Crown

Forum - Thread


    Re: Track photos , Paul Ricard october 2018

    Gnil:
    Ferdie:
    . Hence, tire pressure and to a higher degree a lack of camber at the front axle seems to be the reason. At least that's how it looks to me.

    That's also what we concluded . 

     

    Have these cars had a proper alignment prior to track driving? At least on the Carrera T I assume that the suspension geometry is rather aimed towards versatility than track usage. 

    That doesn't mean that these specific tires are more prone to delimitation but more camber would definitely spread the load more evenly onto the entire tread surface.

     

     

    The car was on standard geometry ....... but still . Lots of people drive their cars with standard geometry on the track and they don't get the tire to delaminate .  I drove many many tracks with my 997 Carrera S with non N rated PSS and standard alignment and never , ever, did the tire end up loosing bits of it .

    On Michelin ' s defense , the tire were probably under inflated as it was the first session of the day  and the guys sticked to Cup pressure recommendations . But still ...... should ne end up like this .

     

    To be fair, the exactly same setup driven by 2 different person will have different wear. Porsche provide us with identical setups for our race cars, 3 of us wear out the rear first, we loses rear hip way before he front. The 4th guy wears out the front first. 

    excessive front tire corner wear basically means the car is plowing. Under steering and leaning on the shoulders way too much. In a 911 that means someone is not properly trail brake the car to help it rotate. Those shoulders basically turned into an extra set of brake pads to scrub off speed.

     


    --

     

     


    Re: Track photos , Paul Ricard october 2018

    Whoopsy:
    To be fair, the exactly same setup driven by 2 different person will have different wear. Porsche provide us with identical setups for our race cars, 3 of us wear out the rear first, we loses rear hip way before he front. The 4th guy wears out the front first. 

    excessive front tire corner wear basically means the car is plowing. Under steering and leaning on the shoulders way too much. In a 911 that means someone is not properly trail brake the car to help it rotate. Those shoulders basically turned into an extra set of brake pads to scrub off speed.

     

    The driver is a Swiss Sports Cup racer in his 7th season . He rarely drives anything else then a Cup car on tracks . 

    In this session he was chasing GT3's on Michelin Cup tire  with his GT4 on PS4 tire , that were probably not enough inflated + the car is on standard chassis setting .  He drove it probably like he drives his Cup . All this put together lead to the delimitation . Still, this tire should not delaminate like this . 


    --

     964 Carrera 4 --  997.2 C2S , -20mm -- 991.2 GT3 RS 


    Re: Track photos , Paul Ricard october 2018

    Gnil:
    Whoopsy:
    To be fair, the exactly same setup driven by 2 different person will have different wear. Porsche provide us with identical setups for our race cars, 3 of us wear out the rear first, we loses rear hip way before he front. The 4th guy wears out the front first. 

    excessive front tire corner wear basically means the car is plowing. Under steering and leaning on the shoulders way too much. In a 911 that means someone is not properly trail brake the car to help it rotate. Those shoulders basically turned into an extra set of brake pads to scrub off speed.

     

    The driver is a Swiss Sports Cup racer in his 7th season . He rarely drives anything else then a Cup car on tracks . 

    In this session he was chasing GT3's on Michelin Cup tire  with his GT4 on PS4 tire , that were probably not enough inflated + the car is on standard chassis setting .  He drove it probably like he drives his Cup . All this put together lead to the delimitation . Still, this tire should not delaminate like this . 

     

    So he knows how to drive. 

    GT4 doesn't need as much trail braking if at all to rotate compare with a 911. The tire is probably and in all likelihood under inflated. Rolling over the shoulders too much. And with the stock settings under steering too much also, all added to scrubbing the shoulders way too much.

     

     


    --

     

     


     
    Edit

    Forum

    Board Subject Last post Rating Views Replies
    Porsche Sticky SUN'S LAST RUN TO WILSON, WY - 991 C2S CAB LIFE, END OF AN ERA (Part II) 12/8/23 11:25 PM
    GnilM
    302513 1704
    Porsche Sticky Welcome to Rennteam: Cars and Coffee... (photos) 11/18/23 11:46 AM
    Boxster Coupe GTS
    267986 551
    Porsche Sticky OFFICIAL: Cayman GT4 RS (2021) 5/12/23 12:11 PM
    W8MM
    194543 288
    Porsche Sticky OFFICIAL: Porsche 911 (992) GT3 RS - 2022 12/6/23 11:50 AM
    Porker
    118449 256
    Porsche The moment I've been waiting for... 11/29/23 8:30 PM
    Pilot
     
     
     
     
     
    754427 1361
    Porsche 992 GT3 7/23/23 7:01 PM
    Grant
    560878 3868
    Porsche OFFICIAL: 911 R (2016) 12/25/22 1:02 AM
    CGX car nut
    554060 2663
    Porsche OFFICIAL: New Porsche 911 Turbo S (2020) 4/6/23 7:43 AM
    crayphile
    383323 1276
    Porsche Welcome to the new Taycan Forum! 11/3/23 1:06 PM
    Wonderbar
    299178 1495
    Porsche Donor vehicle for Singer Vehicle Design 7/3/23 12:30 PM
    Porker
    291868 797
    Others Tesla 2 the new thread 12/11/23 11:50 AM
    Pilot
    240334 2394
    Porsche GT4RS 12/1/23 8:15 AM
    GnilM
    227962 1361
    Lambo Aventador and SV 3/30/23 1:59 PM
    CGX car nut
    227007 724
    Ferrari Ferrari 812 Superfast 4/21/23 8:09 AM
    the-missile
    182785 550
    Porsche Red Nipples 991.2 GT3 Touring on tour 12/6/23 10:31 PM
    Enmanuel
    172884 620
    Others Corvette C8 10/16/23 3:24 PM
    Enmanuel
    163053 488
    Motor Sp. [2022] Formula 1 2/4/23 1:10 AM
    WhoopsyM
    158597 1576
    Porsche Collected my 997 GTS today 10/19/23 7:06 PM
    CGX car nut
     
     
     
     
     
    153133 812
    Lambo Huracán EVO STO 7/30/23 6:59 PM
    mcdelaug
    129011 346
    Others Gordon Murray - T.50 11/22/23 10:27 AM
    mcdelaug
    54221 387
    Others Valkyrie final design? 4/28/23 2:45 AM
    Rossi
    43583 219
    AMG Bought a muscle car... 3/26/23 3:31 PM
    WhoopsyM
    34919 303
    Porsche 992 Sport Classic 2/13/23 5:35 PM
    RCA
    29065 213
    Lotus Lotus Emira 6/25/23 2:53 PM
    Enmanuel
    27481 101
    Porsche Back to basics - 996 GT3 RS 6/11/23 5:13 PM
    CGX car nut
    26586 144
    Motor Sp. 2023 Formula One 12/6/23 7:22 PM
    964C2
    26433 684
    Ferrari [2022] Ferrari Purosangue (SUV) 4/15/23 5:20 AM
    watt
    24762 141
    AMG Mercedes-Benz W124 500E aka Porsche typ 2758 11/21/23 2:47 PM
    the-missile
    23291 272
    Porsche 2022 992 Safari Model 12/9/23 11:35 PM
    CGX car nut
    20057 185
    BMW M 2024 BMW M3 CS Official Now 8/30/23 6:51 PM
    art.italy
    15755 297
    139 items found, displaying 1 to 30.