Mechanical vs. E Diff
11-25-2018, 12:07 PM
#16
Rennlist Member
Given porsche significantly upgraded the 6MT components compared to previous iterations, I would think the LSD would have gotten some similar treatment. They knew the 997's were weak in that area. However, unlike E-diffs, the problem with mechanical LSD's is that for street cars you can't really be overly aggressive with the locking, or else it becomes difficult in normal daily conditions, like rain, etc. etc. If you had a 997 with a Guard, even a milder 40/60, when you drove it on the street in rain, it was a scary proposition. Borderline unsafe. So for road cars, they have to find a balance, because the e-diff can provide more or less locking depending on application. The mechanical has a fixed amount based on the initial design and ramps.
For now, I find the mechanical LSD to be fantastic on track, I don't really feel the need for more lock or aggressiveness. If the internals are essentially the same as the e-diff, then hopefully we can get some good life out of them. I'm sure Guard will let us know at some point either way.
For now, I find the mechanical LSD to be fantastic on track, I don't really feel the need for more lock or aggressiveness. If the internals are essentially the same as the e-diff, then hopefully we can get some good life out of them. I'm sure Guard will let us know at some point either way.
11-25-2018, 01:01 PM
#17
Nordschleife Master
Originally Posted by Mvez
Given porsche significantly upgraded the 6MT components compared to previous iterations, I would think the LSD would have gotten some similar treatment. They knew the 997's were weak in that area. However, unlike E-diffs, the problem with mechanical LSD's is that for street cars you can't really be overly aggressive with the locking, or else it becomes difficult in normal daily conditions, like rain, etc. etc. If you had a 997 with a Guard, even a milder 40/60, when you drove it on the street in rain, it was a scary proposition. Borderline unsafe. So for road cars, they have to find a balance, because the e-diff can provide more or less locking depending on application. The mechanical has a fixed amount based on the initial design and ramps.
For now, I find the mechanical LSD to be fantastic on track, I don't really feel the need for more lock or aggressiveness. If the internals are essentially the same as the e-diff, then hopefully we can get some good life out of them. I'm sure Guard will let us know at some point either way.
For now, I find the mechanical LSD to be fantastic on track, I don't really feel the need for more lock or aggressiveness. If the internals are essentially the same as the e-diff, then hopefully we can get some good life out of them. I'm sure Guard will let us know at some point either way.
It is fine on the street, and rain
11-26-2018, 04:55 PM
#18
Rennlist Member
Although I didn't have one, after driving and riding in a couple 997's with Cup LSD's, I think I actually preferred it to the Guard, which seemed to lock more aggressively than the Cup setup did. Cup unit just felt smoother. I can totally see how that setup may be better for street driving.
11-26-2018, 07:01 PM
#19
Rennlist Member
That said, I did send a request to Holinger and Guard to see if they have any plans for an LSD upgrade for the 991.2 GT3 6MT.
Guard said they currently have no plans to offer anything for the 991.2 GT3, however Matt did note that if the gearbox is still a G97 (which is possible), then they would already have something for it. He just hasn't been able to confirm the gearbox yet. We need to confirm if the gearbox is still a G97 carryover from the 997, which certainly possible.
Holinger are the only people I know that offer an LSD upgrade for the 991 Cup gearboxes, and they also offer GT4 gear sets and LSD's, along with G97 LSD's for the 997 GT3's. I am not 100% sure, but I believe the 6MT in the .2 GT3 is just an evolution of the G97, so I assume making an LSD for it would be pretty straightforward. Given they already offer a 20-plate clutch (kinda reminds me of a Giken) for the 997 GT3, I would think it would be pretty easy to offer an upgrade for the 991.2 GT3.
I'll keep everyone posted if there are any product development plans from Holinger. If anybody will do it, it would be these guys. Here's a quick flyer on their G96/97 and 991 LSD's.
http://holingeramerica.com/media/570...rentials_w.pdf
Guard said they currently have no plans to offer anything for the 991.2 GT3, however Matt did note that if the gearbox is still a G97 (which is possible), then they would already have something for it. He just hasn't been able to confirm the gearbox yet. We need to confirm if the gearbox is still a G97 carryover from the 997, which certainly possible.
Holinger are the only people I know that offer an LSD upgrade for the 991 Cup gearboxes, and they also offer GT4 gear sets and LSD's, along with G97 LSD's for the 997 GT3's. I am not 100% sure, but I believe the 6MT in the .2 GT3 is just an evolution of the G97, so I assume making an LSD for it would be pretty straightforward. Given they already offer a 20-plate clutch (kinda reminds me of a Giken) for the 997 GT3, I would think it would be pretty easy to offer an upgrade for the 991.2 GT3.
