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sic86
31st July 2005, 09:25 PM
Just want to know if there is any difference between the JDM 4AGE nad ADM 4AGE Heads? Also, are the 4AGZE heads difference at all? Do all of the have T-VIS? Can someone explain exactually what T-VIS is please?

Cheers

DRFTAE86
31st July 2005, 11:40 PM
This might help....

http://www.billzilla.org/4agstock.htm

A good website to read on a boring day. http://www.ae86drivingclub.com.au/forums/emoticons/smile.gif

dori_86
31st July 2005, 11:43 PM
hmm i dont think u posted a link or my cop extremely slow http://www.ae86drivingclub.com.au/forums/emoticons/dry.gif

DRFTAE86
1st August 2005, 11:50 AM
Your comps slow....

http://www.ae86drivingclub.com.au/forums/emoticons/laugh.gif ... just kidding, my bad.... all fixed.

Medicine_Man
1st August 2005, 03:31 PM
Originally posted by Alan@Jul 31 2005, 08:25 PM
Can someone explain exactually what T-VIS is please?

Cheers
The TVIS plate sits in-between the intake manifold and the head, the theory behind it is that only four intake runners are open at low revs to keep the intake velocity up. Somwhere around 4400RPM - 4500 RPM the ecu triggers a vacuum switching valve to open up which in turn causes the engine vacuum to open the other 4 intake runners in the TVIS plate. This way the engine is getting more air as its under a greater load, This helps the engine keep its low down torque.

The 100KW (smallport) motors don't have the TVIS plate, as the "small ports" are what helps keep its intake velocity up.

my write up on rollaclub.com faq (http://www.rollaclub.com/faq/index.php?title=Tech:Engine/A_Series/TVIS)