Sign up to remove ads. We'd love to have you amongst our ranks! Just click the Register button below!

lincoln forums   lincoln forum
Direct Links: MKZ | MKS | New Continental (Old) | MKT | MKX | MKC | Navigator | Nautilus | Town Car | LS
Lincoln Forum: Question regarding MPH vs RPM
Results 1 to 14 of 14
  1. #1
    Join Date
    Jan 2016
    Posts
    2

    Question regarding MPH vs RPM

    Remove this ad
    Hoping someone here can give me an answer to this. I own a 2004 Ultimate Town Car, stock. (Been driving Town Cars since '89). Does anyone know approx. what rpm it's turning at 80mph? Just took an almost 900 mile trip this past weekend and was running a constant 80-85 and started to wonder what the rpm's were. Gas mileage was just over 22. I just rolled 100,000 miles on this trip.

    My first Town Car was an '89 that I bought new in '89. That car lasted 586,000 miles on the original engine and trans. Ford sent me a pen.
    Last edited by Vanns40; 01-31-2016 at 02:40 PM. Reason: Spelling

  2. #2
    mark95man's Avatar
    mark95man is offline Senior Member My Lincoln(s): 2014 Navigator & MKZ Hybrid, 07 TC Designer, 96 TC, 79 MARK V Cartier, 75+ 69-71 Lincoln MARK IIIs
    Join Date
    Aug 2013
    Location
    NY/NJ to Maricopa, AZ
    Posts
    673
    Quote Originally Posted by Vanns40 View Post
    Hoping someone here can give me an answer to this. I own a 2004 Ultimate Town Car, stock. (Been driving Town Cars since '89). Does anyone know approx. what rpm it's turning at 80mph? Just took an almost 900 mile trip this past weekend and was running a constant 80-85 and started to wonder what the rpm's were. Gas mileage was just over 22. I just rolled 100,000 miles on this trip.

    My first Town Car was an '89 that I bought new in '89. That car lasted 586,000 miles on the original engine and trans. Ford sent me a pen.
    Since no one has responded, I'll attempt as my last two purchased new Town Cars had tachometers. My 1996 Signature with Touring Package would average around 1,600 RPM going 75 MPH--all depends on rear end gearing, overdrive gearing and hills. My 2007 Designer average around 1,800 RPM going 80 MPH on a flat highway. It was rare, when cruising, to go above 2,000 RPMs unless I was traveling on hilly roads. Our 95 & 08 MGM, with tachometers gave about the same RPMs. All are sold now, so all I have is my memory. My purchased new 2014 Navigator usually has the same RPMs in that MPH range as all were V-8s. Any vehicle with V-6 or I-4 engines would have higher RPMs. One of the reasons why my V-8 Navigator is giving me higher MPG than the new V-6 EcoBoost powered Navigators.

  3. #3
    04TC is offline Junior Member My Lincoln(s): 2004 Town Car Signature
    Join Date
    May 2016
    Posts
    8
    This is about a year late, but I have a 2004 Signature and installed a tach on it which reads about 1900 rpm when I am doing 80 on the freeway. The roads here in Florida are flat, so if going uphill the rpms could be higher if it downshifts. But I've pretty much only driven mine on flat roads since I bought it in May.

  4. #4
    Town's Avatar
    Town is online now Senior Member My Lincoln(s): 2017 Lincoln Continental Reserve 2.7 AWD; 2007 Lincoln Town Car Signature Limited (sold)
    Join Date
    Jan 2013
    Location
    Ottawa Ontario Canada
    Age
    73
    Posts
    3,235
    The engine rpm's quoted here are much lower than I would have expected. My 2007 Town Car with stock tachometer turns 1,750 rpm on the flat at 100 kph which is 62.1 mph. So it is 35.48 miles per 1,000 rpm as a common measurement for comparing gearing variations. So at 80 mph my engine would be turning at least 2,254 rpm. Since 80 mph (130 kph) is way above the speed limit, I only use that speed when overtaking, and I don't remember what the rpm indicated (at 80 mph).

    Different models may have different axle ratios and rim/tire sizes so one would need to start there for an accurate comparison. The other factors such as speed and wind loading on the car would tend to require more engine loading that may increase engine rpm at 80 mph due to torque converter and general hydraulic transmission inefficiencies.

    Good luck.

  5. #5
    Join Date
    Oct 2012
    Location
    Fort Worth, TX
    Posts
    219
    Speed limits in Canada are kinda low. This is MPH in Texas.
    Attached Images Attached Images

  6. #6
    Town's Avatar
    Town is online now Senior Member My Lincoln(s): 2017 Lincoln Continental Reserve 2.7 AWD; 2007 Lincoln Town Car Signature Limited (sold)
    Join Date
    Jan 2013
    Location
    Ottawa Ontario Canada
    Age
    73
    Posts
    3,235
    Quote Originally Posted by Rusty Boltz View Post
    Speed limits in Canada are kinda low. This is MPH in Texas.
    Perhaps. In the province of Ontario many highway speed limits are 100 kph (62.1 mph), but when province of BC increased speed limits to 120 kph (75 mph) in 2014 there was an 11% increase in serious accidents so they returned to lower speed limits. Our roads may be more challenging or perhaps we don't drive as well or we get substantial weather changes between seasons and the limits remain low to mitigate safety issues.

    So what does your tach read at 85 mph?

  7. #7
    Join Date
    Oct 2012
    Location
    Fort Worth, TX
    Posts
    219
    Quote Originally Posted by Town View Post
    Perhaps. In the province of Ontario many highway speed limits are 100 kph (62.1 mph), but when province of BC increased speed limits to 120 kph (75 mph) in 2014 there was an 11% increase in serious accidents so they returned to lower speed limits. Our roads may be more challenging or perhaps we don't drive as well or we get substantial weather changes between seasons and the limits remain low to mitigate safety issues.

