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TOPIC: Estimated Rear Wheel Horsepower

Estimated Rear Wheel Horsepower 5 years 1 week ago #1

This is another topic with lots of speculation.

There have been conversations about a 20% loss of power due to the shaft drive.

In order to understand losses of a current generation shaft drive system, lets compare the numbers to the Yamaha FJR1300 which has a very similar setup - not identical, but close enough for a good comparison.

The FJR1300 is speced at 146hps at the crank. When you check out dynocharts of a stock FJR you will get about 127rwhps.

Find the Dyno Chart here: fjr1300.info/images/DynoChart.jpg
Other test results here: www.motorcyclistonline.com/roadtests/200...a_fjr1300/index.html

That represents a 13% loss from crank. If you apply that for comparison to the claimed 197.4hps for the VMax you get an estimated 171rwhps as well as about 106ftlbs of torque at the wheel.

I could not find a trust worthy dyno sheet of a stock B-King. None of the magazines seem to have one up. Would be interesting for comparison. However, I was surprised to see an even smaller fuel tank of 3.6 gallon on the Burger King.
Just for reference the B-King is rated at 181hps and 109ftlbs of torque. With an estimated 10-12% losses that should take it to about 161rwhps and 97ftlbs of torque at the wheel.
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Re:Estimated Rear Wheel Horsepower 5 years 1 week ago #2

I know the new V-Max is going to have it's hands full trying to beat the '08 Busa. It just set the new Cycleworld record for fastest production 1/4 mile at 9.70 at 148.4mph. It dynoed 173.4 rwhp and 103.9ftlbs torque. It weighs 585lbs wet. So we have to give up 100lbs right off the bat. I think it will be pretty close. That V-Max torque is so AWESOME leaving the line. I am hoping the extra torque and the longer wheel base will make the V-Max come out on top. It is such a tricky thing trying to get a inline-4 with tall gearing to run 190mph off of the line. The V-Max will be so much more user friendy coming off the line. Oliver I bet you are very close in your numbers. I am not sure about the huge loss in torque. I am not sure if the 13% number will apply with it or not. Torque is a hard one to measure. I know alot of it is GOOD!! My official guess will be 173rwhp and 118 ftlbs of torque. Enough to make you smile!!!:cheer: :cheer: :cheer:
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Re:Estimated Rear Wheel Horsepower 5 years 1 week ago #3

I've heard that the reddish brown oem parts on the new Vmax
(cam covers, etc..) are made of magnesium.

I just read an article stating that magnesium will be used more in auto and car designs to reduce weight.

So what is lighter the billet cam covers or the magnesium?

The New VMAX performance will be hampered by excess weight regardless of RWHP or torque.

Also, can we order the new VMAX with the billet or do we have to buy the accessories from star and install after we have received the bike?
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Re:Estimated Rear Wheel Horsepower 5 years 1 week ago #4

92vmax wrote:
Also, can we order the new VMAX with the billet or do we have to buy the accessories from star and install after we have received the bike?

Bling goes on AFTER you get the bike. By yourself, someone you know or the dealer.

I can't wait to see what a different exhaust and a PCIII can do to this thing. It will most likely drop 30 some pound like on many Yamaha/Stars. If this engine really was detuned so much, it should open her up quite a bit. Wonder who will be the first to post 200+ rwhps numbers on that machine - if its possible at all.
Most Star's you can get to slightly above the claimed crank numbers straight to the wheel with simple Big Air Kits and exhaust. Its not going to be that easy with Mr.Max, as the intake system seems already very refined, but who knows.

For example: The Warrior with a claimed 85hps at the crank, will make up to 90rwhps with a BAK, a Propipe and a custom mapped PCIII
The XV1900 Roadliner/Midnight Star has a claimed 101 hps at the crank. With a custom mapped PCIII, a good exhaust like the V&H and the Patrick Racing BAK will get you to right around 100 rwhps.
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Re:Estimated Rear Wheel Horsepower 5 years 1 week ago #5

The FJR final Drive is the as the old Vmax. 13 Percent Loss is standard on these Units.

I believe, you can expect the new final Drive with under 13 Percent Loss. That's because they changed the overall Gearings to make the new final Drive smaller. Which means much more Revelations at lower Torque on Gears and Bearings. If they got it right, i would guess the Loss under 11 Percent on this Setup.
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Re:Estimated Rear Wheel Horsepower 5 years 1 week ago #6

Squeeze wrote:
The FJR final Drive is the as the old Vmax. 13 Percent Loss is standard on these Units.

I believe, you can expect the new final Drive with under 13 Percent Loss. That's because they changed the overall Gearings to make the new final Drive smaller. Which means much more Revelations at lower Torque on Gears and Bearings. If they got it right, i would guess the Loss under 11 Percent on this Setup.

Interesting. Might be the reason why CycleWorld is estimating 175rwhps...
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Re:Estimated Rear Wheel Horsepower 5 years 1 week ago #7

I HAVEN'T HAD A CHANCE TO LOOK INTO ANY MAGIZINES ARE THERE ANY PICTURES OR ARTICALS ABOUT THE NEW VMAX WITH EXCEPTION TO THE ONE WHICH BROKE THE NEWS I THINK IT WAS CRN????SORRY IF THIS IS WRONG
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Re:Estimated Rear Wheel Horsepower 5 years 1 week ago #8

I was at a dyno night watching when a B-King was put up on the rack. It pulled 170hp even, I couldnt get the torque cause people were climbing on my back and stuff

You just cant outrun ugly though.
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Re:Estimated Rear Wheel Horsepower 5 years 6 days ago #9

My buddie dynoed his B-King, with an exhaust change only, no power commander nothing he dynoed at 177/104.
Fxstein, you are so clever at evading the B-King. You always try to lower what it is. Your quote on not being able to find accurate numbers is pure non-sense.
Those numbers are everywhere. You just don't want to write them.
Its a naked Busa for cryin out loud. A 1340 stroker, 16 injectors, titanium valves, 32 bit processor and nearly 10 years of fuel injection usuage prior for total linear power to perfection.

Get with it and back off on the promotion of Yamaha like there is no other.

For crying out loud, guys like you are a dime a dozen. Open your eyes and see what is out there.

Sure you can call the King ugly, but you don't see it long enough to call it anything but gone. Its what the V-max should be, and then some.

Yamaha has neutered the Max so bad its embarassing to talk about. If you are half the enthusiast and a knowledgeable bike person you of all people should help to promote moving forward in technology rather then backwards.
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Re:Estimated Rear Wheel Horsepower 5 years 6 days ago #10

Falcon it will all be OK. Just go get on your B-King and relax. I know Yamaha could have done a little better on a few details. But I for one will be very happy with my new V-Max. You said it yourself it does look cool!! Also we haven't even got to ride it yet. It may be quicker than you think. We are all just motorcycle guys trying to enjoy our passion. It don't matter what color or make. We all love two wheels. Oh by the way I don't know where your name Falcon derives from but I train Hawks and Falcons as another hobbie.
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