low boost excessive smoke - 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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Old 10-27-2009, 09:57 PM
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Default low boost excessive smoke

"hi guys, ive got a 97 12 valve with #100 fuel plate, 4" exhaust, 16.5 timing, boost elbow, southbend dual disk, and complete guages. the truck makes good power and about 38 psi boost under full throttle. i would like to lower the smoke level under low boost conditions. would a afc spring kit help quite a bit? also i am looking at
the 3k spring kit to free up a few more rpms. any negative driving charastics with them? also with your experience what would be a good injector/ turbo combo to make 500 drivable horsepower. thats my ultimate goal. thanks
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Old 10-27-2009, 10:33 PM
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where's your star wheel at?if it's all the way foreward it will smoke alot under low boost conditions.
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Old 10-28-2009, 09:10 AM
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havent messed with the star wheel at all. im assuming that tighter lowers the fuel level at low boost?
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Old 10-28-2009, 09:59 AM
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correct if remember correctly toward the motor gives u more fuel.. i would slide the afc back a little.. it cleared up the exhaust on mine for my e-check.. i have a 100plate also, slid the afc back all the way and the plate slightly and i passed!!!! thank god the guy thought my muffler was a cat conveter!!!
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Old 10-28-2009, 10:17 AM
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toward the front of the truck,more fuel.try backing it off a little,you are not lowering the amount of fuel you're getting you're just not dumping so much at low boost.
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Old 10-28-2009, 12:28 PM
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yes. the plate is at full forward. the exhaust cleans up when boost pressure comes on.

---AutoMerged DoublePost---

ive been thinking of doing an injector upgrade. should i put in a less agressive fuel plate with a larger injector? was thinking a 75 horsepower dd injector. i know im going to need a turbo upgrade. the truck has 294,000 miles and im sure the factory injectors arn't quite up to par.

Last edited by kruegs28; 10-28-2009 at 12:28 PM. Reason: Automerged Doublepost
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Old 10-28-2009, 02:57 PM
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what kind of plate is it?if you will adjust that star wheel back it will make a big difference in the smoke pre-boost.
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