Och

iTrader: (3)

What do you guys think - will it be the 3.5 from ES with 272 ponies or the sweet 3.5 from the IS with 305 ponies?

Also, what was the point for Lexus to even make the current 3.0 V6 in the GS300 - it is not found in any other model, and it's lifespan was relatively short. It doesn't seem like it will see the daylight in any fugure models. IMO they should have just kept the old I6.

spwolf

obviously it is 306hp with dual injection.... 3.0 is used in plenty of other models in Japan (Crown). 3.0 was put in because 3.5 was not available at that time...

Keep old I6? lol.

bitkahuna

iTrader: (20)

Are the engines in the new ES and IS the same with different tuning/intake/exhausts?

Anyway, I think Lexus offered the 3.0 V6 in the 3rd gen GS300 because they didn't have the 4.6 ready for the V8 model and didn't want to crush sales of the GS430 entirely with a GS350. Why bother buying a 300HP GS430 if a 300HP (or thereabouts) GS350 is available for $5-8K less?

But the GS350 can come out with the GS450h and GS460 and it will be more spread out.

As for using the old I6, I doubt they wanted to do that development making it FIT, working with new transmission, getting it certified, weight considerations, etc.

Och

iTrader: (3)

Yeah, I too think its going to be the 3.5 from the IS, since the GS has never shared the engine with ES/RX, even though the displacement was the same and power output was close. However I think the engine will be detuned to maybe 290 or so HP and made smoother and more quiet.

Great point!

rominl

iTrader: (4)

i thought the two v6 are of different series, but i could be wrong

however, obviously, it has to be the 306hp engine that's in the is350. the one in the es350, if anything, is more fuel economy friendly, geared more towards smoothness than performance

Koma

iTrader: (3)

You are correct sir. They are two different 3.5 V6s. The ES getting the IS's V6 would be just stupid amounts of oversteer.

Och

iTrader: (3)

You mean torque steer?

MSMLexIS

The gs350 in japan uses the IS 3.5 v6 i just cant find 0-60 performance for the car.

XeroK00L

Yep, again there's no mystery surrounding the GS350 besides perhaps a 0-60 time. We will get what Japan gets in the GS350 (sans some cool electronic gadgets ), the 2GR-FSE.

4TehNguyen

iTrader: (1)

how much more does the GS weigh over an IS, im gonna estimate a 0-60 of like 5.9ish since the IS is around 5.4ish

Och

iTrader: (3)

Not a chance, the 430 is 5.9ish with way more torque, but then it weights more

Och

iTrader: (3)

By the way, if the 460 gets into 4 second territory, I'm gonna crap my pants.

Gojirra99

According to specs. at lexus.jp,

GS350 weighs 40 kg (88 lb.) more than the IS350.
GS350 AWD weighs 90 kg.(198 lb.) more than the GS350 RWD

IS350 : hp = 318 ps, torque = 380 Nm.
GS350 : hp = 315 ps, torque = 377 Nm.

XeroK00L

Actually, the 430 has an official 0-60mph time of 5.7s.

Now regarding the 0-60mph time for the GS350, here's my calculation:

FACTS
1. The IS250's curb weight = 3,435lbs.
2. The IS350's curb weight = 3,527lbs.
3. The GS300's curb weight = 3,536 lbs.
4. The IS350 has an official 0-60mph time of 5.3s.

ASSUMPTIONS
1. The weight difference between the IS350 and the IS250 is solely due to the difference in engine displacements (i.e. port injectors and VDIM-related mechanism weigh nothing).
2. The GS350 will have the same horsepower output as the IS350 (even though according to lexus.jp the GS350 produces 3ps less than the IS350).
3. Torque remains FLAT throughout the accelerations (obviously this isn't true, but the GR engines have a torque curve broad and flat enough to make this assumption OK for a rough estimate). This also means no gear change is taken into account.

CALCULATIONS
1. Each liter of displacement in the GR-series engine weighs (IS350's weight - IS250's weight) / (IS350's displacement - IS250's displacement) = (3,527lbs. - 3,435lbs.) / (3.5L - 2.5L) = 92lbs./L
2. From 1., GS350's weight = GS300's weight + 0.5L's worth of weight of the GR-series engines = 3,536lbs. + 0.5L x 92lbs./L = 3,582lbs.
3. Since weight is inversely proportional to acceleration (F = ma), and acceleration is inversely proportional to acceleration time given the same target velocity (v = at), weight is proportional to acceleration time; therefore, the 0-60mph accerlation time for the GS350 = IS350's accleration time x (GS350's weight / IS350's weight) = 5.3s x (3,582lbs. / 3,527lbs.) =~ 5.38s =~ 5.4s

This actually makes sense since the GS350 will be barely heavier than the IS350 (heck the GS300 is only 9lbs. heavier than the IS350) and the GS430 doesn't have a torque curve nearly as flat as the 3.5L's, so in terms of 0-60 time the GS350 can win GS430 easily with more horsepower.

Remember you heard it here first.

XeroK00L

Haha, you're right. I forgot the weight of the GS350 vs. the IS350 can already be looked up at lexus.jp.

So based on this new, more precise fact that the GS350 weighs 88lbs. more than the IS350, the American curb weight of the GS350 should be 3,527lbs. + 88lbs. = 3,615lbs. instead. And therefore the acceleration time of the GS350 should become 5.3s x (3,615lbs. / 3,527lbs.) =~ 5.43s, still around 5.4s after round-off.