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12-26-2010, 09:17 PM
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#1
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Name: Smokem
Title: Turbler
Status: Not Here
Join Date: May 2006
Location: Iowa
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Posts: 5,565
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AFC simplified
Pre-load adjustment
This will determine the off idle quantity of fuel injected before manifold pressure overcomes the spring pressure.
Starwheel
Increases or decreases spring tension.
Lever height adjustment
Eccentric movement, counter clockwise raises the lever, clockwise lowers the lever.
AFC lever
Removing 0.100" from the marked area will provide full travel.
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12-26-2010, 09:19 PM
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#2
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Name: Smokem
Title: Turbler
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Location: Iowa
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160/175/180hp spring on left, 215hp middle, TST on right.
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.
160/175hp governor spring on left, 180/215hp governor spring on right.
Last edited by Smokem; 12-26-2010 at 09:22 PM.
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12-26-2010, 09:19 PM
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#3
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Name: cummins724
Title: BREAKING $HIT
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Nice!
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12-26-2010, 09:26 PM
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#4
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Name: Mr.T
Title: DPF's are gay
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thanks Weston!
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2019 L5P, missing some stuff that makes it quiet.
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12-26-2010, 09:36 PM
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#5
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Name: Smokem
Title: Turbler
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Location: Iowa
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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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12-26-2010, 09:44 PM
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#6
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Name: Smokem
Title: Turbler
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Join Date: May 2006
Location: Iowa
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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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12-26-2010, 09:53 PM
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#7
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Name: OrangeNV
Title: BISH please
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awesome, thanks
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12-26-2010, 10:44 PM
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#8
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Name: Smoken Gun
Title: Diaboli parum adiutor.
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Great stuff!! Pictures always help me a ton.
I love your write-ups and truly appreciate it!!
Thanks,
Garrett
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12-26-2010, 10:57 PM
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#9
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Name: not enoughsmoke
Title: floatin in tha gulf
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thanks smokem
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12-27-2010, 12:21 AM
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#10
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Name: DEZLFREK
Title: my licence plate says it
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good one weston.. thanks
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12-27-2010, 12:27 AM
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#11
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Name: RJM06590
Title: What to do
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Awesome write up!
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12-27-2010, 12:59 AM
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#12
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Name: ride42
Title: 980MW
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Thanks for the info, Weston.
Sent from my DROIDX using Tapatalk
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Bryce
Out of sight, out of mind.
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12-27-2010, 01:28 AM
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#13
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Name: TMONEYDIESEL
Title: Comp Diesel Sponsor
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Nice write up Weston,
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12-27-2010, 03:32 AM
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#14
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Name: explosives87
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Nice thread Weston.
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12-27-2010, 05:46 AM
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#15
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Name: relay93
Title: Diesel Enthusiast
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Great to see you putting your knowledge back on the boards.
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12-27-2010, 06:26 AM
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#16
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Name: jdjanetka
Title: Rookie
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great info. Thanks.
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95 2500 rebuilt 47rh w/ 48re planetaries,triple dsk t/c and transgo kit.#6 plate ddp#2 57/62-12 s300 356hp/825tq.
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12-27-2010, 07:48 AM
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#17
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Name: BgBlDodge
Title: Hates hippies
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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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12-27-2010, 12:24 PM
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#18
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Name: Smokem
Title: Turbler
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Location: Iowa
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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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12-27-2010, 05:11 PM
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#19
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Name: Smokem
Title: Turbler
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Join Date: May 2006
Location: Iowa
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Unmodified AFC washers
Modified AFC washers
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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12-27-2010, 05:22 PM
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#20
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Name: jaybuller
Title: USCG MK
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Posts: 1,446
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thankyou very helpfull. I had no idea swapping gov spring lowered the arm!
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