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What gear do you think this is, i know theres a way to calculate it What gear do you think this is, i know theres a way to calculate it
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Old 02-13-2011, 11:04 PM
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What gear do you think this is, i know theres a way to calculate it
2005 4.8is. Could it be top of 4th? More likely 5th, right?
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Old 02-14-2011, 12:32 AM
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If that were an 00-03 I'd say definitely fourth. I'm not familiar with the 6 speed trans but I still think its probably fourth (just guessing). You could always find out for sure in manual mode :-)
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Old 02-14-2011, 01:07 AM
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Let's assume your gear ratios are these:
Gear Type 6 Speed Automatic Final Drive 3.91:1 1st Gear Ratio 4.17:1 2nd Gear Ratio 2.34:1 3rd Gear Ratio 1.52:1 4th Gear Ratio 1.14:1 5th Gear Ratio 0.87:1 6th Gear Ratio 0.69:1
Then:
120 miles/hr x 5280 ft/mile x 12 in/ft x 1 hr/60 min = 126,720 in/min.
Assume tire diameter is 29 in.
Circumference is 29 x pi = 91.1 in.
Tire rotation speed is 126,720/91.1 = 1391
Rotational speed of drive shaft = 1391 x 3.91 = 5439
Gear ratio = 6200 rpm/5439 = 1.14
You are in 4th gear.
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Old 02-14-2011, 01:38 AM
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Looks like 4th to me without even doing the calcs.
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Old 02-14-2011, 01:53 AM
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Quote:
Originally Posted by sedate_driver View Post
Let's assume your gear ratios are these:
Gear Type 6 Speed Automatic Final Drive 3.91:1 1st Gear Ratio 4.17:1 2nd Gear Ratio 2.34:1 3rd Gear Ratio 1.52:1 4th Gear Ratio 1.14:1 5th Gear Ratio 0.87:1 6th Gear Ratio 0.69:1
Then:
120 miles/hr x 5280 ft/mile x 12 in/ft x 1 hr/60 min = 126,720 in/min.
Assume tire diameter is 29 in.
Circumference is 29 x pi = 91.1 in.
Tire rotation speed is 126,720/91.1 = 1391
Rotational speed of drive shaft = 1391 x 3.91 = 5439
Gear ratio = 6200 rpm/5439 = 1.14
You are in 4th gear.
Wow nice calculations!

Thanks for the info everyone!
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Old 02-14-2011, 10:24 AM
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You may consider removing that photo, see this link!

Man jailed after filming himself driving 140 mph - Yahoo! News
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Old 02-14-2011, 10:28 AM
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Quote:
Originally Posted by msammy View Post
You may consider removing that photo, see this link!

Man jailed after filming himself driving 140 mph - Yahoo! News
It wasn't me! My friend.. He posted on fb...I guess he's not worried!
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Old 02-14-2011, 10:49 AM
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Originally Posted by msammy View Post
You may consider removing that photo, see this link!

Man jailed after filming himself driving 140 mph - Yahoo! News
The video footage is incidental, the guy was clocked by the Police doing 118mph, he's in schtick for that anyway.

I'm more than happy to make the following statement, and can guarantee 100% that I will not be arrested: I did over 140mph on my way to work this morning.

A post on the internet is not in itself evidence
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Old 02-14-2011, 10:49 AM
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Quote:
Originally Posted by sedate_driver View Post
Let's assume your gear ratios are these:
Gear Type 6 Speed Automatic Final Drive 3.91:1 1st Gear Ratio 4.17:1 2nd Gear Ratio 2.34:1 3rd Gear Ratio 1.52:1 4th Gear Ratio 1.14:1 5th Gear Ratio 0.87:1 6th Gear Ratio 0.69:1
Then:
120 miles/hr x 5280 ft/mile x 12 in/ft x 1 hr/60 min = 126,720 in/min.
Assume tire diameter is 29 in.
Circumference is 29 x pi = 91.1 in.
Tire rotation speed is 126,720/91.1 = 1391
Rotational speed of drive shaft = 1391 x 3.91 = 5439
Gear ratio = 6200 rpm/5439 = 1.14
You are in 4th gear.
I love seeing math like this. Nice work. I was just guessing 4th. But you made it clear.
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Old 02-14-2011, 11:05 AM
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Quote:
Originally Posted by Naz24 View Post
It wasn't me! My friend.. He posted on fb...I guess he's not worried!
LOL! I hear ya! Just be careful driving that fast while taking photos!
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