What is the rear gear ratio for the ISF - Club Lexus Forums


What is the rear gear ratio for the ISF

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Old 07-29-08, 10:13 AM   #1
SC430inVA
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Default What is the rear gear ratio for the ISF

and what gear on the tranny gets you 1:1

thanks

al
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Old 07-29-08, 01:25 PM   #2
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6th gear is 1:1
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Old 07-29-08, 06:05 PM   #3
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Everything you need to know is here:

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Old 07-29-08, 10:01 PM   #4
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wow this thing can hit 85 in reverse.... i'd like to see that!
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Old 07-30-08, 06:37 AM   #5
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Default thanks lobux

that about says it all.

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Old 07-30-08, 08:07 AM   #6
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269mph in 8th gear, that would be insane
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Old 07-30-08, 02:47 PM   #7
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Compare the IS-F's rear gear to the M3's 3.846. I know why the M3 needs it (less torque), but what are the odds of getting a slightly more aggressive aftermarket gear on the F?
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Old 07-30-08, 09:00 PM   #8
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Quote:
Originally Posted by nuttybar08 View Post
Compare the IS-F's rear gear to the M3's 3.846. I know why the M3 needs it (less torque), but what are the odds of getting a slightly more aggressive aftermarket gear on the F?
Near zero unless the IS-F starts showing up with the OEM differential in some racing series. The diff for the IS-F is unique among 2IS cars, and only the IS350 diff has the same bolt pattern to mount the unit in the rear subframe. I seriously doubt the IS350's diff is up to the task of handling the IS-F's input for the normal diff service life (300k miles) but you might could put the 350 piece in for a test. It's a 4.083:1 ratio, so it would make the IS-F a tire shredder.

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Old 07-31-08, 01:03 PM   #9
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Quote:
Originally Posted by lobuxracer View Post
It's a 4.083:1 ratio, so it would make the IS-F a tire shredder.
I was thinking something in the 3.23 range.
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