Impact of Weight of Rims
#1
Impact of Weight of Rims
I am looking at 3 sets of 17s .. one weighs 18 pounds, the other is like 19.5, and the other is 21 pounds. How much will that kind of a difference in the weight of the rims impact the speed of the car? How bout approx how much time would it take off your quarter?
#2
Supporting Maxima.org Member
iTrader: (54)
Join Date: Feb 2001
Location: Northern Jersey
Posts: 10,166
Its not neccicarily the Weight of the rim cause they seem like light 17's, its the rotational force thats needed to turn the extra wheel, then if you get 17x8's the weight is farther away from the car so that plays a factor. Ive heard for every inch of upgrade it takes away 2 wheel hp which is pretty significant...wieght does play a factor but for 17's you dont have a worry too much
Once you get 18's then youll start to worry about a big loss
-Matt
Once you get 18's then youll start to worry about a big loss
-Matt
#3
Originally posted by matty
Its not neccicarily the Weight of the rim cause they seem like light 17's, its the rotational force thats needed to turn the extra wheel, then if you get 17x8's the weight is farther away from the car so that plays a factor. Ive heard for every inch of upgrade it takes away 2 wheel hp which is pretty significant...wieght does play a factor but for 17's you dont have a worry too much
Once you get 18's then youll start to worry about a big loss
-Matt
Its not neccicarily the Weight of the rim cause they seem like light 17's, its the rotational force thats needed to turn the extra wheel, then if you get 17x8's the weight is farther away from the car so that plays a factor. Ive heard for every inch of upgrade it takes away 2 wheel hp which is pretty significant...wieght does play a factor but for 17's you dont have a worry too much
Once you get 18's then youll start to worry about a big loss
-Matt
good luck
#4
For every pound you take off your rims, that is equal to taking out 8lbs of dead weight in your car.
You will also have to watch the offset as that will play a roll in rotating mass. A lighter rim with a crazy offset might end up hurting you then a heavier rim with the correct offset.
You will also have to watch the offset as that will play a roll in rotating mass. A lighter rim with a crazy offset might end up hurting you then a heavier rim with the correct offset.
#5
Originally posted by Synki
For every pound you take off your rims, that is equal to taking out 8lbs of dead weight in your car.
For every pound you take off your rims, that is equal to taking out 8lbs of dead weight in your car.
Theoretically, if I had MOMO's at 32 lbs each, then put on my Volks at 15 pounds, I have a savings of 17 pounds per wheel (Total of 153 lbs of un-sprung weight) mulitply that by 4, and you have a total of 68 lbs of wheel weight reduction and 612 lbs of unsprung weight. Rotating mass fits into that equation too....
#6
I've been trying to figure something out...
Do larger/heavier wheels actually cause you to dyno LESS, or is it just the extra weight that slows you down?
I could have sworn I read an article where all they did to this car is go to lighter wheels or something and it actually dynoed at 10 whp more or something. But maybe they meant that the effect was like-10whp from the rotating mass reduction and not that the car actually gained power...
I'm thinking now that heavier or lighter wheels will not affect dynos, but *will* affect your overall acceleration rate.
Any thoughts?
Do larger/heavier wheels actually cause you to dyno LESS, or is it just the extra weight that slows you down?
I could have sworn I read an article where all they did to this car is go to lighter wheels or something and it actually dynoed at 10 whp more or something. But maybe they meant that the effect was like-10whp from the rotating mass reduction and not that the car actually gained power...
I'm thinking now that heavier or lighter wheels will not affect dynos, but *will* affect your overall acceleration rate.
Any thoughts?
#7
Originally posted by SteVTEC
I've been trying to figure something out...
Do larger/heavier wheels actually cause you to dyno LESS, or is it just the extra weight that slows you down?
I could have sworn I read an article where all they did to this car is go to lighter wheels or something and it actually dynoed at 10 whp more or something. But maybe they meant that the effect was like-10whp from the rotating mass reduction and not that the car actually gained power...
I've been trying to figure something out...
Do larger/heavier wheels actually cause you to dyno LESS, or is it just the extra weight that slows you down?
I could have sworn I read an article where all they did to this car is go to lighter wheels or something and it actually dynoed at 10 whp more or something. But maybe they meant that the effect was like-10whp from the rotating mass reduction and not that the car actually gained power...
I know SCC had a few articles regarding this. If I can find it, I will quote from it.
BTW-Don, I thought a gallon of gas was 9lbs? Oh well...
#10
Originally posted by SteVTEC
I've been trying to figure something out...
Do larger/heavier wheels actually cause you to dyno LESS, or is it just the extra weight that slows you down?
I've been trying to figure something out...
Do larger/heavier wheels actually cause you to dyno LESS, or is it just the extra weight that slows you down?
A parallel situation could possibly be to dyno an automatic vs. a 5spd. If the auto drivetrain loss is ~24% and the 5spd is ~18%, than would the 5spd dyno more because more power would be getting to the wheels?
#11
A gallon of gasoline weighs 6-6.5 lbs. Water is 8lbs, gas weighs less.
The difference will not be dramatic, but you might notice it a little bit if you are very observant. In changing from a 37lb wheel and tire combo to a 30lb wheel and tire combo, I've seen about .1second and 1mph improvement in the 1/4 mile. Significant, but not very dramatic.
The difference will not be dramatic, but you might notice it a little bit if you are very observant. In changing from a 37lb wheel and tire combo to a 30lb wheel and tire combo, I've seen about .1second and 1mph improvement in the 1/4 mile. Significant, but not very dramatic.
Thread
Thread Starter
Forum
Replies
Last Post
0m3nc0w
4th Generation Maxima (1995-1999)
3
09-11-2015 05:21 PM