991 GT3 LSD?
#1
991 GT3 LSD?
We all the know the issues with the GT3 LSD's - in particular the 997 GT3 with it's weak 28/40 lock ratios and internals that might not bite when they should.
Does anyone know what the 991 GT3 LSD is going to be or if there even is one, what with PDK, TC, PSM, and 4 wheel steering?
Thanks,
-Christian
Does anyone know what the 991 GT3 LSD is going to be or if there even is one, what with PDK, TC, PSM, and 4 wheel steering?
Thanks,
-Christian
#3
The old LSD with fixed locking ratios is history. The new LSD is constantly variable and electronically controlled. It's hydraulically operated by a pump driven off of the PDK-S gearbox.
Edit: posted before I saw Pete's response above.
Edit: posted before I saw Pete's response above.
#4
#5
Is this like a viscous coupling? Does it being "infinitely variable" make it stronger? Ill google this but interested in hearing more from those in the know. And the best part is we can now stop talking about contrasting stitching options
#7
Porsche says that it's a big part of the handling improvement under all conditions. Even under braking, unlike a mechanical diff, the e-diff is able to completely release the locking effect which allows ABS to operate optimally on individual wheels.
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#8
It is also the reason a manual transmission is not offered
It would've been too difficult to design a pump for the e-diff. This explanation belongs to AP and it is to be believed by little kids waiting for Santa...
#9
The ediffs in the modern fiats are said to be the reason they are so predictable at the limit, unlike past fiats.
RWS is getting all the attention b/c it's a novelty.
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BTW, the 458 came with a manual transmission as an option along with ediff, b/c the pump is external to the gearbox. So, I agree with Rad's prior statement that it's a bit of a cop-out when AP says that a MT car can't have ediff b/c the pump is in the PDK gearbox.
#13
Porsche states:
Another advantage is improved braking behaviour when full braking is required and a complete release of the rear-differential lock enables optimal actuation of the individual wheels during ABS braking, resulting in stable and efficient braking with maximum deceleration.
I don't doubt your statement, so is Porsche touting an "advantage" that isn't really an advantage?
Another advantage is improved braking behaviour when full braking is required and a complete release of the rear-differential lock enables optimal actuation of the individual wheels during ABS braking, resulting in stable and efficient braking with maximum deceleration.
I don't doubt your statement, so is Porsche touting an "advantage" that isn't really an advantage?
#14
Porsche states:
Another advantage is improved braking behaviour when full braking is required and a complete release of the rear-differential lock enables optimal actuation of the individual wheels during ABS braking, resulting in stable and efficient braking with maximum deceleration.
I don't doubt your statement, so is Porsche touting an "advantage" that isn't really an advantage?
Another advantage is improved braking behaviour when full braking is required and a complete release of the rear-differential lock enables optimal actuation of the individual wheels during ABS braking, resulting in stable and efficient braking with maximum deceleration.
I don't doubt your statement, so is Porsche touting an "advantage" that isn't really an advantage?
A gear type diff is open when it's decelerating or not under power. This is good for turn-in, especially into tight corners, which is why it's favored in autocross. Being open in decel, however, is considered a disadvantage for big track work, where a plate type locking diff adds stability during higher speed turn-in.
Having the diff electronically actuated will allow Porsche to tune when it's active or not, perhaps unlocking it at lower speeds when maneuverability is required and locking it at higher speed when you need stability. Or perhaps they have tuned the ABS or RWS to add some of that stability. I'm not sure, but having it electronically actuated gives them a bunch of new options to tune the handling, and I suspect they are taking advantage of them.
#15
Oh no- not PDK again. Another reason no MT. Integrated systems communicating. Funny I just put electronic system on my bike. I love down tube shifters of the olden days and take out #3 for retro TT and fun rides. but like PDK electronic shifting is the here and is the future.I am sure some bike ride thinks only a ***** would not rather use old friction shifters. It does however enable one to find different ways to extract speed and enjoyment. Hopefully the PDK will provide the same.