not everyone here is an expert but i am,

"but these comments are made without hands on knowledge or scientific backing. They use big words like "rotational mass" because others have, but hardly know what it means let alone whats its actual effect is in your application or how to calculate it. I didn't loose ANY hp on the dyno, in fact I had the best run out of half a dozen other S2K's during a dyno day, and like the other guys I just had an intake and exhaust at the time. "


i used to make wheels for a living via CNC 1 peice 18/19 and 3 piece 17/18/19 for the grand american series and also for a small group of private buyers w/ high end vehicles.

given my wheels were made of 6061 t6 forged alum. were very light.

rotational mass.. ur putting the hoop of the wheel 1" further from the center. hopefully you know physics and the effect this has. ill give u the satisfaction of saying ur wheels prolly are very light.. but not all are.

so... before you get cocky and try and act high and mighty know who ur talking to.about.

like i said. i wasnt going against 19's just for the S their not ideal

 

also hahhnn

the dyno doesnt measure your 0-60 or from a start.. u cruise up to 3rd gear and then take off in 3rd hopefully.

therefore the wheels are already spinning.

the main problem w/ added centripetal mass is the initial movement up to a certain speed and the stopping of such movement to 0 from a certain speed.

hence taking off and braking.

guarantee you that with your wheels doing a dead 60mph-0 stop with exactly the same mods.. just putting stocks vs 19's the braking distance w/ 19's will be approx 100-150t further

try it..

 

Stocky,
Acari Racing model AL-7. Far as I know only a few sets were made for whatever reason. I've heard the company went out of business and/or was sold, but that could just be a rumor.

Here is a pic of Mugen Kid's ride with a set.





rijowysock,
Honestly I don't care what your background is, I wasn't out to attack you, I was just using that comment as an example. It is a blanket statement that isn't true. I know because I really do have 19" rims on my car, and I have daily driven on them for a couple of years now. I actually have run comparisons by switching back and forth to my 16" stockers and the difference is marginal at best. Other members who have actually run with this wheel (Acari AL-7) have said the same thing as I am now. Do a search for Mugen Kid, Kuni, or Talon Tid.

You want to say: "guarantee you that with your wheels doing a dead 60mph-0 stop with exactly the same mods.. just putting stocks vs 19's the braking distance w/ 19's will be approx 100-150t further, try it". My response is that I have, you have not, go find out for yourself.

-Nate

 

im done w/ this thread. ****ing ameteurs.

i used to have software that u would put in the material and shape and it would do the math for you.

ive ridden 19's as well. over 20 sets and just now goin to 18's.

i swear you go on this site knowing something and everyone tries to tell you , you dont know what you know.
ur wheels are cnc'd and prolly VERY light.


lets ask the creator of this thread what wheels hes looking at. im pretty SURE their not CNc'd 6061 w/ VERY thin spoke design monoblock.

nuff said. flippin site sometimes not even worth the 20$ to be a member im done posting help

 

So I disagree with you, big deal. Isn't that the point of a forum, to discuss things and argue about things? I do agree that there are many 19" wheels, and for that matter 17" and 18" wheels, that are cheap heavy pieces of crap that will have a large negative effect your cars performance characteristics. I agree that it will especially be shown in the acceleration and braking aspects of your cars performance. Heavier wheels are bad for performance, I think we all agree on that, and heavier wheels that are larger in diameter are even worse. However, if you go with a wheel larger in diameter BUT KEEP IT LIGHT the negative performance effects can be minimized. Therefore not all 19" rims will screw up the ride characteristics of our beloved S. I read this a while ago and my personal experiences seem to agree with it, what do you think. Note that this is theoretical and doesn't convert directly into the real world where there are so many variables.


For rims, usually most of the mass is concentrated around the outer circumference. If, for a moment, we assume that all 15lbs of mass is around the outer edge, we get ('I' stands for Inertia):
15" rim -> I = 5.86 lb*ft^2
16" rim -> I = 6.66 lb*ft^2 (12% increase)
17" rim -> I = 7.53 lb*ft^2 (28% increase)

Now let's add in the weight of the tire.
Let's say it

 

b16horse,

This is your thread and if you feel none of this is helpfull or it is cluttering I can remove it.

-Nate

P.S. I just noticed that the thread title is asking about 19 foot rims so I guess what I'm saying really doesn't apply if you want to go THAT big.