Minimizing smoke

[colectb]

Alright, I'll still do them to see what they do, but yeah, I just don't like the smoke, if i could get rid of it i would, and it would help get rid of the misconception that most people have that diesels pollute way more.

[8v-of-fury]

Well smoke them out, soot there windshields.. then tell them your car is still cleaner then there Hybrid

[stomperz71]

I agree with 8v-of-fury let it smoke! The more the better!

[Rabbit on Roids]

dyde, my audi smokes whenever i accelerate too. i think thats just the nature.

[colectb]

So thinking about that smoke screw then, that's for boost enrichment, is it not?  I pull about .5 bar or 7 PSI while cruising around 65 mph, (105 KPH). Now I know someone said earlier that turning that thing down is like putting a wood block under the gas (err... diesel) pedal, but would the lack of boost enrichment, like that of the eco diesel, cause a noticeable increase in fuel economy?

[burn_your_money]

would the lack of boost enrichment, like that of the eco diesel, cause a noticeable increase in fuel economy?

It depends on how you drive. If you never matt the pedal and hit the full load stop (I hope that's right, my brains broken at the moment) then it will make no difference. If your foot is always to the floor then removing the the LDA will limit the amount of fuel being injected while the turbo is producing boost. It's highly debated as to which will give you better fuel economy though

Freeing up your exhaust system will help reduce smoke because the turbo will be able to spool up faster.
Properly working injectors also make a big difference, especially in fuel economy.
An intercooler is definitely a good idea.

[colectb]

So will me boosting 7 psi constantly cause the LDA to be constantly injecting extra fuel?

[rabbitman]

So will me boosting 7 psi constantly cause the LDA to be constantly injecting extra fuel?

I don't think it will I'm not sure exactly when the LDA becomes affective but I think it's when your floored or nearly so. When you floor it the mechanism inside the IP hits a stop, but as boost rises the stop (which is hanging down from the LDA) is moved ahead with the mechanism still held against it by your foot, so more usable fuel is injected.

So if the adjustments are out of whack you might get too much fuel injected before you have enough boost to burn it all, so gray or black smoke.

I have studied an LDA but not in the car and I've never messed with one installed and tested each adjustment.

I've seen pics and explanations of what everything does on here, the search should turn up lots of usefull info.

[Smokey Eddy]

My smoking issues (in normal driving) went away entirely with blocking the waste gate and removing the BOV.

black smoke is simply unburnt diesel. 1600cc can only naturally aspirate so much O2 in there so off the line or at the start of a new gear you're always going to have some excess if you're leaning into the pedal unless you have the worlds smallest turbo that spools up on idle.

[rabbitman]

If I'm not mistaken,the LDA affects the fueling at all times other than idle.  

I have a hard time knowing exactly what the control mechanism is doing in there with the gov springs stretching and all.

Here's how I see it, with a NA IP there's a pin that stops the lever inside the pump, with a LDA IP there's the "movable finger" hanging down from the LDA that takes the place of the pin. So with the pedal not floored the lever is not against the pin on the NA or the "finger" on a TD.....I'm studying an LDA at the moment. To the naked eye it appears that the conical "boost pin" is evenly shaped all around yet off center, so turning it to the 'most fuel' position increases the fueling throughout the boost range when the pedal is floored, from pre-boost to full boost. I measured the LDA finger's travel at 1/32", as near as I could tell that remains constant however the conical pin is turned.

That being said, for the past two months I've been running a "modified" na pump with the stop pin removed and I haven't installed the LDA yet. The fuel limiting device is the "smoke screw" now rather than the stop pin also, the effects have been: the ability to make massive clouds of thick black smoke, or unscrew the "smoke screw" some and get a light haze of smoke.

I'm calling it a smoke screw simply because everyone will know what I'm talking about.....and I've forgotten the real name

Feel free to correct me on this.

[burn_your_money]

So will me boosting 7 psi constantly cause the LDA to be constantly injecting extra fuel?

Like rabbitman said.

Basically it gives you the potential to inject more fuel.