I may have some questions on V V T I in a few days. 
Power difference In gen1 vs. gen3
Power difference In gen1 vs. gen3
How did lexus get such a big power difference from the gen 1 LS to the gen3 LS? I think the hp's are 250 & 300 respectivly. I believe they are on the same block (1uz) there both 4.0 liters, and the exhaust doesn't seem any freer flowing. 
Originally Posted by persian451
its qutie a big difference as far as accelration goes.. i'm not sure, but the 3rd gen might be lighter.. i know the 2nd gen is compared to the 1st
by third gen im asssuming hes reffering to the third bodystyle LS400 and not the UCF30/31 LS430s. so this is the 98-00 UCF21(gen 2.5) cars as compared to the early 89-94 UCF10/11(gen 1/1.5) cars.
now, the gen 1 cars had the same 4.0L 1uz block as the rest of the "400"s. but it made
250 hp @ 5600 rpm and260 ft-lbs. @ 4400 rpm. it also had a 4spd ect-i automatic trans.,
the Gen 2.5 cars had the same block BUT had Toyota's version of Variable Valve Timing - VVT-i.
this gave the gen 2.5 cars about 290 hp @ 6000 rpm and 300 ft-lbs of torque @ 4000 rpm. these cars had a new 5spd Automatic trans with ECT-i.
the gen 1 cars had a curb weight of 3759 lbs.
the gen 2.5 cars had a curb weight of ~3650 lbs give or take some.
hope this helps
-Annant
now, the gen 1 cars had the same 4.0L 1uz block as the rest of the "400"s. but it made
250 hp @ 5600 rpm and260 ft-lbs. @ 4400 rpm. it also had a 4spd ect-i automatic trans.,
the Gen 2.5 cars had the same block BUT had Toyota's version of Variable Valve Timing - VVT-i.
this gave the gen 2.5 cars about 290 hp @ 6000 rpm and 300 ft-lbs of torque @ 4000 rpm. these cars had a new 5spd Automatic trans with ECT-i.
the gen 1 cars had a curb weight of 3759 lbs.
the gen 2.5 cars had a curb weight of ~3650 lbs give or take some.
hope this helps
-Annant
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Ok.... V V T I is this somthing that is electronicly controled as in ECU or some other computer system, or is it mechanical, as say the cams/valves/springs? Basically is this a tuning thing that could be done by upgrading some hardware, or is this an enginering thing that requires computer/electronic sytem intergration?
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