How to tune afc for mileage AND power? - Page 2 - Diesel Bombers



5.9L 12V Performance Discussion of 12 Valve 5.9 Liter Dodge Cummins Diesels with P7100 Injection Pumps Related to Performance and Longevity

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  #11  
Old 04-12-2010, 07:02 AM
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My buddy who's a beast at 12v's messed w/ the starwheel; not quite sure what he did with it. Are you saying move it all the way forward (towards the cab)? Will I loose power moving the afc back right now?
I bet he just loosene the starwheel so it would smoke on the low end. tighten it up a bit silde your housing all the way back and see how it feels. If you don't like it you can always put it right back where you had it.

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Originally Posted by lodal cummins View Post
when you grind the barrel are we grinding the front of the barrel( towards the front of the pump?)
Yes about .090 ... I'll get a pic up later
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Old 04-12-2010, 07:56 AM
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Originally Posted by lodal cummins View Post
when you grind the barrel are we grinding the front of the barrel( towards the front of the pump?)
Look at the 2 stickies on top of the section; one is called tuning the afc or something like that. There is a picture and it shows exactly which portion to grind

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Originally Posted by 94 12valve View Post
I bet he just loosene the starwheel so it would smoke on the low end. tighten it up a bit silde your housing all the way back and see how it feels. If you don't like it you can always put it right back where you had it.



Yes about .090 ... I'll get a pic up later
it does haze a bit putting around, and it smokes like a banshee until the turbo boosts when I floor it or if I lug it. So tighten the starwheel up towards the firewall?

Oh also I just remembered somethign; the guy that did my afc said he has it set to take off like a bat out of hell at 1700rpms. He asked what rpm I want it to really kick in at, and he said 1700 is a good rpm because that puts me abotu where the turbo starts boosting. Soooo whatever that means he did, you guys might know what he means.
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Old 04-12-2010, 09:11 AM
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with all that fuel on a stock turbo you should be boostin up before 1700?
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Old 04-12-2010, 10:16 AM
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yes tighten up the star wheel for now till you get that stiffer spring in it. twords the cab. your stock charger should light before 1700 rpms, your def putting the fire out.
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Old 04-12-2010, 11:49 AM
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Nope its a SLUG until about 1700rpms, then at 1700rpms it takes like a bat outta hell man.

But something interesting I JUST noticed. My bottom 2 afc screws are awol How the hell did those come out?? I notice smoke and oil and stuff blowing out, and when the motor is reved the whole afc moves . Sooo could that be the culprit for poor mileage too or no?
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Old 04-12-2010, 11:55 AM
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yeah it could
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Old 04-12-2010, 12:18 PM
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Originally Posted by 85_305 View Post
Nope its a SLUG until about 1700rpms, then at 1700rpms it takes like a bat outta hell man.

But something interesting I JUST noticed. My bottom 2 afc screws are awol How the hell did those come out?? I notice smoke and oil and stuff blowing out, and when the motor is reved the whole afc moves . Sooo could that be the culprit for poor mileage too or no?
do you mean it smokes like crazy and goes no where?
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Old 04-12-2010, 01:11 PM
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Ok long story. To answer your question, what I ORIGINALLY meant was when I was reving it under the hood it was smoking from the region of the afc.

But NOW my ******* turbo is fried AGAIN! I just replaced it a few days ago! Coming home from work I noticed it wasn't boosting anymore, gutless and rolling black smoke. Figured the afc was playing games.

I fixed the afc, now I test drove and same results. I'm soooo pissed I could torch this stupid piece of ****. Last time I test drove it I floored in first. No boost only sputtering about 2100+. Slammed the brakes and think I saw white smoke rolling past me. Turbo still spools (I can hear it) just doesn't boost.

I'm so fed up with this ******* thing. I bought it was a project (read: MODS, front cover fix, paint etc).. and this thing is only projecting my ******* bank account into the black
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  #19  
Old 04-12-2010, 02:09 PM
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Originally Posted by 85_305 View Post
Ok long story. To answer your question, what I ORIGINALLY meant was when I was reving it under the hood it was smoking from the region of the afc.

But NOW my ******* turbo is fried AGAIN! I just replaced it a few days ago! Coming home from work I noticed it wasn't boosting anymore, gutless and rolling black smoke. Figured the afc was playing games.

I fixed the afc, now I test drove and same results. I'm soooo pissed I could torch this stupid piece of ****. Last time I test drove it I floored in first. No boost only sputtering about 2100+. Slammed the brakes and think I saw white smoke rolling past me. Turbo still spools (I can hear it) just doesn't boost.

I'm so fed up with this ******* thing. I bought it was a project (read: MODS, front cover fix, paint etc).. and this thing is only projecting my ******* bank account into the black

wooooh clam down there bud its prob a simple fix, if you can hear the turbo spooling its prob a boost leak some where.
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Old 04-12-2010, 02:21 PM
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No I dont think its a boost leak. It came on the same way my last one blew a few days ago. Was cruising, all of a sudden right before I shifted (around 2k) it started sputtering, throwing smoke and being gutless. Only this time I dont hear the impeller clanging around. But i"m pretty sure its busted. There isn't anything thats been done that would cause a boost leak.
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