[BigDaddyEureka]

Welcome and so sad!

If the crank is still spinning, it's not too late to save the motor. It might take some serious effort and cubic dollars, but as Henry Ford said: "Failure is the opportunity to begin again more intelligently." Worst case, you reinforce what is busted so it can't happen again.

There are stories I could tell about myself and laying under the car late Sunday night wondering how I'm going to get to work on Monday. Anyone who hasn't been there hasn't done that has a lot more money than I do probably! What I learned is that hard work and perseverance (and the occasional 2x4 to my noggin') wins the day in the end.

Let's see those vids and dig in - hang in there!

 

[BigDaddyEureka]

Moving on to the diagnostic phase now....

Did you bounce off the rev limiter at all? What max RPM did you reach? These modern Hemis don't like excess RPM, and the supercharger isn't a big fan either. You can fix that with reinforced parts, but your mod list doesn't show any of those so it's important to know if there was a high RPM event in here to get on the road to recovery....

 

[BigDaddyEureka]

Second question...Given your mods, I see the potential for more boost, but stock injectors. That's possible but you need to be sure you didn't run out of injector and go lean.

So there's a couple of things to consider...will stay tuned!

 

[BigDaddyEureka]

Good question. I can only speculate, but I know I was probably in 5th gear as I was wot with speed still climbing. I don’t think it bounced the limiter but that day is all kind of a blur now. I heard the engine light sound, looked down and let off the gas immediately. I clicked the code that popped up on the tuner when I saw the multiple random piston misfire code P0300.

OK, so we were at high boost, pushing a lot of power when the bad thing happened. Interesting....

Any idea what your AFR was? There's actually a gage for it in the center I/P display if you call it up....

 

[BigDaddyEureka]

Take your time. Relax. The damage is done. Time to plan the recovery.

EXCELLENT advice right there - well said!

 

[BigDaddyEureka]

...I think I found as many people indicating bigger injectors are reccomended as said they’re not absolutely necessary. My future plans included bigger injectors.

OK - maybe someone could help us here...15 lbs boost on stock injectors OK? It's gonna be close for sure.

 

[BigDaddyEureka]

Quick listen...I couldn't make out much in the in the second video....but in the first one it almost sounds like the idler / tension pulley is squealing a bit.

FFBOS has a video of his Metco pulley issue here, and yours doesn't sound like that to me.

 

[BigDaddyEureka]

Here's a great article on how to change your plugs.

Here's a borescope available on Amazon. Yes, there are cheaper ones, but this one will actually fit in the spark plug hole (after my edit!).

 

[BigDaddyEureka]

I am not a tuning expert by any means but you can't have a single tune that works well with both pump and race gas...

Interesting thing on these dan1546 is that they can have two active fuel maps in the same tune, and can switch between them. Kinda unusual...I never ran into that on the GM LS motors or the Fords, but that's a thing here. Speedy has some good videos walking through the inners of the Hellcat tune if interested. Just search for them here on the forum.

Now, are they a good idea? Seems to work for plenty of folks, especially 93 octane / E85, BUT the tune won't magically make the injectors flow more fuel than they are physically capable of flowing...so ya gotta know what you're doing to make it work! You don't want to be your tuner's first Hellcat engine if at all possible.

 

[BigDaddyEureka]

3XBlackCHC - You can post the files to a Google Drive or Microsoft OneDrive account, and then use the link function (7th button in from the left on the tool bar) to point to them. Just be sure to set the sharing to what you want on Drive / OneDrive or it won't work.

 

[BigDaddyEureka]

OK - Just took a quick rip through your log files with the Diabolosport reader (available here for anyone following along with the story so far). FAIR WARNING: I AM NOT A DIABOLOSPORT EXPERT but I have looked at my fair share of log files in other software. Take what follows with that big spoon full of salt please!

Problem #1 that I see is that there is NO AFR or Lamda measurement in any of the files, and nothing that looks like an aux O2 sensor either. That means whoever was tuning this was looking only at knock retard, injector pulse width, and MAP to do your tuning. That ain't good in my book. Sloppy at best, terminal at worst.

Problem #2 that I see is that it looks like your injector pulse width is maxing out in places. In the file 20475_01wot_0.log, it bounces off 100% at 0:16 into the file. In the file 20475_01wot2.log, it bounces off 100% at 0:12 into the file. In both files, there's substantial periods above 95% duty cycle, which is not best practice. In the file 20475_0160mph.log, the scales are reversed (maybe?) but it appears the injectors are again maxed out between 1:30 and 1:33.

So first blush - and please have someone with more Diabolosport experience than me chime in here because I could be wrong - the engine went lean because it ran out of injector flow rate. Add to that a heavy footed run to the track and some full WOT runs, and nothing good was destined to happen.

Worst case - per the original title of your post - there's a dead piston / burnt valve somewhere. BUT - best case, you chucked one or more plugs running lean and fixing that may bring it back around. It's work if that's the case, but not cubic dollars.

Either way if I'm right about reading these logs, you're going to want to get new plugs in there. If as you pull them all the electrodes are still in place, then sorry for wasting your time - but that's my first guess based on what I see here.

Good luck! - Keep posting as needed.

 

[BigDaddyEureka]

Lean condition usually. The cylinder temps go up and it super heats the plug. Fingers crossed you got lucky and plugs are all you need but put a bore scope in there and take a look.

Looks like some detonation on the last ones but the hellcat plugs a hard to read. I would say it’s the typical plug melt from not enough octane and or to much timing. Slap some new plugs in and go.

Yeah, the one plug is melted from running too lean I'd think too. Good news is stick that scope in there and maybe you got lucky!

Hey, it's more important you've got a great wife willing to pitch in. It's stressful, but enjoy the project together.

 

[BigDaddyEureka]

Here's a link to a compression tester with nice large 3" gauge. Not too much money, good to have if you don't have one already.

 

[BigDaddyEureka]

How much different in price is it between 1050 injectors and 1300s?

If you go with the big ones, does that cause a tuning problem due to linearity?

Paging Speedy ...

 

[BigDaddyEureka]

I'm not sure where the problem is, but here's a link to the FCA training materials for the ZF 8-speed family. Electronic stuff begins on page 86.

It's always good to rule out the straightforward stuff first, especially if it was NOT reporting those issues when you parked it last. Battery voltage and ground continuity are usually where I start on these things.