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I am looking into purchasing an ISF and in my research I have seen everything from 4.4 sec - 4.9 sec. 0 - 60 times. What would the most accurate 0-60 time be for a stock ISF? What about the 1/4 mile? Road and Track has it at 4.4 sec. 0 -60, 10.2 sec. 0 -100 and 12.8 @ 113.3 mph in the 1/4 mile.
 

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JVRAC....take a look below!


Straight from: lexus.com/models/ISF/detailed_specifications DOT html

0-60 MPH Acceleration 4.6 seconds
1/4 Mile Acceleration 13.0 seconds
Top Track Speed (electronically limited) 170 mph
EPA Fuel Economy Ratings (city/highway/combined) 16/23/18 mpg
Aerodynamic Drag Coefficient 0.30
Turning Circle 33.5 ft

Also...

416 hp @ 6,600
Torque at RPM 371 lb-ft @ 5,200
Rear-wheel drive with TORSEN® torque-sensing limited-slip rear differential

From the same site I listed above you can download a PDF detailing the 2011 IS-F Warranty and Services Guide


Cheers,
Curtis
Lexus of Bellevue
425-213-1882
 

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Yes, my IS350 was faster than some of the above quoted times. Sport mode, Normal, Snow Mode testing differences maybe? I find fastest is of course in tiptronic mode.

Stupid question time...past a certain RPM it sounds like there is a second air intake kicking in but from the installation videos of the K&N typhoon it looks like there is only one air intake. What's up with that?

PS

I would love to install the K&N but not CA legal, crazy bastards
 

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It depends on who conducts the test and test conditions but below are a couple posted times.

Car & Driver
0-60 4.2 secs
1/4 mile: 12.7 @114mph


Both of these mags use "roll-out" which don't start timing the runs until the wheels have moved across the starting line, which is 12 inches past where the wheels are parked. Not factoring in roll-out adds about .3 seconds which is where Lexus got its 4.6s time, which is how AMCI (and Edmunds) test their vehicles.
 

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It depends on who conducts the test and test conditions but below are a couple posted times.

Car & Driver
0-60 4.2 secs
1/4 mile: 12.7 @114mph


Both of these mags use "roll-out" which don't start timing the runs until the wheels have moved across the starting line, which is 12 inches past where the wheels are parked. Not factoring in roll-out adds about .3 seconds which is where Lexus got its 4.6s time, which is how AMCI (and Edmunds) test their vehicles.
Never knew that. Where did you come up with that info?
 

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Never knew that. Where did you come up with that info?
I work for Edmunds. Here's how we test our cars (and why our numbers 'appear' slower than the mags' sometimes:

insideline.com/features/how-we-test-cars-and-trucks.html

[sorry i can't embed the link since my post count is too low]

For the TL;DR version, scroll down to "A few words about rollout."
 

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Heh, or I could just post it here:


A Few Words About Rollout
The term "rollout" might not be familiar, but it comes from the drag strip. The arrangement of the timing beams for drag racing can be confusing, primarily because the 7-inch separation between the "pre-stage" and "stage" beams is not the source of rollout. The pre-stage beam, which has no effect on timing, is only there to help drivers creep up to the starting position. Rollout comes from the 1-foot separation (11.5 inches, actually) between the point where the leading edge of a front tire "rolls in" to the final staging beam — triggering the countdown to the green light that starts the race — and the point where the trailing edge of that tire "rolls out" of that same beam, the triggering event that starts the clock. A driver skilled at "shallow staging" can therefore get almost a free foot of untimed acceleration before the clock officially starts, effectively achieving a rolling-start velocity of 3-5 mph and shaving the 0.3 second it typically takes to cover that distance off his elapsed time (ET) in the process.

We believe the use of rollout for quarter-mile timed runs is appropriate, as this test is designed to represent an optimum drag strip run that a car owner can replicate at a drag strip. In the spirit of consistency, we also follow NHRA practice when calculating quarter-mile trap speed at the end of the run. So we publish the average speed over the final 66 feet of the quarter-mile run, even though our VBOX can tell us the instantaneous speed at the end of the 1,320-foot course, which is usually faster.

On the other hand, the use of rollout with 0-60 times is inappropriate in our view. For one, 0-60-mph acceleration is not a drag-racing convention. More important, it's called ZERO to 60 mph, not 3 or 4 mph to 60 mph, which is what you get when you apply rollout. While it is tempting to use rollout in order to make 0-60 acceleration look more impressive by 0.3 second, thereby hyping both the car's performance and the apparent skill of the test driver, we think it's cheating.

Nevertheless, some car magazines and some automobile manufacturers use rollout anyway — and fail to tell their customers. We've decided against this practice. We publish real 0-60 times instead. But in order to illuminate this issue and ensure we do justice to every car's real performance, we've begun publishing a clearly marked "with rollout" 0-60 time alongside the primary no-rollout 0-60 time so readers can see the effects of this bogus practice.
 

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Times really depend on the driver but you should expect about 4.5 seconds approximately for 0-60 and a quarter time from 12.5 to 13.0. Again it depends on conditions and driver. Add a few goodies and it becomes much faster. For example you can spend about roughly 3,000 dollars with exhaust and sikky headers and reach the 11's in the quarter mile if you are a skilled driver.
 

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Im a little confused....are you really going to let a 0-60 average of about .5 from different testers determine if you buy an "F" or not. I have never herd of anyone walking into a dealership and asking quarter mile times. this is an excellent car, with great quality of build and service. all you really need to do is go for a test drive and you will be hooked.
 

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Im a little confused....are you really going to let a 0-60 average of about .5 from different testers determine if you buy an "F" or not. .
Good point. If you test drive one you will most likely buy it.

I typically look at 1/4 mile trap speeds as a better indicator of power than 0-60mph. Trap speeds take out the rolling and traction issues. Most stock trap speeds for the F are 110mph + with most between 112-114mph which seems plenty quick to me. So fast that it seems like the 416HP engine is under rated for pulling a 3,800 pound sedan to that speed while covering the 1/4 mile.
 
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