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Corvette Today Interviews Harlan Charles Re The C8 & More: ON NOW

What a wonderful Corvette Today podcast!!! Steve Garrett sits down with Corvette Product Manager, Harlan Charles on this episode of CORVETTE TODAY.  https://anchor.fm/steve-garrett/epis...enea/a-a2qtt60. Harlan talks about his early years with Chevrolet and how he became Product Manager for Corvette. He also discusses the cohesive work done by the entire Corvette team-from C5 through C8.  You'll learn about the evolution of the new mid-engine C8 Corvette and the steps taken to bring it to market. Plus, Harlan delves into the launch of the C8, the development of the strategy behind the mid-engine car.
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Randy Pobst Drives C8 at VIR

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  • TraxsterII
    replied
    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

    Leave a comment:


  • Gadgety
    replied
    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.

    Leave a comment:


  • SheepDog
    replied
    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, 01:25 PM.

    Leave a comment:


  • Celesion
    replied
    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.

    Leave a comment:


  • Gadgety
    replied
    Originally posted by SheepDog View Post
    The article focused exclusively on the narrow issue.

    The article does not talk about the lap times. Must be saving that for later article and later release.

    The track-setting car was 2 0r 3 seconds faster ? Than what ? is what?

    The street-setting car was 2 seconds slower than the McLaren 600 and 3 seconds slower that the fastest car at Thunder Hill West, with the terrible oversteer. What does 2 or 3 seconds mean in comparison with other cars?

    Tell us Randy.
    There was a follow up article stating the time difference between the two settings was 1.77 seconds. https://www.motortrend.com/cars/chev...nt-understeer/

    Leave a comment:


  • Gadgety
    replied
    Originally posted by TraxsterII View Post
    Nice positive review, no glaring handling defects , just minor tuning. However my surprise, as well as Randy's (he uses the word "interesting"), was un-noteworthy low speed power oversteer, yet high speed power oversteer was (80-100mph power oversteer, yet very tractable 40-60 mph). That's very surprising/interesting to me as well since that's usually the opposite, and that characteristic didn't go away between street/track alignments. I drive on track with all nannies off too. Nannies will be ON while I learn the C8, until I get more comfortable with the car. This is going to be a lot of fun!!
    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.
    Last edited by Gadgety; 12-05-2019, 06:12 AM.

    Leave a comment:


  • Gadgety
    replied
    Originally posted by WillRockwell View Post
    Does the camber swing out when you dial in track mode?
    No, you have to hoist the car up and change the settings on each wheel individually. At least it can be done.

    Leave a comment:


  • JB
    replied
    I believe the track setting alignment was 2 or 3 seconds than the street settings alignment.

    how the c8 compares to other cars I believe was just the very quick c7 z51.

    Leave a comment:


  • dcbingaman
    replied
    Yeah, I think the increase in oversteer with speed is aero. The Z51 splitter provides more CL (force coefficient) than the Z51 mini-wing spoiler. As speed goes up the nose gets more loaded than the tail. I wonder if the high wing is the fix for this - I've wondered why it is offered at all. I'm starting to think its not just cosmetics, sports fans.

    The C8.R also has a much bigger wing than the Z51, but the splitter looks similar (looks can be deceiving).

    Leave a comment:


  • SheepDog
    replied
    The article focused exclusively on the narrow issue.

    The article does not talk about the lap times. Must be saving that for later article and later release.

    The track-setting car was 2 0r 3 seconds faster ? Than what ? is what?

    The street-setting car was 2 seconds slower than the McLaren 600 and 3 seconds slower that the fastest car at Thunder Hill West, with the terrible oversteer. What does 2 or 3 seconds mean in comparison with other cars?

    Tell us Randy.
    Last edited by SheepDog; 12-04-2019, 10:29 PM.

    Leave a comment:


  • TraxsterII
    replied
    Originally posted by dcbingaman View Post

    I noticed that too. Could it be the aero. ?? I wonder if a better wing would make the car less prone to yaw at speed. In any case it didn't sound too hard to correct - just a bit more throttle in this thing tends to straighten it out....kinda like a 911.

    Good question. IIRC C8Z51 aero creates net downforce, not just reduced lift. I'd imagine relative balance F/R would have to change to account for this inverse power oversteer. The proposition becomes IOW, the C8 gains more front downforce vs rear as speeds climb to +80mph. I'm puzzled at how that can be accomplished without canards or front wing, and merely a splitter. I'm guessing there is not much more than 2-300# total downforce 80-100mph, not enough to make a stark transition of the car's balance. IDK. This is very strange or "unusual" as RP put it. I'm thinkin it's the e-lsd.


    RP writes, "I found a consistent gradual side-slip in third and fourth gears, exiting faster sweepers. The C8 has more power oversteer at 80 mph than it does at 40. Unusual."
    Last edited by TraxsterII; 12-04-2019, 07:44 PM.

    Leave a comment:


  • LSECO
    replied
    In one of my cars, I can't launch properly with TC on, and in the truck I can't motocross at all with it on. I always leave it on for travels in inclement weather in all cars. It really helps with braking on uneven surfaces.

    Leave a comment:


  • Celesion
    replied
    Originally posted by jackfrostpdx View Post

    These modern supercars' natural form is nannies on. I'd sooner turn off ABS than Stabilitrak especially in slick/cool weather.
    Hmmm... I disagree. If it’s dry and warm outside, and the driver understands some basic performance driving principles, traction control is entirely unnecessary. ABS on the other hand, is almost always helpful. I literally never drive with traction control on when the weather is good.

    Leave a comment:


  • TAdams65
    replied
    Craziest thing I ever saw was on I-55 headed to Chicago one afternoon headed to work. A C6 came off an ramp to merge onto I-55. He nailed it, car fish tailed, he went into the ditch at full speed, *** end trying to come around the front, bounced out of the ditch back into traffic on I-55 into the center lane and did not hit anyone, or cause any of us to hit anyone else. It was unbelievable. He did get off at the next exit.

    Leave a comment:


  • jackfrostpdx
    replied
    Originally posted by meyerweb View Post

    Understood. At the same time, I've seen far too many videos of Corvettes, especially Z06s, spinning off into trees, telephone polls, parked cars, etc., because the driver thought he had better reflexes than the computer. The nannies on my C7 aren't noticeable 99% (internet statistic ) of the time, but when the road is unexpectedly slippery they've kept me pointed straight a few times. I've never had Stabilitrak cut throttle when there's adequate traction for the throttle I'm asking for.
    These modern supercars' natural form is nannies on. I'd sooner turn off ABS than Stabilitrak especially in slick/cool weather.

    Leave a comment:

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