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Home > Help Needed / General Tech Chat > final drive ratios for a 5 speed

sandfly

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Member #: 444
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27th Jan, 2005 at 04:45:17pm

hi peeps couple of questions

how do i go about working out what my final drive ratio is as i dont have a clue

what would you recommend as the correct ratio for the best of both worlds acceleration and crusing

also will a helictal pinion and crwon wheel take the kind of punishment my supercahrged 1380 is likely to throw at it

cheers for any info

alex

Tom Fenton
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Rotherham South Yorkshire

27th Jan, 2005 at 04:56:29pm

There is a thread discussing all about this at the moment. Do a search for "Final Drives" or similar.


On 29th Nov, 2016 madmk1 said:

On 28th Nov, 2016 Rob Gavin said:
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turbodave16v
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SouthPark, Colorado

27th Jan, 2005 at 06:04:44pm

Totally depends on what your five speed is - i'll assume it's an overdrive? Even so, you need to find out what kind of overdrive ratio before being able to calculate anything for the 5th gear...

For 10" wheels, don't go higher than a 3.44:1, for 13" don't go higher than a 3.6:1.

I'm sure no-one will disagree when i say Matt Woods has the most powerfull turbo mini out there, and I'm sure he uses a 2.95 diff, which can only be a 'factory cut' helical gear... Should be proof enough for you!

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Jimster
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455bhp per ton
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Sunny Bridgend, South Wales

27th Jan, 2005 at 09:07:15pm

whst make of gearbox are youn going for, are you sure it will take the torque?

Team Racing

On 15th May, 2009 TurboDave said:
I think the welsh one has it right!


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of turbo twinkie in a car and first to
run a 1/4 in one!!

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sandfly

39 Posts
Member #: 444
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27th Jan, 2005 at 09:21:15pm

the box is a jkd straight cut 5 speed with semi helectical crown wheel and pinion
jkd said it would take the power but the proof will be in the pudding as it were

Doodmeister

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Alberta, Canada

27th Jan, 2005 at 11:13:27pm

I've got one of the very early JKD 5speed S/C boxes on a 1450 with 100hp at the wheels and it's sofar lasted more that 10 years touch wood.

Two things are infinite: the universe and human stupidity; and I'm not sure about the the universe.
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