    So what does your tach read at 85 mph?
    Interesting you asked. I had a chance to get out on the 85 mph highway on Thursday. About 2450 rpm at 85 mph; 2000 rpm at 75 mph. My MKS is the 3.7L front wheel drive. I don't know what the differential ratio is.

  8. #8
    Town's Avatar
    Town is online now Senior Member My Lincoln(s): 2017 Lincoln Continental Reserve 2.7 AWD; 2007 Lincoln Town Car Signature Limited (sold)
    Join Date
    Jan 2013
    Location
    Ottawa Ontario Canada
    Age
    73
    Posts
    3,235
    Quote Originally Posted by Rusty Boltz View Post
    Interesting you asked. I had a chance to get out on the 85 mph highway on Thursday. About 2450 rpm at 85 mph; 2000 rpm at 75 mph. My MKS is the 3.7L front wheel drive. I don't know what the differential ratio is.
    Thanks for the update. Numerically a higher number than my 3.27 ratio, assuming your wheel/tire diameter is about 29" like mine. Strange that your rpm per 1,000 rpm is so different at 85 (34.6) compared to 75 (37.5).

    I wonder what your rpms are at 62 mph, if you can travel that slowly on your highway. My car is now sold so I cannot retest at different speeds.

  9. #9
    Join Date
    Oct 2012
    Location
    Fort Worth, TX
    Posts
    219
    Quote Originally Posted by Town View Post
    Thanks for the update. Numerically a higher number than my 3.27 ratio, assuming your wheel/tire diameter is about 29" like mine. Strange that your rpm per 1,000 rpm is so different at 85 (34.6) compared to 75 (37.5).

    I wonder what your rpms are at 62 mph, if you can travel that slowly on your highway. My car is now sold so I cannot retest at different speeds.
    It must have been 70 mph at 2000 rpm (I couldn't remember for sure). Also, the tach display in my MKS is kind of small, so it's difficult to determine an exact number of rpm. I don't know the wheel/tire diameter, but I have 19" wheels. I'll try to remember to check the rpm at 62 mph the next time I'm on the highway.

  10. #10
    Town's Avatar
    Town is online now Senior Member My Lincoln(s): 2017 Lincoln Continental Reserve 2.7 AWD; 2007 Lincoln Town Car Signature Limited (sold)
    Join Date
    Jan 2013
    Location
    Ottawa Ontario Canada
    Age
    73
    Posts
    3,235
    Quote Originally Posted by Rusty Boltz View Post
    It must have been 70 mph at 2000 rpm (I couldn't remember for sure). Also, the tach display in my MKS is kind of small, so it's difficult to determine an exact number of rpm. I don't know the wheel/tire diameter, but I have 19" wheels. I'll try to remember to check the rpm at 62 mph the next time I'm on the highway.
    Great that would be intersting. The new Continental has final drive gearing of 2.77 with the 2.7 liter AWD version (3.39 with the 3.0 liter performance version) and 245/45R19 tires or 245/40R20 tires that both have a diameter of 27.7". That spec may be similar to yours. My 225/60R17 stock tires are actually 27.6" in diameter, now that I checked them, my 235/60R17 replacements are 28.1".

  11. #11
    Join Date
    Oct 2012
    Location
    Fort Worth, TX
    Posts
    219
    About 1850 rpm at 62 mph (again - small tach display).

  12. #12
    Town's Avatar
    Town is online now Senior Member My Lincoln(s): 2017 Lincoln Continental Reserve 2.7 AWD; 2007 Lincoln Town Car Signature Limited (sold)
    Join Date
    Jan 2013
    Location
    Ottawa Ontario Canada
    Age
    73
    Posts
    3,235
    Quote Originally Posted by Rusty Boltz View Post
    About 1850 rpm at 62 mph (again - small tach display).
    Great, so very close to mine.

  13. #13
    Join Date
    Jan 2016
    Posts
    2
    Thanks for all the info. Gearing is everything and I forgot to add that I believe mine is 2.73. With that it should be a pretty low rpm at higher speeds. Just checked the gas mileage the other day and at 60mph I'm still getting a solid 26.3mpg on flat highway. With 103,000 now on the car I consider that outstanding. Also have been remembering to change the differential 75/140 every 20-25,000 miles. I use Royal Purple synthetic. That has made all the difference in the world at keeping wear on the gears down to just about zero. You can still see the hash marks on the gears!

  14. #14
    Town's Avatar
    Town is online now Senior Member My Lincoln(s): 2017 Lincoln Continental Reserve 2.7 AWD; 2007 Lincoln Town Car Signature Limited (sold)
    Join Date
    Jan 2013
    Location
    Ottawa Ontario Canada
    Age
    73
    Posts
    3,235
    Remove this ad
    Car and Driver tested the 2017 Continental 3.0 liter with 255/45R19 tires and 3.39 axle ratio and said it did 32.4 mph per 1,000 rpm. That would be 1,913 rpm at 62 mph and 2,469 rpm at 80 mph. My Continental 2.7 has the same tires and either 3.16 axle ratio (likely) or the 2.77 axle ratio spec'd by Lincoln (who also spec 3.39 for the 3 liter). The tach is small and divisions are at 500 rpm instead of 250 rpm on my old Town Car with a large tach. My tach at 62 mph shows 1,800 to 1,900 rpm (noticeable gap to 2,000 rpm).

Bookmarks

Posting Permissions

  • You may not post new threads
  • You may not post replies
  • You may not post attachments
  • You may not edit your posts
  •