 How Do Gear Ratios Work? |
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 Mar 13 2004, 04:49 PM
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#21
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 Talkin' the talk since 2003  Group: Admin Posts: 28,271 Joined: 27-August 03 From: Seattle, WA Member No.: 27 Car: 2004 VW GTI 1.8T  |
Yeah, we did, and I had a screenshot and I won but he still doesn't get it
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Mar 13 2004, 08:14 PM
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#22
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 Pit Mechanic Group: Members Posts: 1,304 Joined: 21-November 03 Member No.: 192 |
RSX type S
Gear Ratio Final Drive Engine:Wheel RPM 1st 3.267 x 4.389 14.339 2nd 2.130 x 4.389 9.349 3rd 1.517 x 4.389 6.658 4th 1.147 x 4.389 5.034 5th 0.921 x 4.389 4.042 6th 0.738 x 4.389 3.609 Given P205/55 R16 89V All-Season radials Have a circumference of: [{(205mm wide * (55% aspect ratio*2) + 16" <406.4mm>} x Pi ] = 1985mm = 1.985 m Then 4000 rpm in 3rd gear would give you a speed of: [4000 engine rev/min] * [1 min/ 60 sec] * [1/6.658 wheel rev/ engine rev] * [1.985 m / wheel rev] = 19.876 m/s Which in mph is: [19.876 m/s] * [3600 sec/ hr] * [0.000621 mi/ m] = 44.4 mph. Is that agree with reality? |
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Mar 13 2004, 08:26 PM
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#23
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Talkin' the talk since 2003 Group: Admin Posts: 28,271 Joined: 27-August 03 From: Seattle, WA Member No.: 27 Car: 2004 VW GTI 1.8T |
You messed up the tire diameter, it's 225.5 mm, not 205 (because it's a 55 aspect ratio)
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Mar 13 2004, 08:39 PM
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#24
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 manual > Group: Members Posts: 6,300 Joined: 26-August 03 From: WA Member No.: 9 |
QUOTE(Frederf @ Mar 13 2004, 08:13 PM) 951.6 mph. Lol, checking the math again. well damn! im getting a RSX now!
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Mar 13 2004, 08:43 PM
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#25
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Pit Mechanic Group: Members Posts: 1,304 Joined: 21-November 03 Member No.: 192 |
That's 951.6 miles per 60 hours. I forgot that's 4000 revs / minute. Not 4000 revs / second.
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Mar 13 2004, 08:45 PM
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#26
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manual > Group: Members Posts: 6,300 Joined: 26-August 03 From: WA Member No.: 9 |
951.6/60 = 15.86mph?? if thats the right conversion then its waaaaaaaaaaaaaaaaaay too slow for 3rd
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Mar 14 2004, 01:58 AM
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#27
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Talkin' the talk since 2003 Group: Admin Posts: 28,271 Joined: 27-August 03 From: Seattle, WA Member No.: 27 Car: 2004 VW GTI 1.8T |
no, the math ends up coming out to 44.4 MPH at 4000 RPM in 3rd gear, which is correct.
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