This so called tuner from what I was told put 45 degrees of timing all across the table.
Yes I said 45 degrees with a lean PE table. He has no Dyno & told my friend Them guys that tune on a Dyno don't know what there doing.

Now this car was fine before said tuner worked on it. When he tuned it the first time while my friend was in the car he blew the head gasket.

Now this car was done 2 years ago 25000 + miles Then after head gaskets were replaced.
The piston goes BUT that had nothing to do with the 45 degrees of timing.

Only lesson here is that just because you buy edit software it does not make you a tuner.
The car is back at the tuner that built it the first time & it will be better then ever.

 

By chance was it the #7 cylinder?

 

Thats a whole lotta timing. Looks like it detonated, broke a ring land, and then hammered the broken piece around. How does the combustion chamber look?

 

45 degs of timing Yeah, he new what he was doing..

 

and the funny thing is that ANYONE who knows ANYTHING about tunign the LS1 knows they dont need or even like a lot of timing. In my experiences the ls1 mtor doesnt make any more power w/ anything over 27 deg of timing in higher cylinder volumes. IN fact the ls6 has like 21-22 deg of total timing in higher cylinder air volumes if i recall.


Dave

 

My stock LS6 heads like 20. I saw on the dyno last night LS6 heads and an F13 make 8 more RWHP on 22 degrees WOT over 24. 45 @ WOT... crack kills. A good tuner will have you there while he tunes it and explain what he is doing, changes ect... Sorry to hear about it but you seem to be ok as you have a plan for more mods, or at least new HC swap. Storker??? Good luck.
Dave

 

I bet it is #7, the tuner probably set it up to run 13:1 or greater. In my opinion, it is detonation, and I doubt the 45* of advance. If the car had that much timing, it probably would have burned a hole in the middle of the piston if not the whole piston. There would have been way too much heat in the cylinder for too long with 45*.

 

Valve float from too high of RPM? perhaps playing with the Limiter and rev'ed it the 12 grand? THe guy says it was a head gasket blown, but we can clearly see that the piston is damaged from SOMEthing.
Can you show us shots of the head side?

edit: My mistake, wrong spot for a valve. SOMEthing has hit that dang thing. Did the dude drop something in the throught? Was the head removed before he got there to remove any evidence? that's what I would like to know.

 

He knew what he was doing Making more work for himself after it detonated. Next he will tell you "Liquid Steel will fix the piston " I won't let him push my lawnmower never mind work on it

 

Would this cause the Head Gasket & piston to go.

 

I would have to say yes on that one... way to much timing..

 

If that is in fact the timing table from the engine thats pictured I'd say get a lawyer because you've got a good case.

 

Stupid Is As Stupid Does. My mom always says life is like a box of chocolates. You never know what your gonna get. When it comes to this tuner i would say to anyone considering using his tune
RUN FOREST RUN!!!!!!!!!!!!!!!!!!!!!!!!

Z06 wife

 

I'll add my response, but realize I'm not as knowledgable as a lot of these guys on this forum.

First, it obviously isn't too crazy a head and cam package, with the pistons still as flat top and no flycutting, probably not too excessive lift. This means to me that the setup in and of itself shouldn't be tearing the motor apart, not that this means a lot. However, the more you build motors and (race and drive on the street), the more you realize that HP=Breakage, a lot of times anyways, depends on the parts and build. Blowing up a motor can be seen happening and this could possibly be a horrible coincedence. HOWEVER, the piston head cracked. When items fail for too much HP, you usually see a rod failure, a pin failure, or the piston fails where it holds the rod((pin). When the head cracks like that, I'd go with everyone else here, DETONATION due to TOO MUCH TIMING.

Anyways, after 25k miles, the only reason I could ever possibly say that the heads and cam caused this was that the piston had a casting flaw and the extra HP finally gave it in. There is no signs of contact between the piston and the valves, after 25k miles you would have noticed obvious detonation problems due to bad combustion chamber forms.

Your friend got screwed by someone not wanting to pay for a new "Corvette" motor. As how society goes now a days, ethics are not very concering to this "tuner."

You can press the point with the tuner, which will most likely lead to nowhere, court will probably not help, since the judge will probably take the side of the so called tuner....so....good luck...sorry for your friend.

Wow, all these words, just to say I agree.

 

small claims court low expense

They say "A little knowledge can be harmful? This tuner proves it.

 

pistons don't look lean to me, but it's not always easy to tell. Possibly timing was the issue??!!

Anyway, you are always taking a chance when you modify your car. That is why guys like Lingenfelter get a premium, they give you a warranty!

 

from the picture it looks like all the pistons have molted aluminum with 1 having grenaded.from the tables,i agree TOO MUCH TIMING and NOT ENOUGH FUEL.your buddy is up a creek,because your tuner/loser is not going to do didley.the shop that built the motor in the first place doesn't want to get involved for the simple fact it will be time wasted[he said/she said].by the time you try to get your money back,it will cost you more than it's worth.next time do your homework before you let someone touch your car.
FWIW,before the engine let go[unless the so called tuner backed it out],this thing should have misfired and rattled like a s.o.b. if it did,it should have set faults,if so and you have a scanner,look at freeze frame data.it will tell you what/when of what set the faults and give you the engine data[timing,coolant temp,throttle angle,rpm,etc.]before it let go.if the pcm was cleared after it went boom,all your info is now gone.