Eliminating low boost smoke

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Eliminating low boost smoke

Postby DodgeFreak » Mon May 23, 2016 4:53 pm

my crew smokes with no to low boost (10-15?? Psi) I have the power screw turning in roughly 2-3 turns I honestly can't remember but its not close to being bottomed. I have the smoke screw flush and the star wheel almost all the way to the top. I have an hx35 12cm housing. I'm thinking the only thing I can do at this point is to back the power screw off until it stops. Also I'm hazing at an idle so maybe the injectors need popped,cleaned, or replaced. It doesn't have a miss or anything to it. I will try to get the injectors popped and cleaned soon but wondering what else I could do. timing is stock.
92 D350 Cab and Chassis. Auto stock, wiring gremlins. 330k miles
92 W250 Ext cab rotted completely out. Auto, pump maxed, 215 ppump nozzles, Denny T2 pin.
85 D350 single wheel, converted to cummins, getrag, turned up 2 turns and afc screw flush.
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Re: Eliminating low boost smoke

Postby ellis93 » Tue May 24, 2016 4:17 am

I'd add some timing. At least the 1/8 bump,best bang for my buck (time spent) was advancing one tooth and parking the pump back at the factory pump marks.
93 D250 ,5 speed,4.11s,k&n autometer tach pyro trans boost guages,GDS 60mm h1c 14cm,honed 5x10,hplp/reg,1/8 timing,M+H M2 fuel pin, tims cooler tubz
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Re: Eliminating low boost smoke

Postby PToombs » Tue May 24, 2016 4:29 pm

I agree, bumping the timing should cut the smoke as more fuel will burn before the valves open.
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Just enough power to break everything behind the crankshaft.
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Re: Eliminating low boost smoke

Postby DodgeFreak » Tue May 24, 2016 8:24 pm

Bump to the head be enough? I really don't want to pull the timing cover any time soon lol
92 D350 Cab and Chassis. Auto stock, wiring gremlins. 330k miles
92 W250 Ext cab rotted completely out. Auto, pump maxed, 215 ppump nozzles, Denny T2 pin.
85 D350 single wheel, converted to cummins, getrag, turned up 2 turns and afc screw flush.
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Re: Eliminating low boost smoke

Postby PToombs » Wed May 25, 2016 4:39 pm

Most likely, but it may rattle that advanced. Plus it's a biotch to get at the inner hold down bolt and if you have to adjust the idle......... :roll:
I think go the 1/8th inch to start with, and then if you need more go a little at a time.
pete

Just enough power to break everything behind the crankshaft.
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Re: Eliminating low boost smoke

Postby ellis93 » Wed May 25, 2016 6:43 pm

Personally.......I'd take the time to jump the tooth,then retard the pump vs the marks by an 1/8 or so........but that's just me. Once you advance that timing you'll like it,and you'll want more.......least that's what happened to me. With a stick and some low gears,you can't beat some advanced timing
93 D250 ,5 speed,4.11s,k&n autometer tach pyro trans boost guages,GDS 60mm h1c 14cm,honed 5x10,hplp/reg,1/8 timing,M+H M2 fuel pin, tims cooler tubz
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Re: Eliminating low boost smoke

Postby cougar » Sat May 28, 2016 11:04 am

Now when you say " I have the smoke screw flush ", is that flush to the jam nut or flush to the top of the AFC cap?
RIP 91.5 W250 5 speed. The great experiment.
92 W250 HD 47RH with Compushift. Upgraded H1C to 62/60/16, Scheid Lightning VE, 60# valve springs, DAP 7X.010 injectors, 4" DE exhaust, home made cooler tubes.
01 2500 "the work truck".
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Re: Eliminating low boost smoke

Postby DodgeFreak » Mon May 30, 2016 6:35 am

Flush on the bottom (backed all the way out) the other thing I need to do is mill the bottom of it down also.
92 D350 Cab and Chassis. Auto stock, wiring gremlins. 330k miles
92 W250 Ext cab rotted completely out. Auto, pump maxed, 215 ppump nozzles, Denny T2 pin.
85 D350 single wheel, converted to cummins, getrag, turned up 2 turns and afc screw flush.
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Re: Eliminating low boost smoke

