A friend of mine at a shop recently dyno'd a 2006 VRXSE V-Rod Destroyer (http://www.harley-davidson.com/wcm/Content/Pages/Racing/vrxse_destroyer.jsp?bmLocale=en_US). He adapted a stock V-Rod rear wheel to the bike so that he could use a street tire on the dyno and not shred the slick that comes on there stock. He spent two hours tuning it with the Race Tuner. No other mods were made to the bike.

http://www.chrishajer.com/bike/XLF/destroyer.jpg

--Chris

as impressive as that is...its so damn expensive.

$31,249

The only thing impressive to me is how close it is to being tuned right out of the box.

--Chris

Hi guys

I'm an idiot. Can someone explain to me why the torque reading is so much lower than the horsepower?


On my bike the readings are flipped.
87 HP and 102 TQ

just a guess...multvalve head engines lose some torque in the bottom end due to more valves and larger intakes but are way more efficient at top end of rpm scale
had two vw's one was an 8valve the other a 16valve both 1987 jetta gli's.
the 8v was punchy down low but had no top end, the 16v was soft down low but screamed to 7200rpm and was easy to do 135mph

as impressive as that is...its so damn expensive.
I agree, you can buy a Hayabusa for $9,500 new with the same power, and ride it anywhere.

I agree, you can buy a Hayabusa for $9,500 new with the same power, and ride it anywhere.


out the door is actually closer to high 13k. a friend just bought one.

I agree, you can buy a Hayabusa for $9,500 new with the same power, and ride it anywhere.

I think Big Ben from the Steelers has one for sale! "Slightly used!"

Chris,

Some magazine said that the destroyed is jetted too rich and can make some better power with tuning. Is that true? Also, that afr seems to be all over the place. What is up with that?

The AFR is not really all over the place: I just reduced the scale so you could actually see it. The normal range on that graph is 10.0 - 18.0, so all you see is a little line in the middle. I figured higher resolution would show it better. It's a pretty normal variation.

This one made about 4 HP and 6 ft lbs more torque with tuning. The AFR was way rich in the midrange before tuning. That bump in torque is huge from 6K to 9K RPM.

--Chris

out the door is actually closer to high 13k. a friend just bought one.
I just sold one (a 05) it was 9850 out the door fron Hinds Motorsports in Delaware,Ohio when I bought it.

I just sold one (a 05) it was 9850 out the door fron Hinds Motorsports in Delaware,Ohio when I bought it.


holy crap, we're in philly burbs. ill send him to ohio next time.

msrp on busa is 10,899.

That VRXSE is so cool. I haven't seen one in person yet but I'd love to drool over it for awhile. Impressive numbers indeed.

However, my sporty also makes me happy so I don't need a VRXSE, yet...

Thanks for posting the dyno

It is an extremely cool bike. Expensive, but still pretty cool.

--Chris

It is an extremely cool bike. Expensive, but still pretty cool.


Now make it street legal and keep the same power with an MSRP of 15-20K and it will be an accomplishment.

Now make it street legal and keep the same power with an MSRP of 15-20K and it will be an accomplishment.


yeah, thats gonna happen:roflblack

Now make it street legal and keep the same power with an MSRP of 15-20K and it will be an accomplishment.

lol... 15-20k is the price range for the normal v-rod line... good luck gettin a destroyer street legal for that range:roflblack

Since all of the motor parts on that bike are available from the MOCO what's to keep someone from putting them on a street registered bike? They have to have repair parts for something like that. That would make one hell of a street racer.

they want 30 grand for the bike... thinking of what they'd charge for the parts scares me

The fact that the factory is producing a "race" version of a bike is pretty cool to me. Forget the fact that it's not street legal, costs more money, etc. It's a little bit of a throwback to the late 60's/early 70's when Ford/Chev/Mopar were producing the barely legal factory racecars (Galaxie Lightweight, etc). I applaude Harley for the effort :).

Chris,

Although the gains in peak hp and tq form tuning were minimal, that gain the the entire midrange is HUGE from only tuning. In all honesty I am shocked that HD can not get the tuning closer to perfect on a bike that is for drag racing purposes only.

holy crap, we're in philly burbs. ill send him to ohio next time.


Hinds is constanlly beating prices on stuff. My buddy bought a couple of quads from them last year. They beat everyone by almost 2k.

Chris,

Although the gains in peak hp and tq form tuning were minimal, that gain the the entire midrange is HUGE from only tuning. In all honesty I am shocked that HD can not get the tuning closer to perfect on a bike that is for drag racing purposes only.
It's not bad for out of the box. It comes with the Race Tuner and I think they figure people are going to modify them anyway, so why spend more time on it? Let the tuners tune.

--Chris

Hinds is constanlly beating prices on stuff. My buddy bought a couple of quads from them last year. They beat everyone by almost 2k.
two other friends have honda cbr600RR both payed near 12,000(after finance charges and other stuff they tack on)

Hi guys

I'm an idiot. Can someone explain to me why the torque reading is so much lower than the horsepower?


