What RPMs are you reading at 65MPH? - Diesel Forum - TheDieselStop.com
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Power Strokes 1994-1997 General Technical discussion of topics related to vehicles powered by the Power Stroke engine in 1994 through 1997 models.

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Old 04-04-2011, 04:22 PM   #1 (permalink)
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What RPMs are you reading at 65MPH?

My truck is a 1996 F350 4x4 CC/LB 7.3L, 5-Speed.

Now, I realize that this truck is no speed demon, but like I have said before, I live in Northern California and around here, everyone drives like an idiot and goes as fast as they can.

I usually just set my own pace and not care about anyone else and how fast they think they need to go.

But my question is, when you are driving on the freeway, going about 65 MPH, what does your tach read?

Mine reads just at 2000. And for every mile an hour faster, you get exactly 100 rpm more-meaning that at 70, I am reading 2500.

Does this sound okay, or do you guys think that the motor is turning a little too fast for the kind of driving that I do?

Just by what I have told, can you give me a guess on what gears are in the truck?

What RPM SHOULD I try to stay at when I am driving on the freeway so as not to damage the motor?

Any other suggestions?
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120,000 miles on the clock!

SOLD at 320,000 miles, never had a problem in the 10 months I owned it...
1996 Ford F350, XLT, 7.3L PSD, 4x4, 5-Speed, Crew Cab, Long Bed, 285 BFG All-Terrains, Diamond Eye 3" DP.

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Mileage Update 8/28/11-316,xxx miles, all is good.
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Old 04-04-2011, 06:22 PM   #2 (permalink)
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1994 F-350 Dually 7.3 diesel. I too have the 5 speed manual. I don't like driving much over 60 as I am told that is when I start cutting back on my fuel mileage. My son has had it up to near 80 a couple of times but he isn't driving my truck anymore.

My new battery cables should be in tomorrow, hope the starter makes it's way here this week too. As soon as I can get the "Beast" running again, I'll chime in here on what I prefer for rpm's too.

cheers!
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Old 04-04-2011, 08:48 PM   #3 (permalink)
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i don't believe you will hurt the engine , the faster you go the more you hurt you're mileage . at 65mph my engine is turning about 2200 to 2300 rpm , i have 410 gears and an auto trans . you're info should be on the driver's door post. unless it has been removed or painted over . it sounds like you have the same gears , lower rpm's because of the 5 speed i suspect .
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Old 04-05-2011, 12:11 AM   #4 (permalink)
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I have a 96 also but with the auto, my rpm's are at 2000 at 65 mph and I have 4.10's. as far as doing damage don't worry about that I have towed thousands of miles with my rpm's between 2200-3000. You will get much better gas mileage if you can stay at 2000 or below
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Old 04-05-2011, 01:36 AM   #5 (permalink)
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Thanks for the responses guys.

It's at 2100-2300 going 65.

But I've gotta throw this out there-GAS MILEAGE on a diesel truck???

Sorry, I'm a product of my surroundings!!!
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NOW-1999 F250 XLT, 7.3 PSD, 4x4 6-Speed, SCab, Shortbed, 3" Leveling Kit, 35" BFG AT's, DP, Air Raid, Custom Straight Pipe w/MBRP tip, Line-X, Reunel Rear Bumper, Powercoated Front Bumper, and more!!!

120,000 miles on the clock!

SOLD at 320,000 miles, never had a problem in the 10 months I owned it...
1996 Ford F350, XLT, 7.3L PSD, 4x4, 5-Speed, Crew Cab, Long Bed, 285 BFG All-Terrains, Diamond Eye 3" DP.

All Stock Otherwise- 312,000 miles.
Mileage Update 8/28/11-316,xxx miles, all is good.
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Old 04-05-2011, 05:44 AM   #6 (permalink)
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Both gas and diesel engines burn FUEL, that's why I started using fuel as a base.
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Old 04-05-2011, 06:34 PM   #7 (permalink)
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I have the E4OD tranny and I run at 1900 RPM at 65 mph. Without the OD, I hit 1900 RPM at 43 mph so it makes a big difference. Using cruise on the highway at 65 I average around 22 mpg on regular diesel fuel, 20 mpg on biodiesel.
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Old 04-05-2011, 08:24 PM   #8 (permalink)
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Quote:
But my question is, when you are driving on the freeway, going about 65 MPH, what does your tach read?
Will depend on rear end gear ratio. Like you can see from previous posts a 4:10 rear will put you at about 65mph (or perhaps a hair less) at 2000rpm.
Frugalyankee has a 3:80 or 3:55 rear if I would have to guess since he is 1900 rpm at 65.
At 1900-2000rpm my automatic e40d goes 68.5 and I have a 3:55 rear gear.

