anyone got an LSD taking up too much space in their garage?
Discussion
GreenV8S said:
My S2 had the standard open diff and it handled quite nicely on a dead flat surface but if the car was moving around it was hard to predict whether it was going to spin one wheel and understeer, or spin both and oversteer. It would often wobbly uncomfortably between the two over undulations.
The viscous diff that the V8S came with was better in that it gave consistent handling and good traction at high speed, but at low speed it behaves almost like an open diff and needs a considerable amount of wheelspin on the inside wheel before it starts transferring torque to the outside wheel. This is inherent in the design of the diff because it works based on the speed differential between the two wheels. That could be viewed as an advantage around town if you want a car that is easy to park, but it means accelerating hard out of slow corners you're smoking the inside tyre and throwing traction away. OK in that it is predictable, but still cr@p.
A friction plate diff or any of the gear-based diffs that work on friction is better because it will transfer torque at zero slip under high load but still allow differential movement under low load. If your priorities are performance and handling, I suggest this is the type of diff to go for.
Lols I am sure you are generally correct.. My VC was installed and tuned to 120NM by Bara Motorsports http://www.baramotorsports.com/viscous_couplings.h... and yes it's not quite as good as my old Quaiffe but it's not far off and 1/3 the price.. It doesn't behave very differently at all and feels more stable as it doesn't scrabble for grip like the ATB. The viscous diff that the V8S came with was better in that it gave consistent handling and good traction at high speed, but at low speed it behaves almost like an open diff and needs a considerable amount of wheelspin on the inside wheel before it starts transferring torque to the outside wheel. This is inherent in the design of the diff because it works based on the speed differential between the two wheels. That could be viewed as an advantage around town if you want a car that is easy to park, but it means accelerating hard out of slow corners you're smoking the inside tyre and throwing traction away. OK in that it is predictable, but still cr@p.
A friction plate diff or any of the gear-based diffs that work on friction is better because it will transfer torque at zero slip under high load but still allow differential movement under low load. If your priorities are performance and handling, I suggest this is the type of diff to go for.
If you have the cash go for a plate or ATB but don't be put off the VC in standard or even better in tuned form they still make a huge difference over standard.. So I wouldn't call them crap.. Just not quite as good as the more expensive options. I'd say you get 80 - 90 % of the benefit.
Just IMHO cheers
Damian S3
Edited by DamianS3 on Saturday 20th August 23:29
Edited by DamianS3 on Saturday 20th August 23:30
I noticed an improvement with the viscous diff, personally. Mine's from a Sierra Cosworth 2wd, so has the same 3.64 ratio as the original open diff, but uses 108mm CV joints, not the 100mm usually used. I had to have custom driveshafts made!
The V8S and S4 used the Sierra XR4x4i 2.9 diff, which was a 100mm output type but with LSD fitted. Can't remember the ratio, but think it was 3.38, which to me was too tall for the V6 in the S1, hence why I was keen to keep it the same as stock.
And I can safely say my rear wheels turn in the same direction if you rotate one of them.
The V8S and S4 used the Sierra XR4x4i 2.9 diff, which was a 100mm output type but with LSD fitted. Can't remember the ratio, but think it was 3.38, which to me was too tall for the V6 in the S1, hence why I was keen to keep it the same as stock.
And I can safely say my rear wheels turn in the same direction if you rotate one of them.
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