Mechanical vs. E Diff
11-23-2018, 12:50 PM
#1
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Mechanical vs. E Diff
While the manual GT3 has a mechanical diff and the PDK version has an electronic one instead, what are the weight differences and which one provides better traction mid corner and out of corner?
11-23-2018, 01:06 PM
#2
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The Pdk transaxle including e-diff is 37 pounds heavier (not sure how much e-diff contributes). Both have great traction, but long-term effectiveness of manual version has yet to be established...
11-23-2018, 01:39 PM
#3
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11-23-2018, 01:55 PM
#4
The ediff still has mechanical plates and is just electronically actuated, as opposed to the fully electronic system on Mclarens. I think the ediff on the Porsche is one of the most important factors in its handling, responding much faster out of the corner and allowing it to stay open under braking. I sometimes hear people saying that they prefer the feel of the mechanical diff to the ediff, but in actual fact the ediff does what the me mechanical one does, only much faster, and can do things that are not possible with a mechanical diff at all.
11-23-2018, 02:17 PM
#5
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McLarens don’t have an LSD at all. They just apply the brake to a spinning wheel and use braking of the inside rear wheel to enhance turn-in to a corner.
Porsche’s e-diff locks more under braking (opening causes instability while on the brakes). The Manual LSD does the same.
Porsche’s e-diff locks more under braking (opening causes instability while on the brakes). The Manual LSD does the same.
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11-24-2018, 08:58 AM
#8
I have driven both, have a manual, friend having a pdk, I cannot notice a difference, although that may change over mileage, but i would guess it would take 100k to see a change. I was always under the impression all LSD wear equally electronic or not, just the feeling of engagement that was different. I can see the E diff being more "exact" and having a better performance increase if it is involved with the ECU on the car and all the Nanny's are active. Should allow it to open and close dependent on the system,. That would be the, or should be the opposite on the manual diff. it would not respond tot he ECU and stay engaged or open when enough load is removed from the diff. I guess its in milliseconds, the diff on these cars are so tight in tolerance, I cannot feel it.
11-24-2018, 11:42 AM
#9
Three Wheelin'
Matt/GTGears related post in the GT4 forum -
https://rennlist.com/forums/gt4/8959...l#post12762902
The PTV+ e-LSD in the 991 GT3s is an engineering marvel. I don't think you will need to replace it. Having seen them first hand and reviewing how they function we currently have no plans to make one or offer parts for them. It's just that good.
PTV LSDs are another story. The GT4 is a PTV car and as people start driving them hard and finding the limits they will decide they want an LSD, especially since it will have the same hot rear brakes problem that the 987s have suffered from.
PTV LSDs are another story. The GT4 is a PTV car and as people start driving them hard and finding the limits they will decide they want an LSD, especially since it will have the same hot rear brakes problem that the 987s have suffered from.
11-24-2018, 09:09 PM
#10
Drifting
11-24-2018, 09:33 PM
#11
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11-24-2018, 10:38 PM
#13
Three Wheelin'
11-24-2018, 11:43 PM
#14
Drifting
11-25-2018, 12:39 AM
#15
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