SOI Advice

[Marajin]

(01-25-2017 )Running rough Wrote:  ..
I am led to believe @m*m^2 style tuning uses a fixed position at a given rpm and load meaning you more then likely will have more boost the colder and denser the air is that is why the turbo mapping has to be fine tuned to the type of truck and environment it will run in, it is said that the stock mass flow calculation turbo mapping can not touch the @m*m^2 custom mapping in both performance and fuel efficiency when it is dialled in correctly for the given truck and application,
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Actually I can see that it has an operating window with a min and max correction range to the turbo itself. It is not completely "fixed". It simply limits the engine from allowing it to go too far out of whatever bounds someone has set for it. - Need a bigger window? -- just make the window larger.

I tend to mostly agree with this advice

http://rawze.com/forums/showthread.php?t...2#pid11192

that you should be on the lower side of optimized boost levels for exactly those reasons. I would think that setting a bit on the lower side also gives it that wiggle room that may have been programmed out of your own engine(s) to get more out of them.

(01-25-2017 )Running rough Wrote:  ...
soi is another thing but I would think the cold air up here combined with extremely advanced timing i would have a bad feeling about it under heavy load, for instance I can notice slight crank flex vibrations, in cold weather with the high torque cals, and I believe the timing is mostly stock, take it in to warmer summer conditions and the crank flex disappears, now if a guy advance the timing to much I am sure the vibrations would increase, and that can't be good, but as always don't lug the snot out of your engines if you want maximum life,

As far as hot/cold environ, high altitude, sea level, etc.. The "explained" doc I read on MM strongly and heavily is against disabling corrections for altitude, temp and everything else an engine needs to make proper timing, etc.

I have also seen plenty of factory programs with MCF turned on that could not handle extreme cold or hot too. I think even Unilevers talked about it on here before because he has to deal with it up north where he is at quite a lot.


Just what I see here after reading all of this ..

- Not very many people have power set for high torque or go to the extremes that you seem to want to do. Looks counter-productive to push an engine hard like that only to have to spend so much money replacing its guts more often for such slight gains on the roadways. - Throw that upper edge programming and mods and pushing boost to its upper end into an extreme cold or hot and that may be the very thing that does your engine in. I think at that point you would only have yourself to blame for it. Those things can only take so much stress before they say enough is enough. Just because you keep wanting more does not mean it can keep up long term, or in extreme hot/cold. There must be wiggle room for just those scenarios. I know plenty of guys that have pushed and pushed and pushed,.. only to end up with a broken engine saying that it costs too much to operate like that. They usually always end up setting their truck power back down to more reasonable levels and settings in the end.