simple afc question

95ram

95ram

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Oct 6, 2006
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I've read just about every AFC post for the past 3 yrs half a dozen times. Here's the deal, I replaced both of the washers in the AFC with flat washers with the dimensions Smokem gave in his thread. When I go to screw on the rear housing with the smoke screw it pushes the AFC foot and barrel assembly forward 3mm when tightened down. Is this right or should the barrel not move from touching the rear of the housing?
 
Back the pre-load screw all the way out when assembling the AFC, then turn this adjustment until it begins to move the lever, tighten the lock nut. This is the lowest starting point, if you need more low end fuel turn this adjustment in until desired.
 
Are You saying that it moves when you put the afc back on the pump? Or when you start to turn the pre boost fuel screw?
 
Chevycummins said:
Are You saying that it moves when you put the afc back on the pump? Or when you start to turn the pre boost fuel screw?
Click to expand...

Nope. This is with the AFC off the pickup. Let's say I've got it disassembled to replace the spring. When I go to put it back together and I'm tightening the 4 screws on the back it pushes the foot/barrel assembely forward 3mm from fully back (barrell touching the rear of the housing).

To me it's almost like the washer on the rear cover side is hitting the dome part of the rear cover where the smoke screw is, and pushing the foot slightly forward.
 
What washers did you use? It is possible if they are too thick or bigger diameter.
 
I'll have to check the thickness this weekend. I do know they are not abnormally thick, just a regualar washer.
 
Put the old ones back in and see if it still does it. That will let you know if its something else. If the washers are the issue just grind the lip off the original washer and use them.
 
I think when I was last at Lowe's they had a washer that was a ch too big in diameter, do you have a set of calipers to measure the exact size of the washer?
 
When you put it back together like this and put it on the truck does it cause a lot of low end smoke?
 
I do have calipers and will measure them when I take them out.

I wouldn't say it makes a lot of low end smoke, but a haze. I'd like to be able to take a little more out of it though.
 
I do not believe that you can have the lever flush with the rear of the housing without modifying the shaft it attaches to. I have turned down the thread above the nut to achieve what I believe you are looking for.
 
So here are the washer measurements

1.7mm thick
8.6mm hole
38mm accross

Do these sound about right? I put the TST light spring in tonight and drove it down the driveway a few times until it felt okay. I'll have to do some more tomorrow. It's hard to tune this thing when it's 36* one day and 77* the next. The little bit I did drive it it was a little doggy off the line with the AFC half way, star wheel just about all the way forward, and the smoke screw just touching.
 
i also have a question about acouple AFC's i have that ive been playing with, what is the max travel of the foot that can be acomplished? i've got one with alot of time and head scratching that has 21mm of travel. i never measured what a stock one is though to compare it
 
Smokem said:
I do not believe that you can have the lever flush with the rear of the housing without modifying the shaft it attaches to. I have turned down the thread above the nut to achieve what I believe you are looking for.
Click to expand...
I think I might do that to mine.
 
Smokem said:
I do not believe that you can have the lever flush with the rear of the housing without modifying the shaft it attaches to. I have turned down the thread above the nut to achieve what I believe you are looking for.
Click to expand...

Agreed, always better to have less then adjust to more!

Jim
 
Thanks guys. I just need to spend some time messing with the AFC and learning about it. I know I can't the the TST to 25psi at full open it opens before. If I try to turn the star wheel in to get to the 25psi I run into coil bind. I know that it feels better than the stock spring.

One more question if you guys could. When I'm setting the AFC for full forward on the bench do I want it full forward and what my max boost is? Say I'm making 34psi out of my stock turbo what psi do I want the afc to be full forward at for a starting base line? I know there's tuning need.
 
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