Anyone have an idea which is lighter?

The TT2 is a 17x9.5 vs a 16x8 silver painted salad shooter.


Trying to decide if I should run the salad shooters up front at the drag strip, or not bother. Unfortunately I don't have a way to weigh them.

 

The TT2s would be heaver, but im not sure how much. The stock wheels are 19.5lbs (from the FAQ). I wouldnt bother putting them up front, its probly only 10lbs difference total.

 

Yeah I was thinking it would be a minimal difference... However


One factor I'm thinking about is the fact that the stupid drag strip I run at has no way around the water box. It's narrow, and they spray the whole damn thing with water from K-rail to K-rail.

Since my ET Street Radials out back are 255, I was thinking the water tracks being left behind by my 275s up front are really going to be quite a path of water for my rears. Even though 245s are far from being pizza cutters I was thinking that may help, even if ever so slight.

 

I've got a couple unmounted 9.5" TT2 wheels. I'm at work now but if I don't get forced to come back when I get off in the morning I'll weigh one for ya (and add it to the FAQ! )

 

Also, I wouldn't think there would be a 10lbs difference but my point being, if it were that much, that is A LOT. Rolling weight affects your drag strip time much moreso than just weight sitting in the car. I think it is by a factor of 5 but somebody please correct me if I'm wrong. Meaning, if each wheel is 10 lbs heavier then that's 20 actual lbs but will affect your times like it is a 100 extra lbs. 100 extra lbs will increase your time by around 1/10th in a basically normal street car.

 

I heard a factor of two.

(And I heard it on here, not from any reliable source or anything.)

 

According to "Chassis Engineering" by Herb Adams, it is a factor of 3.

"All the rotating parts in the chassis have inertia which resists angular acceleration. These parts include the tires, the wheels, the brake rotors, the hubs and the ring gear and the differential. To show the effect of the rotating inertia on these parts that turn at wheel speed, we used the same sample car but with a 15-lb. reduction in these parts. Under the same test conditions, the 15-lb. reduction in rotating inerttia would allow the car to accelerate to 113.34 mph for a .60 mph improvement. This shows that a 15-lb. reduction in rotating inertia on the chassis rotating parts will have three times the benefit of a 15-lb. weight reduction on the rest of the car. The 15-lb. reduction in chassis rotating weight was assumed to be a 12-inch diameter steel disc of constant section mounted on the rear axle drive flanges."

In another paragraph;

"Components that rotate at axle speed are 3 times as effective as non-rotating components."

 

Do we have a 4?

 

TT II 17x9 = 24 lbs

No idea about the salad shooters, but the 16" painted LS1 Z wheels are 17 lbs.

 

i wana see pics when you mount your TT2s

 

I have 4 mounted... the two unmounted are extras

http://www.brentfranker.com/gallery/album02