Another Question About Weight
Le Mans Master
Joined: Dec 2004
Posts: 5,492
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From: West coast CA
Pointlessly nasty
So the OP admits they don't ever drag race or road race (AKA Poser). What's the point of this post? The C7 is far superior to your 2009 C6, no matter what the weight. It sounds like another attempt to justify why you should keep your C6.
Even racers who spend a lot of time on the track are not as obsessed by weight as a bunch of individuals on this site. I'm almost ashamed that I contributed anything to another worthless post about weight.
Even racers who spend a lot of time on the track are not as obsessed by weight as a bunch of individuals on this site. I'm almost ashamed that I contributed anything to another worthless post about weight.
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St. Jude Donor '13-'14-'15
Did MT actually weigh the GS you are referring to? How else did they know it weighed 3375 pounds? maybe they didn't weigh the GS, but instead looked at the GS's gross weight(posted on the car) and subtracted the cargo weight(also posted on the car) and came up with the 3375 pound figure.Most likely the GS that MT weighed(how else would they know its actual weight since they didn't quote GM's curb weight of 3311 for a base model with zero options) had a higher trim level and other options that caused that particular GS to be 64 pounds heavier than a base GS with zero options.
...
It's not rocket science to understand why a car that is weighed, weighs different from a manufacturer' stated curb weight. It does not mean that the manufacturer is a liar, or the magazine, with their stated weights.
...
It's not rocket science to understand why a car that is weighed, weighs different from a manufacturer' stated curb weight. It does not mean that the manufacturer is a liar, or the magazine, with their stated weights.
http://www.motortrend.com/av/roadtes...res_road_test/
They even frequently refer to their "scales" and weighing test cars in road test reviews...
So does Edmunds, Car and Driver and I would presume many or most of the other rags.
My understanding is that GM's curb weight is "the weight of the vehicle without driver, passengers or cargo but including maximum capacities of fuel, oil, coolant and other items of standard equipment".
The 3298# is an official GM number for a non-Z51 car, which is likely a base 1LT car with no/few options...i.e. "standard equipment". The 3444# is a number that was published in rags (Automobile published 3404#, another rag-which I'd have to find-published 3386#) that tested a 3LT (we know this based on the pictures of the interior) Z51.
And I fully understand the effect that options have on a vehicle's weight, and seldom refer to the door tag as the true weight for the vehicle. Typically, I'll weigh my cars at the dragstrip to determine race weight.
I'm skeptical that the Z51 package is 146#. The biggest component of weight is the dry sump, which is likely ~35#. Small aluminum radiators and plastic cooling fans and shrouds don't weigh much...maybe ~5-7# each (ever heft a thermostatically controlled B&M Supercooler?), larger diameter wheels and the associated weight is somewhat offset by less rubber in the tire due to a shorter sidewall, the eLSD and pump may add 10-15# and the slightly larger rotors are probably a couple of pounds. I'm guessing the Z51 package adds 75-80#. I do wonder what the component weight of the MSRC is, as these rag-tested cars all had it.
S.
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St. Jude Donor '13-'14-'15
Team Owner
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From: Springfield MO
Looks as if GM has raised the max cargo(load) from 423 pounds(on the C6) to 525 pounds on the C7. I wonder if that's because younger people weigh more?
Last edited by JoesC5; Sep 27, 2013 at 05:17 PM.
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Brett Foote
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St. Jude Donor '15
"In honor of jpee"
You lost me with the second paragraph.
The Gross weight on the door is what that particular car weighs including the maximum cargo weight. each car's gross weight is different unless you are comparing two identical equipped cars.
I checked with another forum member several years back that had a 2009 Z06 with 2LZ and NAV and chromes. Their car's gross weight was one(1) pound different then my gross weight. I don't know why there was a one pound difference between out two seemingly identical cars, but there was, and GM knew it.
It's not practical for GM to list the exact curb weight of every individual car they build on their website. They can't post on their web site that Joe's Z06 has a curb weight o 3228 pounds but Mary's Z06 has a curb weight of 3227 pounds.
But they can post it on the sticker(that is required by federal law) on the driver's door.
The Gross weight on the door is what that particular car weighs including the maximum cargo weight. each car's gross weight is different unless you are comparing two identical equipped cars.
I checked with another forum member several years back that had a 2009 Z06 with 2LZ and NAV and chromes. Their car's gross weight was one(1) pound different then my gross weight. I don't know why there was a one pound difference between out two seemingly identical cars, but there was, and GM knew it.
It's not practical for GM to list the exact curb weight of every individual car they build on their website. They can't post on their web site that Joe's Z06 has a curb weight o 3228 pounds but Mary's Z06 has a curb weight of 3227 pounds.
