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10-28-2017, 05:13 PM
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#1
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Name: turbo2387
Title: Nipple Fluffer
Status: Not Here
Join Date: Jun 2011
Location: Indiana
Member`s Gallery
Posts: 665
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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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10-28-2017, 05:26 PM
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#2
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Name: jasonc
Title: Too Much Time
Status: Not Here
Join Date: Nov 2009
Member`s Gallery
Posts: 4,412
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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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10-28-2017, 05:26 PM
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#3
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Name: CorneliusRox
Title: Seasoned Rookie
Status: Not Here
Join Date: Dec 2012
Location: Detroit, MI
Member`s Gallery
Posts: 4,154
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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.
__________________
Corey - BSME '21 Tesla Model 3 Perf
'22 DMax AT4 2500
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10-28-2017, 05:28 PM
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#4
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Name: jasonc
Title: Too Much Time
Status: Not Here
Join Date: Nov 2009
Member`s Gallery
Posts: 4,412
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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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10-28-2017, 05:30 PM
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#5
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Name: turbo2387
Title: Nipple Fluffer
Status: Not Here
Join Date: Jun 2011
Location: Indiana
Member`s Gallery
Posts: 665
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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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10-28-2017, 05:32 PM
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#6
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Name: CorneliusRox
Title: Seasoned Rookie
Status: Not Here
Join Date: Dec 2012
Location: Detroit, MI
Member`s Gallery
Posts: 4,154
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Quote:
Originally Posted by turbo2387
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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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.
__________________
Corey - BSME '21 Tesla Model 3 Perf
'22 DMax AT4 2500
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10-28-2017, 05:33 PM
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#7
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Name: jasonc
Title: Too Much Time
Status: Not Here
Join Date: Nov 2009
Member`s Gallery
Posts: 4,412
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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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10-28-2017, 05:38 PM
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#8
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Name: turbo2387
Title: Nipple Fluffer
Status: Not Here
Join Date: Jun 2011
Location: Indiana
Member`s Gallery
Posts: 665
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Quote:
Originally Posted by jasonc
Go with a light spring and regulate the input air, it works perfect and easier to fine tune.
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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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10-28-2017, 05:43 PM
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#9
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Name: jasonc
Title: Too Much Time
Status: Not Here
Join Date: Nov 2009
Member`s Gallery
Posts: 4,412
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Or just turn the regulator down.
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10-28-2017, 05:49 PM
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#10
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Name: turbo2387
Title: Nipple Fluffer
Status: Not Here
Join Date: Jun 2011
Location: Indiana
Member`s Gallery
Posts: 665
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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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10-28-2017, 05:55 PM
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#11
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Name: jasonc
Title: Too Much Time
Status: Not Here
Join Date: Nov 2009
Member`s Gallery
Posts: 4,412
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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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10-28-2017, 06:01 PM
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#12
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Name: jasonc
Title: Too Much Time
Status: Not Here
Join Date: Nov 2009
Member`s Gallery
Posts: 4,412
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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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10-28-2017, 06:06 PM
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#13
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Name: turbo2387
Title: Nipple Fluffer
Status: Not Here
Join Date: Jun 2011
Location: Indiana
Member`s Gallery
Posts: 665
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Running a 100
Stock plate ground flush to the top plate.
Auto trans
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10-28-2017, 06:08 PM
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#14
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Name: jasonc
Title: Too Much Time
Status: Not Here
Join Date: Nov 2009
Member`s Gallery
Posts: 4,412
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What's the max boost you see now?
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10-28-2017, 06:11 PM
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#15
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Name: turbo2387
Title: Nipple Fluffer
Status: Not Here
Join Date: Jun 2011
Location: Indiana
Member`s Gallery
Posts: 665
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I can get 68-70
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10-28-2017, 06:18 PM
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#16
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Name: jasonc
Title: Too Much Time
Status: Not Here
Join Date: Nov 2009
Member`s Gallery
Posts: 4,412
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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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10-28-2017, 10:34 PM
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#17
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Name: DieselAdict
Title: If I Had The $ I Would...
Status: Not Here
Join Date: Apr 2015
Location: Greenfield, Indiana
Member`s Gallery
Posts: 31
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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.
__________________
96 Dodge 2500, 66/71/16 S300 w/HTT gated housing, 4k's, 24* Timing, 191dv's, 5x18 IIR4 Injectors, 125lb Vsprings, Fass125, Built Auto(Built by Me) w/ Goerend Constant Pressure VB
2015 VW Jetta TDI 2.0L (Best Mileage as of yet 58MPG)
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10-29-2017, 06:01 AM
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#18
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Name: zstroken
Title: For $$$ your name here
Status: Not Here
Join Date: Sep 2006
Location: Western Michigan(by the lake)
Member`s Gallery
Posts: 23,151
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I always sat mine up on a bench with a regulator hooked up.
__________________
2008 4x4 Megacab, 68RFE
97 Dodge gone....
24V P-Pump Mafia member #1(retired)
Thanks to Mumau Diesel, Goerend Transmission, Northeast Diesel Service!
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10-29-2017, 06:28 AM
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#19
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Name: turbo2387
Title: Nipple Fluffer
Status: Not Here
Join Date: Jun 2011
Location: Indiana
Member`s Gallery
Posts: 665
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Quote:
Originally Posted by zstroken
I always sat mine up on a bench with a regulator hooked up.
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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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10-29-2017, 10:53 AM
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#20
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Name: turbo2387
Title: Nipple Fluffer
Status: Not Here
Join Date: Jun 2011
Location: Indiana
Member`s Gallery
Posts: 665
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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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