Quote from: millinnium on June 18, 2014, 08:17:47 PM
Quote from: ecoboostsho on June 18, 2014, 08:59:31 AM
Quote from: millinnium on June 18, 2014, 08:48:38 AM
Those that are interested in the Learned Octane Adjust,
the readings in HEX and the result converted to % are:
DCEC = 54.81%
D145 = 73.01%
but i can't figure out the maths behind it. HEX converted to Decimal will make DCEC > D145 but the % result intepreted is the opposite...
If you look up a few threads we've got it figure out I believe on Page 8. On my car if I flash a new tune in it the LROA starts at 0 and after a long pull in 3rd and 4th at WOT jumps to 100% and then on my car it has slowly backed down to 75% over time. I'm guessing I could use a little more octane but it is still on the positive side...
Hi Ecoboost, i have tried your formula ((256*A)+B)/49152*100) but not getting the same result as what FORScan is showing.
For example:
Hex DCEC which FORScan calculated to 54.81% if plugged to your formula = 56556/49152*100 = 115.06%
Hex D145 which FORScan calculated to 73.01% if plugged to your formula = 53573/49152*100 = 108.99%
This is why i say the formula is not correct since Hex DCEC is mathematically smaller than Hex D145, yet the calculated percent value from FORScan shows it as a larger percentage.
Okay - given the two data points you've given I did a little math and the equation you should be using is (not 100% positive here but give it a shot).
((256*A)+B)*(-0.0000610124)+3.998717499
Yes I went crazy with the precision after the decimal points...and note that is multiplying a negative number NOT multiplying and then minus. It's just Y=mX+B format based on the points provided assuming I calculated it correctly.
Weirdly enough this formula and the one I figured out for the Taurus are not as far off as they might appear. If you calculate out 100% in this formula it equates to roughly 49152 but yours has a negative slope so smaller values mean larger numbers (which is what you noted).
Try this and see if it works. It's getting late here and my math may be off...the only other option is that your car is using the -1 to +1 referenced elsewhere and those values provided are actually signed binary numbers...but my brain hurts thinking about it right now so try this first.