I took a shot at guessing the Hp from a 2015 800 ETEC since we only have the numbers for a test run with +2 deg timing and nothing for stock timing.
I tried using the difference between pre and post breakin on a 2013, then added it to the 2015 Pre Breakin, but it didn't add up so I canned that idea. The two dyno sheets were from different sleds and on different days, so I suspect the Hp was off from one to the other.
Then I found two dyno sheets done on the same sled on the same day with the only difference of 4 degree timing. So I got creative and halved the difference at each RPM and used those numbers to subtract from a 2015 ETEC Post Breakin curve with +2 deg timing in the hope that it would negate the +2 deg timing and show a more realistic stock timing curve. The same was done with the 2016 curve. I'm not sure if that made sense, so I'll give one example.
2013 ETEC @ 7900 rpm with +4 deg timing provided +6.4 Hp on one particular sled.
Take half of 6.4 Hp = 3.2 Hp when increasing timing by +2 (just a guess).
Subtract 3.2 Hp from a 2015 ETEC @ 7900 rpm that was tested with +2 deg timing to hopefully get close the Hp with stock timing. The pre production curve for the 800 ETEC gives some clues to see if this simple calculation is in the ball park.
Please remember there is data manipulation to put this graph together, and with the variance between sleds there is a degree of error to be expected. (Edit: Since I first posted the graph I did find a mistake in the 2015 estimate at the top of the curve. The revised graph looks more realistic, and the 2016 estimate has been added.
The aim is only to show the complexity of a 10 Hp increase between the 800 and 850 ETEC, and not knowing which curve to compare with. It does appear that the 850 has a clear 10+ Hp increase from the 800 @ 7900+ rpm, and an even larger increase when compared to an 800 from 2012 to 2013.
Edited by Daag44, 13 May 2016 - 12:14 PM.
