Knowledge Base - Info:- What is TVIS?

TVIS means Toyota Variable Induction System.

Toyota have been using TVIS since the mid 80's. Not to be confused with VVTi or VTEC variable cam timing! At a predetermined RPM (in the case of the MK2 4800rpm) a vacuum operated valve opens a series of butterfly's that allow the engine breath easier, thus increasing power output.

TVIS actually restricts airflow at revs below 4800rpm to increase intake charge velocity. This allows the engine to produce more torque for town driving.

TVIS doesn't actually make the engine more powerful, it simply helps the engine give more grunt at low revs. If TVIS is disconnected, the engine is less powerful all the way to 4800 rpm.

Peter Jones.

Copyright © by MR2 Owners Club All Right Reserved.

Details

Created : 2011-10-05 16:33:51, Last Modified : 2011-10-05 16:33:51

User Comments

Technical Disclaimer 

The MR2 Owners Club and its respective owners, editors and contributors make no representations about the suitability of the information contained in the documents, materials and related graphics published on mr2oc.co.uk  

By entering this site, you hold this site and it's affiliates not legally responsible for any damages due to advice given here. This site and it's affiliates takes no responsibility for consequences of any actions that arise from advice given. Any opinion is given with information provided by you and can not be taken as absolute.

All repairs should be undertaken by a competent and qualified technician. By using this site, you understand and agree that all advice given and followed are at your own risk and do not hold this site or it's affiliates responsible for any damages.