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Randy Pobst Drives C8 at VIR

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  • #46
    Originally posted by Gadgety View Post

    Yes, the C8 on street settings has more power oversteer at 80 mph than it does at 40. To me it's not a good sign, as it makes the car less predictable, and will take experience getting used to.

    In the video Pobst says track camber adjustments "...reduced understeer, and guess what, it reduced oversteer as well. Grip was up on both ends of the car, and the balance was better. The gorilla in the room is why do you need to decrease the camber to reduce this understeer. We drive a lot of cars that are well balanced and handle beautifully without radical amounts of camber."

    Those settings seem preferable to me, but will not be viable on the street due to tire wear.
    The negative camber in track mode was slightly more extreme in the front than the rear, so it makes sense that it didn’t alter the understeer-to-oversteer ratio that much. I suspect that adding 1 degree negative camber to the only front would remedy the understeer issue while also maintaining an acceptable tread wear pattern. Stock, the C8 only -0.5deg of camber front and rear which is minimal. My M3 has more negative camber from the factory I believe.

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    • #47
      I read it wrong.

      It was 2:01.91 track setting. The Viper ARC , for comparison , did 1:57.?



      if the below make sense to anyone for comparison, then good. The GT3 record is 1:59.045 by Tony Ave on Oct 11, 2019. The C8 is , maybe, a fast ride.
      OFFICIAL SCCA COURSE RECORDS AS OF 10/13/2019
      COURSE : VIRginia International Raceway-FULL COURSE post 2013
      TRACK LENGTH: 3.27 Miles
      CLASS DRIVER NAME LAP TIME SPEED DATE
      AS James Jost 02:03.900 95.012 10/11/2019
      ASR Jacek Mucha 01:47.580 109.426 05/08/2016
      BSpec David Daughtery 02:22.094 82.847 10/13/2019
      CF Steve Brooks 02:06.128 93.334 05/10/2014
      EP F5 FA FC Jesse Prather 02:01.631 96.785 10/11/2019 10/11/2019 10/12/2019 10/12/2019
      Wiley McMahan 01:58.000 99.763
      Dario Cangialosi 01:43.107 114.173
      Robert Allaer 01:52.174 104.944
      FE Scott Rettich 01:52.874 104.293 04/19/2014
      FE2 Liam Snyder 01:52.154 104.963 10/11/2019
      FF Andy Brumbaugh 02:01.058 97.243 04/15/2017
      FP Eric Prill 02:08.076 91.914 10/13/2019
      FS Jacek Mucha 01:49.798 107.215 05/13/2018
      FV Andrew Whitston 02:15.065 87.158 04/15/2018
      FX
      GT1 Tony Ave 01:45.302 111.793 04/15/2017
      GT2 GT3 Andrew Aquilante 01:52.475 104.663 10/12/2019 10/11/2019
      Tony Ave 01:59.045 98.887
      GTA Al Rowland 01:55.707 101.740 05/12/2018
      GTL Bill Ball 02:07.837 92.086 10/12/2019
      GTP Bruce Shelton 02:20.901 83.548 05/11/2014
      GTX
      HP Ron Bartell 02:15.062 87.160 10/12/2019
      IT7 Neil Gueldner 02:20.740 83.644 05/11/2014
      IT7R Rose/Perez/Stitt 02:14.635 87.436 10/18/2015
      ITA Ted Thorp 02:16.279 86.382 10/17/2016
      ITB Thomas Martin 02:23.251 82.177 05/07/2016
      ITC Fine/Steagall 02:32.844 77.020 05/07/2016
      ITE Raver/Skeen/Durbin 01:52.413 104.721 10/24/2015
      ITO Mike Schlickenmeyer 02:09.434 90.950 05/11/2014
      ITR Troxell/Troxell/Rothstein 02:12.665 88.735 10/24/2014
      ITS Jeff Giordano 02:12.469 88.866 05/13/2018
      LC Carter Weedon 02:15.442 86.915 10/15/2017
      P1 P2 Todd Slusher 01:43.498 113.741 10/11/2019 10/13/2019
      Greg Gyann 01:50.258 106.768
      PX
      SM Dillon Machavern 02:14.429 87.570 04/19/2014
      SM5 Greg Obadia 02:11.884 89.260 05/10/2014
      SMSE Fischer 02:17.930 85.348 10/16/2016
      SMX Manny Martinez 02:12.451 88.878 03/10/2018
      SPO Jeremy (Adam) Romito 01:49.689 107.322 10/15/2017
      SPU Bryan Yates 02:08.802 91.396 05/06/2017
      SR Jason Cocke 02:23.041 82.298 03/08/2015
      SRF Denny Stripling 02:11.355 89.620 04/16/2017
      SRF3 Bobby Sak 02:04.755 94.361 10/11/2019
      SRX7 Dave Ade 02:22.600 82.553 05/10/2014
      SSM Richard Hromin 02:19.507 84.383 05/07/2017
      STL STU Cliff Ira 02:07.273 92.494 10/11/2019 10/12/2019
      Kevin Boehm 02:00.483 97.707
      T1 Tim Myers 01:57.399 100.273 04/15/2018
      T2 T3 T4
      Last edited by SheepDog; 12-05-2019, 02:25 PM.

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      • #48
        Originally posted by Celesion View Post

        The negative camber in track mode was slightly more extreme in the front than the rear, so it makes sense that it didn’t alter the understeer-to-oversteer ratio that much. I suspect that adding 1 degree negative camber to the only front would remedy the understeer issue while also maintaining an acceptable tread wear pattern. Stock, the C8 only -0.5deg of camber front and rear which is minimal. My M3 has more negative camber from the factory I believe.
        Seems plausible. Equal negative camber front and rear on street settings (-0.5), while track settings were 0.5 higher at the rear than the front (-3.0 f; -2.5 r). The good thing is, the settings are adjustable.

        Comment


        • #49
          Randy thinks it's the e-lsd too. I really hope this can be updated on the fly with options in software. % lockup as a menu item in "Z mode" would be heaven.

          https://www.midenginecorvetteforum.c...g-improvements

          Comment

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