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Author Topic: Theory, weight vs hp vs mph.  (Read 3667 times)

Offline Quijinn

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Theory, weight vs hp vs mph.
« on: February 24, 2006, 03:51:57 PM »
Looking so see what changes you have seen in your mph with changes you made.

Trying to get a idea, or rule of thumb per say of weight vs hp vs mph on bikes.

Something like 10 lbs or 2 hp= 1 mph.

I really wonder what the effects of weight on drag raceing bikes are, I suppose ET could be good to know, but that varies so much it might be hard to narrow it down.

I weight 230 now, want to get down to about 195 or so, so would 30 lbs be good for 3mph?

Ok lets see what you all think.
Hi my name is Mark and I am a Bikeaholic.     Be carefull how fast you race through life, the finish line is death, and the trophy is a headstone.  Our perspective is how we judge our lives, to judge others we need a little change in our perspective.

Offline GeorgeC

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Re: Theory, weight vs hp vs mph.
« Reply #1 on: February 24, 2006, 05:27:00 PM »
I've been told ~4hp = 1mph, and that seems to be pretty accurate going off of results I've personally had.  Can't help with the weight.

Offline LongR1

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Re: Theory, weight vs hp vs mph.
« Reply #2 on: February 24, 2006, 05:39:05 PM »
on zx12 i rode the owner was 200lbs and me 130lbs made up about .5 difference. cant remember mph but i think is was 6-7 mph difference
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Offline Chet

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Re: Theory, weight vs hp vs mph.
« Reply #3 on: February 25, 2006, 11:12:01 AM »
Some additional points

"Add lightness to improve performance"
Losing body weight is the cheapest and ultimately the best 1st move.
The location of the weight removed is also important.


Chet

Offline Quijinn

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Re: Theory, weight vs hp vs mph.
« Reply #4 on: February 25, 2006, 12:41:45 PM »
I agree on body weight. I am just trying to get a rough idea of these numbers from ppl that have made changes. Since I didnt dyno my bike before and after the changes I dont know for sure how many mph diff was made per hp. I am going to monitor the weght close and see what the difference is, and the hp from now on.
Hi my name is Mark and I am a Bikeaholic.     Be carefull how fast you race through life, the finish line is death, and the trophy is a headstone.  Our perspective is how we judge our lives, to judge others we need a little change in our perspective.

Offline kwackhead

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Re: Theory, weight vs hp vs mph.
« Reply #5 on: February 25, 2006, 02:14:31 PM »
I would say lowering weight in certain areas will help more than others.
 if you can lose 10 or 15 lbs of rotaional mass you''ll see more gains than losing the same on just mass.
 HP is lost through drive train, if you can improve drivtrain, more HP will get to the ground. plus losing overall weight.
Wheel weight, chain weight, non-oring, ceramic bearings, tire weight, synthetic oils, free up brake pads, etc.
 I heard 10lbs mass=1hp,  dunno if thats accurate.
« Last Edit: February 25, 2006, 02:16:03 PM by kwackhead »

Offline DaveO

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Re: Theory, weight vs hp vs mph.
« Reply #6 on: February 25, 2006, 02:16:49 PM »
12-13lbs per mph.....in 1/4

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Offline GeorgeC

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Re: Theory, weight vs hp vs mph.
« Reply #7 on: February 25, 2006, 08:35:51 PM »
12-13lbs per mph.....in 1/4

Dave

Dammit, I need to lose about 25 pounds so I can hit those 160mph trap speeds I want!!!  :o

Offline gnd111

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Re: Theory, weight vs hp vs mph.
« Reply #8 on: February 25, 2006, 09:25:53 PM »
12-13lbs per mph.....in 1/4

Dave

Dammit, I need to lose about 25 pounds so I can hit those 160mph trap speeds I want!!!  :o

Hooters tomorrow ain't gonna help... :lol:

Offline Quijinn

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Re: Theory, weight vs hp vs mph.
« Reply #9 on: February 25, 2006, 09:49:24 PM »
HAHAHAHAHA I got that same problem :)
Hi my name is Mark and I am a Bikeaholic.     Be carefull how fast you race through life, the finish line is death, and the trophy is a headstone.  Our perspective is how we judge our lives, to judge others we need a little change in our perspective.

