I can't find it, but do people like the e-diff over the mechanical limited slip diff?

Is there a way to tell from looking if a 2015 V8S or R has a limited slip diff?

 

No V8 has an LSD. Only the V6S.

I don't think many people can tell the difference, but i'm not one to weigh in here. I can say that it certainly isn't needed in the V8.

 

Interesting. Ok. I thought I read the V8S and R have an electronic lsd.

 

That's completely different. All of the vehicles have an LSD by that definition. They aren't really the same at all, but they do the same thing. Traditionally mechanical LSD's have performed better than electronic differentials, but in the past few years E-diff calibrations and usages have become much better. Hard to tell the difference in some vehicles.

 

So do people want the mechanical or the e-diff?

 

Honestly its all about opinion. I don't think most people care either way, because they both work fine.

 

So what do you think the E-Diff is?

It's an electrically actuated mechanical LSD.

GKN Driveline ETM (Electronic Torque Manager)

 

Personally, I prefer LSD and was the key reason to get S over base. It makes car much better at both putting power down and recovering from a slide. If all you do is drive on the street - you won't notice the difference. If you take it on the track - you got to get LSD. The real one.

I have another car with "simulated" LSD, where ABS-like action on an individual wheel simulates LSD. In the snow (it is my winter car) it works about as well as LSD. However, you can't slide that car around at all. Even with traction turned off, it kicks in and you lose power and gain traction - so it does limit fun a great deal. Now, my winter car isn't F-type, however I suspect JLR has a better system than that in SVR. However, I yet to drive one on the track.

 

The base car does not have an LSD. The major disadvantage to the E-diff on the V8 cars is that it eventually shuts down after it overheats from extended high speed laps. The mechanical LSD will hang in there.

 

Does the base car not have an e-diff? Perhaps my bad there, for some reason I thought it did. Agreed on the overheating problem, big disadvantage at the track without advanced cooling.

 

By definition this differential isn't limiting slip. Its a torque transfer device more similar to a PTU than an actual differential. You can program it to do the same thing, but its a reactive device and not a proactive one. I agree they are very similar, but they have a completely different construction and if you loose one of any number of electrical inputs it is, at its core, an open diff.

 

I got S for LSD and active suspension. Previous was an SLK55 with neither and while very fast it was a handfull! Eventually took away from fun.

 

If I recall correctly, there is a forum member who had issues in winter driving due to overheating also.

 

Correct...the base car has no E-Diff or LSD, just an open pumpkin.

 

People don't "like" one over the other because you don't get to pick.

All V8 F types have an electronic diff.

V6 base = open diff

V6S = mechanical LSD

V8 (all) = electronic LSD


Dave

 

....and the single biggest reason I'd buy the V6S over the V6 base would be to get the LSD

Dave

 

+1. That was the only reason I got the V6S.

 

So using my dumb question of the day, has anybody with a base put the "S" mechanical LSD as a retrofit ? I'm sure someone in a shed somewhere has had a go..

 

Not a dumb question, I've been wondering this myself for a while.

The V6 XE also has an open diff, and there isn't an option for a factory LSD in any trim. Swapping the LSD from an F-type V6S seems like the best option, but no idea if its feasible. The final drive ratios are different between the base F-type and V6S, as well as between the XE and F-type V6S so there would need to be some software modifications. I suspect the XE diff and base F-type diff are identical but haven't confirmed.

I recall reading a thread where Cambo tried to swap the diff in a jag and ran into tons of trouble trying to get change the software in the transmission/ECU to recognize the new final drive ratio. Not sure if he ever solved this problem, but it is really the only hurdle I see to doing a diff swap at this point.

 

I put a close-ratio gearbox w/LSD from an '05 MINI into my '02, and it disabled the cruise control in all gears except 3rd. A very worthwhile trade off.