Smoke

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Smoke

Postby Ptothej » Wed Jun 30, 2010 12:57 pm

Before I begin this is how the truck is sitting.. I have a 16cm2 housing, 3" down pipe, 4"exhaust firewall back, no muffler the smoke screw backed off till it hits that cap its under, I have the star wheel turned all the way to the top of the threads, BUT, the pump (full power screw, what have you) is turned in an un determined amount of times. So without screwing out that full power screw, is there a way of killing the smoke down low, example being taking off from a standstill, with a light to moderate acceleration without smoking? Theres not a mechanical issue, its all caused by my settings, I just want to be able to accelerate a bit harder then gramma without smoking, and smoke when I want to give 'er, everyones input is muchly appreciated! :)
'92 W250, 5spd, reg. cab, 2" lift, 4" dp, 4"exhaust no muffler, smoke screw bottomed out, star wheel bottomed out, full power screw maxed, BD fuel pin, BD 16cm housing (30psi), K&N air filter with a modified factory air box
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Re: Smoke

Postby Richie O » Wed Jun 30, 2010 3:28 pm

I am surprised you get smoke with the stock sticks. In my 93 with stockers and a maxed out pump I had 30 psi of boost and had very little smoke at the hit even with the smoke screw all the way in.
1989 W250 727, 3.07 L/S, S300, P/S Intercooler, Stans exaust, Pump adjustments, 127k miles,297 hp
1993 W250 extended cab, rag, 4.10 l/s, 6x16's, HTT 62/71/14 piston l/p, Isspro EV series tach, fuel pressure, boost, oil pres, water temp, volt, pryo, 132k/ 301 hp
1992 W250 with NV4500, 3.54's, 16cm 60mm GDS H1C, ground stock cone, Isspro tach, pryo, boost, fuel pressure, slow, rusty, dented,180k
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Re: Smoke

Postby Richie O » Wed Jun 30, 2010 3:31 pm

As far as fixing the issue go with a m+h # 2 fuel pin. It gives almost no fuel at low boost and gives around 5 psi more boost at full throttle. My 93 has 0 fuel down low even with the 6x.016's. I can stall the truck real easy taking off until the pin drops and when it does hang on. I actually need to turn the smoke screw in a little to get some fuel back on the low side.
1989 W250 727, 3.07 L/S, S300, P/S Intercooler, Stans exaust, Pump adjustments, 127k miles,297 hp
1993 W250 extended cab, rag, 4.10 l/s, 6x16's, HTT 62/71/14 piston l/p, Isspro EV series tach, fuel pressure, boost, oil pres, water temp, volt, pryo, 132k/ 301 hp
1992 W250 with NV4500, 3.54's, 16cm 60mm GDS H1C, ground stock cone, Isspro tach, pryo, boost, fuel pressure, slow, rusty, dented,180k
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Re: Smoke

Postby oldestof11 » Wed Jun 30, 2010 4:46 pm

Did you do these things to your truck or did you buy it like this?

2 things come to mind.

If you bought it like this, the AFC foot might be ground or out.

The other thing is a 14cm or 12cm exhaust housing to get it spooled quickly.
Jon
93 D250~ Mismatch of cheap parts, trying to look fast going slow
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Re: Smoke

Postby JBradley500 » Wed Jun 30, 2010 4:53 pm

my starwheel is up 4 full turns from the bottom. that was as far as it would go before the spring started binding. nothing to do with smoke, but you may be hurting top end performance with its current setting.


maybe you could look at your fuel screw and see if the collar is still on the threads. if the only thing on it is a jam nut then your fuel screw is probably in quite a way. you could do 2 things with it. if theres no collar, you can see how far it goes before it bottoms out (if it isnt already) and then get a recommendation on here about how far to turn it back. you also can just start turning it back 1 turn at a time from where it is now and see when it starts clearing up without having problems running properly.
92 W250- K&N Filter, Smoke Screw Adjusted, Synthetic Transmission Fluid.
340hp/662tq (8/24/12)
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Re: Smoke

Postby PToombs » Wed Jun 30, 2010 5:50 pm

You say the smoke screw hits the cap, you didn't take the cap off and throw it away? Do that, and pull the top of the AFC off, and back the smoke screw out until it's flush on the inside. Then you have no preload on the cone at all.
pete

