Soooo.....disregarding the DR's you're saying it's pretty much stock?

 

Sorry to hear. If you are in need of a new motor I have a thread with a brand new Forged LSX 427 for sale.



I know. I saw it. I was just being funny...

 

You just reminded me of a very funny post from a while back.

Take a look.

http://forums.corvetteforum.com/perf...a-11-51-a.html

 

Good one!

 

71,000 miles and 250 passes down the 1/4...????

You really got your money's worth out of that engine, we should all be that lucky......

 

Still kind of odd. I'd think that motor (in it's internally stock configuration) would last a lot longer. I've seen vehicles beat to death and still run for seemingly forever.

 

I had a LS7 with a similar failure:


There are 2 exhaust valve heads in that pile of scrape.



Missing cylinder liner and piston



Destroyed cylinder head



Loaded intake before I emptied 2 pounds of debris from inside the intake.

 

I remember you telling us about that case TJ.

Someone had put a cam in it, it had trouble idling and was pig itch according to your description if I recall correctly.


http://forums.corvetteforum.com/c6-z...6-carnage.html

Lot of bad things can happen when we start modding these cars. Yessiree, lot of bad things.

And that Z was definitely modded.

I also remember you saying that you had received that car from another shop in another state, ie the work was done elsewhere, and by someone else.

Looking at the similarities in the pics, bits and pieces blown out of the intake manifold, makes one wonder if the work was done by the same shop.

 

Makes you wonder doesn't it? I can't remember the name of that shop but it was somewhere in the LAX area. Not a known shop to the CF that I know of, I do remember it had a different sort of a name.

 

Pile of unidentifiable engine scrap in the intake before the heads are even taken off FTW! Looking forward to the official entry.

 

You know, I wish hoxxoh the best, but I can't help but think that this car is s 2008, which means that were it stock, and this had happened, the car would still be in the 5yr/100,000 mile powertrain warranty and this would have been a free repair had this mishap occurred.

He has 71,000 miles on it. The warranty would have covered him till 100,000 miles.

As it stands now, he's out the price of the car, and interest if it was financed, out the price of the mods, and out the price of the new engine and labor.

Add all of that together, and the number probably comes in at around what a new Z06 or maybe even a used ZR1 would cost.

At any rate, best wishes with the repairs hoxxoh.

 

HOXXOH has a tune, so the powertrain warranty went out the window long ago. No internal engine mods were on this car, and I think the car is owned outright. He found a new (4K mile) LS3 pullout long block from a 2010 Camaro SS/M6 car, and is performing the R&R himself in the garage.

Here some pic's and video I shot when we "poured" the intake manifold contents onto the garage floor......yep, he gone blown up this one for sure

 

Mark,

A forced mechanical over rev of the engine when his A6 performed a downshift to 1st at 65+ mph is what caused this carnage.

 

Wow, I knew it had to be something other than just drag racing.

 

He would've gotten a lot more miles if the motor didn't experiece a mechanical over rev, which caused the carnage you see.

A6 tranny appears to have allowed a down shift to 1st at the 330'+ mark of a 1/4 pass at WOT....motor goes boom.

 

It happened at Speedworld last weekend...his first pass of the night on the new Hoosier drag radials
He spun off the line, recovered, went back WOT, then at the 330+ foot mark...BOOM. He had enough momentum to make it to the first exit and onto the return road before he came to a rest, so I'm guessing he was at 65+ when the tranny downshifted. Lot's of smoke, but he didn't ventilate the block, and we've yet to pull the pan to see what's in there. I'm guessing there are at least two desentigrated pistons and a broken/bent rod or two. THere is definetly pieces of the block that came out of the intake plenum when we emptied it, so the entire motor is toast

 

Holy exploded metal puke pile batman!!

 

As an honest and responsible person, I fully explained to 2 dealers the mods and the sequence of events surrounding the incident. They both stated that the tune would cause a warranty denial on major engine damage even if the internals were never changed. I suspected that would be the case, but with nothing but minor bolt-ons plus the tune, I had to ask. I have no reservations paying for my playing.

After further review of the events and tune, I recognized some contributing factors.

The event that initially created the problem was just plain stupidity on my part. I consider the first pass of any track day is just to heat the tires, check the track prep, and use the MPH numbers to give an indication of the DA/HP. So a bit of spin only tells me launch conditions.
When I had some spin off the line, I should have aborted the run as I normally do, but I wanted to see the MPH. I got off long enough to hook and then went to WOT again. The trans shifted to ? gear as I let up, but downshifted to 1st instead of 2nd when I got back in it and the engine self-destructed almost immediately thereafter. Considering that I was the driver, I have a better perspective of the speed and track location than a spectator. It happened well before the 330' mark and easily less than 50 MPH, but the visual evidence (smoke) came later.

I've had 3 tunes by others, plus a couple small tweaks by myself. Two of those tunes were done locally on a dyno and other than adjusting the fan settings only changed afr, spark, and TM. The other tune, done on the street by a traveling tuner, made major changes that included lots to the transmission.

When general daily drivability corrections to the transmission were not possible to be done by the traveling tuner, I reverted back to the stock transmission tune and only bumped up the WOT shift points to his previous levels. Since the local dyno tune that replaced the traveling tuner's engine tune never had cause or need to check the rev limiter, it remained at 7150. Nearly 2 years have passed since the traveling tuner set the limiter that high and the only reason I never hit the limiter has been the earlier shift points.

The split second timing combination of wheelspin, backing off, upshift, hooking, WOT, and downshift, never gave enough time to interupt fuel flow at the overly high limiter setting before the weakest part failure happened.

My advice to any other A6 owners who have a tune or intend to get one, especially by a traveling tuner, is to check the rev limiter setting.

When I get the engine torn down completely, I'll try to determine what part broke first.

 

.

When that automatic transmission downshifted into first, at wide open throttle, you didn't have a chance.

Lots of lessons here.

First off, hats off to you Hoxx for manning up and preparing to cover your own damages as opposed to conniving on how to take the car back to stock and erasing the tune to get it fixed under warranty.

Though the tranny was tuned, it wasn't actually the tranny that popped. It was the engine that popped.

Btw, what is the stock rev limiter setting on an LS3? I know that is 7100 on the LS7.

That last tune, which you say involved changes to the tranny too........is the tranny still ok, or do you know?

Sorry this happened hoxxoh.

 

Very sorry to hear about your issue. I hope you get it running again soon.

I see you mention the limiter but from my understanding your limiter is irrelevant in this situation. During a mechanical over-rev it is impossible for the limiter to stop over reving the engine. While your limiter should never been set that high on a stock internals engine, I don't think it would have helped no matter where is was set.

Again, hope you get it sorted quickly!