Does anybody remember this article there was a link to it posted on the board many months ago. I had it saved in a folder that I lost. Would like to look at it again. Thanks for any info.

 

This one? http://www.calgarydragracing.ab.ca/t...andtorque.html

 

HP=(Torque X RPM)/5252

Sorry, I saw that on TV today. Had to put it SOMEWHERE.

 

HP is only a theoretical number since all dynos record torque. Using the above formula HP is calculated from the results. Torque is how much work the engine can do. HP is how fast the work can be done.

When calculating HP from dragstrip results, it's best to use MPH. ET relies too much on traction and can't give an accurate enough reading. Finish line MPH will remain the same if you have a good or poor 60 foot time.

Dragstrip HP formula is:
HP=weight X (mph/234)cubed

Lets say your 3500 pound car is trying for a 100 MPH club. How much HP do you need?

HP=3500 X (100/234)cubed
HP=3500 X 0.078
HP=273 rear wheel HP required to push a 3500 pound car 100 mph in the 1/4 mile.

Want a faster car in the 1/4 mile with that engine? Make the car lighter.


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Follow my racing progress on Stephen's racing page
and check out the race car

87 IROC-Z Pro ET Bracket Race Car
383 stroker (carbed) with double hump cast iron heads and pump gas
461 Big Block installed and ready for the 2001 racing season

Best results before the 383 blew up
Best ET on a time slip: 11.857 altitude corrected to 11.163
Best MPH on a time slip: 117.87 altitude corrected to 126.10
Altitude corrected rear wheel HP based on power to weight ratio: 476.5
Best 60 foot: 1.662

Racing at 3500 feet elevation but most race days it's over 5000 feet density altitude!
Member of the Calgary Drag Racing Association

87 IROC bracket car, 91 454SS daily driver, 95 Homebuilt Harley