8th Generation Honda Civic Forum - View Single Post - Everything You Wanted To Know About Car Measurements(HP, TQ, Gear Ratios etc.)
View Single Post
Old 02-01-2008, 10:04 PM   #38 (permalink)
BigT
Senior Member
 
BigT's Avatar
 
Join Date: Jun 2007
Location: Duff Beer Krusty Burger Buzz Cola Costington's Department Store Kwik-E-Mart Stupid Flanders Park
Posts: 2,935
Quote:
Originally Posted by KingMarineM16a4 View Post
Only the Si and it still basically has 200hp. Gears multiply tq (and hp in a way). Say you had 200 tq and first gear was 3:1 (remember using basic numbers) than in first gear you would have 600tq, and since TQxRPM= HP, your HP would also multiply... Now to dyno sheets.
HP would actually stay the same. You are multiplying the torque by 3x, but you are dividing the RPM by 3. Horsepower would stay the same.

200 torque x 6,000 RPM = approx. 228 HP

Now first gear ratio of 3:1

600 torque x 2,000 RPM = approx. 228 HP. It is the exact same horsepower.

If you wanted to get technical you could point out that since there is a slight torque loss from friction the torque would be slightly less than 600 and there would be a slight HP loss.
BigT is offline   Reply With Quote