Do dynos read low or are manufacturers figures over optimistic? And are manufacturers figures taken at the rear wheel or the crank? When I took my Streetfighter to CJS for a custom map it was reading 141 bhp at the back wheel. After the remap it was reading 150 bhp at the back wheel which would equate to about 160, or just over, at the crank. I was advised to be sceptical of at-the-back-wheel figures from either manufacturers or the press. They are usually crank figures and they're certain to be best figures taken from best runs on a best bike (or best engine on the bench). Built to a price, mass-produced bikes are not all the same (especially Ducatis) and different dynos do give different readings. Rich Lewellyn at Louigi said that people often claim Chris's dyno reads a bit mean and higher figures can be obtained elsewhere, and they probably can, he says, but numbers don't matter; what matters is consistency and the difference in position and shape between the before and after curves. When I rode my bike after the work, I couldn't feel the numbers but I could sure as hell feel the new shape and position of those curves at every point in the rev range. In fact that chart is imprinted in my brain like a map. What I can see on the piece of paper corresponds exactly with what I feel through the seat of my pants. And that's the point.
May be coz I is a thicky knob but that fuelling looks all over the place!! I'd be asking them to do it again. My 848 after custom map went 131 to 139 on same dyno, same day...maybe its just a low read one
I'd think that was pretty good for a 900 twin. Shapes nice too. But I'd have thought a full system and programme would make more of a difference. Or are 899s that good as standard that gains are hard to find?
I would have thought a professional dyno would have to be calibrated to a standard every 6mths- year. Just like you would with torque wrenches and other measuring equipment.
I would have thought so too. But go on any bike forum and people claim that so-and-so's dyno reads low. You never hear of any that read high. And how many people have taken a bike from one tuning shop and gone to the expense of having it checked somewhere else for comparison? It all seems to suggest that its not dynos and calibrations which are unrealistic but expectations, and that performance figures for production engines are not nearly as consistent and uniform from one bike to another as we hope and as the manufacturers like us to think. Edit: all the more reason, as the bike is a keeper, to have my SF engine balanced and blue-printed so that it is assembled and running as close to perfect as possible before any further performance mods are considered.
I'd suggest any Dyno showing a panigale 1199 with simple bolt on mods giving more than 190 reads high...amazes me how many k6 1009's with a PC and system make 180hp
Is that the one which all bike manufactures use ?? The new standard is now called Brochure Horse Power.
They all take it at the crank, The same Tech who did mine had a 1198 who reads 143 at the back wheel...
