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TECHNICAL => F.A.Q => Topic started by: NICKSLICK on November 28, 2002, 05:55:00 PM

Title: WEIGHT/HP RATIO?
Post by: NICKSLICK on November 28, 2002, 05:55:00 PM: If i weight 245lbs in full leathers, and my bike puts out 200HP, then how much would a rider have to weight on a stock bike (165HP) to accelerate at the same speed?

What is the formula?
Title: WEIGHT/HP RATIO?
Post by: THEMOTORHEAD on November 28, 2002, 06:26:00 PM: YA HAVE TO KNOW THE WEIGHTS OF BOTH BIKES
Title: WEIGHT/HP RATIO?
Post by: NICKSLICK on November 28, 2002, 06:27:00 PM: What is the formula?

For the sake of discussion, lets say both bikes weighed exactly 550lbs.
Title: WEIGHT/HP RATIO?
Post by: THEMOTORHEAD on November 28, 2002, 06:29:00 PM: EXAMPLE 1
COMBINED WEIGHT 700#
HP 175
THATS 4 # PER HP
Title: WEIGHT/HP RATIO?
Post by: Jebakaturbogsxrpilot on November 28, 2002, 06:31:00 PM: 100 lbs!!!If all else is equal!!! (http://images/smiles/icon_smile.gif)
Sorry forgot to add the bikes in!!!
Title: WEIGHT/HP RATIO?
Post by: NICKSLICK on November 28, 2002, 06:32:00 PM: So if I race a stock bike with a rider that weights 135 lbs, we should accelerate equally, all other things being equal?

THATS INTERESTING... if correct.

Is there a formula that you could plug in different numbers and get an answer?

[fat ass factor (bike1)] + [bike weight (bike1)] / [AMOUNT OF MONEY SPENT ON BIKE (bike1)] x the hypotanuse of a right angle X [JENNY CRAIG FACTOR (bike2)] + [bike weight [bike1]) = X (Where X is the amount of asskicking bike 1 will administer to bike 2 in a roll on)

(http://images/smiles/converted/drink.gif) (http://images/smiles/converted/drink.gif) (http://images/smiles/converted/drink.gif)
Title: WEIGHT/HP RATIO?
Post by: THEMOTORHEAD on November 28, 2002, 06:34:00 PM: ALSO A CRUCIAL FACTOR IS HP AVERAGE(WITHIN THE OPERATING RPM
THIS IS WHERE DYNO AND REAL WORLD SCREWS PEOPLE UP
ALWAYS GOP FOR EVG HP WITHIN AN RPM RATHER THAN MORE HP ONLY IN A SMALL WINDOW
THIS IS WHAT MESSeD WITH BYRON ON THE BIG HARLEY PROSTOCK(HE ALREADY KNEW BUT THE TRACK PROVED HIM CORRECT)
Title: WEIGHT/HP RATIO?
Post by: THEMOTORHEAD on November 28, 2002, 06:37:00 PM: somebody trying to race you (http://images/smiles/icon_biggrin.gif)
Title: WEIGHT/HP RATIO?
Post by: NICKSLICK on November 28, 2002, 06:38:00 PM: (http://images/smiles/converted/1.gif) (http://images/smiles/converted/1.gif) (http://images/smiles/converted/1.gif) (http://images/smiles/converted/1.gif)
Title: WEIGHT/HP RATIO?
Post by: Jebakaturbogsxrpilot on November 28, 2002, 06:44:00 PM: Yes Nick there is a formula, I am not sur exactly what it is! Here is what I did, after I added the bikes weight in!

Nick's Bike = 550
Nick= 245
Total= 795
Hp= 200
795/200=3.975 same as what Dennis got!

Danno's Bike= 550
Danno= 100
Total= 650
Hp= 165
650/165= 3.93 close enough!!! (http://images/smiles/icon_smile.gif)
Title: WEIGHT/HP RATIO?
Post by: THEMOTORHEAD on November 28, 2002, 06:47:00 PM: nick 245
danno 100
danno whips him on bike
nick whips danno for whippin his bike
Title: WEIGHT/HP RATIO?
Post by: Jebakaturbogsxrpilot on November 28, 2002, 06:56:00 PM: New scenario!!!!!

