Finally decided to pull the engine out to build it. It was still running fine before pulling it out. To my surprise, the evo still made good power with only 3 cylinders. Check it out. Made 330 hp on EnglishRacings dyno 6 months ago which was low according to the tuner. Compression test shows 15% compression in cylinder 4 and.. well this is why.


That chunk went straight out the waste gate since the turbo was completely fine. Some minor dents on the cylinder head, valves were normal with 100% compression.
I got lucky that didn't mess anything else up, but just goes to show that the 4b11 is reliable even with 3 cylinders.. somewhat lol

i was wondering why, for the longest time, every time I start the car up it always sounds like a cylinder stutters.anyone wanna take a guess as to what could have caused this?

 

that big of a chunk made it to the waste gate with out touching anything? Wow how is that even possible?

You got lucky!

 

right? I won the lottery with this one

 

I'm pretty impressed. Hope you tear through it and make sure everything is still in good condition.

 

Almost exactly what mine did. This was a day where it made 517 on a mustang dyno through the SST trans though. I think a wastegate line came loose and it overboosted. Completely my fault. I knew it was pulling way harder than normal and the CEL flashed. I just stayed in it because...well it was pulling like a freight train.




- Robert

 

Wow I didn't even know that could happen. Super lucky it missed the turbo though! What would cause such damage?

 

Wow. Really lucky

 

Wow

 

:O


Casting flaw?


Remove the first cat and inspect the inlet - is the chunk there?
Maybe borescope the turbo too.


That is a big chunk to pass...

 

Running test pipes. I checked the turbo fins and it seems normal, no dents or damage. I doubt it thered be any damage inside as I ran for a good 6 months with low compression. I'm pretty sure I heard it go through the exhaust as I recall hearing metal pinging really loudly one day, I thought it was just a rock but, out goes the piston

 

Hey Brian, can i ask what mods you had on the car when you went in for the dyno?


Did you ever figure out what caused it?

 

alll the basic bolt-ons. 4in intercooler, 3port ebcs, blitz intake, ticp + licp, ets o2 dump downpipe, testpipe, hks catback, aem meth injection (50/50). All this while running 30 pounds boost @ 12.5AFR. Stock turbo/block. My tuner thinks it's a meth distribution problem, ran extremely lean in cylinder 4.

 

Meth injection is too unpredictable to trust it so much in order to reliably be running 12.5:1 AFR.