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Thread: What to do for lt1 restrictor plates?

  1. #1
    Senior Member Grass-Passer
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    What to do for lt1 restrictor plates?

    Are these 4th gens with lt1 typically requiring a restrictor?
    If so where can I find such a thing?
    Signed
    Confused and scared Ford guy

  2. #2
    They do if they're running right. I've seen them but don't know where to buy them. You can probably get a set made at any sheet metal shop.

    - Josh
    CMC #50

  3. #3
    Senior Member Carroll Shelby ShadowBolt's Avatar
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    Quote Originally Posted by Sook View Post
    They do if they're running right. I've seen them but don't know where to buy them. You can probably get a set made at any sheet metal shop.

    - Josh
    I made a ton of sets for Boudy years ago. Last time I talked to him he still had some.

    JJ

  4. #4
    Member Rookie 39PitCrew's Avatar
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    Quote Originally Posted by NASA13 View Post
    Are these 4th gens with lt1 typically requiring a restrictor?
    If so where can I find such a thing?
    Signed
    Confused and scared Ford guy
    Several of the guys have gone to exhaust restrictors.
    On the cars that I wrench on, I hated how much oil got
    trapped up around the throttlebody because of the wierd
    air flow around the restrictor plate. Sean (#15), Paul (#88)
    and David (#39) have all converted over to tail pipe
    restrictors. They aren't hard to install or tune.
    --
    ------__o
    -----_\ <,_
    ----(_)/ (_)
    Laissez les bons temps rouler

  5. #5
    6.21.4 All Cars may install a restrictor between the air filter and intake manifold to reduce horsepower and torque. The diameter and thickness of the restrictor plate orifice(s) shall be noted on the Dyno Sheet and must match at all times. Carbureted cars may install a mechanical throttle stop on the carburetor linkage for the same purpose. Throttle stop dimensions must be noted on the Dyno Sheet for inspection purposes and must match at all times.

    6.24.3 Any suitable exhaust system may be used after the manifolds (or headers on cars that are allowed headers). The exhaust must exit behind the driver and be directed away from the car. Mufflers may be required to meet sound regulations depending on track location.


    Was/is there a reason that an exhaust restrictor is not specifically mentioned in the rules?

  6. #6
    Senior Member Carroll Shelby Fbody383's Avatar
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    Quote Originally Posted by CMC Rules
    6.24.3 Any suitable exhaust system may be used after the manifolds (or headers on cars that are
    allowed headers). The exhaust must exit behind the driver and be directed away from the car.
    Mufflers may be required to meet sound regulations depending on track location.
    It's in there...

    As I understand the intent of HP/TQ rule, one would declare (as I do) that there is an exhaust restrictor. Certainly I can change that but gain the risk of being non compliant, and non compliant on purpose gets too close to trying to circumvent the rule, or cheat, if you will.
    Last edited by Fbody383; 04-16-2018 at 04:12 PM.
    #39 CMC Camaro
    Orange is Fast!
    CMC-NT01 FTW!

  7. #7
    Senior Member Grass-Passer Supercharged111's Avatar
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    I think I'll add that to my RCR list this year. Make it more clear that exhaust restrictors are allowed as they seem to fall within the intent of the series. How easy are they to police? We'd need to update the dyno sheet too so it has a more definitive home.
    RM CMC Director

  8. #8
    Senior Member Carroll Shelby AllZWay's Avatar
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    I think I still have a set I got from Jerry or Mitch. Not sure what sizes are there though.

  9. #9
    Senior Member Carroll Shelby ShadowBolt's Avatar
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    Quote Originally Posted by AllZWay View Post
    I think I still have a set I got from Jerry or Mitch. Not sure what sizes are there though.
    I made them for you.


    JJ

  10. #10
    Senior Member Carroll Shelby AllZWay's Avatar
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    Quote Originally Posted by ShadowBolt View Post
    I made them for you.


    JJ
    I know I got one set from you and I got another set from Mitch after he quit racing. I am not sure which set went with the car when I sold it.

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