Och

iTrader: (3)

I'd say 5.4 is a bit too optimistic, the GS will not have such agressive throttle responce and tranny as the IS, honestly I doubt it will even make it into 5's. How fast are M35 and RL running anyway?

Skulinex

I believe there was a post somewhere which stated that the IS250 will become IS300 <with that 3.0 v6 > after everyone gets their new engines

XeroK00L

Hmm the throttle response doesn't matter since all test drivers obtain their optimal acceleration numbers by launching cars while revved within the power band, and it's WOT from then on. Now the tranny does matter, but you know what, the GS300 has identical gear ratios to the IS250's 3.538 / 2.060 / 1.404 / 1.000 / 0.713 / 0.582, so it won't be surprising that the GS350 shares exactly the same gear ratios with the IS350's 3.520 / 2.042 / 1.400 / 1.000 / 0.716 / 0.586.

Given the above, I still think I have reasons to be optimistic.

Gojirra99

If the GS350 can do 5.5 or even 5.6 sec. 0-60, then the GS460 better be able to achieve at least 4.9 sec.

CK6Speed

iTrader: (1)

The best estimate of the GS350 0-60 performance can be based off the latests performace data from the 268HP Avalon that weigh's 3560lbs for the XLS and 3600lbs of the Limited. I don't know which model was tested in that review posted elsewhere, but the Avalon does a 0-60 in 6.2 seeconds with FWD. Surely a RWD GS350 close weight about the same making 38 more HP can shave off at least 0.3 seconds right?

XeroK00L

Hmm and why would Avalon, with a different drivetrain layout, different number of gears, different gear ratios (4.235 / 2.360 / 1.517 / 1.047 / 0.756) and a quite different torque curve be a better comparison basis than the IS350, which is basically just a shortened GS350, with just about everything else being constant and only the weight being the variable?

Och

iTrader: (3)

Oh by the way, my 2gs430 rapes current avalon easily

CK6Speed

iTrader: (1)

You are right. I totally forgot about the gear ratio. I was just basing it off the power to weight.

XeroK00L

OK...after I cooled off a bit and looked back, I realized that gear changes really can't be disregarded, as the time it takes to make a shift will remain the same regardless of horsepower increases, so the acceleration time need to be subtracted by the shift time (1x or 2x, depending on whether the car reaches 60mph on the 2nd gear or the 3rd) first before it can be considered linearly proportional to the car's weight.

So by fuzzy math I say the final number should be closer to 5.5s instead.

Gojirra99

Why don't you do some 0-60 estimations for the GS460 as well ? making some assumptions about it's weight, hp ..380 ? 388 ? 400 ?

XeroK00L

Hmm if the 4000+lbs. E39 M5 can accelerate from 0-60mph in 4.7s with 400hp, I say 4.9s won't be too far off for the lighter GS460 with 380hp (hopefully 390hp?).

rominl

iTrader: (4)

would be nice, but i am already very happy if the car can do low 5 just like the is350. that probably make more sense, with the gs350 doing mid to high 5. anything sub 5? leave it to the performance version (if it comes, hahah)

Gojirra99

The standard for any performance division cars now should be 4.5 sec at most, sub 4 sec.even better

XeroK00L

Haha, let's wait till the official numbers for the LS460 are out and we'll have a more credible basis to guestimate the GS460's.

Hopefully when Lexus says <5.5 for the LS460 they really mean something like 5.1s.

rominl

iTrader: (4)

yup, that's why i said i would be surprised if the gs460 enters the sub 5 category