Z06 vs Viper T/A

[Chrispy]

Originally Posted by SpeedIsLife

It looks like it's the stock ECU tune:

http://www.autoevolution.com/news/20...tup-89790.html

Want full power for your entire lap time? Tune it and blow your warranty to bits.

I bet this is more related to COT (Cat OverTemp) than anything related to the safety of the motor itself. It sounds like the car is keeping excellent IAT1/2 and coolant temps. The engine, trans, diff in this car should be basically indestructible at stock power levels.

[newmoon]

So it will take a tune to unlock the potential of this car for repeated use thus voiding the drivetrain warranty. Not something that buyers want to hear I would guess. I am not a Corvette expert but does the ZR1 suffer from this as well, if not why did GM think there may be a problem with the Z06, was the engine and drivetrain not engineered as well? Maybe Chevy should have kept the Z06 N/A and continued with a supercharged ZR1 offering.

Maybe Medisin can chime in.

[SEVEN-OH JOE]

From the Corvette Z06 Owner's Manual (that thing many people ignore at their peril or potential confusion):

9-17

Follow these recommended
guidelines during the first 2414 km
(1500 mi) of driving this vehicle.
Parts have a break-in period and
performance will be better in the
long run.
For the first 322 km (200 mi):
. To break in new tires, drive at
moderate speeds and avoid hard
cornering for the first 322 km
(200 mi).
. New brake linings also need a
break- in period. Avoid making
hard stops during the first
322 km (200 mi). This is
recommended every time brake
linings are replaced.
For the first 800 km (500 mi):
. Avoid full throttle starts and
abrupt stops.. Do not exceed 4000 rpm.
. Avoid driving at any one
constant speed, fast or slow,
including the use of cruise
control.
. Avoid downshifting to brake or
slow the vehicle when the
engine speed will exceed
4000 rpm.
. Do not let the engine labor.
Never lug the engine. With a
manual transmission, shift to the
next lower gear. This rule
applies at all times, not just
during the break-in period.
For the first 2414 km (1500 mi):
. Do not participate in track
events, sport driving schools,
or similar activities during the
first 2414 km (1500 mi).
. Check engine oil with every
refueling and add if necessary.
Oil and fuel consumption may be
higher than normal during the
first 2414 km (1500 mi).

What was the mileage on the Z06? 700?

Apparently, the "issue" was NOT excessive IATs, but was instead an ECU "safeguard". As not nearly every Z06 will be raced on a track of any description, it appears as though GM has inserted a "nanny" to ward off potential durability issues, as part of the car's 5-year/100,000-mile warranty.

[shaffe]

Originally Posted by SEVEN-OH JOE

From the Corvette Z06 Owner's Manual (that thing many people ignore at their peril or potential confusion):



What was the mileage on the Z06? 700?

Apparently, the "issue" was NOT excessive IATs, but was instead an ECU "safeguard". As not nearly every Z06 will be raced on a track of any description, it appears as though GM has inserted a "nanny" to ward off potential durability issues, as part of the car's 5-year/100,000-mile warranty.

Sounds about right. IIRC I believe the GT500 had something similar until the car reached a certain amount of mileage.

[SEVEN-OH JOE]

BTW, has this issue been raised with any of the 8-Speed Automatics, or is it a 7-Speed-only deal?

[SpeedIsLife]

Originally Posted by SEVEN-OH JOE

BTW, has this issue been raised with any of the 8-Speed Automatics, or is it a 7-Speed-only deal?

My guess is the 7 speeds only so far since the 8 speeds haven't been released yet?

[txferrari]

Originally Posted by SEVEN-OH JOE

From the Corvette Z06 Owner's Manual (that thing many people ignore at their peril or potential confusion):



What was the mileage on the Z06? 700?

Apparently, the "issue" was NOT excessive IATs, but was instead an ECU "safeguard". As not nearly every Z06 will be raced on a track of any description, it appears as though GM has inserted a "nanny" to ward off potential durability issues, as part of the car's 5-year/100,000-mile warranty.

Seems to me that's what it is. At first glance, I looked at it as a problem, but the more I think about it, good move. Besides, We've had 2 tuners tune that bad boy and one got 60hp on just intake and tune. Nuts.

[Doubleblank]

I'm not all that surprised. Corvette has a very slight hp advantage. Viper has at least 150 lbs advantage. I'll give up 10 hp to lose 150lbs.

[hockeylover86]

Originally Posted by shaffe

Sounds about right. IIRC I believe the GT500 had something similar until the car reached a certain amount of mileage.

New GT500 limited full boost until 50 key cycles or 5 continuous miles.

My guess on the ZO6 is that GM found something in late durability testing and modified the tune to protect against whatever it was.

If that's the case, it will be corrected as a running change as soon as a solution is found and tested.

Just a guess.

[hockeylover86]

Originally Posted by txferrari

Seems to me that's what it is. At first glance, I looked at it as a problem, but the more I think about it, good move. Besides, We've had 2 tuners tune that bad boy and one got 60hp on just intake and tune. Nuts.

If GM did tune to protect against something lurking inside the powertrain, we will know once the tuner cars get time on them..

Getting HP via tuning and intake mods is easy, making the powertrain last is the hard part...

If GM did this, do you want to be the first to risk your $90k car to find out?

[txferrari]

Originally Posted by hockeylover86

If GM did tune to protect against something lurking inside the powertrain, we will know once the tuner cars get time on them..

Getting HP via tuning and intake mods is easy, making the powertrain last is the hard part...

If GM did this, do you want to be the first to risk your $90k car to find out?

Well, me personally? No, cus I can't afford to just mess around with a $90k car. But, if I owned a company say...like LMR. I would so.

[rayhawk]

Originally Posted by hockeylover86

If GM did tune to protect against something lurking inside the powertrain, we will know once the tuner cars get time on them..

Getting HP via tuning and intake mods is easy, making the powertrain last is the hard part...

If GM did this, do you want to be the first to risk your $90k car to find out?

The point is that power may be limited prior to a certain threshold or mileage is reached. Sounds like wishful thinking but it is possible.

[hotlap]

Originally Posted by hockeylover86

Getting HP via tuning and intake mods is easy, making the powertrain last is the hard part...?

Offering 426, 505, 580 and 650 HP cars with full warranty on the track or strip is even harder yet. How many car is Ford or Dodge offering such a warranty?

The ZL1 is a conservative tune so its not surprising to read initial reports that the Z06's timing table is also. Can it run a 20 minute track session? Time, not trolls will tell.

...and were does it say the ECU is designed to pull timing during break-in?

[Number 3]

A couple of points:

1 - if this was a Z07 it had the track aero that adds big down force. Which means more drag.

2 - at these speeds, aero means far, far, far more than 150 pounds, give or take.

3 - from a very reliable source, GM puts a "timer" of about 3,000 miles on cars to enable a safer break in. A softer Powertrain calibration if you will. How many people on this site report their cars magically woke up after 3,000 miles? My SS Sedan sure seemed to. And I trust this source without question.

4 - just cuz they say it was two guys just having fun doesn't mean it was.

These are two supercars, one of which is still American (thank the US government for that at least). Both at least built by Americans. And both expected to perform pretty close to each other.

But I also remember the first Z51 vs. Viper comparisons and they picked the Corvette for overall chassis rather than just brute force. So my guess is on a track, all things being equal, there will be a noticeable difference between these two still awesome cars.