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FWDCelica Forums Junkie Location: sydney,nsw.oz. Registered: July 2002	Re: ST162 TVIS Sun, 14 March 2004 02:44 T-VIS The real explanation Courtesy of "http://www.dorikaze.ca/" T-VIS stands for Toyota Variable Induction System. It came on two of Toyota's Sports-type Twin Cam engines, the 4A-GE (Corolla GT-S, MR2) and the 3S-GE (Celica). Here's how it works as described by Toyota*... >> This system's intake passages are divided in two and a valve is placed in one side. Then, depending on engine rpm speed, the valve is opened or closed, which changes intake efficiency and improves performance across the rpm range. At low-to-mid rpm, the valve is closed. This effectively narrows the intake passage, which increases the speed of the air flow. Greater air flow speed results in greater volumetric efficiency, which boosts torque output at low-to-mid revs considerably. At high rpm, the valve is open, which reduces resistance within the intake passage and allows full development of the high-rev power potential inherent in the 4-valve configuration. << *info gathered from "Toyota Engine Technology" Toyota part# PR-E-8905 printed in Japan 1989 T-VIS was used only on the first model of the 4A-GE (bluetop), being in all Corolla GT-S' (AE86's) and MR2's (from 85-87), and was then removed when the newer Corolla GT-S (AE92) equipped with a slightly more powerful version of the 4A-GE came into production. For the 4A-GE's which are T-VIS equipped, the system will open the intake valve at approx. 4400 rpm. A noticeable <glitch> is usually heard when the T-VIS kicks in. It's more noticeable when a free-flowing aftermarket intake is installed. [Report message to a moderator]

	Subject	Poster	Date
	ST162 TVIS	dar_sbb	Wed, 10 March 2004 00:27
	Re: ST162 TVIS	Danners	Wed, 10 March 2004 00:30
	Re: ST162 TVIS	RWDboy	Wed, 10 March 2004 00:42
	Re: ST162 TVIS	dar_sbb	Wed, 10 March 2004 00:57
	Re: ST162 TVIS	FWDCelica	Wed, 10 March 2004 01:18
	Re: ST162 TVIS	ST162GT-R	Wed, 10 March 2004 10:04
	Re: ST162 TVIS	FWDCelica	Sun, 14 March 2004 02:44
	Re: ST162 TVIS	RWDboy	Wed, 10 March 2004 01:27
	Re: ST162 TVIS	charliechalk	Mon, 15 March 2004 02:42
	Re: ST162 TVIS	RWDboy	Mon, 15 March 2004 02:48
	Re: ST162 TVIS	charliechalk	Mon, 15 March 2004 02:51
	Re: ST162 TVIS	RWDboy	Mon, 15 March 2004 03:01
	Re: ST162 TVIS	dar_sbb	Mon, 15 March 2004 06:57
	Re: ST162 TVIS	charliechalk	Mon, 15 March 2004 08:16
	Re: ST162 TVIS	toof	Tue, 16 March 2004 00:20
	Re: ST162 TVIS	dar_sbb	Tue, 16 March 2004 00:33
	Re: ST162 TVIS	RobST162	Tue, 16 March 2004 00:36
	Re: ST162 TVIS	alliance_22	Mon, 22 November 2004 04:16
	Re: ST162 TVIS	RobST162	Mon, 22 November 2004 05:11
	Re: ST162 TVIS	b1gb3n	Tue, 23 November 2004 01:02

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