Do optimal rpms change with a programmer? - Ford Powerstroke Diesel Forum
 
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post #1 of 9 Old 07-15-2007, 04:52 PM Thread Starter
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Do optimal rpms change with a programmer?

I've seen a couple threads here talking about MPG efficiency. Several people have stated that they see the best MPG when their RPMs are in the 2000-2250 range. Is that the going concensus of a good range to target RPMs at?

Using the Juice on my 6.0l, I'm not seeing 2000 RPMs until around 76 MPH. I don't hit 2250 until around 86 MPH. I bought the truck used, and I *think* it was regeared, but I'm not sure. Can I run my truck at 76-86 MPH for the best MPG? If so, you've just made me a very very happy trucker!
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post #2 of 9 Old 07-15-2007, 04:58 PM
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I have an '01 7.3 with 3.73's and my best mileage is just under 2000 - around 1800-1900 @ 65-68 MPH.. . I can get about 19-20 MPG at that speed if all I do is drive highway ---- that was completely stock.
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post #3 of 9 Old 07-15-2007, 05:00 PM
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i have a stock 96er with a 4spd auto tranny with 4.10 rear, i get my best mpg's at about 65mph @ 2000rpm.

if you see a light at the end of the tunnel, it's probably just a photon torpedo
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post #4 of 9 Old 07-15-2007, 05:06 PM
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keep it under 2000 rpms and 500 EGT or so and you'll see your best mileage. Also keep your programmer set up on its highest power levels... If you can keep your foot out of it that'll help a lot too.

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post #5 of 9 Old 07-15-2007, 05:18 PM Thread Starter
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Quote:
Originally Posted by shu873 View Post
keep it under 2000 rpms and 500 EGT or so and you'll see your best mileage. Also keep your programmer set up on its highest power levels... If you can keep your foot out of it that'll help a lot too.
But, as I've stated, under 2000 RPMs for me is 75MPH! I can run that and still get good MPG?! That's a dream come true!

****, Blue01F250, I'd do a happy dance right in the fillup station if I got 19-20. But, with a 6" lift, and 35" tires, it probably ain't gonna happen...
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post #6 of 9 Old 07-15-2007, 05:23 PM
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lol - yah - but i drive a 2wd with stock size tires

as for adding a programmer - i'll have to let you know when I get the funds to add one.. lol and this truck has definately slowed me down on the highway - trying to see how good of mileage I can get! Its a challenge!
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post #7 of 9 Old 07-16-2007, 12:02 PM Thread Starter
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Price it out... I bet it wouldn't take more than a year to give you 100% ROI!
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post #8 of 9 Old 07-17-2007, 04:58 AM
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Oh, I know the price for all the stuff I will end up putting on my truck will take years to make up in gas savings... but it is nice to have the power - keep EGT's down - and still get better mileage.

If MPG were all I was after, I definately wouldn't have already dropped $400 on an Intake and Exhaust..
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post #9 of 9 Old 07-19-2007, 02:25 PM
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Quote:
Originally Posted by eyesonly View Post
Using the Juice on my 6.0l, I'm not seeing 2000 RPMs until around 76 MPH. I don't hit 2250 until around 86 MPH. I bought the truck used, and I *think* it was regeared, but I'm not sure. Can I run my truck at 76-86 MPH for the best MPG? If so, you've just made me a very very happy trucker!
Programmer has absolutely nothing to do with RPM vs speed - that the rear end ratio. Heck, with my 4.30 gears, I hit 2000RPM at 60MPH, 2250RPM is a tad under 70.

Almost appears that the previous owner of your truck dropped down to 3.55 gears as my friend with the 3.73 gears sees 2000RPM at 70MPH.

You don't have to drive it at 2000RPM, you want to keep it under 2000RPM for best milage. When I keep mine at around 1500RPM (about 45), I get better milage than I do at 60.

Larry

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Last edited by 2006KR; 07-19-2007 at 02:26 PM. Reason: clarity
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