On my bike the readings are flipped.
87 HP and 102 TQ

Jimmy. If you look at the RPM range on that chart it's all 5250 RPM to 9500
RPM. The chart on your bike will show the flip which is always under 5250 RPM
down to about 2000 RPM.
In other words, your numbers will flip over 5250 as well. 5250 is the chosen
point that an engine starts making serious HP.

Chris,
Something else just came to mind. I bet that the dyno was done at Illinois Harley. Isn't that a low reading dyno? So the peak horsepower can actually read higher on a different dyno?

horsepower = rpm x torque / 5252

torque = 5252 x horsepower / rpm


That is why a dyno sheet from idle to above 5252 rpms will show the two curves crossing at that specific rpm.

Chris,
Something else just came to mind. I bet that the dyno was done at Illinois Harley. Isn't that a low reading dyno? So the peak horsepower can actually read higher on a different dyno?
Yes, it was at Illinois HD, and yes their dyno reads about 7% low compared to other area dynos. Theirs is a Dynojet model 150, converted to a 250 with the load control.

--Chris

Yes, it was at Illinois HD, and yes their dyno reads about 7% low compared to other area dynos. Theirs is a Dynojet model 150, converted to a 250 with the load control.

--Chris

Hey, good deal.... I had my bike dyno'd at Illinoiss... woo! 7% increase in power, woo! :banana

horsepower = rpm x torque / 5252

torque = 5252 x horsepower / rpm


That is why a dyno sheet from idle to above 5252 rpms will show the two curves crossing at that specific rpm.
Exactly. The dyno can only measure torque though, and has to figure out HP.

HP = (torque x RPM) / 5252

Is that the same thing? I think so... :D :laugh

Why is the magic number 5252, as long as class is still in session?

--Chris

Hey, good deal.... I had my bike dyno'd at Illinoiss... woo! 7% increase in power, woo! :banana
Free horsepower - nothing like it!

I just use a crayon to draw the line 7% higher on all my graphs. Makes me feel better.

--Chris

Exactly. The dyno can only measure torque though, and has to figure out HP.

HP = (torque x RPM) / 5252

Is that the same thing? I think so... :D :laugh

Why is the magic number 5252, as long as class is still in session?

--Chris

HP = Torque x RPM / factor

HP = (ft*lb) * (rev/min) / factor

HP = ft*lb*rev*(2 pi radian / rev) * (min / 60 s) * (1 HP / 550 ft*lb/s) / factor

Basically, its a lumping of converting all the units: you'll end up with

factor = 5252 becuase

5252 = 60 * 550 / 2pi

which is the conversion from revolutions to radians, minutes to seconds, and ft*lb per second to HP all thrown together in one lump


EDIT: OK, thats almost impossible to follow as text... maybe I'll throw it up in "pretty print" later when i have time for anyone who's interested.

I agree, you can buy a Hayabusa for $9,500 new with the same power, and ride it anywhere.

But that Hyabusa is not NHRA AHDRA legal out of the box. Not for the ETs it would turn in.

they are amazing...watched dozens of runs....that busa dont sount like the detroyer...what a machine mid 9's all day long off the trailer then put away warm....wow.

They have one on display at Chester's HD in Mesa. Very Cool Bike. Makes me want a v-rod. I'll bet that wheelie bar sucks in the twisties though.
DC

Not knocking the Harley by any means, but can it do this for 1/3 the price? BTW, don't know what bike it is, I assume it's a Busa because there is another one in the vid.

http://media.putfile.com/Motorcycle-at-220MPH

Not knocking the Harley by any means, but can it do this for 1/3 the price? BTW, don't know what bike it is, I assume it's a Busa because there is another one in the vid.

http://media.putfile.com/Motorcycle-at-220MPH


Nice Video. Check out the lines on the road. NO WAY is that bike running 220 MPH :roflblack Also I once heard that a Busa will begin to lift the rear tire off the road at over 200 mph....don't know if that is true or not, but that is what I heard.

Nice Video. Check out the lines on the road. NO WAY is that bike running 220 MPH :roflblack Also I once heard that a Busa will begin to lift the rear tire off the road at over 200 mph....don't know if that is true or not, but that is what I heard.

I don't agree with the lines. I have recorded going over 100 MPH in my car and it looks like 35 because the camera's shutter speed is different than what your eyes are.

As far as the rear tire comes off the ground, I don't know if that's true or not. Only experience I had was going 145 on my FZR and having the front tire come off the ground. That's leaning forward.

Oh, yeah, almost forgot, generally, most Jap bikes have 10% error in them anyway. So, 220 would be less than 200 MPH. Still quite possible.

the v-rod engine has a short stroke with large bores like sport bikes. the longer the stroke the more torque that is made.