Question on smoke output

[Marajin]

(11-12-2016 )Rawze Wrote:  ...
It is also why bad deletes will cause repeating turbocharger failures, because the engine will see the blocking plates in the EGR system, or the valve closed, and try to make up for it by over-spooling the turbo out of control.

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For everyone's curiosity who might have it, when someone maps the turbo properly during MM, it solves the factory programmed out-of-control scenario completely. It turns off mass flow compensation control and re-maps the turbo to run within a narrow window of pre-determined position ranges at every given rpm and fueling range throughout the engine. This means it will not go out of bounds, and only has limited compensation for small boost leaks, but not big ones. A larger boost leak will simply mean you get lower boost, and you can see it as a problem on your boost gauge. This is much safer for the engine instead of over-ramping the turbo to get what it wants. It also makes it much easier to troubleshoot fuel mileage related problems because it is not fighting for control any more. It simply goes somewhere and it is easy to see if it is providing proper boost or not. No need for guessing any more.

It is funny,... a LOT of trucks that have claims about turbo issues and associated turbo alarms, dealer says turbo is bad, etc. 70% of the time, after the OEM has deemed the trubo is bad, etc. and causing the emissions problems.

As soon as you MM it and it takes away the MC flow compensation, Magically it is fixed and operating for hundreds of thousands of more miles without issue.

I have seen it many times.

Tells me a lot of turbo's get replaced just because of a few incorrectly reading sensors. $4,000 dollars later and problem clears up slightly for a bit, then comes back in a few months. This is because the turbo when brand spanking new may be slightly more responsive and makes the sensors that are failing on the other side of the motor happy for a while.

After it brakes in though and settles after a few months, the sensors all go complain again, making turbo problems over and over. Those dumb bastards art the repair shops never give a second thought towards cleaning out the EGR pipes or replacing the other engine sensors first to see if the data the ecm is getting is valid. Their attitude is that if a turbo fixed it last time, the put another one on and go again. More money for them, and you are now broke and desperate, and cursing your engine.