From: grntrks@juno.com
Date: Fri Dec 17 2004 - 23:41:00 PST
Bjorn,
I just had my injectors replaced and had the fuel turned up on my "91
F350 7.3 diesel. I now have much more power than before ( good ) but temp
is now a factor. I cannot watch the speedo as before, but MUST watch the
tach and temp guages, at all times. I also have to monitor the right
mirror to watch for smoke. If I see smoke I am giving her to much
throttle and have to back out of it until there is no smoke, or she
overheats QUICKLY. RPM is also a major factor in keeping the temp down.
Under a load here is the combination == lower gear, higher rpm, less
throttle equals acceptable temp, but slower speeds
I should note here that even though the fuel is turned up we did not
exceed Ford spec limits. Fuel was at 92 ( from factory ) and is now at
117. Ford limits are 90 to 120. The replacment injectors are also
hi-performance versus the original factory injectors. The power
difference is impressive, but there is now the temperature situation
that absolutely must be monitored at all times when I'm pulling a load.
I've had to "re-learn" my driving habits.
Hope this helps you decide about turning up the fuel.
P.S. My truck has a manual 5 speed overdrive transmission
Frank Cox ' Nam 1966
MVPA 14530
'45 GMC 353 DUKW
"On-A-Mission" hot shot trucking
On Fri, 17 Dec 2004 15:35:12 -0500 "Bjorn Brandstedt"
<super_deuce@hotmail.com> writes:
> Drove back to the sawmill again today for another load of lumber.
>
> The road has a lot of ups and downs and I speed down one hill to get
> the
> momentum going for the next hill. I'm in 5th going downhill at about
> 50-55
> mph. It's enough to make it halfway up the next hill and I watch the
>
> pyrometer every time, since it hits 1,100 to 1,200 degrees as soon
> as the
> engine gets loaded down. I easy off on the "gas" and shift down at
> about
> 1,400 rpm.
> My point is that without the pyrometer, it would be so easy to just
> keep
> stepping on the gas to keep the speed up going uphill, but the EGT
> would be
> way over 1,200 deg F in a very short time.
>
> I think my question here is: Am I running too lean? Should the fuel
> delivery
> be turned up?
>
> Tire pressure observation:
> The total vehicle weight was about 21,000 lb today again. There were
> a lot
> of 14 ft long boards in the load that hung over the back by about 4
> feet.
> The result was that the front was very light and I enjoyed "power
> steering"
> all the way home.
>
> This morning the tire pressures were all about 66 psi.
>
> Arriving at the mill: Front 75 psi and rear 70.
>
> Returning home the tire pressures were checked again: Front 73 psi
> and rear
> averaged 77 psi. The difference reflecting the loading. The rear
> tires were
> also warmer to the touch.
>
> The fuel milage was too good to be made official. I use a dip stick
> in the
> fuel tank to measure the level and it used only 5/8 inch for one 22
> mile
> drive ( with load, no less). That comes out to about 2 gallons, for
> 10
> miles/gallon! The interaxle drive shaft is removed. The front wheels
> are not
> freewheeling because without the drive shaft in the back, front
> wheel drive
> is needed from time to time.
> The tires in the front are brand new and the drive axle in the back
> has been
> removed since they were installed. After 350 miles, the tires show no
> signs
> of wear at all. New shocks were also installed.
>
> Bjorn
>
>
>
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Frank Cox ' Nam 1966
MVPA 14530
'45 GMC 353 DUKW
"On-A-Mission" hot shot trucking
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