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????
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.
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.
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.
I have treid many calculators and used my own sled as well and agree cant get it close. Stone seems to have a formula he uses which appears to be close but he would have to post it not sure he will. Most calculators are car based so not sure if that makes a difference.
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.
This one saves a little time if you drag the cursor up & down the graph once numbers have been input. There's also an ET horsepower related page on this site.
I put in my weight with driver 600 lbs and mph 148 we ran and it came up with 151 HP. What HP would that now be track HP??? as it sure cant be engine HP.
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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