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Home > Help Needed / General Tech Chat > drop gears (ratio)

miniman

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derbyshire

16th Feb, 2005 at 09:44:25pm

im buying new straight cut drop gears to go with sccr gearbox rebuild, anyone now best ratio to stick with? im runnin metro turbo diff ratio of 3.2 i think and 13"inch wheels, is it best to go 1:1 and keep a bit of top or is it a major difference goin 1:.8,
help is most kind, i not gonna be trackin all the time so i want all round performance i suppose, also is this a good diff ratio?

wil_h

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Betwix Harrogate and York

17th Feb, 2005 at 07:28:45am

I'd stick with 1:1. Other drop gear ratios (I think) are really for fine tuning the diff ratio which isn't really that important unless you're racing.

I think that 2.9 is a popular FD ratio on big power turbos (but that's with 10s) so 3.2 on 13" sounds about right. That's a guess. But it wouldn't take long to work out speed v. RPM for both for a comparison.

Wil

Fastest 998 mini in the world? 13.05 1/4 mile 106mph



On 2nd Jan, 2013 fastcarl said:
the design shows a distinct lack of imagination,
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On 20th Apr, 2012 Paul S said:
I'm mainly concerned about swirl in the runners caused by the tangential entry.


miniman

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127 Posts
Member #: 439
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derbyshire

17th Feb, 2005 at 07:38:14am

cheers mate, 1.1 it is then

Vegard

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I pick holes in everything..

Chief ancient post excavator

Norway

17th Feb, 2005 at 08:11:01am

Which gear ratios are you running?? A 2.9 diff and a S/C C/R gearbox would be HORRIBLE. An S/1300GT set on the other hand would work fine with that FD.

On 13th Jul, 2012 Ben H said:
Mine gets in the way a bit, but only when it is up. If it is down it does not cause a problem.

Mike

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Sunny Sussex

17th Feb, 2005 at 10:44:02am

good topic as i was wondering about this.

BENROSS

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Resident Cylinder Head Modifier

Mitsi Evo 7, 911, Cossie. & all the chavs ...... won no problem

17th Feb, 2005 at 12:09:46pm

have a look at the website of stuart gurr of V MAX SCART *wink*
has some pritty intresting g/ boxes for sale

thought its worth a mention.



Stuart has a wealth of knowledge and experience and I would class him as one of the top gurus Of the A series.

*smiley*

miniman

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127 Posts
Member #: 439
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derbyshire

17th Feb, 2005 at 06:19:33pm

im runnin a 3.2 fd from metty turbo.

Mike

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Sunny Sussex

22nd Mar, 2005 at 11:13:25am

on 1:1, whats the teeth config for them? For example i believe a 23 tooth primary is a good stong one, so what number of teeth are needed for the idler and input gears to achive a 1:1 ??

Vegard

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I pick holes in everything..

Chief ancient post excavator

Norway

22nd Mar, 2005 at 02:40:57pm

What indicates the ratio is to divide the primary number of teeth into to the input gear. If the primary is 23teeth and the input 23, you've got 1:1 The idler doesn't matter at all.

On 13th Jul, 2012 Ben H said:
Mine gets in the way a bit, but only when it is up. If it is down it does not cause a problem.

Mike

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Sunny Sussex

22nd Mar, 2005 at 02:54:20pm

oh right, thnx :)
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