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Old 10 May 2006, 13:50 (Ref:1605112)   #1
hillclimber26
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hillclimber26 should be qualifying in the top 10 on the grid
Hillclimb Final Drive Ratio

To all you Hilcllimbers out there.

I have a friend who has recently accuried an old Jedi Chassis. He is planning to put a Hayabusa engine in it to run in clubbie hillclimbs and sprints.

We could not agree on a final drive ratio for the engine to the output sprocket. I was wondering if any of you guys might know what a Force/OMS/Jedi/DJ might run?

Thanks

Jim
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Old 11 May 2006, 10:39 (Ref:1605873)   #2
Hitech
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13/48 would be a start if he is running 22 inch tyres or equivalent. If he is a novice though this might be a bit fierce, so +in this case drop it to to 14/48
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Old 11 May 2006, 13:44 (Ref:1605990)   #3
hillclimber26
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Thank you Hitech. Looks like I lost the argument! That would give a very short 1st gear. I take it that means you can use 2nd gear as a start gear perhaps?

Yes we are begginers, so maybe 14-48 would be best to start with then! I think Avon recommended 570/250 R13 tyres which is roughly 22".

Jim

Last edited by hillclimber26; 11 May 2006 at 13:48.
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Old 11 May 2006, 14:47 (Ref:1606029)   #4
DaveK
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On the force we used a 14/48 with the std 1300cc engine and a 15/48 with the 1585cc engine, on 250/570-13 radials

Tyre cleaning/paddock driving is done in 1st and start are in 2nd.

Email me if you want a gear chart with the gear speed etc for the busa

Dave
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Old 11 May 2006, 22:24 (Ref:1606444)   #5
glenn22481
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Another Jedi

Good to see another one being used for hills, great little cars..

Mine isnt a busa motor, its a gsxr1100 (1370cc BB conversion) so Im not sure what the diff in gear ratios are, but if any use I run a 15/48 on 21" rubber.

I can e-mail you an excel spreadsheet if you like - it lacks a bit but if you need it just e-mail me tanky%srgsy.co.uk (change % for @).

If anone has a better one for a gsxr 1100 i'll take a copy too

regards
glenn
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Old 12 May 2006, 06:49 (Ref:1606697)   #6
hillclimber26
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Thanks Guys. Most helpful. Thanks for all your offers of spreadsheets and things. That might be a little too complicated for me at the moment. The Jedi is a great little car. Well put together and relativly simple to work on. We are picking the engine up next week.

Myself and Jeremy are going to Shelsley Walsh on Saturday as I would think there should be a couple of single seaters with motorbike engines in?? Anyone know who might be there? Do you think it would be OK to ask around for some advice?

Thanks

Jim
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Old 18 May 2006, 18:52 (Ref:1613670)   #7
THR
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THR has a lot of promise if they can keep it on the circuit!
yea ask around, most people very helpful (just not some)

Gear it for about 115mph ish in top id say!
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