Running an LB7 with 60 over extrude hones, s480, and some other custom intake parts and im trying to get rid of some of my smoke. This damn combo as it sits right now smokes teribly, and i dont mean just when i shit-can it, that i can deal with. I throw a constant trail of moderate smoke running 65 MPH up a slight hill with 7-10 PSIG of boost pressure. With the stock sticks i had no smoke save for full throttle, which was only a light brown haze. With these 60's anything over about 40% throttle makes more smoke than id like to see. If any of you fellas have some advice to point me in the right direction in the ways of timing, and pilot changes, id be much obliged! LOL!
LB7: De-smoking 60% over injectors
- Thread starter Mike_S
- Start date
If it was me I would shut pilot off after 18-2000 rpm
Then reduce pw in the 40-80 mm3 area
The adjust timing accordingly
Then reduce pw in the 40-80 mm3 area
The adjust timing accordingly
Yes but if you reduce pw then you should revisit timing
I pretty much don't worry about timing in lower areas as far as pw goes
I prefer to customize by sound and spool, but you get the point
I wouldn't hesitate to drop pw 30% but dropping in smaller inc might be best
I pretty much don't worry about timing in lower areas as far as pw goes
I prefer to customize by sound and spool, but you get the point
I wouldn't hesitate to drop pw 30% but dropping in smaller inc might be best
Guys, ive dropped pulse width in the base tune of my DSP2, and the only thing ive noticed different than the flip side is that it takes more peddal to get the truck moving, and because of the higher Average TPS it behaves like its in tow haul all the time. Keep in mind this is continuous moderate smoke at anything above about 40-50 MM3. I dont believe that reducing pulse width is the answer here.
Well mike is the tbiq stock?If not then reducing pw in Lower pw won't much matter... Right! No matter what you can fix this
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And king of all fuel, is base tq and tqliq
. And king of all fuel, is base tq and tqliq
Yes,throttle based injection quantity is stock save for the 90 and 100% rows. The more pulse width i pull from the main pulse table, the further i have to push the peddal to maintain the same speed, and the smoke at that speed stays the same. If i watch the scan tool, the pulse width to maintain say, 65 MPH pretty much stays constant. All reducing pulse width is doing is changing the throttle position relative to the pulse width required to maintain said speed. All i know is that it never smoked at cruise speeds with the stock injectors...starting to wonder.
You have to log it for it to all make sense. Concentrate on your problem area and start with tliq. If you reduce fuel there you won't get it! You can actually have high pw tables and control tliq ..... It takes time but it's the best way to tune IMHO
You are correct in this. It takes x amout of fuel to run your truck at any given speed. Look into the tables Simon ask. Did you raise rail pressure in the lower areas or leave them stock?
well if you werent running a s480 as a single you wouldnt be blowing smoke to just try an move....:rofl: j/k i pulled pw slightly and redid my tbi table little bits but were as my turbo lights so fast i didnt have to do much i gotta a table from a 60% over nozzle truck that i forgot i had maybe ill email it your way
THIS is where you start. This is the entry place for your shot. You are desribing lousy atomization, and this is where you have to fix that. Everything mentioned will yield foul results until you rewrite your fuel pressure algorithm.
Then you you have to adjust your pulse table down. This is no small project to do well.
Couldnt be the fact hes got too much fuel and not enough air at that specific throttle position/rpm could it?!?!
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It is possible but most likely its the tune. Mostly stock fuel pressures on a LB7 will make for a lazy and Smokey tune with the added fuel.
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Couldnt be the fact hes got too much fuel and not enough air at that specific throttle position/rpm could it?!?!
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