97up-list-digest Friday, July 3 1998 Volume 01 : Number 137



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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
Re: FTE 97up - Re: Powerstroke economy & oil change interval
FTE 97up - Re: PSD Fuel Economy
FTE 97up - Re: PSD Fuel Economy
FTE 97up - Tire Pressure Question

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Date: Thu, 02 Jul 1998 07:28:33 -0400
From: Lee Haefele
Subject: FTE 97up - Re:V-10

>Well there ain't no V-10s now.He had to spend the xtra $4445.00 for the >PSD.

Dealer cost is only approx $3400, If you upgraded your existing order,
that is all you should pay...or shop around.
Lee Haefele
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Date: Thu, 2 Jul 1998 07:41:59 EDT
From: John941 aol.com
Subject: Re: FTE 97up - Re: Powerstroke economy & oil change interval

I just drove 192 miles from Key Largo, Florida to Fort Myers Florida right
across the Everglades. My F250 4x4 CC PSD with 800 miles on it got 18.2 mph.
This is absolutely flat land but with the a/c cranking and I did not take it
easy(65-75 mph). I could not be happier with that milage. It is 82% better
then my old 454 chevy
John
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Date: Thu, 02 Jul 1998 09:00:11 -0500
From: Randy Robb
Subject: FTE 97up - Re: PSD Fuel Economy

The F450 - F550 does come with the 4.88 axle ratio. But they also come
with 225/70Rx19.5 tires.
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Date: Thu, 02 Jul 1998 12:20:54 -0500
From: Randy Robb
Subject: FTE 97up - Re: PSD Fuel Economy

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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Date: Thu, 2 Jul 1998 19:16:20 -0600
From: "Kevin Hutchinson"
Subject: FTE 97up - Tire Pressure Question

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

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End of 97up-list-digest V1 #137
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