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Dyno Power Output - rear wheel or engine?

RichUK

RichUK

2016-10-25 09:27:00 UTC

Mine is 2008 990SD

Has a different air box - possibly a Moto Hooligan but hard to tell from the underside.
Akra slip-ons, cat is gone, as are the O2 sensors and pair valves
Power Commander 3 and she's been mapped on a Dyna Pro rolling road.

The figures are,
max power 121.22 bhp @ 8949 rpm
max torque 75.69 Ft/lb @ 7824 rpm

Air temp 30.6 degC
Air pressure 1001.3 mBar
DIN 700200 C/F: 1.03
Humidity 16.6%
RAD 93.09%

So are those figures rear wheel power or engine power?

Rich.

Sarasota_Steve

Sarasota_Steve

2016-10-25 12:00:00 UTC

Looks like RWHP.

RichUK

RichUK

2016-10-25 13:35:00 UTC

aww, I hope so.. that should mean she's over 130 at the crank.

bic_bicknell

bic_bicknell

2016-10-25 14:56:00 UTC

I think that nearly all Dynos available to mortals like us are measured at the rear wheel. If it was done on a rolling road then the machine measures the torque and power transferred to that rolling surface during the session. I'm no authority but surely measuring HP at the crank is only possible by taking the reading from the engine direct before it's gone through the gearbox and drive-chain (which both sap power) and I've never seen a dyno set up to do this.

Anyway your map and power figures are consistent with rear wheel figures averaging on this forum for the bike specs you give.

RichUK

RichUK

2016-10-27 00:23:00 UTC

Those look like numbers for the "R" version in 2008. I was doing some looking around for a guy on another forum and a bike rag said the 2008 SDR had 16 more hp than the non R for that year

Gimlet

Gimlet

2016-10-27 08:27:00 UTC

Yeh, that what I though... and that mine is now more or less the same power as an R now.
Probably get similar gains to the R by doing the same upgrades also.