[Guest]

Hi

Got my bone stock S4R on the dyno today.

 

[Guest]

good stuff yannick! can't wait to see the "after" results.

 

[Guest]

Strati

What do you think of the graph, it's not the same shape of the graph on ducati's website ...

 

[Guest]

actually yannick, i think the shape is very similar. except the graph on ducati.com doesn't show the very beginning of the run or the very end. the shape of the main curve looks about dead-on:

the interesting thing though is that the torque and HP curves in your graph cross at about 7k RPM. hrm...

 

[Speeddog]

Yannick's graph looks funny because as near as I can tell, it's got (SAE Corrected) HP on the left side scale, and (SAE Corrected) Torque in N-m on the right side scale.

The Ducati graph has kW on the left side scale, and N-m on the right side scale.

Different units, different crossover points.........

 

[Hi_Fi_Guy]

I was under the impression that a HP and Tourque always crossed at 5250RPM. I'll have to look in some books. As noted above probably works like that when using one set of units and changes when the units are changed. Makes sense.

 

[Fillmore]

You're right, because HP is a function of torque times RPM divided by the constant of 5252, they have to cross at 5252 RPM.

Not sure what the formula for calculating kW is though.

--Fillmore

 

[Guest]

Easy. 1 KW = 1.34 HP

 

[Speeddog]

and 1 N-m = 0.7376 ft-lb.

Somewhere there's a thread on the S4R, along the lines of 'where's the beef?' I posted some graphs...

 

[mitt]

I looked in my books...

T=torque
n=rpm



power[KW]=
T[n*m]*n[rev/min]

 

[mitt]

Here are 2 graphs, same data, but 1 with common y axis and 1 with a secondary y axis.

 

[Skier]

wow mitt !

I never was good at mathematics, so I have great respect to who is !

Good stuff to share !

Skier