Not really much of a legal “in” either.
From the actual warranty
.
https://www.chevrolet.com/content/dam/chevrolet/na/us/english/index/owners/warranty/02-pdfs/19_CHEV_WM_.pdf

 

If you are at all concerned perhaps you know an attorney and can gain his/her thoughts. With product warranties you would see much different language and it would be in numerous different locations if there was an intention of denying a future claim.

 

I’m not that concerned, I just waited till 1500 miles. It’s just launch control.

 

I waited until 890 miles. Very first launch broke the transmission. I'm going to put 1500 miles on the new transmission before I try it again. But your friend is right...it was the most fun 15 feet I have had in a car before it broke!!

 

Yikes, this sucks.
I'll wait until 1500 miles. Not because of the above post, but just to be extra careful.
If it blew up at 890 miles, I can't imaging another 610 would magically do the trick.

 

Riot?

 

If only you’d have waited to 1500 miles, you would have had the most fun 26 feet

 

Sorry to hear that - any problems getting the warrantee coverage for the new transmission?

 

I toured the plant as well. In fact had a private full tour with my Director of National Accounts! It was he or me that would start the car at the end of the line! Since I had a Corvette picked myself! I was the one who started it for the first time when it was ready to come off the line. NFW do they run it anywhere max power! Sure part of the test includes running it through the gears, can see that on a number of video's. I was answering the statement that it isn't stressed more in Launch Mode than experienced at the factory!! That is BS.

SIDEBAR (The highest stressed Engine part are Valve springs. Worse at High RPM)
This is the reason when I was breaking in my engine I was carful to have the valve springs treated very carefully for 500 miles. As would GM! Especially as my September 2020 C8 was in a time span when some valves were breaking usually under 500 miles. They are the most highly stressed engine part AND at high rpm the harmonics cause increased loads.

Quoting: The valve spring is the most highly stressed engine part. Just how much torture are we looking at? To put things in perspective, Lunati manufactures high-tech connecting rods with a 250,000-psi tensile strength. The rod "rarely sees even 50,000 psi of stress under real-world operating conditions" (20 percent of its rated load, or a 4:1 safety margin). But it's common for a valve spring to continually operate at half or slightly more than half of its rated load. "A spring that's rated at 300,000 psi routinely will see loads approaching 150,000 to 190,000 psi every cycle. Nothing else in the motor continuously runs at 50 percent of its ultimate strength—and it needs to do that, in long-distance racing, for millions of cycles." That's not even a 2:1 safety margin—so, yes, valve springs really do operate right on the edge in a high-end motor!

Break-in New Valve Springs: It’s important for new valve springs to be broken in properly. Upon initial start-up limit the rpm to 1500 to 2000 rpm until operating temps are reached, Then shut off the engine and allows to cool to room temperature. This will usually eliminate early breakage and prolong spring life.

Note the Extra Spring Movement as RPM Increases. Causes Higher Stress

 

How do you figure that? This isn't a handmade Italian supercar that gets driven on the track before delivery.

 

They are not fragile in the least, your problem would have occurred whenever, but break-in had nothing to do with it. It's not like it's made out of marshmallow cream and at 1,500 miles it turns into case hardened steel.

 

Thanks to all for the information..I waited 8 months to get this baby and I plan on keeping this girl a long time...so with all that I thing I can wait another 600 miles...Gives me something to look forward and find a place to do this and not get a ticket
It always amazes me at the responses....Lots of knowledge here...

 

Picked mine up a week ago and have decided to wait to get to 1500 before launch mode. Once it hits 500 miles, I'll for sure floor it a few times for thrills. But won't do an actual launch.

It's my DD and I intend to keep it for a long time. So what's another 900 miles if it could possibly, theoretically, even just a hair of a chance, help with the longevity of the transmission?

 

I'm in the "If that's what they meant thats what they would have said" crowd. There's a lot more to tracking a car than launch control.

I read every one of these threads and this has been debated by owners for years now. Why isnt there a definative answer from Chevy?!

 

To add my two cents, I'm more in the "break it while it's under warranty" category. Otherwise, you're just creating an expense down the road after three years of keeping the car tucked away in the garage aside from a few leisurely parade laps during lunch.

And yeah, I agree, debated for years. In the end, it's just a car. I'll likely take it to the automatic car wash if it's too cold to wash it in the driveway anyway.

 

I'm hoping I will be out driving so far and often 1500 miles will fly by in a couple weeks! When I got my first street bike I was out riding 600+ miles every weekend... Time to dust off the old back road routes!

 

I guess I'd better not try this for the first time on an open road in the middle of the desert. It's tough finding an appropriate runway in the city.

 

I always fine that "debate" funny! It's only those who have no understanding of the small hot spots created by metals wearing in during break-in including precisely machined gears! The parts have microscopic high spots that can get very hot in the process! That's why high performance differential suppliers like the Currie 9" Ford dif I have in my ProStreet Rod recommends a 500 mile break-in with no heavy loads and limited initial runs to keep the lubrication cool..

Also the very high stresses very high tensile strength valve spring wire (for perspective, it can can exceed 250,000 psi while the steel in the bridge can be less than 50,000 psi) as all metals, has microscopic defects that can grow into cracks. Proper break-in at limited rpm can have those microscopic discontinuities blunt at the ends (like drilling a hole at the end of a sharp crack.)

Yep with proper cylinder honing and finishing racing engines can be broken-in on a dyno (no trans/dif gears to worry about) with some initial lower rpm runs and the oil/all parts up to temperature and with their thin lower friction rings high rpm break-in might provide slight extra power. BUT big difference in a racing engine and road engine, re finishes such as cylinder homing for power versus life. Also remember when we sponsored Richard Petty for >15 years (our folks were supplying welding training in addition to welding and cutting machines.) Being a gearhead I would go with them and talk with his crew chief, Dale Inman. Great fun guy. Recall I was asking about the oil used. He mentioned it was like a very light weight to reduce friction and gain hp. I asked it that heavy enough to protect the engine. He said for the 500 miles we need!

PS: Can't expect GM to say all the things you shouldn't do i.e. not launch mode for XXX or no jumping your car or doing NASCAR winner sustained Donuts to protect the DCT! Nope can't advise on all stupid things folks could do!

In fact the "ONLY" thing I have seen quoted by a GM rep as "WHY" add an extra 2 quarts of DCT fluid for Tracking was a spokesman giving a talk at a Carlisle Evet who said it's because if Tracking going downhill and turning the fluid can go to the top of the case! Guess, if that was the issue they could have also said no "Jumping Your C8!" It was also said by a Youtuber it was done because GM found someone doing foolish NASCAR Winner Sustained Donuts!

 

It would not have taken ANY effort or space in the owners manual to say "no launch control starts" under the 1,500 mile part. It says "no wide open throttle starts" in the 500 mile section. Launch control IS a wide open throttle start. It also says non Z51 cars are never to be used at a track. So since you are only supposed to use launch control at a track, non Z51 cars have launch control, but are never allowed to use it. They control your speed and limit it to 26 mph if the frunk is popped, but they don't remove launch control on cars that are never supposed to use it????????

 

In theory all non sports cars should be speed limited to 80 mph since they’re on public roads. We don’t want them to take this too seriously.