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Old 12-26-2010, 10:17 PM   #1
Smokem
 
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AFC simplified

Pre-load adjustment
Click the image to open in full size.
This will determine the off idle quantity of fuel injected before manifold pressure overcomes the spring pressure.

Starwheel
Click the image to open in full size.
Increases or decreases spring tension.

Lever height adjustment
Click the image to open in full size.
Eccentric movement, counter clockwise raises the lever, clockwise lowers the lever.

AFC lever
Click the image to open in full size.
Removing 0.100" from the marked area will provide full travel.
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Old 12-26-2010, 10:19 PM   #2
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160/175/180hp spring on left, 215hp middle, TST on right.
Click the image to open in full size.

In the following picture I compare two springs that began as the same. The spring on the right was heated and stretched to achieve the open pressure desired.
Click the image to open in full size.

160/175hp governor spring on left, 180/215hp governor spring on right.
Click the image to open in full size.
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Last edited by Smokem; 12-26-2010 at 10:22 PM.
 
Old 12-26-2010, 10:19 PM   #3
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Nice!
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Old 12-26-2010, 10:26 PM   #4
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thanks Weston!
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Old 12-26-2010, 10:36 PM   #5
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Spring choice will vary depending on peak boost pressure, and the desired fuel curve. Many of the springs shown will vary in pressure, and can be modified with a little heat to achieve the correct open pressure.

Both stock AFC springs are much too short to be of much use. The TST light/medium springs are the correct length and ~ 20/25psi accordingly. The light stock spring can be stretched to increase open pressure to ~ 30psi, and the heavy stock spring can be stretched to increase open pressure to ~ 45psi. For higher pressure applications, such as twin turbo setups the governor spring works quite well, however the shorter spring from the lower hp P7100's comes up a bit short in free length, and is quite high as far as open pressure is concerned.
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Old 12-26-2010, 10:44 PM   #6
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The washers on the diaphragm should also be modified, or replaced to increase travel. I always set the AFC lever adjustment as low(clockwise) as allowed to prevent the governor arm from hanging/binding. I also always adjust the starwheel to the full travel position and modify the spring accordingly to prevent coil bind issues.

The two things to take into account when adjusting the AFC after reassembly will be it's location when mounted front/rear, and the amount of pre-load on the AFC lever. Every setup is different, and there is no magic number here, trying different locations and pre-load adjustments will be needed to fit each individual case properly.
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Old 12-26-2010, 10:53 PM   #7
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awesome, thanks
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Old 12-26-2010, 11:44 PM   #8
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Great stuff!! Pictures always help me a ton.

I love your write-ups and truly appreciate it!!

Thanks,

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Old 12-26-2010, 11:57 PM   #9
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thanks smokem
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Old 12-27-2010, 01:21 AM   #10
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good one weston.. thanks
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Old 12-27-2010, 01:27 AM   #11
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Awesome write up!
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Old 12-27-2010, 01:59 AM   #12
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Thanks for the info, Weston.

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Old 12-27-2010, 02:28 AM   #13
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Nice write up Weston,
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Old 12-27-2010, 04:32 AM   #14
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Nice thread Weston.
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Old 12-27-2010, 06:46 AM   #15
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Great to see you putting your knowledge back on the boards.
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Old 12-27-2010, 07:26 AM   #16
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great info. Thanks.
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Old 12-27-2010, 08:48 AM   #17
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How does modifying the lever height affect the fueling? Is full fuel achieved when the barrel on the afc arm hits the back of the afc housing or is there a certain millimeter of travel the afc arm needs to move (19-21mm)?
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Old 12-27-2010, 01:24 PM   #18
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Altering the lever height does not affect fueling, but aftermarket governor springs lower the governor arm's relative height to the other parts. Full fuel is when either the washer, or barrel contact and stop movement of the lever.
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Old 12-27-2010, 06:11 PM   #19
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Unmodified AFC washers
Click the image to open in full size.

Modified AFC washers
Click the image to open in full size.

I typically turn the collar down on both washers on the lathe as you can see in the second picture. If you are looking for washers to replace the stock pieces, they are 1.575"/40mm in diameter, 0.060"/1.5mm thick, with a internal diameter of 0.325"/8.25mm.
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Old 12-27-2010, 06:22 PM   #20
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thankyou very helpfull. I had no idea swapping gov spring lowered the arm!
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