Add limited slip to base 991.2?
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Bulldawgfan1000 (12-20-2021)
11-03-2018, 10:21 PM
#18
Rennlist Member
It's funny, I was just thinking about how narrow a rear tire one might be able to run on a 991 for snow use, and how much it might help. 305s, or even 295s, are awfully wide for a winter tire. Front tires and wheels on the back of a 991 might look funny, but a set of 245 snow tires all around might make a 991 quite a winter car, LSD or no.
11-03-2018, 10:31 PM
#19
Drifting
No, and pretty unlikely—though I did get stuck in a freak June snowstorm on the way up to Tahoe in my GT4...on track-worn Pilot Sport Cup 2s.
It's funny, I was just thinking about how narrow a rear tire one might be able to run on a 991 for snow use, and how much it might help. 305s, or even 295s, are awfully wide for a winter tire. Front tires and wheels on the back of a 991 might look funny, but a set of 245 snow tires all around might make a 991 quite a winter car, LSD or no.
It's funny, I was just thinking about how narrow a rear tire one might be able to run on a 991 for snow use, and how much it might help. 305s, or even 295s, are awfully wide for a winter tire. Front tires and wheels on the back of a 991 might look funny, but a set of 245 snow tires all around might make a 991 quite a winter car, LSD or no.
God bless,
TT
11-03-2018, 11:05 PM
#21
Drifting
If I'm understanding this calculator https://www.1010tires.com/Tools/Whee...et-Calculator# correctly, it appears the front 20" Porsche winter tire and wheel set (245 winter tires on 8.5x20 ET 49 wheels) would fit on the rear of our base 911s and adding a 3mm spacer would bring them out to where the OEM winter rear wheels (11x20 ET 78) would be. If I'm using it correctly. Probably for another thread, wondering how folks find the OEM 295 rear winter tires in the snow?
God bless,
TT
God bless,
TT
11-04-2018, 12:28 AM
#22
Rennlist Member
Bet the GT4 was a handful! The Porsche winter tire and wheel set for our 911s includes 295s at the rear. On the other hand, the BMW winter tire and wheel set for my 2016 F10 M5 (one of the last M5s one could order with a stick) includes 255s all around and they seem to work fine. Based on that, I'm guessing your guess is correct that winter 245s all around for our 911s would be about right. Not sure how to make that happen, especially regarding rear wheels. Didn't you drive a 991.2 911 T and a 991.2 GT3 Touring in France in winter conditions?
If I'm understanding this calculator https://www.1010tires.com/Tools/Whee...et-Calculator# correctly, it appears the front 20" Porsche winter tire and wheel set (245 winter tires on 8.5x20 ET 49 wheels) would fit on the rear of our base 911s and adding a 3mm spacer would bring them out to where the OEM winter rear wheels (11x20 ET 78) would be. If I'm using it correctly. Probably for another thread, wondering how folks find the OEM 295 rear winter tires in the snow?
11-04-2018, 12:42 AM
#23
Drifting
Good memory, and yes I did. Trying to remember if I have this right way around, but the Pirelli snows on the T were notably superior to the Michelin snows on the GT3 Touring—which was most evident under hard braking on the Col de Turini. What was I thinking...?
Oh, it was a thrill. You should have seen the CHP swivel his head as I coasted by at 45 mph in a red GT4, while he tended to a brand-new Chevy truck totaled into some rocks in the median...with its $45 1975 Chevy pickup bed trailer still in mint condition....
Ooh, good point. I forgot about that—the 991.2 has a rear offset that really isn't very far off of a front offset. A 5mm spacer might be just the thing...but would have to look at that. I suspect that 245s all around would not be approved by Porsche, but it would be interesting to experiment with both PAG's approved winter setup and then 245s all around.
Oh, it was a thrill. You should have seen the CHP swivel his head as I coasted by at 45 mph in a red GT4, while he tended to a brand-new Chevy truck totaled into some rocks in the median...with its $45 1975 Chevy pickup bed trailer still in mint condition....
Ooh, good point. I forgot about that—the 991.2 has a rear offset that really isn't very far off of a front offset. A 5mm spacer might be just the thing...but would have to look at that. I suspect that 245s all around would not be approved by Porsche, but it would be interesting to experiment with both PAG's approved winter setup and then 245s all around.
You gave that CHP a good story to tell!
I purchased the Porsche winter setup a few weeks ago--and I don't even have my 911 yet!--and just now started an RL thread to get feedback from winter 295 rear tire users. I'm now sorely tempted to buy another set of the Porsche front winter tires/wheels just to try them on the rear, except for three things: 1) they aren't cheap, 2) we don't get big dumps of snow in southern Indiana that often and 3) I'm probably too lazy to change the rears back and forth if we do get a big dump. But it is tempting for sure!
God bless,
TT
11-04-2018, 01:14 AM
#24
Rennlist Member
No snow outright on my press wave (they had real snow on the roads a day or two earlier, which is why the cars were on snow tires). We did have a little snow to either side of the road and the odd bit of wet road and ice here and there. Kept all of us on our toes for sure because the pace was anything but casual...but I was pretty impressed with both tires even when things got really cold and truly wet. There were some spots where there just wasn't a lot of grip...and I was thoroughly spent when I got to the hotel that night...far more so than after a track day, most loop days, and even some races. But boy was I smiling then, and this evening as I think back about it. Thanks for jogging that memory!
