home *** CD-ROM | disk | FTP | other *** search
- Newsgroups: alt.autos.rod-n-custom
- Path: sparky!uunet!spool.mu.edu!agate!usenet.ins.cwru.edu!eagle!lims02.lerc.nasa.gov!xxkozak
- From: xxkozak@lims02.lerc.nasa.gov (GEORGE KOZAK)
- Subject: Re: Horsepower calculations?
- Message-ID: <21DEC199214580970@lims02.lerc.nasa.gov>
- News-Software: VAX/VMS VNEWS 1.41
- Keywords: horsepower
- Sender: news@eagle.lerc.nasa.gov
- Nntp-Posting-Host: lims02.lerc.nasa.gov
- Organization: NASA Lewis Research Center
- References: <92343.162029DAB134@psuvm.psu.edu> <1992Dec9.162710.3364@hellgate.utah.edu> <1992Dec10.112853.11373@hellgate.utah.edu> <7694@pharaoh.cyborg.bt.co.uk>
- Date: 21 Dec 1992 14:58 EST
- Lines: 24
-
- In article <7694@pharaoh.cyborg.bt.co.uk>, ian@pharaoh.cyborg.bt.co.uk (Speed Freak) writes...
- >xxkozak@lims02.lerc.nasa.gov (GEORGE KOZAK) writes:
- >> 3
- >> HP = 200 (WT/ET ) (WT divided by ET cubed)
- >
- >> Where WT = total weight of car, driver, etc. in pounds.
- >> ET = 1/4 mile Elapsed Time in seconds.
- >
- >I tried this equation out with some road test figures, and with 1/4 mile
- >times obtained by me and my friends. The results were usually very accurate.
- >The only car it failed for was the Sierra Cosworth. This car has 204bhp,
- >weighs about 3000lbs with 2 passengers and can do a 1/4 in 14.5. Perhaps
- >it is faster than expected because of the torque from the turbo ?
- >
- >Ian.
- >--
- >Ian Crocker ian@cyborg.bt.co.uk
- Yes, the equation doesn't work too well with the turbocharged motors.
- The turbo skews the HP curve the same ways that a supercharger or Nitrous
- oxide would. Those devices don't help much at the starting line, but add
- significantly to the MPH at the finish line. The ET ends up looking too
- slow for the speed.
- George
-
-