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

isf gear ratio?anyone know the top speed per gear?

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Old 01-19-15, 09:07 AM
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Ltaboso
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Default isf gear ratio?anyone know the top speed per gear?

Anyone know the top speed per gear with stock 19s and stock tires?
Old 01-19-15, 12:15 PM
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Gymkata
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With a 6800 RPM redline, 255/35R19 rear tires, and a 2.94:1 final drive axle ratio, the theoretical redline-limited top speed in each gear is as follows:

1st - 4.60:1 - 38 mph
2nd - 2.72:1 - 65 mph
3rd - 1.86:1 - 96 mph
4th - 1.46:1 - 122 mph
5th - 1.23:1 - 145 mph
6th - 1.00:1 - 179 mph
7th - 0.82:1 - 218 mph
8th - 0.69:1 - 259 mph
rev - 2.18:1 - 82 mph
Old 01-19-15, 12:31 PM
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flowrider
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All spelled out in this thread:

https://www.clublexus.com/forums/is-...r-the-isf.html

Lou
Old 01-19-15, 02:24 PM
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ISFpat
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We can go 82mph in reverse? sweet!
Old 01-19-15, 07:20 PM
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SoCalISF
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Originally Posted by ISFpat
We can go 82mph in reverse? sweet!
Hahaha! Just the mental image made my rough Monday not so bad after all!
Old 01-19-15, 10:15 PM
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Ltaboso
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so basically on flat out....7th and 8th gear will never be used? only for city driving to conserve gas?
i was wondering if there are any final ring gear mods so the top speed per gear can be adjusted so we can use all gears ..... but from what i read and watched,changing to 4.0 final ring gear will have a speed cut on 120mph?

Last edited by Ltaboso; 01-19-15 at 10:30 PM.
Old 01-21-15, 09:21 AM
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calteg
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Originally Posted by Ltaboso
so basically on flat out....7th and 8th gear will never be used? only for city driving to conserve gas?
i was wondering if there are any final ring gear mods so the top speed per gear can be adjusted so we can use all gears ..... but from what i read and watched,changing to 4.0 final ring gear will have a speed cut on 120mph?
If you had enough real estate, you could use 7th gear to hit 187mph, where the electronic limiter kicks in.
Old 01-21-15, 09:53 AM
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ISFpat
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^ Electronic limiter kicks in at 170mph not 187
Old 01-21-15, 01:21 PM
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calteg
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I stand corrected
Old 01-21-15, 08:00 PM
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2URGSE
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It's funny, I never think about the speed and gears in this car. I'm more busy looking 1/4 of a mile ahead since this car just rockets forward.
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