But they can post it on the sticker(that is required by federal law) on the driver's door.
It also looks like whatever car/equipment is shown from BillJacobs, it has a curb weight of 3,467 lbs. (3992-525).
Team Owner
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From: Springfield MO
At this point, we do know it's a Z51 car, but that's all, until Bill Jacobs tunes back in with additional info.
Le Mans Master
Joined: May 2010
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From: Ventura CA
It's a Z51 car but I don't know what other options it has. Hopefully Bill Jacobs will shortly tell all the details of that particular car. Gross weight of 3992 pounds minus the max load of 525 pounds, equals a curb weight of 3467 pounds for that particular Z51 car. Not far off(but even heavier) from the 3444 pounds the rags have stated.
Looks as if GM has raised the max cargo(load) from 423 pounds(on the C6) to 525 pounds on the C7. I wonder if that's because younger people weigh more?
Looks as if GM has raised the max cargo(load) from 423 pounds(on the C6) to 525 pounds on the C7. I wonder if that's because younger people weigh more?
Lots of C7's at Burger King!
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St. Jude Donor '13-'14-'15
Using this logic my GT500 weighs 4036# (scaled at 3843# with 1/2 tank of fuel at calibrated scale at track) and my GT-R weighs 3919# (scaled at 3820# with 1/2-2/3 tank of fuel at PBIR). 
Using the GVWR on the door tag is not accurate.
S.
Using the GVWR on the door tag is not accurate.
S.
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From: Springfield MO
And it shows a curb weight of 3467 pounds.
Anther new C7, at another dealer, with Z51 A6 and 3LT shows a curb weight of 3455 pounds.
A third one is 3466 pounds.
Just goes to show you that GM knows the curb weight of each individual car they build.
Weights of cars now showing up show at the dealers show that the 3444 pound weight for the Z51 is pretty accurate, not some magazine's guess. Of course, each car will be slightly different, but GM can't post each and every car's actual curb weight on it's website.
Anther new C7, at another dealer, with Z51 A6 and 3LT shows a curb weight of 3455 pounds.
A third one is 3466 pounds.
Just goes to show you that GM knows the curb weight of each individual car they build.
Weights of cars now showing up show at the dealers show that the 3444 pound weight for the Z51 is pretty accurate, not some magazine's guess. Of course, each car will be slightly different, but GM can't post each and every car's actual curb weight on it's website.
Le Mans Master
Joined: Nov 2005
Posts: 8,213
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So the OP admits they don't ever drag race or road race (AKA Poser). What's the point of this post? The C7 is far superior to your 2009 C6, no matter what the weight. It sounds like another attempt to justify why you should keep your C6.
Even racers who spend a lot of time on the track are not as obsessed by weight as a bunch of individuals on this site. I'm almost ashamed that I contributed anything to another worthless post about weight.
Even racers who spend a lot of time on the track are not as obsessed by weight as a bunch of individuals on this site. I'm almost ashamed that I contributed anything to another worthless post about weight.
Scraping the splitter.
Joined: Jun 2005
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St. Jude Donor '13-'14-'15
And it shows a curb weight of 3467 pounds.
Anther new C7, at another dealer, with Z51 A6 and 3LT shows a curb weight of 3455 pounds.
A third one is 3466 pounds.
Just goes to show you that GM knows the curb weight of each individual car they build.
Weights of cars now showing up show at the dealers show that the 3444 pound weight for the Z51 is pretty accurate, not some magazine's guess. Of course, each car will be slightly different, but GM can't post each and every car's actual curb weight on it's website.
Anther new C7, at another dealer, with Z51 A6 and 3LT shows a curb weight of 3455 pounds.
A third one is 3466 pounds.
Just goes to show you that GM knows the curb weight of each individual car they build.
Weights of cars now showing up show at the dealers show that the 3444 pound weight for the Z51 is pretty accurate, not some magazine's guess. Of course, each car will be slightly different, but GM can't post each and every car's actual curb weight on it's website.
You realize that in order for GM to post actual curb weights (calculated from GVWR sticker), they'd have several hundred different option, model and transmission combos to put on the GVWR stickers. I have a picture of a door tag for a non-Z51 2LT 7-speed car showing 3900#. It doesn't seem to support your case very well when a 3LT automatic Z51 car only weighs 91# more. The automatic alone should weigh that much more than the 7-speed.
And once again, using your logic, my 3843# GT500 (on a calibrated track scale) actually weighs 4036#.
S.
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St. Jude Donor '13-'14-'15