The Dyna DRL-400 Two Stage Rev Limiter has been 
specifically designed to maximize launch performance and over-rev protection in 
drag racing. 
The DRL-400 allows a precisely controlled launch rpm 
limit to be set, while also guaranteeing against over-rev damage due to missed 
shifts or drive train breakage. Selection between the launch limit and the upper 
over-rev limit is usually made through the use of a clutch lever switch. Both 
rpm limits are adjustable via two knobs on the DRL-400. 
The DRL-400 constantly monitors the engine rpm with 
great precision and randomly deletes ignition pulses to hold the engine exactly 
at the desired rpm. 
The DRL-400 can hold a 270 horsepower engine to a 
steady launch rpm with less then +/- 50 rpm wavier. Other launch rpm limiters 
typically make the engine rpm waive through a pounding oscillation. This can be 
very hard on expensive racing components. 
The DRL-400 works with all inductive electronic 
ignitions on 2 and 4 cylinder engines. It is housed in a 3 3/4" x 2 3/8" x 1" 
plastic case with integral mounting flanges. 
DRL-400 Features: 
Accurate launch limiting with 32 different settings 
Smooth, non destructive launch limiting 
Adjustable high limit between 16 different settings 
Will NOT work on motorcycles with coil on plug 
"stick" coils