Nick's Busa= 550
Nick= 245
Total= 795
Hp= 200
795/200=3.975 lbs per Hp

Danno's Busa= 550
Danno= 250 w/ titanium rods!
Total= 800
Boost's Turbo add on Hp= 400
800/400=2lbs per Hp
Danno wins Hands down!!!!! (http://images/smiles/icon_smile.gif)
Title: WEIGHT/HP RATIO?
Post by: Twisted on November 29, 2002, 04:19:00 AM: quote:
Originally posted by NICKSLICK:
If i weight 245lbs in full leathers, and my bike puts out 200HP, then how much would a rider have to weight on a stock bike (165HP) to accelerate at the same speed?

What is the formula?
Nick isnt there a simple way to deal with this weight? the added weight may provide extra traction and help keep the front end dowm if placed properly? cant you lower the gears to make up for the extra weight? say your bike does 167 in the 1/4 shouldnt your bike be geared to be just approaching rev limiter, as it hits 167 in 6th gear? play with it, then lay down and hook that fucker up, shouldnt matter what he weights?
Title: WEIGHT/HP RATIO?
Post by: NICKSLICK on November 29, 2002, 12:14:00 PM: Its funny, I posted this up there, and EVERYBODY assumed I was talking about me and danno at the drag strip.

I wasnt...

I was curios of there was some kind of formula for figuring shit like this... hell, it doesnt even need to be a bike... it could be cars, planes, what ever...

I was just curios...
Title: WEIGHT/HP RATIO?
Post by: Twisted on November 29, 2002, 12:23:00 PM: you are going to race, arent you?
Title: WEIGHT/HP RATIO?
Post by: Steve A on November 29, 2002, 01:54:00 PM: In cars - in the 4,000 lb. range - 90 to 110 MPH range - 100 lbs. = about a tenth.
Title: WEIGHT/HP RATIO?
Post by: DarkFalcon on November 29, 2002, 02:08:00 PM: This is better than the formula:

http://www.web-cars.com/math/qtr_mile.html (http://www.web-cars.com/math/qtr_mile.html)
Title: WEIGHT/HP RATIO?
Post by: Steve A on November 29, 2002, 02:16:00 PM: According to that site - a 785 bike and rider needs 231 HP to run a 9.50 ET.

My "66" 426 Hemi ran a best ET of 12.42 - according to that site it made 526 HP. Wow.
Title: WEIGHT/HP RATIO?
Post by: DarkFalcon on November 29, 2002, 03:29:00 PM: The MPH are very good approximations while the ET's run high........at least for bikes.
Title: WEIGHT/HP RATIO?
Post by: Steve A on November 29, 2002, 03:34:00 PM: According to that site - 785 lb. bike and rider - 160 Hp = 10.8 @ 138. I think that is a little pessimistic but you can't factor in driver/rider skill in a formula.
Title: WEIGHT/HP RATIO?
Post by: Jebakaturbogsxrpilot on November 29, 2002, 05:54:00 PM: quote:
Originally posted by NICKSLICK:
Its funny, I posted this up there, and EVERYBODY assumed I was talking about me and danno at the drag strip.

I wasnt...

I was curios of there was some kind of formula for figuring shit like this... hell, it doesnt even need to be a bike... it could be cars, planes, what ever...

I was just curios...
I was only joking with ya Nick about the Danno part of the equation!! (http://images/smiles/icon_smile.gif)
Title: WEIGHT/HP RATIO?
Post by: THE ICE MAN on November 29, 2002, 07:43:00 PM: assuming riders are eqaul skills with the same power curve, the rider with 165 HP will have to be 70-100#'s based upon a 4-5 lb per hp figure.
so if someone out runs you thats 175+ in wieght
with a pipe and pc, you know what to do!
ricky gadson drag racing school comming to a town near you! for starters (http://images/smiles/converted/lmao.gif)
Title: WEIGHT/HP RATIO?
Post by: L.A. Don on November 29, 2002, 08:34:00 PM: You are all wrong! (http://images/smiles/converted/lol.gif)
Title: WEIGHT/HP RATIO?
Post by: DarkFalcon on November 29, 2002, 09:41:00 PM: sure.... (http://images/smiles/converted/lol.gif) (http://images/smiles/converted/lol.gif) (http://images/smiles/converted/lol.gif)
Title: WEIGHT/HP RATIO?
Post by: DarkFalcon on November 29, 2002, 09:43:00 PM: sure.... (http://images/smiles/converted/lol.gif)