Bud, this works for all manual trans. but will use a 4 speed for
illustration. Lay gear(cluster gear) 4th divided by main shaft 4th X
whatever main shaft gear you choose divided by laygear equivalent =
ratio for that gear. Example - laygear 4th is 33 teeth, main shaft 4th
is 22 teeth. Main shaft 3rd is 27 teeth and lay gear is 29 teeth. So 33
divided by 22 = 1.5 x 29 divided by 27 (1.08) = 1.61(3rd gear ratio)
Lay gear (direct) divided by main shaft gear (direct)? X what main shaft
gear you choose divided by equivalent lay gear = ratio for that gear
On 1/10/2018 5:41 PM, Bud R via Fot wrote:
> Listerati,
>
> I?ve been trying to figure out what gear ratios I have in the gearbox that
> came with my race car but don?t know how to do the proper math. The PO told
> me it was a close ratio GT6 gearbox but one never knows until you actual
> check.
>
> I at least took some ?data? while it was out so I?m hoping someone can tell
> me how to figure out the gear ratios and if it is indeed close ratio GT6
> gears or whatever it might be.
>
> When the input shaft was turned one full rotation the output shaft turned the
> following amount.
>
> 1st gear it turned 1/4 turn
> 2nd gear it turned 1 1/8 turns
> 3rd gear it turned 1 5/8 turns
> 4th gear it turned 1 3/4 turns
>
> Any help on how I should do the math is appreciated.
>
> Also does anyone know what happened to the minty lamb gearspeed website? It
> does not appear to be up any longer and I used to play with it a lot. Very
> useful site that now appears gone. Waaahhhh.
>
> Thanks
> Bud Rolofson
>
> Extreme Parts Racing (more than just a haircut)
>
> 71TR6 CC57365 (Good 6)
> 71 Spitfire MK IV Race Car #3
> 69 Spitfire MK III (back up FE engine/dinghy car)
> 93 Minnie Winnie Race Support Vehicle
> 77 Z-50A Hardly Davidson Honda Mini-Trail Bike (Triumph Pit Bike)
>
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