| Author |
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Alex
| | Posted on Thursday, November 24, 2005 - 06:23 am: | 
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Spatten,
we have a drag bike with 1570ccm (which is way below 2 liters) with XB heads. Ok, it is a Sportster with a slightly longer wheelbase but hey it still eats the Busas and runs a 9.600 on the quartermile 
Best regards
Alex |
Blake
| | Posted on Thursday, November 24, 2005 - 09:36 am: |
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VR,
That is a pretty simply calculation actually, but we would need a bit more info, specifically we would need to know the location of the bike/rider center of mass relative to the ground and the rear axle. The V-Rod also has an advantage in that it provides a lower center of mass and significantly lower seat.
The explanation is similar to the one I gave some time ago about the physics of a stoppie. Just replace "front axle" with "rear axle" and "decelleration due to braking" with plain ol' "acceleration." Then imagine the sketch to be one of a rider wheelying instead of stoppying. See if you agree. |
Liquorwhere
| | Posted on Thursday, November 24, 2005 - 03:10 pm: |
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Hmmm, this all seems interesting...and I can see definite logic in most every post, DC asked if anyone has done it, and actually, I have, but not on an XB9, my nine was gone when I raced the Rod, it was a 2003 silver VRod in Tampa. Lined up at the light, I went in second gear, lit up the tire off the line and by the time I hit fourth gear his "berries" had shriveled and he wanted no more. My XB12R has only a race kit and metzler Z6 tires. It was quite easy actually. I found that leaning on the front, tip toeing my feet, and using second gear at around 4500 RPM works quite well. Just my experience. |
Spatten1
| | Posted on Thursday, November 24, 2005 - 03:24 pm: |
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Liquor,
You make a great point about the launch. Getting the gear and RPM right is HUGE. |
Bobbyhead
| | Posted on Thursday, November 24, 2005 - 05:31 pm: |
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I notice all of you are still comparing a standard V-Rod against DC's XB9Sx. Like I said in my first post, a Street Rod ain't the same as a regular V-Rod. The Street Rod has more horsepower, better suspension, brakes and ground clearance, and it performs like a whole other animal, than a standard V-Rod. It really handles more like an older XL1200S, than the regular V-Rod. |
Cochise
| | Posted on Thursday, November 24, 2005 - 05:50 pm: |
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I imagine that most are using the "The Regular V-Rod can even beat the XB, so I know that a Street Rod could." answer. |
Redstar100
| | Posted on Thursday, November 24, 2005 - 06:01 pm: |
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One thing is that the V-rod has a better modern design motor then the buells ageing inferior motor.
(Message edited by redstar100 on November 24, 2005) |
Bobbyhead
| | Posted on Thursday, November 24, 2005 - 07:48 pm: |
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Just to make a Motor distinction between the V-Rod and Street Rod versions. Here are some specs taken directly from the Harley Website :
VRSCA(V-Rod) 115 H.P. & 74 ft.lb. Torq @ 7000rpm
VRSCR(StreetRod)120 H.P & 80 ft.lb. Torq @ 7000rpm
XB9SX (City-X) 92 H.P. & 70 ft.lb. Torq @ 5500rpm
Of course we all know that those Factory claimed H.P. numbers are exaggerated  |
M2nc
| | Posted on Friday, November 25, 2005 - 12:28 am: |
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Bobby, you are forgetting about weight. V-Rod or Street Rod are 630# give or take, an XB9s is 385#.
If you take the Hp/# figure of an XB and translate it to the Rods weight, you need 150hp to match.
The "Rods" advantage is being able to plant the HP to the ground off the line. So that negates allot of the XBs power to weight ratio advantage. I would do the same thing on my CB750 against this same XB. I could come off the line WOT at 5000rpm and be gone with no worry of lifting the front end. It would take my buddy to the eight mile mark to catch back up. The problem is that the V-Rod has 40hp more than a CB750, so catching up is going to be allot tougher.
I find that XB12 are a better match to "Rods" It has been my experience that the 12s can run down "Rods" even into triple digit speeds. Power-to-weight advantage is too great for an XB12. Even though it is even harder to launch, it can run a "Rod" back down.
Though I'll say it again, straight line an XB? Why? |
1badbuell
| | Posted on Friday, November 25, 2005 - 01:44 pm: |
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I have both 03 XB9 & 06 StreetRod...Rod is faster than a XB9 in a straight line (I haven't ridden a 12 to judge). I can carry a lot more speed on the XB through the corners. |
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