C5Coupe

I am curious to know what the weight difference is between my Goodyear runflats in the front and a similar non-runflat? Does anyone know what is the lightest tire for the front in an OEM size? (not the skinnies)

kewlbrz

If it helps, I just weighed a front 17 inch C5 EMT goodyear at 29 pounds with no rim.

UtahVince

Expect to save about 5 to 6 lbs per tire. My Nitto 555 front tire weighed in at 24 lbs.

pburant

So it looks like in addition to the other benefits (please, no safety speeches - I realize what the advantages of a runflat are!), non-runflats will reduce your combined tire/wheel weight by about 10%. That's defintely good for a few virtual ponies.

IMQUIK

You can save them extra ponies for the walk when ya have a flat. :jester

kewlbrz

Thats true. And being rolling weight. Its worth more than dead weight.

Also, to note: 90 percent of the Z06's ~100 pound weight difference when compared to the coupe or ragtop, come from its lighter tires and exhaust.

Avanti

Yeah, and don't forget how much weight is saved on the Z06 by not having a rear storage cover!!! :lol:

C5Coupe

Yes rolling weight reduction translates into a greater benefit than just removing dead weight. I am considering going to non-runflats, lighter rotors and possibly Corsa's titanium exhaust. This should increase 1/4 mile times and MPH.

I am currently using BFG drag radials on the rear for dragstrip use only, but keeping the runflats in the front. I think making the change listed above should help my ET.

UtahVince

Actually, I think it's closer to 150 lb diff between C5 and Z06 (3200 lbs vs 3050). The Z exhaust saves 18 lbs, the tires 23. Also, the Z has thinner windshield glass (5 lb). But the biggest weight savings is the lack of a huge, heavy hatch on the Z, compared to the standard C5.

kewlbrz

I guess we can look at it officially :) Here are the official numbers for 03. The difference was a little less in the 01 Z06.

From GM 2003:
Coupe 3246
Z06 3118

difference 128 pounds.

A better way to say it (and 90 percent that I said was a a little off ;) ) Is that the exhaust and tires are the biggest 2 chucks of the weight. To me the thinner windshield, is negligible. Also the convertible has less weight above the door line than the Z06 and a lot less than the coupe. The other savings to me come from less options.

Also, as an aside, im actually baffled that an equivalently opitoned ragtop "officially" weighs 2 pounds more than a coupe. Given that the difference is the coupes gigantic heavy back glass and hard shell top and roof panel, relative to the ragtops aluminum frame and cloth.



Also to the original author of this thread, i looked up some old threads, and saw that someone weighed runflats against nonrunflats of similar size and saw about a 5 pound savings.

Also that rotating mass is equal to about 4:1 dead weight. So for every 10 pounds of rotating mass saved, is equal to about 40 pounds of dead weight.


[Modified by kewlbrz, 2:02 PM 1/17/2003]

adrnln1

Here are the official numbers for 03. They were even closer to 100 in 01.

From GM 2003:
Coupe 3248
Z06 3118

difference 128 pounds.

I don't know, but with my "New Math" that is 130 pounds :lol: :steering:

Jamn

I don't know about the weight difference, but I switched to non-runflats a few months ago, and this has been an unblievable positive up-grade for this car. As for flats, I just carry a small compresser for slow leaks, and I guess I will have to flat bed it in the event of a blowout. Even on run-flats, I have been told that flats are not repairable.

yellowvette837

Someone must have been sitting in the Coupe
:lolg: :lolg: :lolg: :lolg: :lolg: :lolg: :lolg:

Joe’s Z06

:lol: :lol:

kewlbrz

Ooops

I mis-put the number for the coupe, its 3246 as stated by GM. :crazy:

AP

:thumbs:

C6~Missle

don't forget the advantage of un-sprung weight. The ability to put the tire on the ground on rough road surfaces faster. This makes a huge difference in handling. Let's the shocks be more effective.
I take my chances.. so I enjoy the major performance increase 99.999% of the time.
In the event I do get a flat, I have a cell phone, air pump, mini jack and a plug.
mike :steering:

C5Coupe

Un-sprung weight is a good point, how do you maximize it on a C5? Obvious more weight out of the car is better....usually in the front. Rotating weight is even better. So what can be done to help?

Dave68

I agree and suspect that the stiffness of runflat sidewalls contribute significantly to "bumpsteer".

FXWG

"Bumpsteer" So that's the feeling I get when I hit a bump in the road and my car tends to jump sideways? I hate that feeling. I guess I might have to switch from the run flats to the non run flats, buy an air pump and a plug kit.
Thanks,
[IMG][/IMG] :auto: :auto:


[Modified by FXWG, 11:36 AM 1/18/2003]