You are browsing the 'TVIS removal' technical discussion topic
Tvis was fitted on the rev 1 and 2 cars. You only have to disconnect and plug the vacuum pipes to disable it, but the only result will be a lack of torque below 4600rpm. There is no point in removing it unless you have a tubby and want to run loads of boost.
If butterflies were removed and so permanently open as it is over 5000rpm would the performance down the rev range improve? If yes would the ECU figure it all out ok, no detrimental side effects?
All this relation to a UK rev2 3sge SW20
didnt think the sw20 had tvis :/ only the aw11. probably wrong tho as iv never owned a sw20. in reply to that tho, there was a graph done on a a dyno somewhere with tvis on and taken out. there was more torque up to 4000 rpm with it working and no detrimental effect from air obstruction. but with the tvis taken out it had less torque low down and the same power up top. id reccommend leaving it in, it does work :)
it seems the tvis should be taken out when using turbo applications or enough power when the inlet is becoming restrictive. i doubt it will with an NA. hth