Offline h82bbad

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Re: Theory, weight vs hp vs mph.
« Reply #10 on: February 26, 2006, 12:14:50 AM »
I weigh 230 and Hotrod weighs 135

on my bike he has ran 5.8's@126 I have went 6.2's @ 119
Before I was turboed he wasl about 4 tenths quicker than me and about 5 MPH better in the 1/8
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Offline zookman

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Re: Theory, weight vs hp vs mph.
« Reply #11 on: February 26, 2006, 04:47:32 AM »
I weigh 230 and Hotrod weighs 135

on my bike he has ran 5.8's@126 I have went 6.2's @ 119
Before I was turboed he wasl about 4 tenths quicker than me and about 5 MPH better in the 1/8

And i am not a better rider than you,it is strickly weight.Prime example.
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Offline h82bbad

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Re: Theory, weight vs hp vs mph.
« Reply #12 on: February 26, 2006, 11:23:14 PM »
he is bullshitting :D He is better than I am. There is a reason he calls me Grasshopper :D
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Offline cstraubs1

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Re: Theory, weight vs hp vs mph.
« Reply #13 on: February 26, 2006, 11:59:52 PM »
Buy a turbo,and eat whatever the fuck you want... :lol: :lol:

Offline tnfastbusa

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Re: Theory, weight vs hp vs mph.
« Reply #14 on: February 27, 2006, 12:09:11 AM »
that what I'm  saying  o shit i got hamburger grease on my key board  :mrgreen:

Offline h82bbad

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Re: Theory, weight vs hp vs mph.
« Reply #15 on: February 27, 2006, 12:39:02 AM »
Buy a turbo,and eat whatever the fuck you want... :lol: :lol:
I did...he is still faster than me :D
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Offline zookman

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Re: Theory, weight vs hp vs mph.
« Reply #16 on: February 27, 2006, 12:41:38 AM »
Naw,it's not like that.

 :lol: :P
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Offline Busashot

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Re: Theory, weight vs hp vs mph.
« Reply #17 on: March 01, 2006, 01:48:42 AM »
For average drag racers, 20-25lbs = .10 & 1mph. More realistic.


Offline da/man

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Re: Theory, weight vs hp vs mph.
« Reply #18 on: March 01, 2006, 01:52:48 AM »
I have heard that every 7 lbs is 1 hp
 1000's gone busa is here

Offline Commuta_Busa

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Re: Theory, weight vs hp vs mph.
« Reply #19 on: March 01, 2006, 08:48:13 AM »
I remember 25lbs per .1 also but I thought that was related to drag race cars...

For average drag racers, 20-25lbs = .10 & 1mph. More realistic.


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Offline Birdoprey

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Re: Theory, weight vs hp vs mph.
« Reply #20 on: March 01, 2006, 11:26:05 AM »
 I seem to recall Robert Suprenant and some others posting that 25lbs = .1 in the 1/4. Also 25lbs = 2mph and 2mph = .1

 Seems to be inline with what a few have posted already. I've never seen 1mph = .1. Two mph is more like it.
 Not really sure on the hp though. From what i've seen, 5hp would make a couple of mph. I've seen a few bikes put a pipe on and pickup 10hp and they usually pickup 4-5mph in the 1/4.
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 9.482 @ 144.89(1.523 60')Strapped, lowered, 16/40, BMC, Stk cans removed. Stk arm, and everything else
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Offline Quijinn

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Re: Theory, weight vs hp vs mph.
« Reply #21 on: March 01, 2006, 11:32:26 AM »
Remeber when they put on a pipe they pick up hp but they lose 25 or so lbs as well.

I ran 108 pre Pipe, and 113 with the BDE and supplyed map

so that is 5 mph, 1 from weight and 4 from hp ? at 2 hp per mph that means I would have picked up 8 hp

I think that sounds about right.
Hi my name is Mark and I am a Bikeaholic.     Be carefull how fast you race through life, the finish line is death, and the trophy is a headstone.  Our perspective is how we judge our lives, to judge others we need a little change in our perspective.

Offline Birdoprey

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Re: Theory, weight vs hp vs mph.
« Reply #22 on: March 01, 2006, 12:55:47 PM »
 Could be. I don't think you loose 25#'s going to a full system. I think you loose something like 15 or so which is still a good bit. Could be wrong though. I have a full stk system that i can weigh to see where its at. I believe the Brock/Hindle weighs 8-10#'s???
 I think that the formulas are close enough to use as a general rule of thumb.
-Mark
 9.995 @ 142(1.771 60')Totally stk. (04 Busa)
 9.482 @ 144.89(1.523 60')Strapped, lowered, 16/40, BMC, Stk cans removed. Stk arm, and everything else
 9.251 @ 152.69(1.547 60'). A&J dry shot. All else same as above

Offline Quijinn

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Re: Theory, weight vs hp vs mph.
« Reply #23 on: March 01, 2006, 03:48:23 PM »
I know the BDE system weighs like 8.5lbs. I belive someone said the stock is close to 32 lbs. plus pair is like a lb or so. I dont know for sure, just going off memeory.
Hi my name is Mark and I am a Bikeaholic.     Be carefull how fast you race through life, the finish line is death, and the trophy is a headstone.  Our perspective is how we judge our lives, to judge others we need a little change in our perspective.

Offline h82bbad

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Re: Theory, weight vs hp vs mph.
« Reply #24 on: March 01, 2006, 11:24:52 PM »
in the qtr Hotrod is 9 mph faster than I am, I outweigh him by 95 lbs. IMO 10lbs is 1 MPH (of course I am also a lot larger than him when it comes to trying to get out of the wind, so that could have some effect on it.
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