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  1. #1
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    anyone have experience with restrictor plates

    For NASA TT I need to drop RWHP to 600 or a little less. I'm guessing I am currently 650 to 675 (12-15% drivetrain loss as it's 765 engine stand dyno)

    I'm going to start with a pair of 45mm plates.

    Any opinions on if that's to small?

    This is on the ACR-X
    2017 ACR-E (a real one)
    2010 ACRx #24

  2. #2
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    check with Stan Wilson ( don't know if he on here) but he's on FB. He had to use one on his G4 if I remember correctly. He also had to add 200 lbs weight I think for the group he raced in.
    2017 GTS Competition Blue
    1998 RT/10 Silver 6.5 Roe S/C, 1.7 HS RR's, Roe Hi-Flow Cats, B & B Headers/3" exhaust, 3.33, Eibachs, SRT front brake upgrade, Toms 40mm rear upgrade .....

  3. #3
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    For that engine you could also speak with Fred Lux at Lux Performance. They're running restrictors on the X in Trans Am and have done some development work though at this point they are running the Gen V intake.
    -2008 Venom Red ACR Hardcore

  4. #4
    Quote Originally Posted by catwood View Post
    For NASA TT I need to drop RWHP to 600 or a little less. I'm guessing I am currently 650 to 675 (12-15% drivetrain loss as it's 765 engine stand dyno)

    I'm going to start with a pair of 45mm plates.

    Any opinions on if that's to small?

    This is on the ACR-X
    What TT class are you trying to get in to?

  5. #5
    Supporting Vendor JonB ~ PartsRack's Avatar
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    Quote Originally Posted by str5010 View Post
    For that engine you could also speak with Fred Lux at Lux Performance. They're running restrictors on the X in Trans Am and have done some development work though at this point they are running the Gen V intake.

    Yup
    Jon "JonB" Brobst ~~~~:<~ JonB@PartsRack.com


  6. #6
    VOA Mamba Member
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    Quote Originally Posted by 13COBRA View Post
    What TT class are you trying to get in to?
    TT1
    2017 ACR-E (a real one)
    2010 ACRx #24

  7. #7
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    Could also run 100 treadwear tires, not sure if that would get you into TT1 or not... You get +.5. Maybe that and throwing in a few lead bags in the back cargo area would get you there. Then at non-nasa events would be easier to run your slicks and take the bags out then take off the restricter plate.
    2013 caged 803whp 9.0 liter, 2016 ACR, 1996 GTS, 2001 RT/10, 2003 SRT/10, 2018 McLaren 720s, 2020 G63, 2005 Ford GT, 2019 Megacab Dually

  8. #8
    VOA Mamba Member
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    Talked to Fred, great guy and says 45mm is a good starting point. He gave me some pointers on making it easy to get the restrictors in and out, so easy so that won't be an issue. If I went to 100 treadwear I bet I wouldn't need a restrictor at all but I could only find TOYO PROXES R888R and then I'd have to run a 19" rear which I have but don't like. That might be interesting. But I think I'll go with the restrictor route first. The car would classed at 3500 lbs which is easy with my fat ass and some extra fuel in the car and dyno 603 or less. It has to weigh that at the end of the session if you place but the dyno pull allows for 2 or 3% variance. But the baseline needs 603 or less with 3 pulls. I need to get this wrapped up before March which shouldn't be an issue.
    2017 ACR-E (a real one)
    2010 ACRx #24

  9. #9
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    Quote Originally Posted by catwood View Post
    Talked to Fred, great guy and says 45mm is a good starting point. He gave me some pointers on making it easy to get the restrictors in and out, so easy so that won't be an issue. If I went to 100 treadwear I bet I wouldn't need a restrictor at all but I could only find TOYO PROXES R888R and then I'd have to run a 19" rear which I have but don't like. That might be interesting. But I think I'll go with the restrictor route first. The car would classed at 3500 lbs which is easy with my fat ass and some extra fuel in the car and dyno 603 or less. It has to weigh that at the end of the session if you place but the dyno pull allows for 2 or 3% variance. But the baseline needs 603 or less with 3 pulls. I need to get this wrapped up before March which shouldn't be an issue.
    For me, I'd rather have the stickier tires and take the horsepower hit. That's why I run slicks on the ACR in TT1 and only 540whp. I'm right at 6.0, you should dominate TT1 with A7's and 3500 lbs 600whp. Only thing that will beat you are Cup Cars with good drivers, they are unbeatable in TT1.
    You should get like three different restrictors from him, then hit up the dyno shop and get it as close as you can. Make sure the dyno shop is nasa approved and has the 50rpm increments
    2013 caged 803whp 9.0 liter, 2016 ACR, 1996 GTS, 2001 RT/10, 2003 SRT/10, 2018 McLaren 720s, 2020 G63, 2005 Ford GT, 2019 Megacab Dually

  10. #10
    Quote Originally Posted by catwood View Post
    For NASA TT I need to drop RWHP to 600 or a little less. I'm guessing I am currently 650 to 675 (12-15% drivetrain loss as it's 765 engine stand dyno)

    I'm going to start with a pair of 45mm plates.

    Any opinions on if that's to small?

    This is on the ACR-X
    Lots and lots of experience with restrictor plate racing UNFORTUNATELY. If your not going to win or podium dont run them; Save your time and money until you need to restrict. If you think your going to podium and your going to get teched run them. Creative engineering and chaos advantage is always required with restrictor plate and homologation racing.

  11. #11
    Quote Originally Posted by catwood View Post
    For NASA TT I need to drop RWHP to 600 or a little less. I'm guessing I am currently 650 to 675 (12-15% drivetrain loss as it's 765 engine stand dyno)

    I'm going to start with a pair of 45mm plates.

    Any opinions on if that's to small?

    This is on the ACR-X
    To close to HP they want dont run any restrictor. Spend you time elsewhere. You start winning and driving around everyone then figure it out.

  12. #12
    VOA Mamba Member
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    I have to do three pulls to get the car teched before I can run. It has to show I'm legal to spec for the year.
    2017 ACR-E (a real one)
    2010 ACRx #24

  13. #13
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    Quote Originally Posted by TKO MOTORSPORTS TEAM View Post
    To close to HP they want dont run any restrictor. Spend you time elsewhere. You start winning and driving around everyone then figure it out.
    He needs to run TT1 to even have a chance to podium. The TTU (unlimited) class in nasa is dominated by prototypes etc, no door slammer can come close. Think 700whp, 1900 lb Ginetta's with 2500 lbs downforce.
    2013 caged 803whp 9.0 liter, 2016 ACR, 1996 GTS, 2001 RT/10, 2003 SRT/10, 2018 McLaren 720s, 2020 G63, 2005 Ford GT, 2019 Megacab Dually

  14. #14
    VOA Mamba Member
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    Well, I got the restrictor plates in, 45mm, and I'm off to the dyno early next week. Hopefully it's damn close without much modifications. Will report back
    2017 ACR-E (a real one)
    2010 ACRx #24

  15. #15
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    Toyo R888's are available in 18/19 but may not be listed.
    specialtyperformanceteam.com
    310-597-6295

  16. #16
    VOA Mamba Member
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    Quote Originally Posted by Dan Cragin View Post
    Toyo R888's are available in 18/19 but may not be listed.
    That's definitely in the back of my thoughts.
    2017 ACR-E (a real one)
    2010 ACRx #24


 

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