97up-list-digest Saturday, July 4 1998 Volume 01 : Number 138



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Ford Truck Enthusiasts - 1997 and Newer Trucks and Vans
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In this issue:

FTE 97up - Re: V-10 gas mileage
Re: FTE 97up - Tire Pressure Question
Re: FTE 97up - SuperDuty early impressions
Re: FTE 97up - Re: PSD Fuel Economy
Re: FTE 97up - Re: PSD Fuel Economy

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Date: Fri, 03 Jul 1998 08:13:09 -0400
From: Lee Haefele
Subject: FTE 97up - Re: V-10 gas mileage

My 99, F-350 4X4, DRW, V-10, Auto, utility body loaded to 10,000 lb, got
9 mpg on it's 2nd tankful, on rural short trips. This is .5 mpg better
than my 89, 460 std shift, with hope for better with break in. This is
a very nice driving truck, with a soft but controlled ride, even with
heavy service pkg, very steady at high speeds. I have filed a complaint
with Ford, "Not built as ordered", due to it being delivered with vacuum
boost brakes, instead of "Hydro Boost", as specified in order book & on
window sticker. The vacuum boost brakes require too much pedal
pressure at this weight, the dealer has replaced the booster & checked
the vacuum. Only gas engines can have this setup. Otherwise, no
quality problems at all.
Lee Haefele
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Date: Fri, 03 Jul 1998 10:58:16 -0400
From: "jmc.chartier"
Subject: Re: FTE 97up - Tire Pressure Question

Kevin Hutchinson wrote:

> Hi,
>
> I've got a 98 F150 4x4 with about 500 miles on it. The tires on are the
> P255 Goodyear Wrangler's and when I got the truck the tire pressure was set
> at about 40 psi cold. I looked at the tire itself and it said 35 psi max
> cold. When I checked the sticker in the door, it says 29 psi front and I
> think
> it was 32 rear. My question is which is correct? I did back the tries off to
> 35 psi, but at 29 for the front the tires almost look flat. (yes my tire
> guage is
> acturate).
>
> Thanks,
>
> Kevin
>
> Kevin,

Trust the door sticker. I run 29 front and 32 rear on mine. I have the ORP
265/70R 17's

Regards

Jean Marc Chartier


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Date: Fri, 3 Jul 1998 14:50:17 EDT
From: BigFords1 aol.com
Subject: Re: FTE 97up - SuperDuty early impressions

Early Impressions: Better ride, more power, BIGGER, more solid (less body
flex), more durable.
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Date: Fri, 3 Jul 1998 15:00:23 EDT
From: BigFords1 aol.com
Subject: Re: FTE 97up - Re: PSD Fuel Economy

I think you have too much time on your hands.

l
l
l
\l/
ormula to determine radius of tire:
((((225 * .70) * 2)/ 25.4) + 19.5) * 3.142 = 100.234 inches per rotation
[sect.][aspect][side-][mm to][wheel][pie]
[width][ratio] [walls][inch ][size ]

63360 / 100.234 = 632.116 tire revolutions per mile
[in /] [rev /]
[mi. ] [in. ]

Formula to determine drive ratio:
(4.88 * .72) = 3.513 engine revolutions per 1 axle revolution
[axle ][trans]
[ratio][ratio]

Formula to determine engine RPM:
((632.116 * 3.513) / 60) * speed =
[tire rev /][engine][time][speed]
[mile ][rev ]
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Date: Fri, 03 Jul 1998 22:03:07 -0700
From: Bob Illingworth
Subject: Re: FTE 97up - Re: PSD Fuel Economy


Your calculations are right on, Randy. The 550 pickup tips the scale at
8800 lbs empty.
still no excuse for 8 MPG on flat level ground using  the cruise
control.
I talked to a cat engine tech today and he says the factory computer
thinks this truck it loaded and weighs 18000 lbs. One of the questions
asked when reprogramming the computer is the Gross Vehicle Weight. I am
going in monday for a reprogram and we are going to try to lie to the computer
and tell it the GVW is 8000 lbs and see what happens.

I'll keep you posted.

Have a great 4th

Bob I

Randy Robb wrote:
Actually 2400 rpm at 65 is mathematically correct.

Tire size is 225/70R 19.5

Formula to determine radius of tire:
((((225 * .70) * 2)/ 25.4) + 19.5) * 3.142 = 100.234 inches per rotation
 [sect.][aspect][side-][mm to][wheel][pie]
 [width][ratio] [walls][inch ][size ]

63360 / 100.234 = 632.116 tire revolutions per mile
[in /]  [rev /]
[mi. ]  [in.  ]

Formula to determine drive ratio:
(4.88 * .72) = 3.513 engine revolutions per 1 axle revolution
[axle ][trans]
[ratio][ratio]

Formula to determine engine RPM:
((632.116 * 3.513) / 60) * speed =
[tire rev /][engine][time][speed]
[mile      ][rev   ]

1665 rpm 45 mph
1850 rpm 50 mph
2035 rpm 55 mph
2221 rpm 60 mph
2406 rpm 65 mph
2591 rpm 70 mph
2776 rpm 75 mph

This does not factor in the weight of truck and cargo flattening the
tires, so actual rpms would be slightly higher.
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End of 97up-list-digest V1 #138
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