[braddddddd991]

Cruzin down the highway, and went to pass a car, gave it about 50% throttle in fifth, hear some crunching noise and boom......... -___-
blew a rod, so im putting all the stock parts on tomorrow and taking it to the dealer..

 

[Keshav707]

Sorry to hear man, put the car back to stock and Mitsubishi will warranty it. Just last month a friend did the same.

 

[SinisterEvoX]

Sorry to hear man. What speed and rpm were you at in 5th?

 

[sstevojr]

I've been wondering something, when I see these posts, is there ANY sort of precursor to these catastrophic failures?

 

[DBL R]

Just as an observer you constantly reads the "blown engine" threads, it seems like most people grenade their engine in 5th or 6th building boost. That sucks though, but now you can build it better

 

[SinisterEvoX]

I may be completely wrong here (as i am a noob), but i think it also has to do with people getting agressive tunes and leaving no room for weather changes. I've noticed that alot of these threads pop up during winter as the weather changes. Not saying its OP's fault or anything just stating what i've noticed and thought about the subject. When i get a tune in the future i will stress to my tuner to make a safe and conservative tune. Either way its going to be faster so I wont mind losing a few horses for a safe and conservative tune.

 

[Flipmode]

sorry to hear about it man.. next choice build it OR return to stock and get use warrenty on it my man

 

[ElementX]

Hard acceleration in 5th is never a wise choice I wish you the best of luck

 

[DrivenFab]

high load + low rpm = no more load.

 

[Hiboost]

Just curious what kind of boost you were tuned for?

5th gear (or 6th) gear typically causes the most problems because boost can peak much earlier in the RPM band and often that part of the map wasn't tuned since most cars are dialed in with 3rd gear pulls on a dyno. Not saying it was the cause but it's typically where you will see problems first. Cold winter weather doesn't help the situation as boost tends to creep upwards a bit as well.

 

[Cayden2]

5th gear....did you see a magical cloud of blueish smoke come flying out the ass end?

 

[betty2]

Back in the 80's there were few engine builders prepping allison and merlin aircraft engines for racing. The builders would crank the boost on the engines for additional power, but they noticed that the props themselves were going to fast and cavitating. Solution, was to slow engine RPM's. The high cylinder pressures and low rpm caused a rash of engine failures. In the end the prop was redesigned, but a lesson was learned.

There are reasons whey diesels have massive main bearings, connecting rods and even some running CP's higher than 2500psi for extended periods will run steel crowned pistons.

Never turn your 4b11 into a low rpm torque monster by lugging it in high gears; bad idea.

 

[gamaliel612]

I see a few blowing point here...your torque on stock internals and MBC...Maybe it's just me..If my opinion even matters lol..Hope you get it fixed man

 

[86azms3]

Interesting to see part throttle rod failure on another platform. We used to have quite a few blown motors back in the day on the mazdaspeed platform. Basically we said the same thing, too high of load at low rpms, plus a motor that may still be in closed loop leading to high afr's leads to rods rocketing to the stratosphere.

 

[Lesterh]

high load + low rpm = no more load.

This. People don't realize how much pressure boosting at low rpms puts on the motor. It's not really common knowledge I guess. Any time anyone drives my car (with me in it) they think they're in a Camaro and want to floor it at 1000 rpms and I have to scream at them. Once I'm in 3rd gear or higher, I don't accelerate until I'm past 3000 rpms. Unless I'm over 70 mph or higher, I put it in 4th if I want to go. And I'm not sure I've ever actually punched it in 5th unless I was over 100 mph.

 

[Hiboost]

There is a fix for that for those that can't resist... max out all the throttle tables at below 3000 to whatever percent you want and you can pin the throttle but it won't exceed the tables.

As far as the engine blowing at part throttle, likely the damage was already done and the engine was ready to go from previous detonation. It probably just needed one last push at boost to trigger the failure and just a matter of time.

 

[2snail]

before mine blew..i had a couple cylinder 4 misfire codes. did you ever have misfire codes? if so did the plug gap get bent shut?

 

[HappyMint]

Damn man this is awful news! I'm really sorry to hear about this.

 

[braddddddd991]

Yeah I had a cyl 3 mis fire code, so so I got new plugs about 2 weeks ago. I was going about 70

 

[HappyMint]

Ugh this is terrifying, I just had a p0300 multiple cylinder missfire code. I replaced plugs and injectors. Trying to leave nothing to chance :/

When the code get thrown? At high rpm? Starting the car? Cruising?