I'll be getting the Z out of winter storage soon - considering going on a small diet (i.e., remove spare, get low weight battery, empty wiper fluid, etc. and maybe move to lightened flywheel and exhaust eventually).

So, I wanted to see how much weight I added by upgrading wheels (19" TE37s).

Upon a quick search I found this:

rear stock (17"): 24 lb rim and 29 lb tire for a total wt. of 53 lbs.

rear now (19" TE37 with Toyos): 21 lb rim and 28 lb tire for a total of 49 lbs.

To my amazement, it looks like I actually saved a few pounds per wheel! I'm looking for a reality check - is my data, which is from the web, not my personal measurements, reasonable?????

Thanks

Kev

 

Yes, that is probably correct. Weds tc105n FTWS(for the weight savings)

 

Here is a rear 19x10.5 with a 275/35/19 Toyo T1R weighing in at 49.9lbs.

 

One wheel is cast and the other is forged. Think about it.

 

Ok, cool - looks like the values I found on the web are reasonable - I may not have saved much weight, but at least I didn't ADD any!

Kev

 

Typical reply for this forum.

I understand one is cast the other is forged. The one that is forged happens to be signifanctly larger smarty.

 

Its bigger but weighs less. Beautiful wheel BTW.

 

Jesus thats a sexy wheel.

 

You'll definitely save weight - I did. I went from the stock 18" wheels and OEM tires (53/57lbs) to 19" LE37Ts with Michelin PS2s (44/48lbs).

 

You saved some weight, but moved a majority of it away from the center of rotation, this requires a greater wheel torque to spin it so your gains are probably being offset by the larger size. Don't expect any differences in acceleration

 

+1! It's all about the polar moment of interia.

 

That just sounds really cool and makes me want smaller wheels even though i don't have any idea what you are saying.


hahahaha, just kidding...i kinda understand.

 

Yep that is correct. My le28n's are 19x10.5 in the rear w/ Toyo ts1's and weighed in at 46lbs. I think my stock 18x8.5 were 53lbs or something.

 

Unsprung weight FTMFW!

 

nerd. haha.

 

Yea, I figured. When I originally set out, I wanted to see how much wieght I added. I was surprised that I hadn't added any. But, I didn't get too exicted about the so-called reduction becuase I new I had less weight overall, but more weight distributed further out.

 

Sprung or unsprung - all wieght is the enemy

 

I was concerned about the same thing, but after doing some rough calculations, with my weight savings, the inertia before and after worked out about the same. In other words, the mass moved farther out, but the lower mass cancelled out the radius change.

 

I agree, thats why I said don't expect any changes in acceleration, should be roughly the same moment of inertia

 

LOL