Postby DMan1198 » Mon May 30, 2016 9:55 am

I have mine milled down, screw flush with the bottom, and the stiffer afc spring from Eric, and the most I get is a fairly light haze until the primary kicks in which isn't too bad. I have to check again if I'm actually getting full fuel at full boost though.
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Re: Eliminating low boost smoke

Postby cougar » Mon May 30, 2016 12:06 pm

Instead of milling the cover, I made a spacer plate. Didn't do much good. What did the trick was changing the fuel pin to something more linear like the stock pin is.
RIP 91.5 W250 5 speed. The great experiment.
92 W250 HD 47RH with Compushift. Upgraded H1C to 62/60/16, Scheid Lightning VE, 60# valve springs, DAP 7X.010 injectors, 4" DE exhaust, home made cooler tubes.
01 2500 "the work truck".
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Re: Eliminating low boost smoke

Postby DodgeFreak » Mon Jun 20, 2016 10:55 pm

I'm running the stock pin turned to deepest setting. I went a head and popped off a set of stock injectors and set them up to roughly (with in 50 psi of each other) 248 bar which is 3600 psi, which is a little over 50 psi more. I haven't drove it yet but it did lower the idle. Once I drive it tomorrow in the day light I'll see if it hazes at an idle still and what the over all smoke is like. I should top off the tank and get a mileage reading also.
92 D350 Cab and Chassis. Auto stock, wiring gremlins. 330k miles
92 W250 Ext cab rotted completely out. Auto, pump maxed, 215 ppump nozzles, Denny T2 pin.
85 D350 single wheel, converted to cummins, getrag, turned up 2 turns and afc screw flush.
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Re: Eliminating low boost smoke

Postby DodgeFreak » Tue Jun 28, 2016 2:28 pm

Here is a video of what I'm dealing with. Its not horrible but I'm empty, running 55 and I run it up to 65. boost was around 5psi at 55 up to I think around 18-20.
https://youtu.be/jkTUor1vezk
92 D350 Cab and Chassis. Auto stock, wiring gremlins. 330k miles
92 W250 Ext cab rotted completely out. Auto, pump maxed, 215 ppump nozzles, Denny T2 pin.
85 D350 single wheel, converted to cummins, getrag, turned up 2 turns and afc screw flush.
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Re: Eliminating low boost smoke

Postby DodgeFreak » Tue Jun 28, 2016 2:50 pm

Also here is what is all done to it. fuel pin turned to deepest setting star wheel up as tight as it will go with full travel, afc bolt flush on the inside, pump turned up around 2-3 turns (I've lost count changing stuff), reset injectors to 3600psi spray looked good, timing bumped, hx35 with 12cm housing gate is hooked up but no boost to it. Flat footing it I see around 20-22 psi, I've had it up around 30 with a load climbing a hill. That's it as far as I can remember. Mileage is 20 empty and with a loaded trailer down the interstate was 12.5 and empty trailer down the interstate was 13.5

add more timing?? or turn it down?? I'm afraid to add to much timing but maybe i'll try it tonight with a little more timing and see how she does.
92 D350 Cab and Chassis. Auto stock, wiring gremlins. 330k miles
92 W250 Ext cab rotted completely out. Auto, pump maxed, 215 ppump nozzles, Denny T2 pin.
85 D350 single wheel, converted to cummins, getrag, turned up 2 turns and afc screw flush.
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Re: Eliminating low boost smoke

Postby thrashingcows » Tue Jun 28, 2016 4:16 pm

Maybe try the M&H timing spacer....I doubt if it has any affect on the low boost smoke and hazing at idle...but at mid to high RPM range/boost it will advance the timing at least the equivalent of the 1/8 IP bump.
1984/93 Dodge Crewcab, W350, 1 Ton SRW, long box, 330K Km's, M&H spacer, 366 spring, fuel pin to deep side, 14cm housing, Piston LP, PS IC, Isspro Boost, Pyro and tach, NV4500, 29 spline NP205, 3.54's.


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