duncan
Expert Class
Posts: 341
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posted June 09, 2008 05:27 PM
30lb loss or 10hp gain
In the 1/4 mile if you took the same bike, rider, track, temp, etc., which would be quicker?
1. shave 30lbs off the bike
or
2. add 10hp to the rear wheel
  
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Wheelie
Needs a life
Old Man
Posts: 6902
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posted June 09, 2008 05:29 PM
I would say number 2. is this a trick question?
wee
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fish_antlers
Administrator
The Truth is Out There
Posts: 21895
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posted June 09, 2008 05:35 PM
c) "john denver"
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What business is it of yours where I'm from, Friendo?
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smokinzx14
Needs a life
Posts: 10197
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posted June 09, 2008 05:37 PM
10 hp is worth about a tenth of a second and 1 mph on my bike .... I have put on 15 pounds over the last year and lost about a tenth of a second .... So if i had to guess a 30 pound weight loss would be the winner ..
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Smokin Performance Cycles..
Tampa Bay , FL .. Brocks Performance Dealer ..
Gen 2 ZX14R Best ET 8.43 , Best MPH 164.95
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bigdtd
Needs a job
Interceptors
Posts: 4209
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posted June 09, 2008 05:38 PM
30 pounds off the rider!
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2006 Black ZX-14,6 inches over,16/42, flies out,BMC Street Filter,Brock's Street Meg,Brock's Radial Mount Strap,PClll with Race map,Dynojet LCD w/Techmount, ZX-14 fender eliminator,Pilot Power2CTs,Speedohealer,Pazzo Levers,Cox Radiator Guard, Garmin Nuvi 265WT
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fifth
Expert Class
The Magnificent Bastard
Posts: 303
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posted June 09, 2008 05:56 PM
just call me radio......
BOTH
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kawabunga
Expert Class
Cogswell Cogs Installed
Posts: 284
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posted June 09, 2008 06:23 PM
Less weight requires less torque to get the mass moving and less weight requires less horsepower to keep the mass moving. So all things being equal with the same HP & torque, less weight means quicker times and higher mph.
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bulldogprostock
Novice Class
Posts: 77
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posted June 09, 2008 06:37 PM
Lets look at the math: Bike and Rider weigh 750 lbs and the bike makes 150 hp.
Lose 30 lbs:
720 lbs bike/rider/etc. divided by 150 hp = 4.80 pounds per 1 horsepower.
Gain 10 HP:
750 lbs bike/rider/etc. divided by 160 hp = 4.68 pounds per 1 horsepower.
Give me the 10 horse's or better yet do both.
Lose 30 lbs and gain 10 hp:
720 lbs bike/rider/etc. divided by 160 hp = 4.50 pounds per 1 horsepower.
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2001 Busa, 2008 ZX14R, K6 GSX1000R
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Halvefast
Zone Head
Posts: 806
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posted June 09, 2008 07:02 PM
If you shave 30 lbs off the rider, you get much better results than off the bike.
Due to the fact you will lower the CG of the total package which will net much better ET's & Mph.
Ask anyone who has tried a drag seat if they noticed any difference,
exactly why Kawabunga's bike should ET pretty well into the 8's once they
get the set-up down and get to a good track.
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Texas Mile 200.256mph - Oct. 2007 (Update 202.577mph Oct 2008) NOS assisted
ECTA Ohio Mile 195.132mph
TexasMile 2012 199.9 mph all motor!
Streetriders Shootout 2008 series Pro/ET Champ!
Streetriders Shootout 2007 Series Pro/ET Runner-up!
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kawabunga
Expert Class
Cogswell Cogs Installed
Posts: 284
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posted June 09, 2008 07:07 PM
Acceleration is related to the power / weight ratio. Real numbers are as follows based on the above estimated weights and hp. The higher the calculated value, the faster it will accelerate. Not a lot of difference in 30lbs lost to 10hp gained.
150 HP
750 LBS w/ rider = .2 SUCKING HIND TIT
150 HP
720 LBS w/ rider = .208333 3RD PLACE BY A SPLIT HAIR
160 HP
750 LBS w/rider = .213333 2ND PLACE BY A SPLIT HAIR
160 HP
720 LBS w/rider = .22222 THE WINNER ( GAINED 10HP & LOST 30 LBS )
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kawasaki_1965
Parking Attendant
Bone Stocker
Posts: 27
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posted June 09, 2008 08:26 PM
 Edited By: kawasaki_1965 on 9 Jun 2008 21:28
Power to weight ratio is a big factor in faster acceleration.
Comparo factor: F-16 = single engine / F-15 dual engines-has more HP than the F16 ** F16 outperforms the F-15 by a significant margin due to the "power to weight ratio". 
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BlackMagic14
Needs a job
Posts: 2058
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posted June 09, 2008 08:51 PM
30 pounds. when I went on a diet I noticed a much bigger difference in ET not only that but I also notice a HUGE!!! difference when I put a skinny focker on my bike
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duncan
Expert Class
Posts: 341
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posted June 10, 2008 04:23 AM
Interesting...I would have thought the 30lb loss would have netted a winner in ET but a loser in MPH. But my question was which one is quicker so?????????????
