Why oh why does the X run rich? I don't understand the reasoning for this... Is that how mits was able to squeeze 291 hp and 300 tq?

From my understanding its running TOO rich, so much so its just not necessary, which makes me wonder... WHY? why would mits allow them to ship that way?

any insight would be greatful

 

safer than running lean

 

I guess that you don't know very much about engine managemet principles, but running that rich hurts power output, it doesn't help it. It's a miracle that it even makes that high of power on such a terrible tune. It's there as a margin of safety, but on the overboard side. This is common for auto manufacturers, Mitsu just went too far with it. When you get your car reflashed with ecutek or whatever software you prefer, a huge chunk of the power gained will be from leaning it out. The rest will come from boost, Mivec tuning, ignition timing, etc I hope this helped to answer your question.

 

I was just about to comment on this, but you beat me to the punch!

 

In addition to what STi2EvoX said, I believe Mitsu purposely made the tune overly rich so they could easily "upgrade" the power in future years of the vehicles product life cycle. All they need to do for the 2010 model is adjust the tune and then say the car makes 300hp and 320lb-ft. Both increases in the car's output, but not really anything done other than the tune. Auto manufacturers do this all the time.

 

STi2EvoX, yes i realize that, but what i was asking is Why?

That makes sense, i guess i'll buy it...

 

i need that flash!!! bad

 

Hehe, I think it's a ploy by Exxon (who definitely has their hands in the auto-industry) to make it that much more of a gas hog ;-) I am probably alone and will be called a conspiracy theorist, but it's the only logical explanation I can come up with given HOW rich it runs.

 

Doesn't really matter anymore. Flash #2 at least makes it smooth or you can do a turn or two on the wastegate and bam...you are good to go and more leaned out. I don't understand the logic behind running so rich by Mitsu either though, maybe just a mistake...I am sure even a car manufacturer can make them.

 

how strict is mitsu on voiding warranty on moderate ecu tunes..?

 

I think it really comes down to the dealership you get it serviced at. The one where i live tells me any modification that isn't purely aesthetic will void the warranty. It seems to me some are more stringent than others

 

...and it depends on the tech who gets the car. Some guys will look at a car that has mods on it, and start poking around to see if maybe they can slide by with trying to get cp work out of the job. Others will just do the job, and look the other way.

 

so the motor doesn't go pop @ 30k miles. It allows for a wide aray of operating conditions and users (temp, altitudes, margins for differences between ecu's etc, an owner that beats on the car) in a nutshell guaranteed longevity.

The good news is that a good tuner can safely extract a lot of hp/tq. left on th table.