IS F (2008-2014) Discussion topics related to the IS F model

197.6 mph Lexus IS-F - Top Speed Test (Video!)

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Old 03-11-20, 04:45 AM
  #16  
Bast59
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Last time, did between 318 and 320 km/h.
You can easily go to 300 with speed limiter removed
Old 03-11-20, 05:12 AM
  #17  
Yri
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Originally Posted by Vitveet
I have all that, with the limiter supposedly removed, tried a top speed run, and it definitely shut me down at 175....😤. Really need to get them to take a look at that.....limiter is definitely still in tack.

V.
The limiter is probably gone, I don't see how the limiter could be raised, I mean, it might have been raised who knows. Do you happen to have any downforce parts on your car?
Old 03-11-20, 05:30 AM
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Originally Posted by Vitveet
I have all that, with the limiter supposedly removed, tried a top speed run, and it definitely shut me down at 175....😤. Really need to get them to take a look at that.....limiter is definitely still in tack.

V.
Maybe you were in 6th and hit rev limiter, top speed is in 7th without speed limiter
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Yri (03-11-20)
Old 03-11-20, 06:14 AM
  #19  
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Originally Posted by Bast59
Maybe you were in 6th and hit rev limiter, top speed is in 7th without speed limiter
It actually is, I think the speed limiter is in 6th. I don't know if you can bypass the speed limiter by using 7th or 8th, but I do know that 7th is where the top speed is WITHOUT the speed limiter
Old 03-11-20, 10:35 PM
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Originally Posted by Yri
It actually is, I think the speed limiter is in 6th. I don't know if you can bypass the speed limiter by using 7th or 8th, but I do know that 7th is where the top speed is WITHOUT the speed limiter
​​​​​​That's it, speed limiter is at 168mph, you hit it in 6th, and be in 7th or 8th don't change anything, it's always 168. Like he hits 175 and car stops to climb, I think he was in 6th at the rev limiter, if stock speed limiter was not removed, he can't go to 175 like you said.

I've hit rev limiter in 6th one time, was around 180 mph from memories with rev limiter raised at 7000rpm instead of 6800.

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Old 03-12-20, 06:11 AM
  #21  
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Originally Posted by Bast59
​​​​​​That's it, speed limiter is at 168mph, you hit it in 6th, and be in 7th or 8th don't change anything, it's always 168. Like he hits 175 and car stops to climb, I think he was in 6th at the rev limiter, if stock speed limiter was not removed, he can't go to 175 like you said.

I've hit rev limiter in 6th one time, was around 180 mph from memories with rev limiter raised at 7000rpm instead of 6800.

​​​
Yeah, if he upshifted he could have gone faster, it appears he was redlining it. By the way, impressive that 200 RPM can give you an extra 12 mph of speed.
Old 03-12-20, 10:44 AM
  #22  
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Originally Posted by Yri
Yeah, if he upshifted he could have gone faster, it appears he was redlining it. By the way, impressive that 200 RPM can give you an extra 12 mph of speed.
Don't remember well, but think in 6th at 168 mph, we're not at 6800rpm but a little bit less, no ?
Old 03-12-20, 07:04 PM
  #23  
lobuxracer
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Numbers below. This assumes the standard tire size in the rear, 255/35/19. As long as your tire is the same diameter the numbers will be close - there will be more gain from tire growth with wider tires.



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Old 03-12-20, 07:19 PM
  #24  
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Now I’m curious if anyone’s gone 80 mph in reverse
Originally Posted by lobuxracer
Numbers below. This assumes the standard tire size in the rear, 255/35/19. As long as your tire is the same diameter the numbers will be close - there will be more gain from tire growth with wider tires.


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Old 03-12-20, 09:24 PM
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Originally Posted by lobuxracer
Numbers below. This assumes the standard tire size in the rear, 255/35/19. As long as your tire is the same diameter the numbers will be close - there will be more gain from tire growth with wider tires.


Thanks for numbers
Still with the standard tire size in my case, my memories were not so bad when I look your picture, so that 200rpm give an extra 6mph in 6th.

224mph at 7000rpm in 7th, I'm curious to know if without the power of a supercharger we can do it
Old 03-14-20, 09:00 PM
  #26  
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We know that ISF hit 191.1 with RR Racing S/C and Tune with speed limiter disabled at Mojave mile, with full interior with older kit. They now have 780hp kit, Could 196mph run be possible if weight reduction was done? 18in light weight rims, the appropriate tire Type and size, two-piece rotors,lightweight battery spare tire removed rear seats removed, extremely lightweight carbon fiber front seats with speed limiter is disabled with RR Racing tune what cound ISF theoretically be capable of doing top speed given 2mile or 3 mile stretch of road help an unlimited.distant be it w stop accelerating? This is just an exercise for thought for fun.

Last edited by Weapon F; 03-14-20 at 09:10 PM.
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