How does this keep happening

[robmustang201528]

Crazy. I see guys out here running 12lbs of boost on pump with no issues. I get 10.5 lbs of boost and need a new short block... wtf smh

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[mustang1]

torque booster sounds like it will run hotter and cyl 8 is more vulnerable to heat.

 

[robmustang201528]

So should I get a new tune through another company? Take off the tq booster? It felt like the tune was on point. I had zero drivability issues. Car pulled pretty good. Check engine kept coming on. What should I do? Machanic said it was a Ford defect. Do I need to have a longer break in period? I did about 1000 to 1200 miles break in period

 

[Tommy V]

How much timing was u seeing at that boost??and was u on 93 only??

 

[Chainsaw]

Read this thread specifically the posts from Bill Jones. Looks like a weak spark could cause it. Is the broken ring land on the intake side of the piston?

http://speedtalk.com/forum/viewtopic.php?t=19031

 

[Dusten]

So should I get a new tune through another company? Take off the tq booster? It felt like the tune was on point. I had zero drivability issues. Car pulled pretty good. Check engine kept coming on. What should I do? Machanic said it was a Ford defect. Do I need to have a longer break in period? I did about 1000 to 1200 miles break in period

That isnt a defect. That isnt a break in issue.
Ringlands are killed by detonation and heat. Its possible it didnt detonate, but is generating enough cylinder pressure and heat that it expanded the rings so they butted and cracked. Unlikely as the ends if the rings dont look like they have seen that much heat.

E85 is a band aid in this case. This setup should run just fine on pump. As stated, 100s of cars run this setup without issue. Id be curious to see datalogs from your tune.

Lund tuned it, but how many revisons are you on? If you're on the base tune that's an issue. No tuner gets a setup like this correct on the first try.

When you got a cyl 8 misfire before you replaced the cat that was a huge red flag. The ringland issue is why your cat failed, not the other way around.

If your "mechanic" suggested removing the cats with a misfire code and didnt do a compression test, he sucks. Period.

 

[robmustang201528]

Thanks for your help. We removed the cats after the misfire code. Then I drove it home and the check engine light came back on after removing the cats. The driverside cat got clogged the first time. We figured the clogged cat was the reason for the misfire code and the broken ring. But now I'm having the same damn issue again with a new short block. Like you said the is not a complicated setup and E85 with just band aid it so what should I do? I talk to lund and they're saying it's not their fault. They told me to check my injectors which I did. Nothing wrong with them. If you were in my shoes what would you do? I can't remember how many revisions I had with the tune. Maybe 3

 

[Dusten]

Thanks for your help. We removed the cats after the misfire code. Then I drove it home and the check engine light came back on after removing the cats. The driverside cat got clogged the first time. We figured the clogged cat was the reason for the misfire code and the broken ring. But now I'm having the same damn issue again with a new short block. Like you said the is not a complicated setup and E85 with just band aid it so what should I do? I talk to lund and they're saying it's not their fault. They told me to check my injectors which I did. Nothing wrong with them. If you were in my shoes what would you do? I can't remember how many revisions I had with the tune. Maybe 3

A) get a new mechanic
B) get a new tuner

This issue is 100% tune related. No fucking way two engines failed identically.

 

[robmustang201528]

Thanks man. Any suggestions tunner wise?

 

[mustang1]

you could shop for a short block that is designed for FI. Or try to figure out how to reduce heat, such as dial back the boost and jettison the torque booster.

 

[Dusten]

Thanks man. Any suggestions tunner wise?

Id search on here. I dont know the 5.0 tuners. Mines stock and staying that way. I have to many toys anyways

 

[Chainsaw]

A) get a new mechanic
B) get a new tuner

This issue is 100% tune related. No fucking way two engines failed identically.

May not be the tune at all. Could be a bad spark plug, bad spark plug gap, or a weak coil on hole #8 both times.
Go back and read post # 20 and answer the question. Which side of the piston was the ring land broken, intake valve side or exhaust valve side?

 

[Dusten]

May not be the tune at all. Could be a bad spark plug, bad spark plug gap, or a weak coil on hole #8 both times.
Go back and read post # 20 and answer the question. Which side of the piston was the ring land broken, intake valve side or exhaust valve side?

If they reinstalled the old plugs in the new motor I stand by the fact that his mechanic needs fired.

I also want to see the datalogs of spark and afr

 

[Dusten]

May not be the tune at all. Could be a bad spark plug, bad spark plug gap, or a weak coil on hole #8 both times.
Go back and read post # 20 and answer the question. Which side of the piston was the ring land broken, intake valve side or exhaust valve side?

Tuner and tune go hand in hand. If there is an issue with detonation, regardless the cause the tuner would've seen it as knock. He should've mentioned it.

 

[Chainsaw]

Tuner and tune go hand in hand. If there is an issue with detonation, regardless the cause the tuner would've seen it as knock. He should've mentioned it.

There's no sign of detonation on the top of the piston. Most likely the detonation happened in the ring groove. Under boost weak spark will cause the ring groove to fill with fuel. Getting out of boost causes accumulated fuel in the ring land to detonate, breaking the ring land.

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