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Old 09-15-2011, 03:49 PM   #1
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Power To Weight Ratio

Jalopnik is quoting a power to weight ratio of 7.24 in the article linked below. That seems like a pretty precise number to be a guess. And they attended the press event at Milford. If you multiply 7.24 by 580 hp - I think that's where everyone is getting the 4200 pounds from.

It's interesting that the article also states that the ZL1 was getting Michelin PilotSport Cup tires but that was corrected in an update later on. If the 7.24 power to weight ratio was incorrect - I have to assume that would have been corrected just like the Pilotsport availability was.

What do you guys think?


http://jalopnik.com/5838600/the-chev...u-need-to-know
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Old 09-15-2011, 04:29 PM   #2
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Originally Posted by detspeed View Post
Jalopnik is quoting a power to weight ratio of 7.24 in the article linked below. That seems like a pretty precise number to be a guess. And they attended the press event at Milford. If you multiply 7.24 by 580 hp - I think that's where everyone is getting the 4200 pounds from.

It's interesting that the article also states that the ZL1 was getting Michelin PilotSport Cup tires but that was corrected in an update later on. If the 7.24 power to weight ratio was incorrect - I have to assume that would have been corrected just like the Pilotsport availability was.

What do you guys think?


http://jalopnik.com/5838600/the-chev...u-need-to-know
I think it was exactly the reverse of multiplying 7.24 by 580 to get 4200.

I think the author of the article simply made an estimate of 4200 pounds for the ZL1's weight and then divided it by 580 horsepower to get the weight to power ratio of 7.24137931.
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Old 09-15-2011, 05:27 PM   #3
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It would be nice to at least get an answer from GM on it. Just to stop the debate on what it will weigh.
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Old 09-15-2011, 08:10 PM   #4
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Originally Posted by GoldenBear View Post
I think it was exactly the reverse of multiplying 7.24 by 580 to get 4200.

I think the author of the article simply made an estimate of 4200 pounds for the ZL1's weight and then divided it by 580 horsepower to get the weight to power ratio of 7.24137931.

Very logical deduction, GoldenBear.

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Old 09-16-2011, 12:27 PM   #5
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They can't correct it because they don't know that its incorrect. GM knows what tires it will have. GM doesn't know the final weight because they are still doing a bit of tweaking. Same deal with the performance, fuel economy figures, and pricing.

Think it through ... if the V6 Camaro weighs some 200 lbs less than the comperable CTS, why would the ZL1 weigh about 10 lbs less than CTS-V?
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Old 09-16-2011, 12:32 PM   #6
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They can't correct it because they don't know that its incorrect. GM knows what tires it will have. GM doesn't know the final weight because they are still doing a bit of tweaking. Same deal with the performance, fuel economy figures, and pricing.

Think it through ... if the V6 Camaro weighs some 200 lbs less than the comperable CTS, why would the ZL1 weigh about 10 lbs less than CTS-V?

A reasonable guess isn't impossible.. It's not like anything they'd be doing this late in the game is really going to change the car more than 100-200 pounds, unless they do something like ditch the wheels, change out seats, go to CF body panels, etc...
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Old 09-16-2011, 12:52 PM   #7
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A reasonable guess isn't impossible.. It's not like anything they'd be doing this late in the game is really going to change the car more than 100-200 pounds, unless they do something like ditch the wheels, change out seats, go to CF body panels, etc...
Sure, GM probably knows down to +/- 5 lbs what the final weight is going to be. But they aren't going to come out and say 'your guess is way off, change your article'. Until GM has an official weight to correct it with, they aren't going to do anything.

But the idea that it will be 4200 lbs is absurd to me. I can't think of a way that it is possible, let alone probable. Chances are Jalopnik looked at the CTS-V curb weight, rounded down, & called it a day. The most that I think it can weigh is 4100 lbs, but odds are it will be somewhere between 4000 & 4050 (official prediction: 4027).
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Old 09-16-2011, 12:55 PM   #8
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I guess we'll just have to see..

I weighed in at GLD a week or two back and came in right around 3850 with 3/4 tank and me out of the car.. This is on stock wheel/tire, 2SS/RS/LS3, with TVS2300 + 3.6 pulley, DougThorley LTs + HighFlo cats, stock midpipes, Borla Touring AxleBack, CAI, Inc CAI, RX Catch Can, MSD Wires, NGK Plugs, PFADT SolidSub frame bushings, PFADT Trailing Arms, Hendrixx-Engineering 1400 Axles and secondary fuel pump and lines.. Anything else not listed is stock for the model.