11-04-2018, 03:33 PM
#25
Drifting
No snow outright on my press wave (they had real snow on the roads a day or two earlier, which is why the cars were on snow tires). We did have a little snow to either side of the road and the odd bit of wet road and ice here and there. Kept all of us on our toes for sure because the pace was anything but casual...but I was pretty impressed with both tires even when things got really cold and truly wet. There were some spots where there just wasn't a lot of grip...and I was thoroughly spent when I got to the hotel that night...far more so than after a track day, most loop days, and even some races. But boy was I smiling then, and this evening as I think back about it. Thanks for jogging that memory!
By the way, a gentleman from Evergreen, Colorado responded to my 295/305 winter rear tire thread that the 295s work fine in snow. He says the real problem is the lack of ground/snow clearance.
God bless,
TT
Last edited by TomTarzian; 11-04-2018 at 09:20 PM.
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stout (04-24-2020)
11-04-2018, 05:57 PM
#26
Rennlist Member
I have had a Os Giken installed by a specialist in one of my previous cars. I also had the final gear ratio changed.
i took out the diff myself and shipped it and then put it back, twice actually. Once for the FGR and then for LSD
you need a specialist to do the job correctly so find someone who knows what they are doing first.
i took out the diff myself and shipped it and then put it back, twice actually. Once for the FGR and then for LSD
you need a specialist to do the job correctly so find someone who knows what they are doing first.
04-24-2020, 12:52 AM
#27
Instructor
I'm wondering if a tune on a base without LSD is a bad idea because of greater likelihood of power oversteer.
I've made some amazing upgrades to my base MT 991.2 - DSC controller, Tractive shocks with much stiffer springs, lower ride height. It's considerably harder for me to spin the inner wheel coming out of a turn, especially after DSC, but it can happen, especially in the rain.
There are times when I go off and on the throttle and can tell the turbos were still spinning and I get such a wonderful jolt of acceleration. This is what it must be like with a tune, I imagine, so I've been thinking about getting APR with its more NA-looking power curve. Is this going to be more painful than fun with such a loose rear? I think it'll teach me to be a better driver, but also seems unsafe.
Can people with an open diff chime in on how a tune has affected their power oversteer?
I've made some amazing upgrades to my base MT 991.2 - DSC controller, Tractive shocks with much stiffer springs, lower ride height. It's considerably harder for me to spin the inner wheel coming out of a turn, especially after DSC, but it can happen, especially in the rain.
There are times when I go off and on the throttle and can tell the turbos were still spinning and I get such a wonderful jolt of acceleration. This is what it must be like with a tune, I imagine, so I've been thinking about getting APR with its more NA-looking power curve. Is this going to be more painful than fun with such a loose rear? I think it'll teach me to be a better driver, but also seems unsafe.
Can people with an open diff chime in on how a tune has affected their power oversteer?
04-24-2020, 01:12 AM
#28
Rennlist Member
I recall reading your account of it, I think in this thread https://rennlist.com/forums/991/1039...touring-2.html The second day, in particular, with the GT3 Touring, sounded fabulous. Thanks so much for sharing your wonderful Porsche adventures with all of us!
By the way, a gentleman from Evergreen, Colorado responded to my 295/305 winter rear tire thread that the 295s work fine in snow. He says the real problem is the lack of ground/snow clearance.
God bless,
TT
By the way, a gentleman from Evergreen, Colorado responded to my 295/305 winter rear tire thread that the 295s work fine in snow. He says the real problem is the lack of ground/snow clearance.
God bless,
TT
04-24-2020, 03:44 PM
#29
Advanced
I'm wondering if a tune on a base without LSD is a bad idea because of greater likelihood of power oversteer.
I've made some amazing upgrades to my base MT 991.2 - DSC controller, Tractive shocks with much stiffer springs, lower ride height. It's considerably harder for me to spin the inner wheel coming out of a turn, especially after DSC, but it can happen, especially in the rain.
There are times when I go off and on the throttle and can tell the turbos were still spinning and I get such a wonderful jolt of acceleration. This is what it must be like with a tune, I imagine, so I've been thinking about getting APR with its more NA-looking power curve. Is this going to be more painful than fun with such a loose rear? I think it'll teach me to be a better driver, but also seems unsafe.
Can people with an open diff chime in on how a tune has affected their power oversteer?
I've made some amazing upgrades to my base MT 991.2 - DSC controller, Tractive shocks with much stiffer springs, lower ride height. It's considerably harder for me to spin the inner wheel coming out of a turn, especially after DSC, but it can happen, especially in the rain.
There are times when I go off and on the throttle and can tell the turbos were still spinning and I get such a wonderful jolt of acceleration. This is what it must be like with a tune, I imagine, so I've been thinking about getting APR with its more NA-looking power curve. Is this going to be more painful than fun with such a loose rear? I think it'll teach me to be a better driver, but also seems unsafe.
Can people with an open diff chime in on how a tune has affected their power oversteer?
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tosha (04-24-2020)
04-24-2020, 09:27 PM
#30
Instructor
I'm tempted to get Guard LSD + APR tune. I do like the fact that I've been learning how throttle can destabilize a car, and how entry speed is so important. I miss the sensation of a torquey acceleration out of a turn after a good heel and toe that I felt in my 996 4S. Perhaps the LSD can allow me to experience that again. I still can't believe how commuters like Nick Murray get away with blathering on about what an amazing car the base is. It is not a driver's car. I love how mine is optioned, and it's beautiful, and although I peep at autotempest and dream about a GT3 touring, it seems like the most prudent thing to do is make these upgrades for the time being.