Just enough power to break everything behind the crankshaft.
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Re: Smoke

Postby Ptothej » Thu Jul 01, 2010 12:34 pm

Thanks for all the input guys! Im sorry I forgot to put there that I do have the BD diesel fuel pin installed. Ive double checked.. the fuel pin is still going through all the motions, so top end is fine 28psi. Yes Ive done all of this to my truck, it didnt smoke even at full throttle when I first aquired it last fall, I would like to keep the power the way it is, so if theres nothing to adjust low end then I will deal with the smoke.. now PToombs with how I know my trucks set up, that sounds the best to me, I will take the cap off and get rid of the preload, because of course there is still preload as we speak with it in the position that I have it in. I would like to stay away from smaller turbo housings, because I want to be able to tow, and I dont want to send the egts thru the roof, plus Im done spending money on it for now. The m and h pin sounds awesome, maybe a bit extreme even hahah! I think adjusting that afc preload a bit more is going to be my ticket! Thanks everyone.
'92 W250, 5spd, reg. cab, 2" lift, 4" dp, 4"exhaust no muffler, smoke screw bottomed out, star wheel bottomed out, full power screw maxed, BD fuel pin, BD 16cm housing (30psi), K&N air filter with a modified factory air box
Ptothej
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Re: Smoke

Postby Ptothej » Thu Jul 01, 2010 1:34 pm

I assume with out that afc preload set screw, that there would be boost leak, so when I back this thing off some more I should make sure that thing is sealed up right?
'92 W250, 5spd, reg. cab, 2" lift, 4" dp, 4"exhaust no muffler, smoke screw bottomed out, star wheel bottomed out, full power screw maxed, BD fuel pin, BD 16cm housing (30psi), K&N air filter with a modified factory air box
Ptothej
fuel screw!!!!
 
Posts: 132
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Re: Smoke

Postby meby » Thu Jul 01, 2010 1:46 pm

My trucks always smoked more during hot weather than over winter. Now that were in hot weather...just a thought.
-1991 D-250 bone stock
-2000 Ford Windstar TDI Diesel 5 spd
-1997 Civic Hatchback
-Case 530 CK
-Old Huskee Garden Tractor w/Cub Cadet deck, Simplicity Snow-blower, loaded tires & chains - is it weird the tractor is modded more than my truck?
-Speedex Walking Tractor.
-BCS Walking Tractor


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Re: Smoke

Postby Ptothej » Thu Jul 01, 2010 2:15 pm

Less denser air in the summer for sure.. makes sense!
'92 W250, 5spd, reg. cab, 2" lift, 4" dp, 4"exhaust no muffler, smoke screw bottomed out, star wheel bottomed out, full power screw maxed, BD fuel pin, BD 16cm housing (30psi), K&N air filter with a modified factory air box
Ptothej
fuel screw!!!!
 
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Re: Smoke

Postby JBradley500 » Thu Jul 01, 2010 4:28 pm

Ptothej wrote:I assume with out that afc preload set screw, that there would be boost leak, so when I back this thing off some more I should make sure that thing is sealed up right?


nah dont worry. ive got mine way out (even machined the afc top hat so it will come out more) and it doesnt leak. theres a thread sealant on the bottom half of the set screw/smoke screw.
92 W250- K&N Filter, Smoke Screw Adjusted, Synthetic Transmission Fluid.
340hp/662tq (8/24/12)
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Re: Smoke

Postby Ptothej » Thu Jul 01, 2010 4:42 pm

I checked it out.. it doesnt even seem to be touching my diaphram.. so thats not an issue.. hmm, could just be the way things are.. unless I try to back the star wheel off some more?
'92 W250, 5spd, reg. cab, 2" lift, 4" dp, 4"exhaust no muffler, smoke screw bottomed out, star wheel bottomed out, full power screw maxed, BD fuel pin, BD 16cm housing (30psi), K&N air filter with a modified factory air box
Ptothej
fuel screw!!!!
 
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Re: Smoke

Postby BC.livewire » Thu Jul 01, 2010 5:49 pm

back the star wheel off would make more room for the afc spring thus add fuel ( as far as I know )

I use a digital caliper to make shor I'm move the star wheel the way I intended
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