Steve Snake Driver

Vengence Racing

21STCENTURYMUSCLECAR

1st pull at 170 degrees coolant 568 rwhp
3rd pull without cool down/203 degrees coolant 549 rwhp

Not suprising and definitely not just a C7 Z06 issue as most every supercharged car and most NA GM cars lose 2-5% est. after 3 back to back dyno pulls

rocknroller

Huh? Sounds like a lot of good, calm discussion going on in this thread. Most are in wait and see mode and have stated that.

3 Z06ZR1

Owning a Z06 does not make "one an expert"!
Are the stories not true? Here's the chance for the "actual owners" to speak up! Let's run your Z06 with my ZR1 for some three honk action! I hear tons of people opinion's on those too and they never been in one.

I figure if I just get a mint shape used Turbo S the ***** contest is over.
(I like to buy used more car for the dollar) Those cars come out hard then manage to out run about anything!

Ultimate Z06

Calmer discussion than many threads. I too appreciate the rational discussion.

3 Z06ZR1

I tend to see the 568 as the closer to the real number.
The 595 number we saw is one happy dyno.
So the rest of the numbers are too!
then after 3 pulls it's ZR1 numbers with C7's the extra weigh and
drag.

3 Z06ZR1

I see them fixing it on a 2016 "IF" they fix anything.
This years car. No.

JoesC5

I was under the impression that the "normal" coolant temp on the street was 220 degrees on the C7.

How does doing dyno pulls at 170 degrees and 203 degrees reflect the horsepower when doing real world driving(or doing multiple pulls on the highway) with the coolant running 220+?

My 2009 Z06 runs 192, right on the thermostat's setting. I seem to remember that the PCM doesn't start pulling timing until the coolant temp reaches 213 degrees

At what coolant temp does the C7 Z06 start pulling timing?

JoesC5

Yep. The typical 12% driveline loss found on C5/6/7's with manual transmissions would give you 572HP at the wheels. So far we've seen a 572 pull, a 573 pull, a 568 pull and one "happy" 585 pull. I wonder who's the odd man in those pulls?

ZR1 with 12% driveline loss is 561HP and that is reflective of what they dyno. Not the 530HP that the same shop that posted the 585HP for the C7 Z06.

dvandentop

If they do change a tune on the 2016. The previous year should be allowed to flash it with no warranty implications imho.

JoesC5

Derek,

What was the coolant temp running on your drive home from Springfield?

dar02081961

Not exactly. The hp numbers may end up near the ZR1. But what you failed to acknowledge is they also said this is typical of all "supercharged cars". Therefore the figure you refer to for the ZR1 would be diminished as well.

Regardless using the diminished Z06 numbers compared to the 561 number for the ZR1 you are still missing about 50ftlb of tq in the ZR1. Which will more than offset the weight penalty for the Z06.

These cars should perform roughly the same with the Z06 being slightly quicker out of the whole or corners because of its tq advantage. Once at higher RPMs the cars are nearly identical and should hold position. This is if you believe only the Z06 loses power. If you believe they both lose power then the nod certainly goes to the Z06.

Northern33

It's all purely preference. It's like asking what the best colour is.

I currently own a 2014 911 C4S, but have a Z06 on order. I spent 5 days recently at the Springmountain Motorports park driving the C7's. The experience was impressive enough to go down the road in getting a C7 Z06, but they are very different cars.

Porsche makes an incredibly well built, ergonomically correct fun car to drive! I constantly find excuses to drive the car. The PDK transmission far exceeds my expectations. It is a smooth and deceptively fast car considering it only has 400HP. The grip will put a smile on your face every time you have a chance to test it. That being said; they are not cheap! Every option is overpriced.

The reason I decided on the Z06 was the amount of fun it is per $$ based on the fun I had tracking a C7 in September. The plan is to keep the Porsche when the Z06 eventually arrives. I can see the Porsche being the car for longer trips...

Good luck in your decision. They are both great cars, you cannot lose either way!

Foxer55

Possibly but I think they may ignore it. They have the 80% solution with this car and may not go for the 100% solution.

Dag Skagney

The plan is to keep the Porsche when the Z06 eventually arrives.

That's what I'm talkin bout....One of each...................

SBC_and_a_stick

A C6 Grand Sport is for sure less than 80% of a C6 Z06. That didn't bother you before. A C6 Z06 is only 80% of a C7 Z06.

Why does it bother you now that the C7 Z06 has only 99% of its cold weather performance when hot?

Skullbussa

This is an absurd argument. I don't think Foxer55 would expect to get 100% of the performance in the snow either.

There is no precedent for a car so heavily marketed as having x amount of hp and y amount of torque that can only deliver that power for short bursts of time.

GM will fix this, I have faith in them. But burying your head in the sand and making ridiculous excuses for what is happening now does NOBODY any service.

Greg Quillen

Temps when they were testing the A8 trans..

SBC_and_a_stick

100% of the performance of the engine? Without getting into continuous distribution discussions and the probability of a discrete event, yes, why not? Listen to what you are saying.

You concluded the Z06 is broken now? Show me your evidence. I just think you have nothing to show for your claims. Do you expect GM to recall a vehicle because one journalist found a small fault with it and nobody was able to replicate it?

When you hear a squeak and you take your car to the dealer, do they fix it without replicating the squeak?

Show me the Z06 is broken. You have no concrete evidence.

dvandentop

sorry dont recall