figuring your horsepower?
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Member
Joined: Jul 2001
Posts: 187
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From: Keyport, WA
Car: 98 Z28
Engine: 346 LS1
Transmission: 6 spd.
Axle/Gears: Ford 9" 4.11
figuring your horsepower?
I know there is an equation somewhere to find out how much horsepower you have from your 1/4 mile time. The only problem is, I can't find it. I checked the equations page, no luck. I thought I'd post and see if one of you guys could help me out. Thanx
Supreme Member
Joined: Sep 2001
Posts: 6,111
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From: Ontario, Canada
Car: 1988 Firebird S/E
Engine: 406Ci Vortec SBC
Transmission: TH-350/3500stall
Axle/Gears: 7.5" Auburn 4.10 Posi-Traction
MPH = 234.74 x (cubic root of power/weight)
HP = (MPHx.00426)x(MPH x.00426)x(MPH x.00426)
This is for rear wheel HP or net hp when the weight and MPH@ the end of 1/4 mile is known.
There is no real reliable formula for finding the hp from the 1/4 mi. ET because
traction can vary, a bad launch or improper shift point will throw off the ET. But MPH will be effected very little.
Flywheel HP is generaly 15 to 20% greater than rearwheel HP. but can vary.
At least it makes for some interesting bench racing....
HP = (MPHx.00426)x(MPH x.00426)x(MPH x.00426)
This is for rear wheel HP or net hp when the weight and MPH@ the end of 1/4 mile is known.
There is no real reliable formula for finding the hp from the 1/4 mi. ET because
traction can vary, a bad launch or improper shift point will throw off the ET. But MPH will be effected very little.
Flywheel HP is generaly 15 to 20% greater than rearwheel HP. but can vary.
At least it makes for some interesting bench racing....
Supreme Member
Joined: Aug 1999
Posts: 1,443
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From: College Station, Tex USA
Car: 89rs
Engine: 400Sb
Transmission: Tremec 3550
If your mathmatically challanged, you can use the web
http://home.tampabay.rr.com/yz250/calc.htm
http://home.tampabay.rr.com/yz250/calc.htm
Junior Member
Joined: Oct 2001
Posts: 69
Likes: 1
From: Henderson,KY,USA
Try this one http://www.smokemup.com/utilities/calc.cfm
Supreme Member
Joined: Sep 2001
Posts: 6,111
Likes: 53
From: Ontario, Canada
Car: 1988 Firebird S/E
Engine: 406Ci Vortec SBC
Transmission: TH-350/3500stall
Axle/Gears: 7.5" Auburn 4.10 Posi-Traction
<font face="Verdana, Arial" size="2">Originally posted by Apeiron:
You forgot the weight term:
HP = (0.00426 x mph)<SUP>3</SUP> x weight</font>
You forgot the weight term:
HP = (0.00426 x mph)<SUP>3</SUP> x weight</font>
Thread Starter
Member
Joined: Jul 2001
Posts: 187
Likes: 0
From: Keyport, WA
Car: 98 Z28
Engine: 346 LS1
Transmission: 6 spd.
Axle/Gears: Ford 9" 4.11
Thanx for the help, I knew there was a formula but didn't remember what it was. I'm heading to the track on wednesday. If I can get my tires to bite hopefully I'll have a fairly accurate HP reading. Thanx again.
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Thread Starter
Member
Joined: Jul 2001
Posts: 187
Likes: 0
From: Keyport, WA
Car: 98 Z28
Engine: 346 LS1
Transmission: 6 spd.
Axle/Gears: Ford 9" 4.11
Thanx for the help, I knew there was a formula but didn't remember what it was. I'm heading to the track on wednesday. If I can get my tires to bite hopefully I'll have a fairly accurate HP reading. Thanx again.
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