Well I finally picked up a PC3 usb for my 919. I have never used one before, but understand the basic idea of how they work.
I am looking for a map designed for a 900rr header specifically at low elevation.
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A couple of years ago, I got some time with LDH on the phone on PCs.
He knows his stuff, and his map work is seriously good)
I was asking about elevation as well.
My recollection is he told me "4000 ft" was his opinion of a custom map still being good/good enough as function of whatever the level of inaccuracy the MAP was introducing as a function of actual elevation vs test elevation. In retrospect, I think he meant a +/- 2000 ft band for a total band of 4000 ft.
This makes sense to me and sounds reasonable, as surely outside that, whatever the accuracy of the MAP is, combined with the fact there is no co signalling Mass Airflow Sensor, means a sharper result will derived by local testing and tuning than relying on maps derived at altitudes many thousands of feet away from your locale.
I suggest you try googlits map first.
Oh yes, 4: 1 and 4:2:1 maps look different than 4:2:1:2 maps, that's something else he told me, which started explaining to me what priorly had looked like bizarre maps. And if a pipe is mismatched to the rest of the engine, more extreme mapping adjustments become necessary.