RPMs @70mph?
Got Diesel?
Joined: Jan 2004
Posts: 4,345
Likes: 22
Originally Posted by moebdick
Mine (3.73 5sp TS) runs ±2000RPM @ 70mph on the speedo also, but I have noticed once or twice that when I pass those radar speed trailers that display your speed, the sign reads 2 or 3 mph slower than my speedo does.
As well, at 70mph, my RPM's are +/- 2000 RPM's and that is with 3.73 gears.
Good luck,
Jeff
Elder User
Joined: Sep 2004
Posts: 821
Likes: 1
From: Nashville
Originally Posted by Beachbumcook
The dealer modifed the programming for a "fake tire size" and it corrected the speedo for me so 70mph is actually 70mph (not 67mph).
Got Diesel?
Joined: Jan 2004
Posts: 4,345
Likes: 22
Originally Posted by moebdick
That's interesting. Did he say what tire size he programmed it for?
After he did it... all was well. I think he decreased the tire size in the computer so it senses that the tires are spinning faster to go the same distance and this adds the 3mph that I needed to get my spedo to read correctly (no body quote me since this has been 2-1/2 years ago)?????
I now have 52,000 miles on my 2003 Excursion LTD 4X4. Have only had programing and lower radiator hose repaired. Oil changes every 5,000 miles with Motorcraft 15W-40, fuel filters every 15,000 and transmission every 30,000 miles. I puke no coolant except for a drop here and there and I get 17 - 18mpg on the highway and 15.5 - 16.2 in the city. My overhead is within .5 of actual hand calculations. The only aftermarket product I run is a dieselsite coolant filter (yes, i flushed the cooling system with distilled water when installed at 51,000 miles).
I do miss the tow-haul and pilot injection as it was when I bought it, but otherwise the truck does what I need it do do.
The purpose of the thread was RPM's.... and I am around 2,000 (1,800 - 2,500) at 70mph with 3.73 gears.
Thanks,
Jeff
Thread
Thread Starter
Forum
Replies
Last Post
trevorrules
1987 - 1996 F150 & Larger F-Series Trucks
11
Jul 24, 2013 02:12 PM
