GT350R Race Car Build

Discussion in 'Road Racing Forum' started by Black Boss, Dec 2, 2016.

  1. Black Boss

    Black Boss TMO Addict

    Messages:
    1,588
    Likes Received:
    1,032
    Joined:
    Sep 29, 2012
    Location:
    Michigan
    Great Shakedown today. Wet in the morning, so I took it steady, bedded the brakes, and got a feel for the car. It's LOUD, way louder than my Boss 302 with Long tubes and open side pipes -- gonna need ear plugs :)

    Need to move the dead pedal as it's too close to the clutch, and the driving position will take some getting used to, as I had to drop the seat 1.5" and move it inboard to avoid my helmet hitting the side roof bar -- the S550 package with a cage is way tighter than the S197 with a cage. With the lower seat position I lost a few of my normal reference points.

    Used Contis for the first few sessions, and the car was loose, especially the rear. Experienced the same in the 350R on the same tires to a lesser extent, so I softened the rear sway bar, and increased rear wing -- time improved to slightly better than the 350R on the same tires, on a very green (drying) track.

    Switched to Hoos R7's and times got a lot better -- 1+ seconds faster than the R on a Dry, but green track with more much more throttle lifting than in the 350R to avoid max rpm late in 3 segments of the track and one high speed corner, where I probably need more wing.

    Perhaps, not surprisingly, it's a very different car to drive (compared to the 350R) anywhere close to the limit: Throttle response is way more aggressive, the increased torque, lower weight and reduced rotating/unsprung mass are very apparent. Brake performance is slightly better, which is a real shout out to the OEM Brakes, although the AP brakes are WAY lighter, enable the use of 18" wheels, and likely need proper cooling ducts to get even better performance, especially for trail braking.

    I need to download the AIM data and look at back to back performance to the 350R for more detailed insight.

    A VERY encouraging first outing -- Fun!!

    OD23shXFQEuRx08fKs8Gvw.jpg

    fprbd7EYRLCiN5DZrcr8Qg.jpg
     
    Last edited: Oct 21, 2018
    cobrarob, TymeSlayer, racer47 and 8 others like this.
  2. spartan

    spartan TMO Race

    Messages:
    364
    Likes Received:
    585
    Joined:
    Dec 16, 2017
    Location:
    Michigan
    Thanks for the update. Sounds like a great first day.


    Sent from my iPhone using Tapatalk
     
  3. steveespo

    steveespo Lord knows I'm a Voodoo Child Moderator

    Messages:
    3,374
    Likes Received:
    595
    Joined:
    Mar 6, 2011
    Location:
    NY Metro
    Beautiful Nick. Not fair, but beautiful. See you at the Villa.


    Sent from my iPhone using Tapatalk
     
  4. Black Boss

    Black Boss TMO Addict

    Messages:
    1,588
    Likes Received:
    1,032
    Joined:
    Sep 29, 2012
    Location:
    Michigan
    Checked all the suspension torques after first run — all good!

    Also angled the dead pedal to improve clutch access:

    DBD9FFF8-477A-4E7A-94BC-4B935CB064B5.jpeg
     
    VoodooBoss and ArizonaBOSS like this.
  5. BlackFiveOh

    BlackFiveOh TMO Intermediate

    Messages:
    20
    Likes Received:
    5
    Joined:
    Jul 18, 2017
    Location:
    Reston, Va
    Specifically which suspension torques are you checking/are the most important?


    Sent from my iPhone using Tapatalk
     
  6. ArizonaBOSS

    ArizonaBOSS Because racecar. Moderator

    Messages:
    7,932
    Likes Received:
    1,388
    Joined:
    Dec 6, 2010
    Location:
    Arizona, USA
    Give us some video :)
     
  7. TymeSlayer

    TymeSlayer Tramps like us, Baby we were born to run...

    Messages:
    1,883
    Likes Received:
    722
    Joined:
    Dec 12, 2011
    Location:
    Brighton, Colorado
    Boy do those other three pedals look familiar. When was the last tyme there was a change?

    Can't wait to see it on film at eleven!
     
