What do you think melted these pistons ??
9PSI boost -- 350whp 293 torque on previous run -- 11.75 AFR -- timing not cant remember tuner looked at data log and said it was ok-- the tuner is a 15 plus year Honda only builder super good reputation and super good guy to work with
Do you thing the AFR sensor was wrong
To much timing
??????

video of it happening

 

Nobody can tell u but the tuner/builder/disassembler.

Could even be a fuel pump failure or inj failure but if th logs show solid afr... then idk

It def got hot hot hot

 

I'm the builder and disassembler and poor as could be now just want to figure it out before I get it back together with some bc rods and weisco pistons
I have a dietchworks dw65c fuel pump and bosch 1000cc injectors
using hondata flash pro car is a 2009 acura tsx with k24z3

 

That looks more like piston ring land failure, then a melted piston. What do the tops of the pistons look like?

 

Here are some pics of the top of the melted piston

 

I think this is a ring gap issue. All the ring lands are broken and it allowed the gases to eat away at the insides on that piston. What was your top and second ring gaps and final bore size?

 

All stock 40,000 miles on car

 

Did you drive the car any after the turbo kit without the tune?

I was going to say ring gap too...

 

babied it to the dyno shop no boost we were on the dyno doing driveability and then made about 10 pulls before it let go

 

Clogged injector, or low fueling , I'd like to say.

Where you checking your plugs?

 

After 10 pulls I wouldn't think it would have been a fuel problem short of pushing past what the injectors can handle. But I'm still new to tuning so

 

Plugs two runs before melt down 6 PSI of boost
they all have brown on the ceramic some of the pictures dont show it

 

Looks like det. quench area of pistons looks like it's blasted, pitted. That would also explain the cracked ring lands, in three pistons.

 

That doesnt look like pitting to me. It looks like its just the bumpiness of the cast piston. In focus pictures of the pistons would help. Use macro mode or pull the camera out and zoom in.

 

[QUOTE=Muckman;49006653]That doesnt look like pitting to me. It looks like its just the bumpiness of the cast piston. In focus pictures of the pistons would help. Use macro mode or pull the camera out and zoom in.[/QUO

The pistons aren't pitted the top edge is melted above the hole the rest of the top of the piston is undamaged

 

Usually you crack ring lands from detonation. What did you change in the mapping two runs after the pics of the plugs?

 

little more boost more fuel less timing

What about should my timing be with 10.5 compression and 12 PSI boost ??

 

On stock internals? Mild

 

Odd. I dont really see any signs of detonation on those pistons.

 

Courtney Green torched your motor?? Good grief!

Wait, so you are missing chunks of pistons 2 and 4 also? It's really hard to say whether it was a tuning error without looking at your tune. Courtney knows what he is doing, but we're all human.

I DO know for a fact that he doesn't do much with individual cylinder trims, or reading of plugs when he's doing a customer's car on that dyno there in Ogden, which always made me scratch my head. When he is tuning a customer's car on the dyno, he relies solely on reaching MBT to tell him when he has put in enough timing. What this means is that he has no idea if just one injector is gimpy, or if just one cylinder is having ignition/fuel issues. After watching him closely, I heavily rely on reading my plugs now; after a couple of pulls you gotta see exactly whats going on in your cylinders. Dyno's are great, really great, but the plugs will tell you the straight full story.

It just seems like he makes a lot of assumptions about an engine when he starts to beat on it on the dyno. Still not saying its his fault, just observations and personal thoughts about safety.

Post up both low and high cam timing maps and what fuel you were running. Judging by the orangey hue of your plugs, i'm guessing straight pump gas?

 

what heat range plugs are those?

 

"All stock" eliminates a ring gap issue in my mind. Whatever the issue was effected all cylinders. If the AFR's looked good that would eliminate injector/fuel pump issues. You are pretty much left with too much timing.

T1 pulled my plugs 3 or 4 times during the tuning process.

 

How can you say that? Are you ignoring the broken ring lands between rings 1 and 2? What causes broken ring lands besides butting rings? "All stock" is more susceptible to butting rings because the gaps are designed for a lower heat/lower cylinder pressure NA motor (tighter gap).

 

If your cylinder walls aren't to messed up from the blown piston debris, It would be relatively easy to get the car back on the dyno. I'd say go for a forged piston/rod combo, leaving the factory cylinder walls in there (unless you have higher power goals, but your turbo doesn't look real big).

Check your clearances with a bore gauge, hone your cylinder walls, new rod bearings with correct clearances, ARP rod studs. Proper ring end gap spec. for BOOST. If you have everything on hand, and know how to use measuring tools like micrometers, you could do it all yourself over a weekend, and if you measured right then this won't happen again.

Break it in, pull some timing out of your maps for safety and get back to tuning that beast, adding timing back in SLOWLY - checking your plugs in intervals. And don't let something like this get you down. I have had similar hiccups like this happen, but after licking my wounds and meticulous money saving decisions my engine has come back stronger and better than before. With smart upgrades to the internals, you will be happier with a longer lasting/running boosted engine.

 

Thank you for the help, the cylinder wall is out of round right where the hole is in the piston by 6 thousandths so I will be going 20 over on the pistons thinking on wiseco pistons and brian crower h beam rods with the arp 2000 rod bolts the turbo is a precision 5858 my goal is 400-450 whp on 12 psi of boost does that sound doable it is my daily driver and hobby I just need to be faster than a lightly modified subaru sti those things are like flies around here (my car sounded just like one after the piston meted running on 3 cylinders LOL)