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Asphalt Racing Horsepower = E.T.

5K views 20 replies 9 participants last post by  onebad800 
#1 ·
I know there is no set formula and conditions very, However I was wonder what the pro's on here had for rough numbers as to 20 HP gain on an asphalt sled = 0.10 of a second gain????. (Example only)

Or a 200 HP sled should be maybe mid 9 second and 250 HP should be 8.80????

Anyone have any rough calculations???

Thanks in Advance
 
#2 ·
Only from what I have run or friends run:
Times from good traction tracks as well.
PS800 214hp - ran 9.1's at 625lbs w/1.28 60ft
PS1000 245hp - 8.7's at 650lbs w/1.24 60ft
PS1000 280hp - 8.2's at 650lbs w/1.14 60ft

200hp will get you in the mid 9's with decent 60fts and sled dialed in decent but so many scenarios hard to say based off hp.
 
#5 ·
I have two sleds, both weight 680 lbs. with rider, both have the old 15" wide 121" tracks, and both have cheap "home made" rear skids. One is a 800 twin @ 145 HP and runs in the 11.10 range and the other is a 809 tripple @ 171 HP that runs in the 10.80's.

Just by looking at my sleds and one bad 800s post, a 10 HP gain is Maybe/almost a 0.10 second gain???.
(Of course there is a other factors and I'm sure 10 Hp on a 280 HP motor running low 8's won't pick up a tenth)

I'm hard pressed to cut a 1.4 second 60', Also at my local track the finish line is almost 9 feet higher in elevation than the start line.
 
#8 ·
Those calculators work fairly well but you have to remember to use total weight (sled + rider) and some rendition of TRACK horsepower. The change in horsepower (you have to use the same reduction factor as track horsepower) will give you an idea of what your ET and MPH will change. For instance, a 20 HP change at the engine may only be 12 HP at the track.
 
#12 ·
Like already mentioned that formula is more for cars, My personal feeling is that the calculator gives a higher MPH number because cars have a different transmission.... At our local track the bikes always have faster MPH times than the sleds that run similar E.T.

It's still good to see links like that one.

Good work.
 
#21 ·
My 800 that ran 9.15 had 119 track hp motor made 214hp with tra's then switched to a reactor/cat setup made 123track hp never got it down the track,

my old 1006 I ran once at martin last year had motor water issues made 131 track hp and ran 8.76@144 pretty low hp for a 1006, most 1000 ps are in the 145-155 track hp or more. The calculators never jived with any of my known numbers? But I know 5 track hp is usually a tenth off your time as is 25-30lbs of weight?
 
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