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flatoutbu
Pro
Posts: 1054
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posted June 10, 2008 05:18 AM
Hmmm...well lets see. I weighed 230 in shorts last year with a best of 9.23 at 148. This year i weigh 175-180 in shorts and seen a best of 9.12 at 150. My 60's last year was alot better with 1.41-1.42, i havent had much practice this year with 60's in the 1.44-1.46 range. I think with some 60's as good or better (should) than last year i should see 9.0's....so i would guess 30 pounds is a tenth and 1 mph? Also that 9.23 was under best conditions and the .12 was not...so i might have a 8.90 in me.
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06 Blue 14
9.008 at 153mph @ 195 suited
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flatoutbu
Pro
Posts: 1054
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posted June 10, 2008 05:28 AM
I guess it all depends on your set-up...you can drop 30 pounds off the bike just by ditching the exhaust and putting on a drag seat.
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06 Blue 14
9.008 at 153mph @ 195 suited
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Halvefast
Zone Head
Posts: 806
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posted June 10, 2008 05:45 AM
OK I was wrong, I just ran the numbers thru the online dyno, here is what I got:
750lbs/ 150hp = 9.96et/ 136.8mph
720lbs/ 150hp = 9.82et/ 138.71mph
750lbs/ 160hp = 9.74et/ 139.8mph
BUT
720lbs/ 160hp =9.61et/ 141.7mph
(Source) http://www.amadragbike.com/Horsepower.asp
Hope this helps!
____________
Texas Mile 200.256mph - Oct. 2007 (Update 202.577mph Oct 2008) NOS assisted
ECTA Ohio Mile 195.132mph
TexasMile 2012 199.9 mph all motor!
Streetriders Shootout 2008 series Pro/ET Champ!
Streetriders Shootout 2007 Series Pro/ET Runner-up!
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CrotchRocket
Moderator
Bracket Racing with Betsy
Posts: 8038
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posted June 10, 2008 06:05 AM
Dropping the weight is cheaper than adding 10hp, depending on where the 10hp is coming from...If you have a stock bike and put an aftermarket pipe on then its all good, your getting the best of both!!!...If you already have a pipe and want to do motor work, forget it, it's way cheaper to drop 30lbs. for you and you'll physically feel better!!!
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Jason Miller StreetBike Seminars
*****DragRacers do it better, because they dont cut Corners*****
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flatoutbu
Pro
Posts: 1054
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posted June 10, 2008 08:59 AM
quote:
Dropping the weight is cheaper than adding 10hp, depending on where the 10hp is coming from...If you have a stock bike and put an aftermarket pipe on then its all good, your getting the best of both!!!...If you already have a pipe and want to do motor work, forget it, it's way cheaper to drop 30lbs. for you and you'll physically feel better!!!
I agree with that....if it takes motor work for another 10 hp your better off dropping the weight.
____________
06 Blue 14
9.008 at 153mph @ 195 suited
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Superman T
Pro
Posts: 1831
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posted June 10, 2008 09:24 AM
great point!
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Sticks_n_Stones
Needs a job
Posts: 3930
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posted June 10, 2008 10:42 AM
What if I like being fat and got money to burn??
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'06 zx14
Muzzy M10/M14
PCIII w/ Muzzy map
Flies out K&N in!
bits n pieces...
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bulldogprostock
Novice Class
Posts: 77
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posted June 10, 2008 04:00 PM
quote:
What if I like being fat and got money to burn??
Buy a Busa it'll match you ass!
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2001 Busa, 2008 ZX14R, K6 GSX1000R
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dubious
Needs a life
Needs more time to ride!
Posts: 8442
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posted June 10, 2008 04:02 PM
Thanks for the link halvefast....
although I don't think I'll ever acheive the results it gave me!
680 lbs, 450HP = 6.684 ET @ 203 MPH  LOL
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natural selection.....
destiny will overcome intervention.
Some are not worthy of the effort.
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ninja14
Pro
Posts: 1136
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posted June 10, 2008 07:10 PM
quote:
Thanks for the link halvefast....
although I don't think I'll ever acheive the results it gave me!
680 lbs, 450HP = 6.684 ET @ 203 MPH LOL
Lee could do it...if he were not a fat bastard now............he must be up to 130
I'd like like it as 15lbs off the rider and another 15lbs off the wheels/tires.
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2006 Turbo ZX-14.
2005 V-max 20th Anniv.
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Y2KZX12R
Needs a job
CompetitionCNC.com
Posts: 3762
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posted June 11, 2008 02:03 AM
As far as 1/4 mile times and acceleration, 7 lbs = approx. 1 hp.
Loosing 30 lbs is like gaining 4.3 hp
And gaining 10 hp is like loosing 70 lbs
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Y2KZX12R
CompetitionCNC.com
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flatoutbu
Pro
Posts: 1054
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posted June 11, 2008 05:11 AM
680 suited 9.12@149=177hp? hmm... my bike made 190 hp on Schnitz dyno which would be a 8.91@152 That sounds that better too me..
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06 Blue 14
9.008 at 153mph @ 195 suited
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