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2019 RCR #6


Al F.
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Rule reference 6.24.4


Recommended Revised Wording:

All Cars may install a restrictor in the exhaust to reduce horsepower and torque. The diameter and thickness of the restrictor plate orifice(s), and/or the exact specifications (manufacturer and part number are also sufficient) of exhaust restrictors shall be noted on the Dyno Sheet and must match at all times.


Reasoning for change MUST include at least 1 of the following:

Will provide more clarity because we already have cars running exhaust restrictors and the concept is proven. This will clarify how to enforce a device that can be removed after the dyno and ensures that accurately capturing it on the dyno sheet is now a requirement.

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  • 2 weeks later...

Some questions:

How does an exhaust restrictor get measured after a race? Isn't it hot as hell?

where is it located? Standard location? Or anywhere ?


Why is an exhaust restrictor being used now? I haven't seen anywhere in the rules that say you can restrict HP and TQ by manipulating the size of the exhaust with a restrictor.

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Exhaust is open from the manifolds back, always has been, so you’ve always been able to manipulate power by the design of your exhaust.

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The size and type of exhaust is noted on our dyno sheets.


I find it interesting that it is legal to restrict HP and TQ with an exhaust restrictor. The only section I find about methods to restrict are:


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

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