Drag tires for 20's?
Dec 1, 2004 | 06:11 PM
#84
Well, I could be wrong, but the moment of inertia doesn't change based on the wheel's location. You still have to spin that wheel up to the same speed. It should take the same amount of energy...
---EDIT---
OK, I thought about the 8 hp you made on the dyno and what power increase you would see from switching the front tires. The hp gained in the rear will be the same gained in the front by switching the rims and tires. But, I'm not sure you would see the same gain on the street due to rates of acceleration. If you can accelerate on the street at the same rate as on the dyno, you will see 8hp front and rear for a total of 16. But, if you can't accelerate at the same rate you will see less of a hp gain front a rear. I think that makes sense
---EDIT---
OK, I thought about the 8 hp you made on the dyno and what power increase you would see from switching the front tires. The hp gained in the rear will be the same gained in the front by switching the rims and tires. But, I'm not sure you would see the same gain on the street due to rates of acceleration. If you can accelerate on the street at the same rate as on the dyno, you will see 8hp front and rear for a total of 16. But, if you can't accelerate at the same rate you will see less of a hp gain front a rear. I think that makes sense
Dec 2, 2004 | 12:20 PM
#89
Originally Posted by unklej
Well, I could be wrong, but the moment of inertia doesn't change based on the wheel's location. You still have to spin that wheel up to the same speed. It should take the same amount of energy...
---EDIT---
OK, I thought about the 8 hp you made on the dyno and what power increase you would see from switching the front tires. The hp gained in the rear will be the same gained in the front by switching the rims and tires. But, I'm not sure you would see the same gain on the street due to rates of acceleration. If you can accelerate on the street at the same rate as on the dyno, you will see 8hp front and rear for a total of 16. But, if you can't accelerate at the same rate you will see less of a hp gain front a rear. I think that makes sense
---EDIT---
OK, I thought about the 8 hp you made on the dyno and what power increase you would see from switching the front tires. The hp gained in the rear will be the same gained in the front by switching the rims and tires. But, I'm not sure you would see the same gain on the street due to rates of acceleration. If you can accelerate on the street at the same rate as on the dyno, you will see 8hp front and rear for a total of 16. But, if you can't accelerate at the same rate you will see less of a hp gain front a rear. I think that makes sense
Dec 2, 2004 | 12:27 PM
#90
is pretty much what I have to say.Bottom line is:
Wheel & Tire assemblies that have a majority of their weight pushed out farther from the center...will have an effect on power, accel, and decel. There are times where a 16" assembly could be more hurtful based on wheel choice, but generally speaking the larger diameter 20-22-23-24" stuff will really start taking its toll. Even if its a relatively light 22" package like mine 75lbs total per corner.
Bigger wider tires up front will increase rolling resistance 1st...which will hurt accel.
You want the lightest possible assembly you can get with the weight as centered as possible to get the best results for drag applications.
I dont think anyone should dwell to far in to this. If you wanna run 10s...run 15" or 16" on slicks. If you wanna go 11s-13's and look good, buy some light 20-22s and buy a bit more hp while you're at it