For me the tach reads 70mph while doing this though. I have determined through both gps and mile markers that I have about a 3% or 1.5mph odometer error at 65-70mph.
Tire size will also skew your results a little, but point being that your speed at 2000 rpm is a pretty good indication of what rear gear ratio you have.

Way to go on your mileage frugalyankee. Ive hit close to that a few times but I am usually sub 20mpg. The difference between 70mph and 65mph is very tangible in mileage but also takes an equivalent amount of discipline to stay that slow vs going 68 to 70.
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Last edited by angst; 04-05-2011 at 08:43 PM.
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Old 04-06-2011, 07:52 AM   #9 (permalink)
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With my factory tires, 235-85R-16's & my 265-75R-16's (same rev's/mile according to Firestone/Bridgestone website) in O/D 5th gear in my ZF w/3.55 gears I run 67 mph @ 2000 rpm. I've figured it out mathmatically, counting mile posts, with GPS, everything EXCEPT my friendly local law enforcement officer with his calibrated RADAR gun.

The E4OD has a higher O/D than the ZF. Not sure of the exact difference but would make about 100 RPM lower engine speed, like running 1900 while a 5-spd manual would be running 2000. A truck w/4.10 gears would run 2310 RPM compared to a truck with 3.55's running 2000.

Those speeds & RPM's are ALL accurate with stock sized tires with factory speedo calibration. If your speedo has been recalibrated and your tires are larger or smaller than the factory tires ALL bets are off.
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Old 04-07-2011, 05:55 AM   #10 (permalink)
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2350 rpm at exactly 65 miles per hour, gps confirmed. 5 speed manual transmission with 4.10 gears.
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Old 04-20-2011, 09:54 PM   #11 (permalink)
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i got 97 f250 auto and at 65 im jut right at 1600-1700 rpm with overdrive on
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Old 04-21-2011, 12:58 AM   #12 (permalink)
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To the OP: You have 4.10 gears. The 444E is rated at 2700 rpm & is expected to run there all day every day with no damage. Since we have 444E's essentially that would be my start point. Oh yeah, don't ever exceed 3600 rpm(the only way to achieve this is by being pushed(by load downhill or other vehicle)) becuase then bad things will happen. With 35's on my truck, I'm about 2350 at 70.
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Old 04-21-2011, 05:39 PM   #13 (permalink)
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right at 2300-2350rpm at 65mph
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Old 04-23-2011, 10:59 AM   #14 (permalink)
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Quote:
Originally Posted by angst View Post
Will depend on rear end gear ratio. Like you can see from previous posts a 4:10 rear will put you at about 65mph (or perhaps a hair less) at 2000rpm.
Frugalyankee has a 3:80 or 3:55 rear if I would have to guess since he is 1900 rpm at 65.
At 1900-2000rpm my automatic e40d goes 68.5 and I have a 3:55 rear gear.

For me the tach reads 70mph while doing this though. I have determined through both gps and mile markers that I have about a 3% or 1.5mph odometer error at 65-70mph.
Tire size will also skew your results a little, but point being that your speed at 2000 rpm is a pretty good indication of what rear gear ratio you have.

Way to go on your mileage frugalyankee. Ive hit close to that a few times but I am usually sub 20mpg. The difference between 70mph and 65mph is very tangible in mileage but also takes an equivalent amount of discipline to stay that slow vs going 68 to 70.
It is possible to recalibrate your instrument cluster. I think you can do it 5 times total.
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Old 04-24-2011, 06:09 AM   #15 (permalink)
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You guys know more about my truck than I do lol. I finally checked the door tag and I have 3.55 gears. The way this truck tows a 10K trailer I would have thought for sure it was at least 3.80 gears if not 4.10's. But knew it wasn't 4.10's with the fuel economy. My first diesel and still getting used to difference in power and towing capacity versus a gas engine (replaced a 460 with this truck). Love it and will never go back to gas for towing.
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