IHRA rule questions

[Ron Gusack]

The 2013 rules for Hot Rod say stutter boxes are not legal. Is this new for 2013?

This means cars no longer pause for x amount of time and then go, right?

[HR9121]

It has always stated that stutter boxes are prohibited but also says that down track throttle stops are permitted in the same section. Not sure what a stutter box is myself. hope this helps you.

[tj310]

Stutter on the box lol
---Trevor

[Bill Baer]

I believe a "stutter box" was a timer controlled rev limiter and as I recall they were quite accurate at hitting the index.

[Ron Gusack]

I thought a stutter box was a timed rpm limiter and a throttle stop was a device that limited throttle opening.

So nothing has changed from a few years ago, right? They still leave, fall on their face and then bolt to the finish line. So you get numbers like 10.91 at 141.23 mph.

[Tom Goldman]

Stutter boxes used a timer to turn a down track rev limiter off and on.
It was amazingly accurate at controlling the ET.
As engines got more HP the timers were on so long , some cars went nearly to the 1000' on the rev limiter.
It also sounded like crap and was responsible for more than a few engine failures ,which is what prompted their banning many years ago.
I think they've been illegal since '89 in NHRA.

[fatdog]

If stutter boxes where legal i would be runnig 9.90 @130 mph,
.

[Freddie]

Is this something different that setting the rpm chip in the MSD? I would think that putting a lower chip in will allow you to control how the car runs as well.

I have another question with the IHRA rules...

I noticed H/R (S/ST) is a 2600# minimum but there is no mention of minimum wieght in S/R (S/G)? NHRA S/G is 2100# is there no minimum in S/R?

Not that I can get my car much lighter than 2100#, but just wandering. I dont want to show up at a race and find my car is too light.

[danny waters sr]

Originally Posted by Freddie

Is this something different that setting the rpm chip in the MSD? I would think that putting a lower chip in will allow you to control how the car runs as well.

I have another question with the IHRA rules...

I noticed H/R (S/ST) is a 2600# minimum but there is no mention of minimum wieght in S/R (S/G)? NHRA S/G is 2100# is there no minimum in S/R?

Not that I can get my car much lighter than 2100#, but just wandering. I dont want to show up at a race and find my car is too light.

They never weigh s/r cars............only stock /superstock and h/r and top sportsman and top dragster.....at nitro jam races ..............pro-am div races weigh stock / superstock only.......