I can't 100% say the scale was fully functional, but others in the modded V6 autos stated they were coming in in the 3700 range..
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Old 09-16-2011, 02:03 PM   #9
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The CTS-V coupe gains 285 lbs over the CTS coupe. So my guess is 4145 maximum for the ZL1 with the M6 transmission, which is 285 lbs over the 2SS. The unknowns are the weights of the added coolers, beefed up powertrain components, and lightened components such as wheels and the hood. It would be very nice if they found some additional ways to save weight, bringing the total closer to 4050 or even 4000 lbs.
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Old 09-16-2011, 02:17 PM   #10
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The CTS-V coupe gains 285 lbs over the CTS coupe. So my guess is 4145 maximum for the ZL1 with the M6 transmission, which is 285 lbs over the 2SS. The unknowns are the weights of the added coolers, beefed up powertrain components, and lightened components such as wheels and the hood. It would be very nice if they found some additional ways to save weight, bringing the total closer to 4050 or even 4000 lbs.
You can't compare the Camaro weight gain to the CTS'. There is no SS equivalent in the CTS line, i.e. bigger brakes, V8, stronger drive train. So that 285 gain shouldn't apply. You should compare the V6 Camaro to the CTS and the ZL1 to the V. If you add 285 lbs. to the V6 you come in at 4035. Add in that the ZL1 uses more weight saving and it SHOULD be right at or just under 4000 lbs. Now the kicker is that 7.24 lb/HP number is said to have come from a slide shown by GM. The only hope I have is that they used the old HP figure of 550. If that's the case it would put the weight at 3982, which would make sense. I hope for the love of god that I'm right and we don't end up with a 4200 lbs. porker. The only disheartening thing is that nobody from GM has said that 4200 lbs. is incorrect. We just get comments like "you might be surprised" and "we haven't announced everything".
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Old 09-16-2011, 02:18 PM   #11
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Quote:
Originally Posted by IOMZL1 View Post
The CTS-V coupe gains 285 lbs over the CTS coupe. So my guess is 4145 maximum for the ZL1 with the M6 transmission, which is 285 lbs over the 2SS. The unknowns are the weights of the added coolers, beefed up powertrain components, and lightened components such as wheels and the hood. It would be very nice if they found some additional ways to save weight, bringing the total closer to 4050 or even 4000 lbs.
Why are you comparing the weight of the SS & the V6 CTS?
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Old 09-16-2011, 02:28 PM   #12
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Quote:
Originally Posted by detspeed View Post
Jalopnik is quoting a power to weight ratio of 7.24 in the article linked below. That seems like a pretty precise number to be a guess. And they attended the press event at Milford. If you multiply 7.24 by 580 hp - I think that's where everyone is getting the 4200 pounds from.

It's interesting that the article also states that the ZL1 was getting Michelin PilotSport Cup tires but that was corrected in an update later on. If the 7.24 power to weight ratio was incorrect - I have to assume that would have been corrected just like the Pilotsport availability was.

What do you guys think?


http://jalopnik.com/5838600/the-chev...u-need-to-know
They are pretty precise numbers to just put out there but I agree with the others. They just started from a guessed and rounded number and figured backward.

Quote:
Originally Posted by GoldenBear View Post
I think it was exactly the reverse of multiplying 7.24 by 580 to get 4200.

I think the author of the article simply made an estimate of 4200 pounds for the ZL1's weight and then divided it by 580 horsepower to get the weight to power ratio of 7.24137931.


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Originally Posted by HumanWiki View Post
It would be nice to at least get an answer from GM on it. Just to stop the debate on what it will weigh.
After the 'Leaked' info that we got early in the 5th Gens building and the subsequent GM flaming that happened, I doubt they are going to 'leak' any more info to us about specifics. As a whole, we took some of the info they gave us and created a big fat drama fest with some of them.
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Old 09-16-2011, 02:30 PM   #13
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This is interesting; + / - a 100 lbs. or so really doesn't matter, does it? The ZL1 is still the baddest in the land plus the addition of a smaller pulley, headers, etc. will push this car's performance beyond wet dreams of just a few years ago. The technology in this vehicle is astounding and we'll have to wait to see what this will cost us. Chevrolet has to stay competative with the high end mustang to be successful though. Personally, I can't wait......
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Old 09-16-2011, 02:33 PM   #14
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Why are you comparing the weight of the SS & the V6 CTS?
Yep. My Bad. Didn't realize it was only a V6. ZR1 gains 158lbs over Z06, which I would say is a bare minimum weight gain given all the measure they went through to keep that a light weight car. So my new guess is somewhere in between 4018 (158 over SS) and 4065 (285 over V6).
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