lmm tuning

[smitty418]

Hi guys ! long time listener first time poster , so i come from the ls world. i have been self taught tuning since i was 17 im now 25 but ive always tuned gassers. turbos superchargers big n/a builds pretty much everything from mild to wild with the exception being nitrous stuff. anyways ive had 4 duramaxs and always paiad for tuning and decided with my newest truck i would give it a crack . so this isnt a final tune by anymeans but a roughed in one from the last week or so of logging and revising and i wanted to share it for a peer review / pointers. truck is a bone stock 07 lmm with 360k miles i got for crazy cheap. i dont have any specific goals for power in mind ,just great highway mileage and for it to not be a turd around town and whistle like a jet. anyways heres the tune !

lmm jim tuned 8.0 + trans.hpt

drive.google.com

 

[Lennydmaxguy]

Welcome. I'm kinda the opposite of you when it comes to tuning experience. I've done almost exclusively diesels, especially Duramax's.

The only thing you're really doing wrong is timing. It looks like you applied your gas tuning knowledge here, but on diesels, the highest timing numbers should be at high RPM / high fuel. Also, given that you're not really increasing fueling, you won't need big timing changes. A little added timing in the cruising range typically helps fuel mileage, but too much will make fuel knock. There are timing calculators on this site and other tuning forums to help get you in the ballpark of where you should be.

If you want to pick up more power, start by adding some fuel in the torque based fuel tables. I would add to the high end of the table and smooth in from there.

 

[2004LB7]

if you or anyone has the ability to upload the tune as an EfiLive file you'll likely get more views. plus you can upload it directly without having to use a link

 

[smitty418]

Welcome. I'm kinda the opposite of you when it comes to tuning experience. I've done almost exclusively diesels, especially Duramax's.

The only thing you're really doing wrong is timing. It looks like you applied your gas tuning knowledge here, but on diesels, the highest timing numbers should be at high RPM / high fuel. Also, given that you're not really increasing fueling, you won't need big timing changes. A little added timing in the cruising range typically helps fuel mileage, but too much will make fuel knock. There are timing calculators on this site and other tuning forums to help get you in the ballpark of where you should be.

If you want to pick up more power, start by adding some fuel in the torque based fuel tables. I would add to the high end of the table and smooth in from there.

Gotchya ! I just used a random timing Calc for lmm I had to handpick certain columns and rows since the units didn’t quite match up . Maybe that’s just an os thing but here’s what I put in for BTDC

And then today I did about 250 miles of highway averaging 22 mpg after I just slapped and smoothed an addition 3 degrees in the cruise area


Here’s my driver demand tables compared to stock . What cells specifically would you recommend I add to ? I didn’t wanna mess with my main fueling torque tables since I figured I could get the fuel through the driver demand . I’ll definitely start playing with that soon as I get an egt probe and a afr gauge . I know it’s not necessary but I would love to know whether or not I have too much air . I don’t wanna overwork the turbo if I don’t have to . Thanks again !!!! I appreciate the advice and pointers !


I should add that I’m at 700ft of elevation in northern Indiana so my tables I mess with are low alt hi and med alt

 

[2004LB7]

You can never really have too much air on a diesel. That is a gasser thing with the AFR. Diesels can run from anywhere from 80-1 down to 10-1 or so. Too little air is usually more harmful then "too much".

If you are concerned about the turbo, there is already a boost gauge and baro gauge. Use those to calculate the compression ratio and don't exceed the turbos specs

 

[2004LB7]

for altitude, your still in the low tables until about 1500 feet, then it starts transitioning over to the medium tables and is fully in medium at around 5500 feet. and its not fully into the high until your above 10k feet. 700 feet is still in the low altitude tables

what table is your 3rd screenshot?

 

[Lennydmaxguy]

I had somehow missed seeing that you had changed the driver demand table when I looked at the tune yesterday. What you did there looks fine, although I would also add to the higher RPMs myself.

Your cruise area timing looks about right, but I would still recommend adding more at the top end. It'll run a lot better that way. Maybe copy the stock values back and add a degree or 2 from 100 mm3 and up in the 3000 and higher RPMs.

You won't hurt your turbo with the boost numbers you're running. The thing to look for to know if you're asking for too much boost is the vane position the truck actually runs while driving. Typically, you don't want to see high numbers like 80s and 90s while driving under any conditions, and at WOT and high RPM, the numbers should be real low, like 20s, teens. But again, I don't think you'll have a problem.