After tweaking the pump and getting it like I wanted,I had to turn down the idle.Problem is adjustment is all the way down to where it won't even hit the stop,I have plenty of thread left on the bolt,just not sure what to do about this.Any ideas on a little less idle? Thanks in advance,I really enjoy this site.
RM
P.S. What about installing an intercooler would it be worth it.

90.. straight pipe..modified air intake with K&N..pump tweaked

 

Normally if you can't get your idle down where it belongs, you are getting close to having the governor run away on the pump -- turning the "power screw" changes the geometry of the governor linkage slightly, until you reach a point where the governor can no longer push properly to shut off the fuel . . .

Just be careful, and find the compromise pump settings that work for you. If you haven't maxxed the AFC, do that, and then back off on the "power screw" a little bit.

 

You may also have to adjust your throttle linkage from the cable to the foot pedal and the lever from the rocker assembly to the pump. All these adjustments have to be made to allow full travel of the pump lever. If you pop the lever off of the ball joint at the pump or the rocker lever, see if the pump will rest on the idle stop. If not you are outside of the pumps ability to idle an you will have to turn down the full fuel screw a bit.

(edit) Also check the cruise control cable to make sure it is not hangin up on idle. I had to pull the little clip and move the cable in to let the linkage go to idle position..

After you have adjusted the linkage for idle, also make sure you get full travel to the governor stop at WOT. I found I had to do some fancy grinding on the rocker assembly, and bending of the foot pedal to get full travel from stop to stop.

J-eh

 

Whether or not you need an intercooler depends on what you do with the truck. If it's just a play truck, you don't need it. If you're turning it up for better towing, the intercooler will let you use more of that new-found power by keeping the EGT's down on long hills.

 

Thanks to all,the advise is appreciated.I will follow thru on the linkage & throttle adjustments,& yes it's just a play toy. I was curious about the intercooler to see if it would give me a little more oomph. This bombing stuff is addictive.
RM
90.. straight pipe..modified air intake with K&N..pump tweaked

 

Lildog about covered it. the thing I found like he said is that you dont get full travel with the way the factory set it up. that linkage unit with the spring on it can be modified. work it by hand and watch how the stops limit it in both directions. and take a die grinder and take some metal off and you will gain travel in both directions.

 

What happens if you adjust the wot stop screw in some more,where the spring loaded plate hits. Will it allow more fuel or top end speed?
RM
90.. straight pipe..modified air intake with K&N..pump tweaked

 

The max governor setting at WOT will give you more fuel up to the full speed range of the engine, sort of a poor mans governor spring .

I originally at stock would get the boost to roll off near the 2500 RPM mark and you wouldn't gain any speed. I have since opened up the governor to allow full fuel to about 2900 Rpm. Carefull though, if you pin it on ice or wet pavement I have reved to over 3200 without much effort

Also if you take your truck in for service, make sure to tell the technitions you have opened the governor. They usually test no-load RPM and may find it goes to 3500 without watching the tach..

J-eh