what is the weight of the C5 Z06?

I know they used the fixed roof coupe for the Zo6 because it was lighter than the targa top car.

Anthoer factor to ponder is that the C5 Zo6 was under-rated and made more than the claimed 405 hp. While maybe this new C6 is right on the money with the 400 hp rating.

Either way, 12.88 is a good time for a stock car, but just not very good for a 400 hp car weighing about 3179lbs. A 2.15 60' time is also horrid considering I got a 2.0 60' time with 245/50/R16 Sumitiomo(sears brand) tires with 1/4 tread left.

The Mustang Cobra runs a similar time, and it weighs 3665 lbs. And it is rated at 390 HP.(might be underrated too)

 

I haven't been impressed with the numbers I've seen from stock C6's either quite honestly. I've seen some dyno graphs and wideband tests that indicate the LS2 is pretty poorly tuned from the factory as well.

 

Could this be on purpose

 

you are way off.

granted, you have to have suspension movement to have weight transfer, but looser suspension will allow the weight to be transfered easier. and faster.

 

#1 I never, ever said suspension movement *causes* weight transfer. No where. The opposite is true. Clearly here I am talking about the case where accelaration causes weight transfer which is allowed by movement of suspension pieces.

#2 Re-read my post. Where exactly in there did I say *rear* suspension stiffness? Again, no where.

#3 Yay... I was referring to front suspension. If you understood basic RWD drag racing tech at all (I'm no expert but I know enough basics) you would know that drag racers will often run softer shocks and springs up front. The fact is you want the front of the car to come momentarily up at launch (not too much obviously or it becomes detrimental and I don't mean pulling wheel stands in street car), because this changes the effective center of gravity relative to the rear axle, i.e. biaising it somewhat towards the rear wheels where it will cause the tires to bite harder.

And no you do not want massive rear-end squat - you are correct, but I sure never said anything about it being desirable to induce excessive rear end squat.

Special (rear-shocks and springs) are often employed to complement the drag front suspension setup because of the way the front supension loads and unloads. And further complicating things is the way that leaf spring suspensions (like the C5 and C6) behave differently from coil-over type suspensions. But I don't pretend to understand the details in how the dynamics work.

Also from from the nhra website:

http://www.nhra.com/basics/glossary.html

"Weight transfer: critical to traction. Vehicles are set up to provide a desired weight transfer to the rear wheels. Upon acceleration, the front wheels lift and the weight shifts to the rear wheels, which makes them less likely to spin."

Thousands of drag racers can't be wrong.

 

What a bastage....
What does a Z06 run with a 150 shot?

 

Weight transfer is going to happen whether the suspension “allows” it or not. Explain to me how, exactly, does a soft spring (on either end of the car) “allow” more weight to be transferred? A soft spring may look like it’s transferring more weight because it’s allowing the body to move more, but it’s only allowing more movement because it’s softer.

Here’s an analogy. Put two coil springs of differing stiffness but identical weights on top of your bathroom scales. Now stand on each one. You will compress the softer one more. But the scale will not register more weight.

It’s the same when two otherwise identical cars are sprung differently. The softer sprung car may look like it’s transferring more weight because its suspension moves more, but it doesn’t. It’d be interesting to put some scales underneath each rear coil spring (not on a Vette, obviously) and see what weight is actually being put onto the axle.
Sorry, I made an assumption. But a spring works the same whether it's being compressed or expanded.
Just how far backwards do you think the Cg is going to move as a result of the body moving through its suspension travel? Maybe a ½” towards the rear? What’s that worth, 5-10 pounds? Actually, you get more effect because of the Cg moving upwards, not backwards. So to the small degree that the Cg changes, yes more weight is put on the rear axle.
So all that says is that weight transfer is good, and when it happens, the front end lifts. No argument there. Does it say soft springs are necessary for this, or even how that might work?
What kind of spring rates are top fuel and funny cars running?

 

R377, you are way confused. if suspension didn't help weight transfer. why would people do it? you say you're not into drag racing, and it shows.

what a top fuel dragster does doesn't mean it's good for a passenger vehicle.

 

None of that matters really, I just noticed the trap speed's dont exactly come up to what a low to mid 12 second car should have. Is it just a tuning issue?

 

Not that I can offer up a track time, but judging by the one I raced from a press the other day (posted it up in kill stories with a small picture), all this talk of high 12 low 13 is way off base and you shouldnt have to worry about it.

The C6 I ran into was faster than Z06s I've run into, I'd say it was atleast mid 12 or better, just give it a good driver please. The C6 made me work for my win, which I think is for a completely stock car that easily passes emissions, gets good gas mileage and comes with all the creature comforts.

 

It has to be all driver. A friend of mine took his 04 Z06 to the track for the first time and all he could get out of it was a 13.12. The second time he pulled a 12.92 and still wasn't happy. I told him that was pretty good time and he said he knew the car had more in it. We went back a 3rd time and he pulled a 12.23 and it's stock. It was all about learning how to drive it and I think it's probably the same thing with the c6's.