Front Runner and how they affect ET and Speed

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moparspares

moparspares

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Like some info on front runner size and how it affects ET MPH and 60ft. At the track today and my brothers challenger ran 11.34 at 121.7MPH 1.67 60ft. I noticed he was only running a 24" front runner and 28" slick on rear. How different would these stats be with a 28" front runner. Thought there might be a calc for this but cant find one.
 
No different I imagine. Drive is through rear wheels.

Might change stance for aero.

Weight shift to rear wheels might occur quicker because the front is jacked up 2".....
 
Not sure about MPH but the 28" should change the 60' due to the roll out difference I believe . Been awhile since I've raced and had to figure any of this out .
 
DAndy ART said:
No different I imagine. Drive is through rear wheels.

Might change stance for aero.

Weight shift to rear wheels might occur quicker because the front is jacked up 2".....
Click to expand...

Yeah didn't really think about that. Weight transfer on this car was a problem too as it had the heaviest torsion bars and sway bar until he swapped it out to standard stuff a couple weeks ago. It now does lift in the front and transfer the weight nicely. The 28"s may help even more I suppose. The heavy duty stuff was fantastic on track days. Man you could throw the thing into corners and it stuck like glue.
 
moparspares said:
Like some info on front runner size and how it affects ET MPH and 60ft. At the track today and my brothers challenger ran 11.34 at 121.7MPH 1.67 60ft. I noticed he was only running a 24" front runner and 28" slick on rear. How different would these stats be with a 28" front runner. Thought there might be a calc for this but cant find one.
Click to expand...

Assuming shallow stage the taller front might give it a little better 60' as it would have a little more run on the beam but it would be small,the reaction time would suffer and the taller tire would most likely weight more
 
It's a difference in roll out and how that effects the staging beams. Larger diameter will light both bulbs, and will not roll out of the "stage beam (which starts the clock) as quick as a shorter roll out. I used a 28" front tire, and deep staged at times.
 
What moper said.

Staging exactly the same, along with everything else, a taller front tire will have a faster 60'/ET and slower RT.

A taller tire might hurt aerodynamics a bit by letting more air under the car, but Mopars can easily compensate for that with a torsion bar adjustment.

Focus on consistent RTs because that, not fast ET or MPH, wins most bracket races. A person trying to change their physical RTs is not very consistent. Find a comfortable "spot" and mechanically change the vehicle RT with tires, air pressure, stage RPM, carb tuning, converter, etc. Last resort is "bumping" in if they need to be quicker. But that's not always as consistent either. Some cars, especially slow ones, are difficult to work with.
 
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