P Pump Tuning - Diesel Truck Forum - TheDieselGarage.com
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post #1 of 4 (permalink) Old 08-15-2005, 06:29 PM Thread Starter
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P Pump Tuning

I'm going to try and help explain some tuning techniques for the Bosch P7100. First off, just removing the plate, and the AFC spring is not the best way to go about making power. That takes away you're ability to tune you're fuel delivery. Running with no AFC spring will smoke more and spool slower than modifying the AFC arm. If you take the aneroid housing, turn it upside down and lay a flat fuel plate in it's full forward position, and remove you're AFC spring so you can move the AFC arm front to back, you will see that the foot on the AFC arm will hold the governor arm away from the plate. The AFC arm's job is to hold the govenor arm back until enough boost pressure is built in the manifold to move the diaphram and in turn compress the AFC spring to let the AFC arm and the governor arm move forward. The problem is when you use a flat or large hp plate, the AFC arm extends farther back in the housing than the plate, which means the governor arm rides on the AFC arm instead of the plate. There are 2 ways to fix this. One, move the plate rearward, about 2/3 full forward, this will allow the governor arm to hit the plate. Two, and my favorite, remove the foot on the AFC arm with a cut off tool, and use a flap wheel to smooth everything out. The foot is about 3/16 of an inch. This is a permanent modification, but the fuel curve when used in conjunction with a flat fuel plate is very smooth and easy to tune. If you choose the first option, I recommend using a #10 or #100 plate, because the fuel curve is smoother than the rest of the fuel plates. Be sure to adjust the govenor arm to allow the plate to move up the fuel curve. www.piersdiesel.com Technical - Governor Arm Adjustment.
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post #2 of 4 (permalink) Old 08-15-2005, 08:24 PM
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Thanks for the Info...... This will be really useful to the 12v crowd....
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post #3 of 4 (permalink) Old 06-15-2006, 06:51 AM
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what about the torque screw? / star screw?


95-dodge 2500 built to the hill... - sold to litle brother
03- stroker 6.0 studs and basic BS

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post #4 of 4 (permalink) Old 06-17-2006, 05:02 AM Thread Starter
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The AFC starwheel is located under an allen plug on top of the governor-rack assembly on the back of your pump. There are many tricks to it, but you can always just turn it toward the front of the motor with a small screwdriver.
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