lotus and LSDs

mwmackenzie · Post by **mwmackenzie** » Wed Mar 09, 2016 2:16 pm

Shug wrote:
van cleef wrote:Isn't the gearbox from a BRM rover be a straight swop with a Torsen LSD as standard? I was searching for one to try out on my vvc but, never could find one when I was looking.
Yup - but the final drive was wrong. I built up a BRM box with the standard final drive, giving a decent close ratio box. Can't remember the ratios off the top of my head, but just chucking the BRM box in would have given funky results - either far too high or low overall. Ideal with the CR gear cluster in it and the standard final drive.

BRM is a close ratio box with a standard long 5th and a torsion LSD

Post by **Shug** » Wed Mar 09, 2016 2:50 pm

mwmackenzie wrote:
Shug wrote:
van cleef wrote:Isn't the gearbox from a BRM rover be a straight swop with a Torsen LSD as standard? I was searching for one to try out on my vvc but, never could find one when I was looking.
Yup - but the final drive was wrong. I built up a BRM box with the standard final drive, giving a decent close ratio box. Can't remember the ratios off the top of my head, but just chucking the BRM box in would have given funky results - either far too high or low overall. Ideal with the CR gear cluster in it and the standard final drive.
BRM is a close ratio box with a standard long 5th and a torsion LSD

Nope. It's a close ratio cluster (inc 5th) with a standard 3.9 final drive. Makes it a bit long legged in all gears - the Lotus close ratio box has a 4.2 final drive, which is what I transplanted in (crownwheel and pinion shaft) to make the ratios inc final drive exactly the same as the Lotus CR, but with the addition of a Torsen diff.

mwmackenzie · Post by **mwmackenzie** » Wed Mar 09, 2016 3:01 pm

Shug wrote: Nope. It's a close ratio cluster (inc 5th) with a standard 3.9 final drive. Makes it a bit long legged in all gears - the Lotus close ratio box has a 4.2 final drive, which is what I transplanted in (crownwheel and pinion shaft) to make the ratios inc final drive exactly the same as the Lotus CR, but with the addition of a Torsen diff.

Ah...

Post by **campbell** » Thu Mar 10, 2016 6:53 pm

Mike Scib wrote:Is the issue with fitting a LSD to the Elise not that it can cause understeer in slower speed corners as the front end is pretty light?

I have never felt my car requires a LSD even with 260bhp

https://www.youtube.com/watch?v=jDf9YEnIUFQ

Jump to 8.20.

Enjoyed that, Mike. Quite fancy an SC now.

Anyone want to buy an Evora then?!

Dan22h · Post by **Dan22h** » Thu Mar 10, 2016 7:22 pm

I can't really comment from a technical point of view, only my experience of how the car felt to drive so here goes..
On road tyres (ad08's) the car would noticeably understeer if any sort of power was applied through the corner, on track tyres (r888's) I never noticed any understeer, on both sets of tyre's I found the car to be much more controllable in oversteer and I found driving the car to be more entertaining. Overall if I was to do it again I would choose the LSD as I had more fun with it fitted, especially Knockhill before I blew the engine clean in half..

Spec of car was an s1 with mems3 VVC running circa 170bhp with close ratio box and Torsen LSD.

Scuffers · Post by **Scuffers** » Thu Mar 10, 2016 9:42 pm

mckeann wrote:Simon Scuffham will tell you that it causes understeer, and it only tries to mask the problem of too much roll, so better to just fix the problem of roll rather than try to mask it with an LSD.

I don't know myself, but I'd be inclined to agree with him.

blimey!

and yes, I still think the same, even with 700hp it's not mandatory, unlike decent suspension setup.

Scottish Elises

lotus and LSDs

Re: lotus and LSDs

Re: lotus and LSDs

Re: lotus and LSDs

Re: lotus and LSDs

Re: lotus and LSDs

Re: lotus and LSDs