Modifying my AFC
 

I am modifying and tuning my AFC, is it okay to run an aftermarket fuel plate or should I run the stock fuel plate with an AFC tuning? I have a #11 plate in it already but still have my stock one on hand. Thanks!

its fine to run aftermarket plates...as long as you keep an eye on things like egts and your tranny can hold up to that and the rest of the performance enhancing stuff

u can do anything u want as long as u got the air to back it up and better airflow out (exhaust) always helps.

Well I got it all back together, it seems that with my #11 plate in the stock position, I'm not getting much more out of it, even WITH the modified AFC. Move the plate forward?

the real question here is why NOT? lol just be careful, don't go breaking nothing and watch your gauges and go for it.

Nice way to look at it:tu: I did read somewhere that not moving the fuel plate makes tuning the afc pointless, I want to know that it is fact before I take it all apart again to move the plate

That is far from fact.

Well I have the afc all modified and seems like no matter what adjustments I make the truck runs the same

what exactly do you mean by modified (be specific with what you did) and that will allow some more knswledgable guys to further assist you. from my experience just moving the stock plate forward should result in a different feeling in the butt dyno

I turned the cup washers into flat, I shaved off just under 1/8" on the foot, and adjusted the smoke screw to where it just touches the diaphragm shaft. The truck ran good but wouldn't smoke and had turbo lag, couldn't even get 20psi until after 2000rpm. I slowly adjusted the smoke screw and after a couple hours I noticed that the truck is still doing the same, no smoke with turbo lag

have you tried moving the housing itself forward yet?

yeah I've tried it forward and in the middle, maybe just keep turning in the smoke screw?

It seems to me that you need to move your plate. A lot of AFC mods don't really do anything if the plate is still in the stock location.

Dude just put the damn plate all the way forward and be done with it (and dont fry your auto/clutch)

The AFC controls the rate at which fuel is delivered, lowering spring pressure will bring the fuel in earlier, as will inceasing the starting position of the off idle adjustment(smoke screw). If you are not altering the rack stop(plate), you will not increase hp or delivered fuel quantity.

Have you messed with the star wheel at all? or is that what you referring as the smoke screw?
Attachment 44360
Just remove the plate completely once and see how you like it. But keep a eye on the egts if you on the go pedal

Okay I moved the #11 plate all forward. I adjusted the smoke screw to where I'm getting just a haze of smoke until about 6-7 psi.
I adjusted the star wheel as far out as I could and still cannot get even a haze of smoke after 6psi. My boost seems to start slowly climbing at 1500rpm and finally hits 30psi(which is where I set it) at about 2300 rpm. Everything sound right or no?

Seems like your boost is coming in high? It's been a minute since i've had my cummins, but I thought that boost came in hard right around 21-2200 rpms?

Turn star wheel all the way in towards the front of the motor and start to turn it back towards the cab till its where you like it.

i didnt cut my foot i cut the barrel. anyways where did u move your starwheel too? did u adjust ur plate forward? afc ff?

My starwheel is all the way forward, my afc is ff as well, and so is the fuel plate, so pretty much everything is full forward and I'm losing my smoke after 6psi

Your losing fuel pressure.

x2 on fuel pressure theres no way u shouldnt see big results with the right plate and everything forward.

When was your last fuel filter change? Did you clean the strainer? Simple places to start. :pca1:

ALRIGHT I took the plate out now to see if I got more of a gain, trying to eliminate what could be wrong.
I am burning coal now under 6 psi(I'm going to adjust that smoke screw more now), my boost is way better now. Instead of hitting 30psi at 2300rpm, I was passing 30psi going to 40psi at 2000rpm, I had to let off the throttle obviously as I saw the gauge still climbing.
I'm going to make a boost controller tonight to hold my boost at 33ish.
Since the truck performed way better with the plate out compared to with the #11 ff, does that eliminate the fuel pressure possibility?
My fuel filter is new along with a new lifter pump

Imho, your fuel pressure is fine. I would still clean the prefilter screen or get a new one from cummins for like $8, dont go to dodge and get one, I think they want around $44 for one. Just keep a eye on the egts. The first time I pulled the plate I had stock sticks and stock timing and hit 1400* pretty easy.

You have revealed the issue, now to see how many people can tell you the cause.

Surprisingly I still only got my egt's up to 1000, maybe because I was letting off the throttle once it tried going beyond 30psi

Dude dont use a boost controller just get a damn boost elbow for $5

u dont have to be a dick to him every reply u said u said it like he should have aready known to do it or he was stupid for not. im sure u were dumb at a point and timeand wanna learn somethin not sayin jayco is dumb but was wantin to learn about stuff. im not bein a dick but just read or think about not wat u say but about how u say it to somebody. have a good day!

This is true I do tend to come off as an a$$h0le. Not my intentions. I apologize.

My wife always tells me I need to work on my interpersonal skills... I wonder why :humm:

Boost elbow for $5?? From where??

Meh $14
adjustable turbocharger boost elbow fitting cummins - eBay (item 190469084281 end time Nov-20-10 18:18:09 PST)

I bought a fuel plate AND boost elbow or 30$ shipped

its all good

Governor arm stuck under the fuel plate.

I am MAKING a boost elbow/controller out of brass fittings, with an adjustable t-fitting

Winner winner.

Yay! What do I win? :tttt::c:

A truck that runs properly! hehe

Always wanted one of those. :tttt: