Help me with my RPM math...
Feb 23, 2006 | 10:16 AM
#1
Thread Starter
TECH Regular
Joined: Dec 2002
Posts: 486
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From: Pensacola, FL
Help me with my RPM math...
Someone confirm these numbers:
4.10 gears
32.0" tire diameter
4L65E with 1.00 3rd gear and 0.7 OD
At 75 MPH, I should see:
2300 RPM in OD and 3250 in 3rd, correct?
And, these numbers hold true regardless of the TC stall rating, assuming the TC is locked up, correct?
4.10 gears
32.0" tire diameter
4L65E with 1.00 3rd gear and 0.7 OD
At 75 MPH, I should see:
2300 RPM in OD and 3250 in 3rd, correct?
And, these numbers hold true regardless of the TC stall rating, assuming the TC is locked up, correct?
Feb 23, 2006 | 12:27 PM
#2
On The Tree
Joined: Sep 2005
Posts: 128
Likes: 0
From: Idaho
32.0" dia = 100.53" travelled per revolution of tire
75 MPH = 396,000 feet/hr = 4,752,000 inches/hr = 79,200 inches/minute
79,200/100.53 = 787.82 RPM at tire
787.82*4.10 = 3,230 RPM at driveshaft
3rd gear at 1:1 = 3,230 RPM
4th gear = 0.70*3,230 = 2,261 RPM
Hope this helps
Mike
75 MPH = 396,000 feet/hr = 4,752,000 inches/hr = 79,200 inches/minute
79,200/100.53 = 787.82 RPM at tire
787.82*4.10 = 3,230 RPM at driveshaft
3rd gear at 1:1 = 3,230 RPM
4th gear = 0.70*3,230 = 2,261 RPM
Hope this helps
Mike
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