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Thread: Freelander rear differential

  1. 19th February 2009, 07:53 AM #11
    SuperMono's Avatar
    SuperMono
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    An R1 will have a secondary reduction (final drive) ration of about 2.7-2.8:1 as standard and will top out at something a south of 300kph given enough room. Tyre sizes (rolling) on a R1 would be close to a typical 17inch motorsport tyre for a car so in theory your ballpark 3.2:1 diff will get you to 220-250kph or thereabouts.

    I think the Aussie Racing cars (with Yamaha XJR motors) run a 3.3:1 diff on shorter tracks and a 2.5:1 at Bathurst.
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  2. 19th February 2009, 07:44 PM #12
    Harry_Tuttle Guest
    Yep, gearing is not so straight forward on the R1.

    I am basing it on a friends R1 Fisher Fury in the UK which runs a Ford Sierra diff and that is 3.38:1 and tops out in 6th at 12,000rpm at 130 mph....

    So anywhere around 3.4:1 will be about right, 4.1:1 just way too short. Still not sure 130 mph in a Fiat 126/500 will be too safe....

    Just need to find a sensible jap diff close to this ratio I guess.
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  3. 21st February 2009, 08:36 PM #13
    Harry_Tuttle Guest
    Just done some research and SuperMono was pretty much spot on !

    The secondary reduction is 2.688:1 on the 2003 R1......
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