Thread: Homemade FNR

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    Homemade FNR
    #1
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    Got a gearbox with the diff was looking at it today and came up with the idea to make an FNR
    The diff drive gear is a 4 to 1 reduction gear if I strip out every thing other than 4th gear (1 to 1 ratio) and reverse modifiy the housing to make it alot smaller and there ya go
    4:1 reduction FNR box with a diff

    Was wondering if this has been done before and does anyone have any links to this on the net

    Cheers Reece
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    Re: Homemade FNR
    #2
    Intense Moderator Rat4020's Avatar
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    Thats great but what diff are ya using ? And a couple of picts might help explain better
    The question is not if its gona roll. Its when ..

    That be some kind of church cruzzer or commuter bike thingy ?
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    Re: Homemade FNR
    #3
    The Bob Ross of MBN Bullnerd's Avatar
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    "Speed is time-time is speed"-Dennis Hopper

    Quote Originally Posted by TALON View Post
    did you use a special bigfoot camera or something ,you know all blurry could be a tree stump kinda thing .
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    Re: Homemade FNR
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    Right details for those interested box and diff are from a toyota corrola front wheel drive, toyota mate them up to the 4age motor so 135hp standard and alot of boyracers push them into the 200hp range so should be good for running a busa

    Thanks for the link bull, funny its another kiwi that has done it
    here is the diff

    here are the main shafts

    My daft idea was to take 4th gear, grind the shafts so I can move 4th gear to where 3rd is leave reverse in place mount a bearing on the shafts where 4th gear was
    Modify the shifter rings to work as a pair that way one shift is forward or reverse
    I'd use bulk of the housing as is, diff section plus the bellhousing end wall just trim the bell off, the other end I'd fab up something and machine some bearing mounts
    A fair bit of work but I should end up with a cheap unit that is small-ish and good enough to do the job and the CV's are nice en long and as common as muck
    Oh and I'd set it up for a chain drive, this leaves a weak link that is easy to replace

    So what ya think daft enough it might work?

    Cheers Reece
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