Cjunkie

Does anyone really think there will be a significant performance difference between the two? I'm talking 1/4mi and lap times.

Foosh

No significant difference, if anything the GS will be a "tick" slower due to the added weight and drag of the wide-body.

tunaman

1/4 mile times should be a bit slower in the GS, just as they were with the C6. Track lap times will likely be lower with the GS, also as with the C6, depending on the driver. Especially for those who opt for the Z07 package - it will be noticeable for sure.

Cjunkie

Kinda what I was thinking.

JerryU

Hmmm, would think it would be a bit faster in the 1/4! 0 to 60 times are reported to be faster (0.1 to 0.2, will need a side to side comparison) due to the wider rear tires. Off the line traction is the limiting factor on take-off acceleration. The improved 60 foot times should offset the extra weight.

Bench racing is fun but real world data is the only way to find out.

Foosh

Yes, "reported" by GM, but that's likely just marketing hype. They have to find something advantageous to say about it other than just looks. I suppose it is possible that the extra traction could overcome the weight and drag penalty.

However, I think the safe bet is that the cars will be essentially equal, and the outcome will be entirely dependent upon the driver.

JerryU

The extra drag is a significant issue at 150 mph, but the majority of the quarter is well below the ~115 mph trap speed so with the stickier cup tires even the highest aero package might still give faster 1/4 mile speeds!

As you say need a side by side comparison, GM numbers will certainly favor the newest model. Considering the variability, why shouldn't they publish the best they obtain! They no doubt did the same with the base car.

As I said bench racing is fun but not definitive!

vetteLT193

Wider, stickier, tires is the first thing a drag racer does to get more speed. The GS will be faster in the quarter because of tires.

mitchydkid

GS is only 25lbs. Heavier than a Z51 equiped car. I would think the better traction of the wider tires would more than compensate for such a small weight gain.

On the 1/4 mile track I would expect it to come down to driver.
On the road track I would expect the GS to be substantially faster with an equal driver because that aero drag that is there won't hurt in the corners. The bigger brakes should allow for better entry into those corners too.

Lots of Z51 owners would like to think the GS is just a Z51 with a drag and weight penalty, but I doubt that is accurate.

2cnd Chance

If you add the Z07 package to the GS you lose around 40 Lbs. so then is lighter than a Z51. The GS wide-body will have very little drag effect over a Z51.

dvilin

The difference will be in the drivers skill level.

2cnd Chance

^As with most any racing.

JoesC5

Probably more like 20-25 pounds savings. The carbon ceramic rotors will be lighter per corner vs the iron rotors, but the larger CCB calipers weigh more than the smaller calipers used on the iron rotor cars, offsetting some of the weight savings from the rotors.

JoesC5

We're comparing cars(GS and Z51) not drivers. To compare different cars, you use drivers with identical skills (or the same driver). If you are comparing drivers then you use identical cars(or the same car) with different drivers.

2cnd Chance

"All numbers below are per corner*

CCM
OEM front Caliper= 10.4 lbs
OEM front CCM Disc=13.4 lbs.
OEM front pads= 6.2lbs
Total OEM CCM front corner brake weight= 30.0 lbs.

VS

Iron
OEM front caliper= 10.4 lbs.
OEM front iron disc/hat= 23.8 lbs.
OEM front pads: 6.2lbs
Total OEM Iron front corner brake weight= 40.4 lbs.

JRitt@essex"

JoesC5

Where did you get those numbers?

They don't jive with the weights on the CCB's used on the C6 Z07 and ZR1.

On the C6 CCB's the caliper weight was higher on the CCB cars than on the iron brake cars.

2cnd Chance

It was a quote from JRitt@Essex (they weighed everything to compare to their brakes), as I copied it. You and I had this same exact discussion many weeks ago, which is where I took this information from.

JoesC5

Do you have any other sources such as owners or shops that have weighed the C7's brake components.

I question the numbers you provided because the ZR1 has the same diameter front carbon ceramic rotors that weigh 16.2 pounds where the numbers you provided show the C7 carbon ceramic rotors weigh 13.4 pounds.

Also the ZR1 front calipers weigh 16.12 pounds and the number you provided show the C7's caliper weighs just 10.4 pounds.

The ZR1 numbers are from shops that weighed the items and posted them on the C6 Z06 section.

https://www.corvetteforum.com/forums...ight-list.html

Always Red Dave

I read that the Z07 package is not available on the C7 GS.

jagamajajaran

It's definitely available.