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Old 10-28-2017, 06:13 PM   #1
turbo2387
 
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AFC foot movement and psi questions

At what % foot movement does the afc foot get out of the way and the fuel plate takes over

In a street driven compound set-up what kind of psi works well in conjunction with foot movement.

Stock movement on the shaft is approximately

Initial 0-2psi
Half 15
Full 22
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Old 10-28-2017, 06:26 PM   #2
jasonc

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In quick spool compounds mine was 40 max travel. Used an inner BBC valve spring and cut a coil and half off. Or stay with the light spring and run a regulator, that's what I'd do.
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Old 10-28-2017, 06:26 PM   #3
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I aim to supply full movement at around 75% full pressure. The fuel plate is RPM based, and the AFC is pressure based. I honestly like how it feels better without the plate for street driving.
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Old 10-28-2017, 06:28 PM   #4
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On a 12mm pump i see no reason to run a plate, afc can handle.it all.
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Old 10-28-2017, 06:30 PM   #5
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Stiffer springs seem to work better on fuel control for me. Just found a spring that is

15
30
50

Im concerned about the initial movement at 15psi.
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Old 10-28-2017, 06:32 PM   #6
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Quote:
Originally Posted by turbo2387 View Post
Stiffer springs seem to work better on fuel control for me. Just found a spring that is

15
30
50

Im concerned about the initial movement at 15psi.
x2

I'm running full travel at about 38psi. I used a gov spring out of something. I can't remember what. We've got a thread on here somewhere with the info though.
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Old 10-28-2017, 06:33 PM   #7
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Go with a light spring and regulate the input air, it works perfect and easier to fine tune.
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Old 10-28-2017, 06:38 PM   #8
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Quote:
Originally Posted by jasonc View Post
Go with a light spring and regulate the input air, it works perfect and easier to fine tune.
Ukkk... more stuff that doesnt look pretty


With the new quickrate pump i plan on going with larger injectors. Wonder how the appropriate amount of pre boost would work. When i tow heavy i often sit at about 20psi.
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Old 10-28-2017, 06:43 PM   #9
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Or just turn the regulator down.
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Old 10-28-2017, 06:49 PM   #10
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Question still is. At what movement % does the foot get out of the way for the plate? Because ide like things to get rowdy around 25psi but a drivable usable truck under that.
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Old 10-28-2017, 06:55 PM   #11
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What kind of plate are you running? The flat ones just limit travel. It should be all on the afc.
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Old 10-28-2017, 07:01 PM   #12
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Auto trans need a good afc so you are pulling back on the tv lever, manual valve body or trans you can set them where you like it.
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Old 10-28-2017, 07:06 PM   #13
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Running a 100
Stock plate ground flush to the top plate.
Auto trans
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Old 10-28-2017, 07:08 PM   #14
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What's the max boost you see now?
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Old 10-28-2017, 07:11 PM   #15
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I can get 68-70
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Old 10-28-2017, 07:18 PM   #16
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I bet you'd like no plate and a spring that takes 40psi to max the afc, or keep your light spring and splice in a regulator and set it to need 40psi to reach max travel.
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Old 10-28-2017, 11:34 PM   #17
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So the goal is to figure out when the afc foot gets out of the way. To determine when the afc reaches full travel how much, if any, rack travel is left. How much rack travel after the afc, fuel plate or not.
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Old 10-29-2017, 07:01 AM   #18
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I always sat mine up on a bench with a regulator hooked up.
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Old 10-29-2017, 07:28 AM   #19
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Quote:
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I always sat mine up on a bench with a regulator hooked up.
I do all mine like this. But without a cut away on the pump the transition from the foot to the plate is a guess. Im probably just over thinking that part of it.
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Old 10-29-2017, 11:53 AM   #20
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So i drove the truck around with the stiff spring in it and man what a noticable difference. Its like have 2 stages of fuel. It is easy to build boost and go nuts from a roll but if you lug it. Like is common when you tow. It doesnt matter how hard you mash the go pedal. You get a light haze and boost slowly comes back to life. You do not get plumes of smoke and spinning tires. I very much wanna hook up to the traler and tractor and give it a go.
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