  8. Black Boss

    Black Boss TMO Addict

    Messages:
    1,588
    Likes Received:
    1,032
    Joined:
    Sep 29, 2012
    Location:
    Michigan
    I paint marked everything during the build. Checked all the Suspension Paint Marks and (sample) torque checked Front Struts, Rear Camber and Toe Links as I figured they are the most likely to move (I swapped out the splined blots in the front strut, which wouldn't move, to plain bolts to get more camber).
    JygEuNP1SBi08patzHyIPw.jpg
    ex4hyiGtSTOlMPHhBRlIwA.jpg
     
    BlackFiveOh and ArizonaBOSS like this.
  9. Black Boss

    Black Boss TMO Addict

    Messages:
    1,588
    Likes Received:
    1,032
    Joined:
    Sep 29, 2012
    Location:
    Michigan
    @ArizonaBOSS Your wish is my command. Not the fastest lap, but a bit of traffic to give perspective. Great run for shakedown and less than an hour of seat time:

     
  10. mpaige22

    mpaige22 TMO Intermediate

    Messages:
    13
    Likes Received:
    7
    Joined:
    Dec 9, 2017
    Location:
    NorCal
    @Black Boss I noticed you've been tracking the R for quite some time. Are you still on the original motor and supporting components?
     
  11. ArizonaBOSS

    ArizonaBOSS Because racecar. Moderator

    Messages:
    7,932
    Likes Received:
    1,388
    Joined:
    Dec 6, 2010
    Location:
    Arizona, USA
  12. VoodooBoss

    VoodooBoss Rick Moderator

    Messages:
    19,663
    Likes Received:
    2,137
    Joined:
    Nov 30, 2010
    Location:
    90 Miles East of Sonoma Raceway
    That sounds goooooooood!
     
  13. Kevin Guzniczak

    Kevin Guzniczak TMO Advanced

    Messages:
    168
    Likes Received:
    86
    Joined:
    Aug 2, 2017
    Location:
    Grand Rapids mi
    Gingerman is my home track. When did you do the shakedown? On Sunday? I was out there on Saturday and the weather went south in the afternoon.


    Sent from my iPhone using Tapatalk
     
  14. Black Boss

    Black Boss TMO Addict

    Messages:
    1,588
    Likes Received:
    1,032
    Joined:
    Sep 29, 2012
    Location:
    Michigan
    Yes, Sunday — started wet and improved in the afternoon.

    Meanwhile, added NASA class graphics:

    44141B4B-4217-4AC7-94E3-194687475FD2.jpeg
     
  15. Kevin Guzniczak

    Kevin Guzniczak TMO Advanced

    Messages:
    168
    Likes Received:
    86
    Joined:
    Aug 2, 2017
    Location:
    Grand Rapids mi
    Nice. Maybe I’ll see you out there next season


    Sent from my iPhone using Tapatalk
     
  16. steeda5

    steeda5 TMO Advanced

    Messages:
    127
    Likes Received:
    57
    Joined:
    Mar 29, 2015
    Thank you for sharing this build. What a beautiful, badass R you have built! Has to be a great feeling to get it on the track and enjoy it.
     
    ArizonaBOSS likes this.
  17. Black Boss

    Black Boss TMO Addict

    Messages:
    1,588
    Likes Received:
    1,032
    Joined:
    Sep 29, 2012
    Location:
    Michigan
    Hope so. Would be great to meet up!
     
  18. Kevin Guzniczak

    Kevin Guzniczak TMO Advanced

    Messages:
    168
    Likes Received:
    86
    Joined:
    Aug 2, 2017
    Location:
    Grand Rapids mi
    Agreed. No the LONG wait until next season


    Sent from my iPhone using Tapatalk
     
  19. Black Boss

    Black Boss TMO Addict

    Messages:
    1,588
    Likes Received:
    1,032
    Joined:
    Sep 29, 2012
    Location:
    Michigan
    At VIR today with good friends. Shakedown #2.

    First session, windshield (1/4" Optic Armor) started to buckle in at 150mph. (watch the circular sticker under the mirror):

    www.youtube.com/watch?v=QoDKp08QNQI

    Managed to get a support fabricated for session #2.

    IMG_6533.jpg

    Ditched the (slower) Contis after 2 sessions.

    Then had wheel balance issues -- the lighter body with Cortex solid bushings is WAY more sensitive to Tire slippage than the street car. Rear wheel vibration caused the Magneride controller connection to vibrate enough to loose CAN bus connectivity and put the car into limp mode.

    Got the wheels re-balanced and looking forward to tomorrow!
     
    Last edited: Nov 10, 2018
  20. spartan

    spartan TMO Race

    Messages:
    364
    Likes Received:
    585
    Joined:
    Dec 16, 2017
    Location:
    Michigan
    Hope day 2 at VIR is smoother than yesterday. Nice improvisation.
     
    VoodooBoss likes this.

Share This Page