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3k rpm at 80mph 6th gear?

Anybody know if this is right? When I'm driving on the freeway in 6th gear my RPMS are almost about 3K even when I'm not on the gas pedal. Feels

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Old 12-03-2009, 04:54 AM   #1 (permalink)
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Default 3k rpm at 80mph 6th gear?

Anybody know if this is right? When I'm driving on the freeway in 6th gear my RPMS are almost about 3K even when I'm not on the gas pedal. Feels like I'm in 5th gear really and also feels like its burning my gas like no other
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Old 12-03-2009, 06:59 AM   #2 (permalink)
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Compared to a 350Z or a G35, it's lower than those from what I've heard. There's nothing wrong with it. Hell my car gets GREAT gas mileage at about 73mph on extended trips.
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Old 12-03-2009, 07:57 AM   #3 (permalink)
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I avg. 30mpg on the highway at those speeds, nope, not burnin nuffin.
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Old 12-03-2009, 08:04 AM   #4 (permalink)
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That is right! That is the speed I am at 80% of the time with my baby! I was getting about 21.0, but have put about 6000 miles on her, and it is slowly creaping up... Currently at 23.8
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Old 12-03-2009, 08:27 AM   #5 (permalink)
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Here's how to calculate it:

mph = (rpm * cir) / (gear * final * 88)
mph = (3000*6.96)/(0.794*3.692*88)
mph = 80.9

where:
rpm = engine rpm (We'll use 3000)
cir = tire cicumference, in feet (We'll use 83.5" or 6.96' for 19's)
gear = gear ratio of your car (Assuming an MT in 6th, this is 0.794)
final = final drive ratio of your car (Assuming an MT, this is 3.692)
88 = combines several conversion factors


To work it backwards, using 73 MPH:

RPM = (mph * gear * final * 88) / circumference
RPM = (73*0.794*3.692*88)/6.96
RPM = 2706

This should get you close!

Last edited by WhiskeyHotel; 12-03-2009 at 08:30 AM.
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Old 12-03-2009, 01:02 PM   #6 (permalink)
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my G's 6MT rpm is considerably lower rpm than my Z.

my FitSport's 5MT cranks over 3.5K at 70mph. hahaha.
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Old 12-03-2009, 01:14 PM   #7 (permalink)
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Quote:
Originally Posted by kenchan View Post
my G's 6MT rpm is considerably lower rpm than my Z.

my FitSport's 5MT cranks over 3.5K at 70mph. hahaha.
The final drive on the G is 3.538. Assuming all else is equal, the RPM's should be about:

3.538/3.692 = 95.8% of the Z at the same speed.
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Old 12-03-2009, 01:21 PM   #8 (permalink)
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about 95.82% to be exact.
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Old 12-03-2009, 01:31 PM   #9 (permalink)
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Yep that's correct. In my 350 it was a little higher. Just remember the redline is 7.5k so there is plenty of gear left.
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