I'll keep everyone posted if there are any product development plans from Holinger. If anybody will do it, it would be these guys. Here's a quick flyer on their G96/97 and 991 LSD's.
http://holingeramerica.com/media/570...rentials_w.pdf
Last edited by Mvez; 11-27-2018 at 10:30 AM.
11-27-2018, 08:31 PM
#20
Rennlist Member
Update:
Holinger has confirmed that the .2 GT3 has an all new gearbox, with no carryover from the previous G96/97, so it should have a new LSD as well. They said they are currently working on diffs for the 7spd cars, and then will focus engineering toward the 6spd boxes. I told them that their efforts would likely be rewarded much faster and in better volume if they went after the 6spd. The average 6MT GT3 owner is more likely to be a hardcore track guy than somebody with a base Carerra 7spd looking for an LSD, especially since the majority of GT3 owners went for the 6MT.
The good news is that it's on their radar.
Holinger has confirmed that the .2 GT3 has an all new gearbox, with no carryover from the previous G96/97, so it should have a new LSD as well. They said they are currently working on diffs for the 7spd cars, and then will focus engineering toward the 6spd boxes. I told them that their efforts would likely be rewarded much faster and in better volume if they went after the 6spd. The average 6MT GT3 owner is more likely to be a hardcore track guy than somebody with a base Carerra 7spd looking for an LSD, especially since the majority of GT3 owners went for the 6MT.
The good news is that it's on their radar.
11-27-2018, 08:37 PM
#21
Addict
Rennlist Member
Rennlist Member
Thanks for update. I’m hoping an upgrade is unnecessary, but good to have options...
11-27-2018, 08:38 PM
#22
Drifting
Update:
Holinger has confirmed that the .2 GT3 has an all new gearbox, with no carryover from the previous G96/97, so it should have a new LSD as well. They said they are currently working on diffs for the 7spd cars, and then will focus engineering toward the 6spd boxes. I told them that their efforts would likely be rewarded much faster and in better volume if they went after the 6spd. The average 6MT GT3 owner is more likely to be a hardcore track guy than somebody with a base Carerra 7spd looking for an LSD, especially since the majority of GT3 owners went for the 6MT.
The good news is that it's on their radar.
Holinger has confirmed that the .2 GT3 has an all new gearbox, with no carryover from the previous G96/97, so it should have a new LSD as well. They said they are currently working on diffs for the 7spd cars, and then will focus engineering toward the 6spd boxes. I told them that their efforts would likely be rewarded much faster and in better volume if they went after the 6spd. The average 6MT GT3 owner is more likely to be a hardcore track guy than somebody with a base Carerra 7spd looking for an LSD, especially since the majority of GT3 owners went for the 6MT.
The good news is that it's on their radar.
11-28-2018, 12:58 AM
#23
Rennlist Member
E-diff with PTV works better then the motorsports diff we ran in the 997’s but I think as a hardcore track car the RS could have a litte more diff at the limit.
Than again its just not needed to trail brake as much with RWS and PTV that gives huge front grip on the way into the corner.
Less pure, but it works great.
Than again its just not needed to trail brake as much with RWS and PTV that gives huge front grip on the way into the corner.
Less pure, but it works great.
01-31-2021, 11:49 AM
#24
Rennlist Member
New Post in Old thread....
Just a question... is it normal to have a noisy transmission/duff when doing parking maneuvers... I notice more it in the last months.. My manual 991 gt3 has now 28k km.... My porsche technician said it s perfectly fine and normal... Do you think the same?
Just a question... is it normal to have a noisy transmission/duff when doing parking maneuvers... I notice more it in the last months.. My manual 991 gt3 has now 28k km.... My porsche technician said it s perfectly fine and normal... Do you think the same?
01-31-2021, 01:27 PM
#25
Addict
Rennlist Member
Rennlist Member
New Post in Old thread....
Just a question... is it normal to have a noisy transmission/duff when doing parking maneuvers... I notice more it in the last months.. My manual 991 gt3 has now 28k km.... My porsche technician said it s perfectly fine and normal... Do you think the same?
Just a question... is it normal to have a noisy transmission/duff when doing parking maneuvers... I notice more it in the last months.. My manual 991 gt3 has now 28k km.... My porsche technician said it s perfectly fine and normal... Do you think the same?
01-31-2021, 01:57 PM
#26
Rennlist Member
Last edited by cox1974; 01-31-2021 at 04:35 PM.
