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feral4mr2 Forums Junkie Location: Bundaberg, Qld. Registered: May 2002	Re: 4age bigport TVIS Mon, 06 October 2003 12:32 taken from the Club4ag tech pages.. TVIS - Keep it or Remove it? There have been many, arguments on the issue of TVIS on early model 16 valve 4A-GE. The TVIS creates higher velocity intake charge at the engine's lower operating range by closing off one intake runner of the pair on each cylinder. Now, this is a highly effective method of making usable torque curves while retaining higher volume flow at high operating range. In most near normal applications, generally meaning light bolt-on tuning, the TVIS continues to function very well. Thus keeping it is a very good idea. However, heavier modifications including ECU, Carburetion, highly aggressive valve train/cam and internal work all present effects which create difficulty in controlling these items. For example, the triggers for the TVIS will be eliminated for carbureted applications, and it's variable induction, even if it was operational presents more complex challenge to jetting your carburetors. Heavily modified engine which greatly alters maximum rev range and shifts the power band in either direction will present similar challenges to an ECU programmer as well. In those cases it is easier to remove the TVIS and use the capabilities of the ECU tuning or carburetor jets to match your desired torque range. In short, for most basic performance upgrades, the TVIS should be kept and maintained to give nicer overall torque curve which does NOT inhibit power in any significant way. all the mr2 folk in the states have had worse perfomance by removing or disconnecting their t-vis when still useing a 4age bigport. [Report message to a moderator]

	Subject	Poster	Date
	4age bigport TVIS	ae95	Sun, 05 October 2003 11:45
	Re: 4age bigport TVIS	FKN16V	Sun, 05 October 2003 12:48
	Re: 4age bigport TVIS	BigWorm	Sun, 05 October 2003 13:01
	Re: 4age bigport TVIS	SLY16V	Sun, 05 October 2003 15:24
	Re: 4age bigport TVIS	ae95	Sun, 05 October 2003 15:32
	Re: 4age bigport TVIS	nos4ag	Mon, 06 October 2003 05:08
	Re: 4age bigport TVIS	SLY16V	Mon, 06 October 2003 09:34
	Re: 4age bigport TVIS	feral4mr2	Mon, 06 October 2003 12:32
	Re: 4age bigport TVIS	BigWorm	Mon, 06 October 2003 15:44
	Re: 4age bigport TVIS	THE WITZL	Tue, 07 October 2003 00:01
	Re: 4age bigport TVIS	ae95	Tue, 07 October 2003 05:55
	Re: 4age bigport TVIS	TurboRA28	Tue, 07 October 2003 06:57
	Re: 4age bigport TVIS	TurboRA28	Tue, 07 October 2003 06:58
	Re: 4age bigport TVIS	ae95	Tue, 07 October 2003 07:20
	Re: 4age bigport TVIS	causinmayhem	Tue, 07 October 2003 12:36
	Re: 4age bigport TVIS	nos4ag	Tue, 07 October 2003 13:13
	Re: 4age bigport TVIS	BigWorm	Tue, 07 October 2003 14:28
	Re: 4age bigport TVIS	nos4ag	Sat, 11 October 2003 07:26
	Re: 4age bigport TVIS	thechuckster	Sat, 11 October 2003 08:50
	Re: 4age bigport TVIS	BigWorm	Sat, 11 October 2003 10:43
	Re: 4age bigport TVIS	thechuckster	Sat, 11 October 2003 13:34
	Re: 4age bigport TVIS	BigWorm	Sun, 12 October 2003 07:48

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