ttlpckge

Greetings all! I purchased a new 2008 IS250 AWD on New Year's Eve and have been lurking on this forum for the last 2 years before making my purchase. I'm coming from a 2001 Celica GT so I was hoping someone here could enlighten me.

My Celica GT had the VVTi engine; the Celica GTS came equipped with the VVTi-L engine; and the ISx50's engines have Dual VVTi.

Can someone explain:

1) what the differences in each engine are?
2) what the advantages are, if any, in VVTi-L vs. VVTi (single, dual or otherwise); and
3) why isn't there are Dual VVTi-L like there is in a Celica GT-S engine (VVTi-L)

Sorry if this is a noob post, but I really want to know. Thanks.

triple_c

1) VVTi varies intake valve timing only. VVTi-L varies intake valve timing and valve lift, which is the distance the camshafts moves the valves. Dual VVTi varies both intake and exhaust valve timing.
2) Not sure, but I think VVTi-L can provide more power without changing engine displacement. So just by adding the VVTi-L capabilities, you increase horsepower in an otherwise similar engine.
3) Ask Toyota.

tfz_hebe89

iTrader: (1)

haha..good question.. i'm not a mechanic, i dont know this stuff.

i also saw dual vvt-ie in LS, which stands for dual variable valve timing w/intelligence electronic. wth is that?

triple_c

VVTi-E is basically the same as VVTi, except the intake camshaft is controlled by an electric motor. VVTi controls the camshaft using a hydraulic actuator. The electric motor is supposed to be more responsive and precise than the hydraulic actuator.