LBZ: Fell off the bandwagon

[ippielb]

I tuned my truck a long time ago. It's alright, but i don't like it anymore. Want to re-do my tuning conservatively. I have been searching for a long time now for a tuning tutorial for the LBZ like McRat's 20/20 for the LLY and LB7 but have come up short. Although i did come up on one thread where a guy got banned twice which was entertaining in itself. But to cut the thread short, i'm looking to learn how to tune my truck again. I've honestly forgot everything i knew, may it be not much, i still forgot it.

Here's what my truck has all done to it.
afe cold air intake,
snow performance methanol injection,
Fass 150gph titanium,
PPE Race valve and bored fuel rail fitting,
BD driver side manifold,
afe 3" ceramic downpipe,
4" straight pipe,
NADP Race transmission napc transfer case,
cognito traction bars,
yukon grizzly locker

I also have a high flow y bridge to be put on but haven't gotten around to it(shop is full of snowmobiles at the moment)

Anyways i have found this thread, http://www.dieselplace.com/forum/3-...efilive-tunning-quick-tutorial-how-works.html it explains what each table does and how it effects it. But not what do to with this newly acquired knowledge.

From what i have gathered using the pedal position desired torque (b1115) and increasing the whole table by a 25% will be an easy way to get a 20hp tune, without having to change fuel/boost/timing tables. But i want to try more. I don't want to change my tunes that i have made in the past. I want to start fresh.

I am on night shift so any comments would be appreciated i will get back to you guys as soon as i can.

 

[cdbright]

who did your first set of tunes?

 

[ippielb]

I made them myself, one tune at a time, but then put them into a DSP5 operating system. They are nothing special at all, mainly just little changes between the tunes themselves. To most it wouldn't justify having a new tune. The main reason why i want to start fresh.

 

[ty_LBZ]

Its like cutting your hair yourself vs. having a Barber cut your hair. Experience is everything! Do yourself a favor and get some tuning from one of the vendors on here:thumb:

 

[Dmax87]

" Do yourself a favor and get some tuning from one of the vendors on here". Good info right there, glad none of the big name guys lived by this type of thinking. I tune my lb7, and I love every minute of it, I've worked on my tunes off and on for about a year now and still don't have it perfect. That being said I've yet to tune an lbz but in theory you do the same thing as I did with my lb7, your ECM just has a lot more parameters, things are worded differently, oh and you can crack a piston in yours haha. Biggest things that make power are fuel pressure, pulse width and timing. And of course on yours you can play with boost. Do some research and see what yah come up with. I learned most of what I know from the forums since there's big money in tuning most guys wont help yah. Hope that helps yah a little, also there's always starlite diesel efi classes.

 

[DMAXchris]

A timing calculator can help a lot.
http://www.duramaxdiesels.com/forum/showthread.php?t=15659&highlight=timing+calculator

 

[THEFERMANATOR]

The biggest thing to wrap your head around with tuning an LBZ/LMM VS LB7/LLY, is that everything in the BOSCH ECM is based off of a torque value. The BOSCH ECM does everything in a theoretical torque figure. When you push the throttle down, the ECM references RPM's VS applied amount of pedal, and comes up with a desired torque value. It then uses that torque value and references another table to determine how much fuel to give it based off of RPM's and the torque value. It's simliar to DELPHI tuning, but DELPHI calls for a fuel amount whereas the BOSCH ECM has the extra step of figuring a torque then torque to fuel. That's the short of it from what little I have learned about them. Then of course you also have boost figured into the equation. I myself like tuning my LB7 because it is just so friggen simple. I tell it to fue lX amount, and that is what it does so long as I am not calling for more than what a limiter will allow. LLY's are just a nightmare(at least for me anyways) to flash, LBZ really isn't that bad once you wrap your head around the extra step, and LMM's are just a pain with all of the limiters and modifiers, as well as not wanting to do what you tell it to and then having to find the modifier or limiter to make it do it.

 

[ty_LBZ]

" Do yourself a favor and get some tuning from one of the vendors on here". Good info right there, glad none of the big name guys lived by this type of thinking. I tune my lb7, and I love every minute of it, I've worked on my tunes off and on for about a year now and still don't have it perfect. That being said I've yet to tune an lbz but in theory you do the same thing as I did with my lb7, your ECM just has a lot more parameters, things are worded differently, oh and you can crack a piston in yours haha. Biggest things that make power are fuel pressure, pulse width and timing. And of course on yours you can play with boost. Do some research and see what yah come up with. I learned most of what I know from the forums since there's big money in tuning most guys wont help yah. Hope that helps yah a little, also there's always starlite diesel efi classes.

Taking classes would be good, but going to a forum to learn how to tune a $15k truck, where everybody is an expert in their own mind is another thing. I'm not saying not to do it. I paid for my tunes because I don't have the experience or time to learn EFI tuning. To each his own...

 

[ippielb]

Funny I do cut my own hair. Looks just fine :joker:

I have all the timing calculator, scripts to populate the dsp tables.

I just don't know what to log and to look for to know what to change and how much and why. I know little steps like I did before but timing is what scares me the most.

I used the timing calculator and I had some injector knock so I just went back to stock timing. Which I wish I knew why. Timing is propably the best for fuel mileage.