^ i don't think that doing bolt ons will necessarily cause your car to go boom instantly, but a person runs the risk of running lean and doing damage. Cars today need tuning when you bolt things on as the ECU's are tuned for the stock parts. This is what was killing Honda owners with the 2006-2008 Civic Si's. There was no way to tune the car until Hondata finally came out with FlashPro in 2009. Later, people found out that their intakes and exhausts were causing severe leanness in the AFR.

I am a child of the 50's and 60's, when you could bolt parts on and see instant power gains. Tuning consisted of adjusting mixture screws on carburetors and ignition timing and changing to fresh plugs. To get really fancy, one could have have the distributor ignition advance curve changed using lighter springs. That was about it. The only way to test things was to go out on the highway and let her rip.
We used to change plugs regularly as they would foul easily, especially if you ran colder plugs. Working on cars was much simpler back then, but you never saw the gains that people get today.

 

Nobody knows WHY did anything. There has also been evidence of some 2012's not having this issue.

 

I haven't followed this thread for awhile. I was going to let the pro's figure it out

So basically if I stay completely stock the car will be ok. If I add on any bolt-on I should make sure I get a tune or the car might crap out?

 

Stock 2012 Evo's are blowing? Why? Whats the difference between the 12 and the 08-11?

 

^ Yeah, good question. I have never read of any stock X's blowing up and certainly have never read anything specifically about 2012's blowing up.

 

What STOCK 2012 blew there motor I have not read that any STOCK 2012 were having problems blowing up. Of corse someone is going to have there problems there has to be a couple of lemons out there and we all hope that were not the one with the lemon.

 

He didn't say 2012's specifically. I think what he is implying is that STOCK Evo's have been brought into dealers and denied warranty because of aggressive driving.

Even if he is serious, which I doubt (probably just poking fun) it would be VERY difficult to deny a legit warranty claim unless the driver was running red line non stop and blew the motor.

 

The one difference I know for a fact, is 2012's are using a different cam/crank phase to control timing and injection.

 

This has been proven? How was this discovered? And why did they change this from the 08-11? Like someone said earlier, it seems unusual for Mitsu to make a change like this right as the production is coming to an end.

 

Because the 2012 4b11t uses a different reluctor ring than 08-10 4b11t's. That's a fact. . . How was it discovered, a few guys bought "new" motors from mitsu to be built instead of using their own cores. When they installed the motors with the newer ring, the cars didn't run.

Why they made the switch is odd. Maybe they are using the code for other soon to be released motors, but they did change the cam/crank phasing.

 

Maybe its a cheaper part, lower production costs...

 

This wouldn't affect the tune and the motor to be down on power. If that were the case then the 2011 would be suffering as well since you clearly stated the change was after 2010. What doesn't make sense is the fact that some people aren't having the issue at all.

I'd really like to get to the bottom of this. I also have a 2012 and will be getting it tuned soon.

 

Means injection phasing has been altered as well most likely. All pieces of the puzzle finally coming to light.

Aaron

 

Think this can be worked around then?

 

So why wasn't the 11's affected? He said their different pre 2010