven a 2jzge this is very noticeable.

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