Gearbox cross ref' Types, Ratios, etc (open for editing)

PostPost by: holywood3645 » Wed Sep 06, 2017 6:51 pm

I got fed up looking this stuff up and figured i'd do a spread sheet with the relevant info. Open for editing, Correction and addition.

gb-capture.jpg and


File

Please email me for file, as site does not allow addition of xls files, of send me data and i will maintain updated info and upload correction/addition.
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PostPost by: Davidb » Wed Sep 06, 2017 7:01 pm

James, that is very useful, thanks for doing it.
One point with the ZF S5/18-3 is that the upper gears on the layshaft press on and can be changed. This allows a pair of 0.80 gears to be used for 5th gear which is far more useful than the 0.874. I acquired a pair of 0.80 gears in the UK for next to nothing since the racing guys place no value on them.
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PostPost by: gjz30075 » Wed Sep 06, 2017 7:17 pm

Lotus 5 speed ratios:
1st - 3.20
2nd- 2.00
3rd - 1.37
4th - 1.00
5th - .80
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PostPost by: Davidb » Wed Sep 06, 2017 7:26 pm

If you change the 5th gear on the ZF as I did you get:

1st: 2.99:1
2nd 1.76:1
3rd 1.30:1
4th 1.0:1
5th 0.80:1

I found these to be very nice, useful ratios-certainly they would work well in a Plus 2

I really liked the dog-leg first gear which meant that 4th to 5th was in the same plane and very fast.
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PostPost by: holywood3645 » Wed Sep 06, 2017 10:22 pm

gb-capture_1.jpg and
Greg (Giz)
Thanks for the 5 speed ratios. And David for info on the 0.80 OD in the ZF.
Do you know how easy it is to change first gear on a ZF?

Here is an update with the latest info

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PostPost by: Davidb » Wed Sep 06, 2017 10:50 pm

James, during a rebuild of the ZF changing the 5th gears is quite simple. On the mainshaft it simply slides off but on the layshaft you need heat and a press, but it is not difficult. You have to figure out which are 5th gear--it is not the end two!
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PostPost by: Davidb » Thu Sep 07, 2017 11:30 pm

Here is a pdf of the workshop manual for the ZF S5/18-3 transmission:

http://www.alfamontreal.info/Montreal/ZFmanual.pdf

It was from this that I learned how to overhaul the box and how to swap ratios on 3rd, 4th and 5th gears.
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PostPost by: holywood3645 » Fri Sep 08, 2017 5:57 pm

David
Thanks for the link to the ZF manual. Great info! The ratios for CAR appear to only reflect a small selection of was is available. Looks a lot more complicated than a 2000E box (the only one i have ever over hauled)
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