HIGH Cruising Boost - Ford Powerstroke Diesel Forum
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post #1 of 8 Old 02-09-2012, 04:31 AM Thread Starter
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HIGH Cruising Boost

Going 70MPH, level ground, wind 5MPH or less, shouldn't I get around 4PSI boost or something close? Basically little to nothing right?
I get 9-10PSI.
Yea, I know I have more rolling resistance since it's a dually, more weight with the fuel tank, tool box and stuff in the box, but I didn't think it'd make that much of a difference.



2000 F-350 Lariat Super Duty, Dually, CCLB, 7.3L
4R100, 2wd
330,000 + miles
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post #2 of 8 Old 02-09-2012, 04:54 AM
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Mine isn't a dually but running like you mentioned, full of fuel, estimated 500 lbs in back with tool box and goodies i see around 5psi. I don't see numbers like you're seeing unless I have a trailer.

Jason

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post #3 of 8 Old 02-09-2012, 07:57 AM
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Faulty gauge? Has it always done this or did it start recently? Any change in MPG? (If it started recently) I think you would have noticed, but are the brakes dragging? I'm even not sure if that would cause enough resistance to double the boost.

Alan
2000 F-350 CC LB DRW 4x4 XLT Auto

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post #4 of 8 Old 02-09-2012, 08:10 AM
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Do you have 4.10s in your truck? That's probably why. I'm sure us srw guys with 3.73s are at the same boost numbers at that rpm.

Zach
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post #5 of 8 Old 02-09-2012, 09:28 AM Thread Starter
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Gauge works great. 4.10s, yes since it's a dually. That means at 70 I'm running about 2200RPM. At 55 it's about 17-1800RPM and that's where I get my 2-3PSI. But 2050RPM and above, that sucker really is lit up. I LOVE it



2000 F-350 Lariat Super Duty, Dually, CCLB, 7.3L
4R100, 2wd
330,000 + miles
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post #6 of 8 Old 02-09-2012, 09:47 AM
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I'd say thats about normal then. I'm at 6 psi at 2000 RPM/76-77 MPH with my 35s.

Zach
2000/2006ish Ford F-250 Larryette 7.3 Powerstroke 4x4
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post #7 of 8 Old 02-09-2012, 12:10 PM
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I have a dually, 4:10s and run about 9 inches of boost @70, 10 inches if I'm buckin a headwind.

12/98 E-99 CC Long Box 4WD Dually Lariat, Banks IC/Wastegate/6-Gun........Heated/Cooled Cupholders
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post #8 of 8 Old 02-09-2012, 02:23 PM Thread Starter
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Ok cool. I knew it wasn't over boosting just didn't realize it would go that high just cruising



2000 F-350 Lariat Super Duty, Dually, CCLB, 7.3L
4R100, 2wd
330,000 + miles
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