sonbum1

iTrader: (3)

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.

xirforever

I think the 3rd gen had VVT-i, that helps a bit.

GRAND_LS 4

iTrader: (2)

The LS has 290Hp, not 300. Due to VVT-i, and the 5-speed Auto primarily, and other small improvements here and there.

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

GRAND_LS 4

iTrader: (2)

Thats true. Not sure what the orginal poster meant by Gen 3, 2001 the third+, and Lexus calls the 98+ third gens.

PureDrifter

iTrader: (10)

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

sonbum1

iTrader: (3)

Thank you all who replied. I may have some questions on V V T I in a few days.

gowest

I think that VVTi boost torque and hp up alot at lower engine RPM. Anyone have pic of stock dyno chart comparision between 1st version and 3rd version UZ.

sonbum1

iTrader: (3)

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?

PureDrifter

iTrader: (10)

http://en.wikipedia.org/wiki/Variable_valve_timing