Mk1 Gs 300 ?

[ukgs300]

just a quick one i have been told my engine in my 1993 gs is a vvti is this true ? :zee:

[ColinBarber]

No. The series II from Jan 1998 have vvt-i

[mudzs]

I think a lot of people think it has vvti due to the surge in power at about 4000rpm ,not to sure what causes this ,any idea colin :)

[ukgs300]

i agree mudze mine does the same alot like my honda prelude vtec but not in such a feirce way any help ?

[ColinBarber]

vvt-i is not really there for performance. It increases low end torque but is mainly for economy and emmisions. That and the 5-speed auto box are the main reasons why the series II is more economical than the series I.

vvt-i does not kick in, you don't feel it.

Nearly all Toyota engines give a kick around 4,000 rpm. Below that speed the engine is designed for low end torque, economy and quietness. However to get the most performance out of the engine and the 4 valves per cylinder design a couple of things happen. Firstly the path the air takes into the engine is shortened. This decreases low end torque but allows better engine breathing and is achieved by the ACIS valve. Also the ignition timing is advanced to give an increase in engine performance.

[norkep]

vvt-i is not really there for performance. It increases low end torque but is mainly for economy and emmisions. That and the 5-speed auto box are the main reasons why the series II is more economical than the series I.

vvt-i does not kick in, you don't feel it.

Nearly all Toyota engines give a kick around 4,000 rpm. Below that speed the engine is designed for low end torque, economy and quietness. However to get the most performance out of the engine and the 4 valves per cylinder design a couple of things happen. Firstly the path the air takes into the engine is shortened. This decreases low end torque but allows better engine breathing and is achieved by the ACIS valve. Also the ignition timing is advanced to give an increase in engine performance.

Dam Colin, Is there anything you don't know these beauties

[ukgs300]

cheers colin sounds like you know your stuff so ill trust you on this i didnt think it wqas a vvti just some thing a mate told me cheers .