NHRA Announces 2016 Pro Stock EFI Requirements
The NHRA announced its rules and requirements for the 2016 Pro Stock class as the category converts to electronic fuel injection system (EFI). Holley has been named as the sole provider for the EFI systems. The changes are being made to move the category to a more technologically forward position as well as control costs by requiring an NHRA-controlled 10,500 Rev Limiter to the EFI.
Beginning in 2016, NHRA also will require Pro Stock teams to remove all hood scoops and reduce the length of the wheelie bars to a length specified by the NHRA Tech Department.
Here are the requirements for the EFI:
NHRA 2016 PRO STOCK EFI REQUIREMENTS
- Engine Control Unit:
o Holley HP ECU part number 554-129 mandatory
o EFI closed loop functionality permitted
o Rev Limiter:
- NHRA hard limiter set to 10,500 rpm
- Teams have the ability to set soft limiter to desired rpm level
- Throttle Body:
o Holley part number 112-123 mandatory (25 sq. inches)
o Must be mounted forward facing and remain in the engine compartment
- Fuel Injectors:
o Holley part number 522-568 mandatory
o Maximum of 8 injectors permitted
o Must be mounted externally on intake manifold runners
o Injector tips may not be modified and diffuser plates may not be added
o Use of standard Holley supplied extenders only permitted
o Holley HP Smart Coil-Near-Plug Smart Coil (8 ea.) Holley part number 556-112 mandatory
- Fuel Delivery System:
o 90 psi Max
o Earl’s Performance Dry Break Coupler part number JV270204RL mandatory
o Coupler must be remotely mounted on the fuel line between the fuel pressure regulator and fuel rail
o Coupler must be easily accessible by NHRA Technical Department
- Hoods:
- Must be original OEM design, any variations to the hood must be submitted by the OEM and accepted by NHRA Technical Department prior to running in competition
- Maximum hood height from ground will be determined at a later date
- Air Intake:
- Must be located below top of front grill
- Opening in body (location and dimensions) must be submitted by the OEM and accepted by NHRA Technical Department prior to running in competition
- Sensors (mandatory):
o Holley Hall Effect Crank Sensor Holley part number 554-118
o Holley Hall Effect CAM Sensor Holley part number 554-127