Like the title says, is the upgrade to an unknown (probably high) mileage VLSD for around $100-$120 w/axle stubs a cost-effective option for a rallycross Miata? Mixed opinions abound on its effectiveness for autocross/track, but I'm seeing some info about heat generation that might make it more effective off-road. Is it true that under normal use, it doesn't generate enough heat to get lockup? Seems to me that a low-traction situation like snow or dirt/mud might make it easier to ultimately lock both tires, and wouldn't one wheel constantly spinning generate more heat than road use anyway?
Obviously it won't be WORSE than my open diff, but I try not to spend money needlessly either.
VLSDs can wear out over time. Unless it is a low mileage example, it might very well be open by this time.
The one I had in my Miata blew up after very little spirited driving (two autocrosses), but it had tons of miles on it. There's a reason people don't like them.
Blowing up isn't the VLSD, it's the ring and pinion. But yeah, they lose effectiveness. I think the viscous fluid breaks down. They probably would be at their best with massive wheel speed differences.
I'd save up for a Torsen instead.
I'd save up for a rx7 clutch LSD instead.
EvanB wrote:
I'd save up for a rx7 clutch LSD instead.
Good idea. Gives most of the dirt-driving benefits of the VLSD (by having some pre-load) but without the VLSD issues.
rslifkin wrote:
EvanB wrote:
I'd save up for a rx7 clutch LSD instead.
Good idea. Gives most of the dirt-driving benefits of the VLSD (by having some pre-load) but without the VLSD issues.
It has worked well for me. It can be done for cheaper than a torsen but requires some work and searching out the different parts.
