1000DS SS ie: Base runs, Mufflers, etc
The new top end 2V Supersport model, the 1000DS dual spark engine is a fairly comprehensive update of the current 2V design, somewhat akin to the change from Desmoquattro to Testastretta. Basically, it is a mildly modified bottom end (basically the same as the 998/999 Strada bottom end) with new heads and cylinders as required. So, as well as having a capacity increase over the old 900 engine, it also has some fairly significant mods to air flow and, perhaps most importantly, cooling.
So, to the first graphs. This is the shop demo 1000DS SS ie. Green is all std. Blue is with some slip on mufflers. Red is with slip on mufflers and DP air filter kit. All runs are done with the std ECU, and no fuel changes. This shows 84 Hp std, and 89 Hp with the (not fully developed) mods. Very cool. Power first, then torque.
Now some runs for the steps taken with air/fuel mixture curves added. Again, green is std. Blue is slip on mufflers fitted with no other mods. Red is slip on mufflers and DP air filter kit with no other mods. As you can see, fitting the mufflers and even the air filter kit has pretty much no effect on the mixture even less than on the 620. This mirrors comments Duane made after his US trip, when he said the 800SS ie responded very well to the remapping, but the 1000DS M ie didnt feel a huge amount different. Id probably like to see the mixture a bit richer overall for best power, but running it on the new breeds of denser, high octane/premium unleaded fuel should be ok at the high 13:1 air fuel ratio. Im quite surprised at this, and really cant explain why the biggest engine, with the highest demands on airflow, improves the least with open inlet and exhaust. Maybe something else is the restricting factor here Id like to see some tests with 45mm headers on one of these engines. That may bring even more power. The wacky lean spike at the start of the all std (green) air/fuel trace I cant really explain. The bike certainly behaved itself and pulled strongly when the throttle was wound open at the start of the run, but the leanness is shown in all 3 "all std" runs. I didnt notice anything in this range on the road at all.
So, unlike the 800, where I was looking for some extra fuel to find best power, the 1000DS seems quite happy as is. Maybe the dual spark plugs help here too Ive seen 4V go as high as 17:1 air/fuel at WOT and still make almost the same power as the correct fueling, so good combustion does help compensate for a lean mixture. With a plug on either side of the chamber, Id expect combustion to be much more consistent and stable on this engine. Whether this also corresponds to improvements in fuel economy over the 900 well have to wait and see, but I wouldnt be surprised if it was better. The extra compression will help there too.
The next two graphs show the differences with slip on mufflers and air filter kits. Here the 1000 loses some of its lower RPM advantage, but is still quite a bit stronger.
Next a torque comparison with a bike of similar capacity, but some more airflow the 996cc ST4S. Generally, engines of the same capacity will produce a similar peak torque value at some point in their RPM ranges. However, the ST4S outdoes the 1000DS easily everywhere, making 12% more at its 7,000 RPM torque peak than the 1000DS does at its 5,700 RPM torque peak. Both bikes in this graph have air filter kits and slip on mufflers, the ST4S an Ultimap U59 ECU as well. The 1000DS is red, the ST4S green. The 1000DSs calculated valve area, even with the 45mm inlets, is still 22% less than the ST4S, making the obvious difference. Helped by a little more compression as well, and bigger throttle bodies, bigger header pipes, you get the idea. The usual 2V- 4V thing.
Thats about the end of the 1000DS report. Good for a 1000cc air cooled 2V twin, but still somewhat behind the competing 1000cc water cooled 4V twins that it lines up against. I guess thats been the Supersport thing since day one less power, made up for in other areas. How that still applies depends how you look at it. Still better than a Guzzi or Buell at least (if thats any consolation).