427Z

looking at dyno graphs of a 02 Z06 against a C6 and running a differential equation to get both areas under the curve and subtracting one from the other, the C6 yields ~ 3% more power from 2k-rpm to 6.2k-rpm. the Z06 makes same or marginally better (+/-4hp) power in only the last 2-300 rpm range.


this means in a race, assuming both cars are in their power band from 4-6.5k rpm, the C6 is making more power to the wheels 85% of the time.

this being the case, why is the C6 putting C5 times or slightly better in 0 to 60 and the 1/4 mile but far short of the Z. and this same data is repeated from six or seven mag tests. at most there is a 200 lb difference between the C6 and Z06 but given the better power of the LS2, id think that the 200lbs would be negated and performance should be about same as Z.

Dave Hill stated that given the performance difference between a base C5 and the C5 Z06, the C6 is 75% closer to the Z06 performance. but from all the tests so far on the C6, it seems to be splitting the performance difference between C5 and Z06 being about 25% ABOVE C5 stats.

can anyone comment. and please, no BS C5/C6 bashing either way, thanx

Jason

Weight plus gearing would be my guess.

mikeyc6

An excellent question and one that I've been pondering myself for a week or so! I didn't think there was more than a 50 pound difference between any C5/C6 model if you exclude the convertible, but IF the C5 Z06 is 200 pounds lighter, that is a 6% difference in weight which, even with the 3% increase in power of the C6, would still give the C5 Z06 a 3% advantage due to weight.

I don't think gearing is an issue if you have a C6 Z51 because the gearing on the C6 Z51 is the same as the C5 Z06. Does anyone have the "official" weights of the C5, C5 Z06, C6, and C6 Z51 cars?

Mike

bowtie_bias

Weight , ZO6 contact patch is a little bigger, and combine that with the FE4 vs. the Z51 .
The ZO6 handles a little better , and in racing staying on the pavement over a two mile course can translate into "tenths" . You've got a suspension that won't bottom out vs one that might , even though its very frim .You're traveling over kerbing , taking lateral G's . This adds up . ZO6 is designed to be a racecar .

Lazerwolfe

I'll say it's too early to make that statement. Too many conflicting times from car mags.

Jason

The more I read that, the funnier it gets.

Lazerwolfe

Are you imagining Professor Frink saying it?

Jason

I mean damn, I'm an engineer, but....damn.

bowtie_bias

When I read his opening statement it took me a couple of seconds to realize what he did . LOL
He solved for the area under both curves and got the difference between them . Dude , you lookin to work for Williams F1 or something , hehehe ?

Sandy S

The larger rear wheel diameter should have some effect also.

Sandy S

Also if it does weight 200 lbs more then you need about 26 more hp to keep the same lb to hp ratio. I think the Z06 is about 7.69 lbs/hp.

Jason

I can't believe I'm actually going to enter this arguement.
But we are talking about a matter of tenths. Especially with 0-60 times. Tire pressure. Tire compounds. Tire temperature. Outside air temp. Relative humidity. Head winds. Tail winds. Cross winds. SKILL OF DRIVER. Dumb luck. Auto vs. manual. Age of clutch. Temp of clutch. Age of motor. Top in. Top out. Windows up. Windows down. Weight of driver. The variables are endless. All of these taken individually, much less any of them combined, can easily account for tenths of a second. That's why we race. Even bone stock cars. Race'em and find out who's faster today. On this pass. Until the next pass.

bowtie_bias

I'll agree with that when Z51 C6's consistantly take the ZO6 at the track . So far , test after test . this ain't happening . The ZO6 is consistantly winning in
documented head to head comps . If i get a-hundreth at this interval , and a minus at the next , and the next , Well guess what . They add up . There is a clear and MECHANICAL difference between the ZO6 and the Z51 C6 , stock vs stock . And if ya ask
Dave "money" Hill , he'll tell ya .

Lazerwolfe

What documented head to head comps are you referring to?

Jason

I'd bet after 10k miles the C6's will be faster. I know most C5s were.

Mike Mercury

Hmmm... he's got a point here.

pitrider

bowtie_bias

GM's own tests and EVERY MAG that has tested both cars head to head . Dave Hill himself says the ZO6 is faster . Prove me wrong ..................................

jschindler

Some folks are overreacting big time.

Consider C&D. They ran it at 12.7 @ 113. In the same article they say that they averaged 13.3 @ 108 in all the C5's they tested. That is a significant difference. Also, remember that the forum members who have posted times have been running on engines not broken in, and in the heat of summer.

Jason

The C6 was never intended to beat the Z was it? I'm lost.