Control requirements applicable to all Ultra4 competition vehicles.
Section 2.14 • Common Vehicle Requirements
2.14.1
All throttles, whether controlled by hand or foot, must have at least one return spring of sufficient stiffness to instantly close the throttle plate when the throttle is released. Carbureted vehicles must have at least two throttle-return springs, at least one of which must be attached to the carburetor. All vehicles should have at least one throttle return spring at the throttle plate and one at the throttle control (pedal or hand control). Computer controlled throttles (Electronic Throttle Control or “drive- by-wire” systems) are exempt from the requirement to have a return spring at the throttle body but must have a return spring at the throttle control (pedal or hand control) or maintain the stock OEM system. A positive stop or throttle override system must be used to prevent throttle linkage from sticking in an open position.
2.14.2
Adaptive controls may be used, as required. Hand throttles must meet the same requirements as a foot throttle and must meet with the approval of Ultra4 and FOCUS.
