Re: [DMCForum] DeLorean Differentials (was: Re: Racing)

[Martin Gutkowski <martin@xxxxxxxxxxxxxx>]

I'm not the Lotus expert here but I know the S1 and S2 used a Citroen 
box, not a UN1, and all the Esprits with Renault UN1's had a 3.44:1, 
same as us - but my information is secondhand, though from reliable sources

I've spoken at some length to a Renault/PRV and gearbox specialist who 
confirmed that of the several hundred esprit boxes he has rebuilt, all 
are 3.4:1
The principle difference between the UN1 and the 369 is simply that it 
has an extra linkage for the crossgate whereas the 369 just uses the 
main crank. The UN1 is designed for two cables rather than rod and 
cable, like ours.

I've heard conflicting stories as to whether Lotus strengthend the 
internals on their gearboxes. Certainly on the late turbos and the V8's 
they quite easily twist driveshafts, and a LSD is a good investment if 
you drive them hard. They hit the same problem as us with the input 
shaft coupler, and have an additional problem with 5th which is taller

I'm not arguing with you that it's a bad idea to lower the final drive - 
I'm doing that with mine. Although the alpines have the same final 
drive, their wheels are smaller.

Martin

therealdmcvegas wrote:

> --- In DMCForum@xxxxxxxxxxxxxxx, Martin Gutkowski <martin@xxxx> wrote:
> > Actually the Esprit and all the Alpines have the same as ours - 3.44:1
> > But the esprit has a taller 5th which they break
> >
> > Martin
>
> The Alpine may have a 3.44:1 differential, but the Esprit certainly
> does not! Going thru this list, I've not seen a single Esprit which
> has had anything less than a 3.88:1
>
> http://www.lotusespritworld.co.uk/models.html
>
> In fact, on certain 4-cylinder, N/A engines, Lotus was kicking
> differentials up to 4.38:1!
>
> http://tinyurl.com/8wsy9
>
> Going thru that list too, Lotus labeled the Renault transaxles as UN-1
> types, followed by the number suffix as the individual model # of the
> UN-1 platform. I also have an Eagle Premier "Service Highlights" book
> that calls the transaxle a UN-1, with the number being the model
> suffix. It even shows a diagram of how to read the transmission tags.
>
> -Robert
>
>
>
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