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post #1 of 27 (permalink) Old 11-13-2013, 07:48 PM Thread Starter
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Actual measured power

Good afternoon y'all, one of the local dealerships had a deal last weekend where dynojet had one of their trucks on site. Just for giggles (and the other stuff...) I decided to let them twist mine up to see what the real hp and torque numbers were. My question is more for the folks who have other bikes. I've seen multiple sites where the hp number was around 60 and the torque was somewhere around 47. I didn't believe the numbers represented rear wheel power when I read them and the dyno confirmed it. Have y'all experienced similar findings with other bikes?

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post #2 of 27 (permalink) Old 11-13-2013, 07:54 PM
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Clean numbers there.

Most of the time advertised hp/torque is measured at the flywheel, thus a good 10% higher than reality.

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post #3 of 27 (permalink) Old 11-13-2013, 08:42 PM
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Yes most factories report horsepower at the crank, while magazines like Cycle World dyno their test bikes and give rear wheel figures.

"Reported" horsepower for the Vulcan is 63 I believe. I think a member had his earshaved VN dyno'd and reported 53-54 HP.

My FJR listed a HP of 145, dyno runs by owners are in the 125-129 range.

Shaft drive bikes eat up a bit more power than chain drive bikes BTW.

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post #4 of 27 (permalink) Old 11-14-2013, 02:18 AM
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Quote:
Originally Posted by Knifemaker View Post
Yes most factories report horsepower at the crank, while magazines like Cycle World dyno their test bikes and give rear wheel figures.

"Reported" horsepower for the Vulcan is 63 I believe. I think a member had his earshaved VN dyno'd and reported 53-54 HP.

My FJR listed a HP of 145, dyno runs by owners are in the 125-129 range.

Shaft drive bikes eat up a bit more power than chain drive bikes BTW.
I think you are right knifemaker, my 750 had a little power loss up in the mountains loaded down with 60 lbs of camping gear last summer.
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post #5 of 27 (permalink) Old 11-14-2013, 02:22 AM
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I think you are right knifemaker, my 750 had a little power loss up in the mountains loaded down with 60 lbs of camping gear last summer.
Sure is nice to have the "Connie" now. I may take a trip this coming summer, sure is nice to have a 7.5 gallon tank and a thousand cc's.

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post #6 of 27 (permalink) Old 11-14-2013, 07:18 AM
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Quote:
Originally Posted by acisroc View Post
Sure is nice to have the "Connie" now. I may take a trip this coming summer, sure is nice to have a 7.5 gallon tank and a thousand cc's.
Well as most builders will tell you, if you're looking for more power,


There's no replacement for displacement........

My personal view is 900-1000cc is all a bike really needs.

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post #7 of 27 (permalink) Old 11-14-2013, 10:30 AM Thread Starter
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I was pretty happy with the numbers, I actually expected them too be lower because of drivetrain losses. Mine is earshaved and mildly jetted, so that seems like a consistent hp number.
I'm not as concerned with the HP number as the torque number. Add a hill and/or extra weight and she does tend to bog down.

Any feedback on what value there is in adding torque cones to the exhaust?

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NGK plug wires and iridium plugs
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post #8 of 27 (permalink) Old 11-14-2013, 11:50 AM
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Bog down? How big are you? My Vulcan with passenger and 60 lbs of luggage went up hills with no problem. Perhaps your jetting is a bit off, or you forgot you can downshift....

Not sure what "torque cones" are but sounds like they just constrict the exhaust...the bike as stock has a well tuned exhaust. Guessing torwue cones are for folks that run straight pipes....

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post #9 of 27 (permalink) Old 11-14-2013, 12:36 PM
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I did that 600mi trip with full luggage and my 250ish pound self, and had no issues. I always just downshift on hills and keep the RPMs over 4k. It is a Japanese engine so it's not afraid of mid-to-high RPMs

1986 Kawasaki Vulcan 750
NGK Iridium Plugs #7803/DPR7EIX-9
Duralast Gold ETX15 AGM Battery
Coastered & Shaved
TOC MCCTs
Metzeler ME880 [110/90-19, 170/80-15]
Balance Dampers Replaced
Tuxedo Mod
Rebuilt Forks w/ Progressive Springs
V&H Cruzers
VN750.com Grill Cover
Meanstreak Seat
Emgo 23-92411 Handlebars
MOSFET FH012AA R/R


1990 Kawasaki Vulcan 750

1998 Honda VFR800 FI

2014 Honda VFR800F

1989 Pontiac Firebird Formula 350
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post #10 of 27 (permalink) Old 11-14-2013, 03:34 PM
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Quote:
Originally Posted by thtanner View Post
I did that 600mi trip with full luggage and my 250ish pound self, and had no issues. I always just downshift on hills and keep the RPMs over 4k. It is a Japanese engine so it's not afraid of mid-to-high RPMs
BINGO!!! been saying that for a while now....lol

i think people are afraid to push the RPM on the VN750, but i swear this bike LOVES screaming above 4K RPM
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