ChrisUlrich

I did a few searches, but had a hard time finding an exact answer!

C6 Coupe vs C6Z

Doesn't really matter the years due to the applications i'm about to mention.

Here are the hypothetical setups!

Boosted, cam only 730whp C6 Coupe M6
vs
Boosted, heads/cam/intake C6Z

Both have stock transmission and gearing. Both running the same supercharger.

Let's also create another situation where power is roughly the same. Around 680whp. Can we also assume that traction is the same? Both running a good tire.

I would think the C6Z would be faster, right? But by how much?

jaredtxrx

LS2 or LS3 coupe?
Z06 is roughly 50lbs lighter than an LS3 car and has room for more tire.

BUT you say the Coupe has 730whp and then "Both around 680whp"
Power being equal Z06 in perfect conditions with same driver.

In a 1/4 mile drag race I'm guessing maybe a 1/10th or two, but you don't specify what type of race. On a road course the Z06 would take care of the base coupe without an issue assuming same driver same conditions.

ForceFedC4

Differences in drivers vary greatly, even if all other factors were similar. Work on your shift game and you might win, hypothetically. I think the base and the Z06 use the same gearing, somebody correct me if I'm wrong. It's a close ratio 6 speed, now the Z51 option I'm pretty sure has a wide ratio gearset which would could make a difference in the outcome.

ChrisUlrich

Jared, you're so right. I'm sorry! I fixed it!

Realistically, the race would be from a roll. 40-60 somewhere to start. Probably stop at the top of 4th. Can go into 5th, maybe... most likely.

Suns_PSD

Pretty silly hypothetical situation for man reasons.

You start at the "top of 4th" and I'll downshift to 2nd and beat you by 100 yard with 480 rwhp.

And no one should be adding a supercharger to an LS7.

HOXXOH

Roll races are street dynos, assuming traction is sufficient. The variables are gearing and aerodynamics. If the race is long enough and the power is equal, the car with the best aero will always win. If the power is equal on a short race, the car with the shortest gearing will win.

ChrisUlrich

Huh? I didn't say start at the top of 4th. hahahaha I said stop!

EDIT: if I start at the top of 4th, i'll be doing 148mph already. hahahahaha

jaredtxrx

I'll go with the lighter and wider tires of the Z06. At 40mph there are going to be traction issues. At 60mph then they would be pretty close until possibly the coupe taking over at the top end due to the narrow body and less aerodynamic drag (if the coupe is a Z51 it muddies the waters a little because of the longer gears and having to shift at a higher speed means it could lose more ground during the shift than the Z06 and have a some of that depends on what the engines power band looks like etc...) But this is all hypothetical bench racing and sounds like two guys puffing their feathers up during a car meet.

LMB-Z

Same hp, same driver, even race.

ChrisUlrich

It's actually a friends car. His car fairs pretty well on the street. Wondering how i'm going to size up.

My car isn't done yet so this thread is me trying to uncork a bit of excitement.

Good guess though

ArmchairArchitect

"Faster" all-around on a track, or are you talking only drag racing (not the best measure of a car's performance)?

Z06 is a more rigid and better handling car/better brakes so with equal power, it will be faster around a track.

5knives

We know one car is making 730rwhp. Can I assume the projected results for your build will be 680rwhp? How do you plan on making up the 50rwhp difference? You can't just say both cars are making 680rwhp to fit the hypothetical scenario. If it's making 730, it's making 730. Going from a 40-60mph roll takes the launch out of it, where most races are won and lost, so that extra 50rwhp could play a factor. All things being equal, things are never equal. When your car is complete, lay your dynograph over your friend's. I'd be curious to see the power curve between the 2 cars. That will give you some incite.

ChrisUlrich

The Z06 makes 680. My car "should" be making 725whp or so. It's not done yet so everything is hypothetical. Just paper racing for now because it's fun to talk about (for me!).

The hypothetical situation was created to see what car is faster is a straight line from a roll. Removing most of potential driver related issues. Shifting gears does matter, obviously. But a launch is far from important.

The reason this thread was made is because I was told a 680whp Z should be a very close race with my 730whp 08' Coupe. Even though i'll have the 50whp advantage. So I came here to see what others think and have seen.

Unreal

Peak power is only one thing. My 427 makes 100ftlbs more at 6k rpm and lower than two friends boosted 376s. Peak power almost identical. So same power of same peak power?

5knives

Depending on the year of each car, the Z could be anywhere from 100-150lbs lighter. Weight matters a little less at speed and your extra 50hp evens things up a little more. Is yours a Z51? As others have mentioned, gearing and aerodynamics could play a roll. The faster you go the more of an advantage the narrow bodied base has but not if it requires an extra shift when the Z doesn't? So it also depends on what speed you plan on shutting it down. Again, I'd like to see dynographs of each car but it's really going to come down to the driver. Do 3 runs each then switch cars and do another 3. Neither should be embarrassed about losing to the other though.

​​​

JJLAI724

Is this one of those "Mines is better than yours threads?"

j/k....I'll vote for the Z06 since it's lighter.

Ahrmike

While this is true, from a roll, for a GS/Z51 package, power from roughly power from 3900 and up is the only thing that matters since if you downshift properly, you will NEVER fall below that rpm.

Ahrmike

I would take a look at the gear calculator and see what the best speed to do a roll race is:

For my GS, a 60-roll is terrible. I'd be out of my powerband in 3rd and I'd have 1K rpm in 2nd before I have to shift.

Doing a 50roll/70roll would be much more advantageous to my gearing.

ChrisUlrich

It's a non Z51 car! 08' Coupe!

Ahrmike

http://www.pszweb.com/car/gears.htm

http://www.corvettemuseum.org/learn/...orvette-specs/

Shows that you are right below 60 at the end of 1st gear. The Z06, since it has the same gearing as your car (first gear is longer though, due to higher revs); will be a little over 60 in first.


Actually, since you two have identical gear ratios this doesnt help you much at the same power level. Plus, he shifts less if youre doing a 60-90 roll. If you do a 70-100 you might be taking advantage of your gearing. (well, not really an advantage- he has to shift twice, you have to shift twice.)