Willy, as a mechanical engineer, I know what works on paper and "computer models" doesn't always apply to the real world hardware. You, as a long time auto mechanic should know that the stuff in books doesn't always work on the real world hardware.
Case in point, the double rotor Chinhook helicopter - one of the military's work horses DOESN'T FLY ON PAPER. If we only go by what works on paper, then the military would be asking you to develop.. nevermind, no they wouldn't be.
Let me ask you something based on your last post:
"if intake builders for these quads had air flow data it could be more accurate, but it still gives more than just guessing." those are your words, correct?
So what you are saying is that you computer models are close, but could be closer? Why is it so hard for you to undersatnd that BRP gets their maps CLOSE for the OEM hardware .. but when you change something to become NON-OEM it only gets further and further off? Take some of you cam lobe data and change a number or two.. does it throw your entire data out the window? I'm sure the same happens to BRP's model when we change an exhaust and add a different air filter. They can't test everything in advace, can they?
Tell me this, sir, why is it, in the automotive world and now even some motorcycles, they have moved away from the OPEN LOOP system? That means, the throttle body injections are pre determined by a map - given certain input variables, the injections come from a lookup table. The injection happens, and it's just assumed the result is as desired.
They have moved away from that OPEN LOOP system to a CLOSED LOOP system. That means, they pull the injections from a lookup table, and instead of just assuming the result is as desired, they use an O2 sensor to MONITOR the results - and if the results are NOT as desired, things get changed in the system. Closed loop - ya close the loop by MONITORING the results. Ya can NOT monitor the results from the front end, can you?
POINT in case, why do you have to enventually replace the O2 sensors on cars and trucks? If they weren't needed to get keep your vehicle running correctly, then why do they effect the tune when they begin to give false readings? Are you now saying that Rotax knows more about tuning than Ford, GM, Chrysler and EVERY OTHER gas engine manufacturer that has moved to O2 sensor monitoring?
I don't know open loop vs. closed loop from Vtwin as you will likely assume I've been spoon fed. I know it from real world exposure as well as systems control courses in college.
You post on a Open loop system here on Can-Amtalk... you post, and you assume the result you desired happens - and that's that we just believe what you say. Truth is, your open loop system never did any map work for people that can think for themselves and use advanced technology to move forward.