Help: No smoke? no fun

[LBZrcks]

Never had to adjust MAF tables to make smoke

I need to log it and see if fuel is actually being limited

increase in PW should make it smoke no matter what the turbo timing and all other tables are. if it just adds more power then your not adding enough its that simple unless a table limits it or you cant supply it
at low RPM and pressure there should be no reason to not supply it

Im really wondering if some of the tables dont work as others have posted? Yet why would one truck smoke and another not?

I never touched the table that DA adjusted and the tune is very similar to yours Jason.........I did go a lil overboard on the PW but cut it back after seeing all the smoke now it just puffs a little right before the the turbo lights

I can up the PW to make it smoke but it doesn't smoke as much as my LBZ did and it generaly clears up fast how I like it to

 

[vortecfcar]

I asked Ross to bring those tables up after seeing HPT had them and EFIlive did not...back a few months ago.

He said the lambda tables were not functional, but I never bothered to try. Sounds like they are after all.

Nick

 

[LarryJewell]

Never had to adjust MAF tables to make smoke

I need to log it and see if fuel is actually being limited

increase in PW should make it smoke no matter what the turbo timing and all other tables are. if it just adds more power then your not adding enough its that simple unless a table limits it or you cant supply it
at low RPM and pressure there should be no reason to not supply it

Im really wondering if some of the tables dont work as others have posted? Yet why would one truck smoke and another not?

I never touched the table that DA adjusted and the tune is very similar to yours Jason.........I did go a lil overboard on the PW but cut it back after seeing all the smoke now it just puffs a little right before the the turbo lights

I'm running significantly less PW these days compared to times past and I still can embarrass the local fords and dodges rolling smoke

 

[othrgrl]

I was giving it alot of fuel and it gave it a puff. Then lowering boost and vane position but still couldn't get the smoke to keep rolling. He said it would let out a cloud then clean up and have lots of power. It wasn't until I played with the lambda table that he said it would roll continuous smoke like he wanted. I tried to tell him that the smoke would get old quick and he'd be wanting something different but he still wanted it.

I don't like smoke and have our LLY and LBZ both tuned to clean up almost completely. The only time they roll thick smoke is if you purposely put it on the floor without the turbo spooled - then it will puff a quick cloud then clear up quickly.

 

[JoshH]

personally i dont like smoke and strive for a haze but lots of my friends crave the coal

I don't even want my truck to haze.

 

[LBZrcks]

Any new ideas on this?

Here are my ideas:
{B0794} Main Injection Rich Mixture Limit - pretty self explanatory why it would matter
{B0795} Main Injection Mixture Limit - again self explanatory and lambda lower than 1 is considered rich so lowering this limit should allow a richer fuel mixture and more smoke

I'm testing these both out right now and will let you guys know.

Well verdict is in and these 2 tables did the trick. I set the first one to .5 and the second to .75
After that you can make a smoke tune for an LMM the same way you would for the other VVT trucks. And fooling the MAF isn't even neccesary. Just add fuel and take away some boost and vane position and it'll smoke like a real diesel.

What about this table?

{B0797} Main Injection Mixture Limit RPM

Fuel mixture limitation will only be applied once RPM is above this value.

Mine is set to 6000 RPMs

Looks like it is already disabled

 

[McRat]

So far, based on my dyno testing, max power is achieved with just a gray haze.

I'll admit, I'm not an advocate of big smoke and worked to try and reduce smoke without hurting performance. Sometimes I get it right, sometimes I don't.

In the long run, smoke is going to be the death of the diesel performance industry. While smoke is not that harmful, it's perceived that way. Gasser emissions are more deadly, but at least they are invisible.

It's not a popular opinion in the diesel community, especially on the Dodge boards, where folk ridicule efforts at promoting "clean" HP. But more and more serious hotrodders are coming around. Oddly enough, Gale Banks promoting clean diesel power backfired to a minor extent, since there is a large faction that will automatically say anything Gale says is wrong.

I'm not trying to kill your fun (well, maybe ), I'm just concerned about the future.

 

[othrgrl]

B0797 was set at 6000 in his tune as well but changing the lambda tables fixed it.

 

[LarryJewell]

what is the lambda table

 

[mytmousemalibu]

what is the lambda table

Well Lambda is your Air/fuel ratio, just another word for it. Unless im missing somthing, the new trucks dont have O2 sensors do they? Less its for DPF purpouses?

On another note: I had seen that Innovate Motorsports now has a Wideband O2 setup for diesels, this might be a handy piece of equipment

 

[vortecfcar]

You can calculate a predicted Lamba off the mass air sensor and fuel rate.

I think that table with the Rev limit may be backwards. There's no reason to limit smoke over 'X' rpm. It seems more reasonable to limit lambda under 'X' RPM.

Who knows, need to verify the logs to see if it's for real.

Nick

 

[othrgrl]

B0794 and B0795 are the air-fuel mixture tables where lambda is the unit of measure. I agree with Nick that EFI must have the description of B0797 backwards - there is no reason for GM to limit the fuel mixture above an RPM - below a certain RPM makes sense. I also believe that the fuel mixtures are calculated and not measured by any sensors in the exhaust.

In theory:
On any of the older trucks when you get into it before the turbo spools it gives it whatever amount of fuel the Throttle Based Injection/Torque Based Injection tables demand (which then reference pressure and PW tables). On the LMM the computer monitors the air measured by the MAF and limits the fuel mixture based on that - so you don't get full fuel until you are getting the air to support it. I haven't verified this in logs yet but this appears to be the way it was working.