The way that piston is melted is a severe lean situation.

 

Hello everyone I bought my evo 9 in Sept of 2017. It was stock with a cat back 44k miles. From nov - feb the car was off the road because I was in the process of putting bolt ons on the car. Feb 13 car was tuned Feb 14 motor detonated on the highway. Coming to realize the car spiked to 35lbs on the dyno could have bent the rod but wasn't fully on its way out who knows.. Later that night after my tune car sat for an hour or so and when I went to drive it the car started breaking up.. brought it back the next day (the 14th) one of the plugs electrodes tips broke.. (another sign) He put in new plugs gapped them to .022 then went out and adjusted the tune and sent me on my way and 7 min later this occurred going into my first pull with the new plugs. 3rd gear 3800rpm it detonated right as it spooled. Car made 404hp/369tq on a dynojet. Cylinder 2 is the culprit here. Pretty scary experience for the most part..

Mod List
Bushur Race Intercooler
STM 3" Downpipe w O2 Dump
3"TBE
FIC 1220
Walbro 255
Speed Density
STM Upper and Lower IC piping w a Tial Q Bov
STM 3.5" Intake
Running on E83~
Stock long block/turbo
Exedy Twin Disk HD








Now I'm in the process of figuring out what type of motor I should build...

 

Aw man! Right after the tune, you didn't even get a chance to enjoy it. There's a balance shaft poking its head out at us. Sorry this happened to you man. Will you be rebuilding the motor yourself or paying someone to do it? If you are a dedicated DIYer there are a ton of threads on here to help you through the process. After building a 2.3l I can tell you that they are fun as hell, but if I had to do it again I would go with a 2.2L. The 2.2 will give you nearly the same turbo spooling characteristics as a 2.3, but you can rev it out farther, keeping you in gear longer.

 

If I had the knowledge and tools to assembly a motor myself I would but as of now someone else is going to. I think I want to keep it a 2.0 for the time being, still want to do more research tho based on what the car will be used for, weekend car for the most part..

 

That sucks Mike, sad times

 

if your going to have access to E85 for the foreseeable future, you might consider building it for high compression.

 

 

Someone pointed me in direction of this tread. Was a stock 2l with fuel pump, exhaust, ic piping, intercooler etc. Think she had a bit too much torque and rod bolt let go. So fully upgrading to a forged 2.4 long rod

 

 

Rod bolts break from RPM's generally.

 

Look at that head. Cylinder 1 really took a beating. Are you able to reuse your head?

 

Will it happen if you run the stock limiter? I have bolt on's and hit the rev limiter here and there at Autocross.

 

Then the rev limiter is doing it's job and saving your engine

 

Stock rod bolts will handle 8k. I wouldn't slam the car off the limiter for 20 seconds and hop she holds though. A few popes off the limiter isn't gonna hurt it though. Rod bolts can also fail when the bearing spins and tries to lock up the motor up, not necessarily just from RPM. The force pull the bolts apart.

 

That head is barely hurt, easily reusable.