what are your RPMs at 80mph?
03-26-2005, 03:15 PM
#1
Senior Member
Thread Starter
Join Date: Jan 2005
Location: College Park, MD
Posts: 229
what are your RPMs at 80mph?
I was drivin today...goin about 80 to stay with traffic and I was noticing my RPMs. At 80mph on a flat surface, my car stays between 3.1-3.3 RPM. Is this normal? This is my first manual and V6...maybe that has something to do with it
03-26-2005, 03:23 PM
#2
Senior Member
Join Date: May 2004
Posts: 6,190
Sounds about right. I believe at 75 I am at about 3100 rpm, but my car is a 5-speed.
03-26-2005, 04:11 PM
#4
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Join Date: Feb 2005
Posts: 69
Originally Posted by njmaxseltd
My auto is around 2800 RPM's at 80, 2500 RPM's is 72MPH. I wonder why the 5 speed is geared so differently up top then autos.
03-26-2005, 04:18 PM
#6
1 of few unmodded 4G Maxs
Join Date: Mar 2002
Location: Commerce Twp., MI
Posts: 2,828
having an auto, ~2800RPM
03-26-2005, 05:11 PM
#9
FOR SE with 215/60R15 tires
1st= 3.285
2nd= 1.850
3rd= 1.272
4th= 0.954
5th= 0.795
Reverse= 3.429
Final Drive Ratio= 3.823
RPM=6,550
MPH=(engine RPM X Tire Radius) / (Final Gear Ratio X 168)
Tire Radius (inches): aspect ratio(215 X .60=129)X .0394 (mm to inch conv.) = 5.08in
5.08 + 15(rim size) X .5
5.08 + 7.5=12.58
Final Gear Ratio: gear ratio (.795=5th gear) X final drive (3.823)=
3.04
MPH = (6,550 x 12.58) / (3.04 X 168)
MPH = 82399 / 510.72
max MPH in 5th gear = 161.34mph
MPH/RPM = 161.34 X 1000 / RPM
MPH/RPM = 161340 / 6550
MPH/RPM = 24.63
24.63 X 3000rpm = 73.9mph
XXXX X 3100rpm = 76.4mph
XXXX X 3200rpm = 78.8mph
XXXX x 3,250rpm = 80.0mph
XXXX X 3300rpm = 81.3mph
1st= 3.285
2nd= 1.850
3rd= 1.272
4th= 0.954
5th= 0.795
Reverse= 3.429
Final Drive Ratio= 3.823
RPM=6,550
MPH=(engine RPM X Tire Radius) / (Final Gear Ratio X 168)
Tire Radius (inches): aspect ratio(215 X .60=129)X .0394 (mm to inch conv.) = 5.08in
5.08 + 15(rim size) X .5
5.08 + 7.5=12.58
Final Gear Ratio: gear ratio (.795=5th gear) X final drive (3.823)=
3.04
MPH = (6,550 x 12.58) / (3.04 X 168)
MPH = 82399 / 510.72
max MPH in 5th gear = 161.34mph
MPH/RPM = 161.34 X 1000 / RPM
MPH/RPM = 161340 / 6550
MPH/RPM = 24.63
24.63 X 3000rpm = 73.9mph
XXXX X 3100rpm = 76.4mph
XXXX X 3200rpm = 78.8mph
XXXX x 3,250rpm = 80.0mph
XXXX X 3300rpm = 81.3mph
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