changing tire size - Ford Powerstroke Diesel Forum
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post #1 of 15 Old 01-28-2008, 07:35 AM Thread Starter
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changing tire size

I have a 2000 E350 superduty with an Auto tranny. It runs down the highway at 70 at 2400 RPM and is getting right at 13.5 mpg has anyone put taller tires on one of these to lower the RPMs to get better mileage...right now it has 215/85-16 and that is the stock size....thanks
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post #2 of 15 Old 01-28-2008, 07:51 AM
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You need to drop it to around 2K for the best economy. Do you have 3.73 or 4.10 gears?

Early 99 (Born on 11-20-98) F350 CC LWB 4X4
north of 480hp and south of 13.7sec
Bored with current setup

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post #3 of 15 Old 01-28-2008, 07:56 AM
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Yeah I don't know a whole lot about the vans, but you should be able to fit some 225's on it possibly 235's. That should help lower the rpm's.

Pat

2000 F250 Carpenter's Union local 2214 LOOKING FOR SIDE JOBS

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post #4 of 15 Old 01-28-2008, 08:01 AM Thread Starter
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I meant F350...although I do have an E350 boxvan that we race moto out of, but im phasing that out because i bought a toybox trailer
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post #5 of 15 Old 01-28-2008, 08:07 AM
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Is it a dually? That is not the standard size tires on a singel rear wheel. Single Rear wheel come with 265-75-16

Early 99 (Born on 11-20-98) F350 CC LWB 4X4
north of 480hp and south of 13.7sec
Bored with current setup

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post #6 of 15 Old 01-28-2008, 08:08 AM
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Okay you have an F350 big difference. There are guys on here running 265's without spacers in the rear. That should really drop your rpm's and get you better mileage.

Pat

2000 F250 Carpenter's Union local 2214 LOOKING FOR SIDE JOBS

Mac intake,5" exhaust with6" tip,Zoodad,foil delete, ts chip, WW

96 E350 bad trans mod NO MORE.
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post #7 of 15 Old 01-28-2008, 08:20 AM Thread Starter
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265/85s? or 75s and ya its a dually
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post #8 of 15 Old 01-28-2008, 08:22 AM
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265 75 16 is about all your going to fit on a dually without spacers. If you had a single wheel you could do up to 305's without a problem.

Pat

2000 F250 Carpenter's Union local 2214 LOOKING FOR SIDE JOBS

Mac intake,5" exhaust with6" tip,Zoodad,foil delete, ts chip, WW

96 E350 bad trans mod NO MORE.
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post #9 of 15 Old 01-28-2008, 08:52 AM
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i have an f-250 and i got 315/75-16s on it and they look awesome and do a little better on fuel but it is a single rear wheel


2003 7.3L
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post #10 of 15 Old 01-28-2008, 06:31 PM
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Quote:
Originally Posted by GoldieStroker944 View Post
i have an f-250 and i got 315/75-16s on it and they look awesome and do a little better on fuel but it is a single rear wheel
I asked about mileage with 315's on another post. Most claim a loss in mileage due to the need for more power to turn the tire. I'm sure that is true
for a stock truck. But i've got a well modded truck. What was the difference you saw between the stock tires and the 315's?
Thanks, D

2000 F350 Crewcab 4x4 7.3l with AFE stage II, MBRP 4" turbo back, Turbonetics "Quick spool" turbo with .84 housing, DP Tuner chip, 80 tow,80 econo, 120 race.
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