Originally Posted by Tod74
This topic just came up in another thread and it was mentioned that using the delay box to activate the shifter is illegal in NHRA AND IHRA...so IF you plan to run either of those you may want to use a seperate rpm switch such as MSD.
Not sure where this came from, using a timer in the delay box is quite common to shift the car with, especially in Super Comp where it is usually shifted while on the stop, when it comes off the stop it is already in second gear and won't be as violent. It is a fixed time that can not be changed during the run. What they don't want is a computer adjusting the shift point DURING the run to control the ET.
Is it a powerglide? You only need it once.