Factory Horsepower/Torque Data

[flyp3]

Having done some basic web searches and checked out both the FJR owner and service manuals, I haven't had much luck finding specific factory numbers on the "crank" horsepower/rpm and torque/rpm data. I see plenty of mention of a gross 145 horsepower figure in advertisements but nothing more specific.

Its easy to find magazine tests and dyno ratings for wheel horspower/torque, but specific factory numbers seem to be a little more difficult to find. Help anyone?

Thanks

 

[TheBlueStreak]

I have engine crank figures of 145 HP @ 8000 RPM & 99 ft-lbs of torque @ 6800 RPM. The wheel numbers are 127 & 75, respectively.

 

[Fred W]

Having done some basic web searches and checked out both the FJR owner and service manuals, I haven't had much luck finding specific factory numbers on the "crank" horsepower/rpm and torque/rpm data. I see plenty of mention of a gross 145 horsepower figure in advertisements but nothing more specific.
Its easy to find magazine tests and dyno ratings for wheel horspower/torque, but specific factory numbers seem to be a little more difficult to find. Help anyone?

Thanks

"Factory numbers" are pretty worthless given that they are subject to the "overview" of the marketing department. OTOH, the dyno charts are going to give you actual empirical data. Granted, it will be only one sample, for that particular machine at that particular state of tune, in that particular environment, etc. But one factual data point is worth more than all the sales puffery in the world. And if you can find multiple dyno-strip data points you can find your own mean values.

 

[RonC]

The Dyno charts I've found on the web show HP varying from 120-131 and the torque from 87-91, both at the wheel.

Ron

 

[Fred W]

The Dyno charts I've found on the web show HP varying from 120-131 and the torque from 87-91, both at the wheel.
Ron

Seems pretty likely to me. Variations of the dynos. Variations of the bikes. 10% variation isn't too much to expect.

 

[C&C]

I have engine crank figures of 145 HP @ 8000 RPM & 99 ft-lbs of torque @ 6800 RPM. The wheel numbers are 127 & 75, respectively.

I've seen these figures as well. Knowing that they are (factory quoted numbers), at engine, not rear wheel, I've still succinctly extrapolated that the figures really mean, 'more than adequate'.

 

[flyp3]

Thanks for the info.

I think I'll go with the following data:

CRANK HP- 145.0 @ 8500 RPM/99.0 FT/LB TORQUE @ 6800 RPM (factory)

WHEEL HP- 124.5 @ 8500 RPM/90.2 FT/LB TORQUE @ 6800 RPM ("Rider Magazine" dyno 12/07)

 

[greg97224]

My 07 dynoed at 121hp and 90 on the torque. I was a little dissapointed on the horse power numbers.

 

[ionbeam]

My 07 dynoed at 121hp and 90 on the torque. I was a little dissapointed on the horse power numbers.

That hp number is about correct with 145 hp at the crank.

A 12%-15% HP loss for a shaft drive is typical. Expect only 5%-7% loss for a chain drive.

 

[RadioHowie]

My 07 dynoed at 121hp and 90 on the torque. I was a little dissapointed on the horse power numbers.

That hp number is about correct with 145 hp at the crank.

A 12%-15% HP loss for a shaft drive is typical. Expect only 5%-7% loss for a chain drive.

Depends on which chain....

5%-7% loss from the chain out back.....99%-100% loss from the chain up front -- when it's frigged!

Right, Alan?

 

[Fred W]

My 07 dynoed at 121hp and 90 on the torque. I was a little dissapointed on the horse power numbers.

That hp number is about correct with 145 hp at the crank.

A 12%-15% HP loss for a shaft drive is typical. Expect only 5%-7% loss for a chain drive.

Depends on which chain....

5%-7% loss from the chain out back.....99%-100% loss from the chain up front -- when it's frigged!

Right, Alan?

You're gonna get coal this year Howie...

 

[ionbeam]

My 07 dynoed at 121hp and 90 on the torque. I was a little dissapointed on the horse power numbers.

That hp number is about correct with 145 hp at the crank.

A 12%-15% HP loss for a shaft drive is typical. Expect only 5%-7% loss for a chain drive.

Depends on which chain....

5%-7% loss from the chain out back.....99%-100% loss from the chain up front -- when it's frigged!

Right, Alan?

Hey, I resemble that remark! Let me assure you that there is no ~1% involved -- power loss is absolutely 100%. Apply your deep insight and riddle me how the 'front chain' can be intact, the cam and crank gears appear to be ok, yet the chain is off the crank gear The chain is toast though (along with just about every other moving part of the engine).

As far as Howie getting coal -- he is forgiven if he sends it my way 'cause I just got a $800 fuel oil fill today and I do have a cast iron coal stove (wood stove look-alike) that needs to be returned to service.

 

[Bounce]

https://www.mcnews.com/mcn/technical/perf_index_0105_p3.pdf

test date 7/02 (gen 1)

120.7 rwhp

87.6 rwt

https://www.fjr-tips.org/maint/dyno/dyno.html

test date 12/04 (2003 gen 1 - w/pc3 & slip-ons)

131.24 rwhp

91.36 rwt

 

[Cdogman]

Daaayyyummmmmmm

I wanna Dyno Mine.. I bet I git 150 at 12 and 200 at 3

OK,, messin round

Mine is as fast as it needs to be..... I need a DIFFERENT bike to go faster than this little lady will take me. She HAULS ***!!!!

But she is not a repli bike

 

[Fred W]

https://www.mcnews.com/mcn/technical/perf_index_0105_p3.pdf
test date 7/02 (gen 1)

120.7 rwhp

87.6 rwt

https://www.fjr-tips.org/maint/dyno/dyno.html

test date 12/04 (2003 gen 1 - w/pc3 & slip-ons)

131.24 rwhp

91.36 rwt

Quick question: Does anyone know what the bump at 5k rpm is caused by?

 

[Flyguy]

My 07 dynoed at 121hp and 90 on the torque. I was a little dissapointed on the horse power numbers.

Remember, the first thing to look at when having the bike dynoed is the barametric pressure and temperature at the time it is being tested. Ask the testing facility to "correct" the results to SAE standards (J1349).

As a quick example an FJR may produce 125rwHP on a typical day of 89 degrees and a barometric pressure of 29.60 inches of mercury. That same engine a week later after a front comes through would read 117 hp if it were 50 degrees and 30.10 inches! Altitude alone can cause large variations in pressure and consequently HP readings.

No doubt some of the huge discreptacies in numbers are from inconsistant application of these standards.