Add to Appendix F. Technical Glossary
#31891 from Club Racing Board · Rule change · TB 22-01 (2022-01 Fastrack)
In GCR, Section Appendix F. Technical Glossary, add the following:
"TBR - Throttle Body Restrictor
- All throttle body (TBR) restrictor plates must be made of aluminum, and must be a minimum of 0.375
inch thick and a maximum of 0.500 inch thick. The maximum inlet radius must be 0.375 inch. The remainder of the restrictor bore
must maintain the required diameter. No other radiusing, tapering or chamfering is allowed. It must be mounted directly in front
of the inlet (primary) side of the throttle body."