dsp 5 tune

[dylon333]

hey guys just built this tune for my tuck. haven't run it yet was curious if anybody would take a look at it and see what they think? tow tune has turbo brake and couple others have high idle, and closed turbo at idle to help warm up. But let me know what you guys think?

[rfletes79]

Something isn't right in tune number 4 (dsp program 3), your Main Pulse is way off. There are a few other things that look funky as well, but that one looks like you may have pasted in a table from something else??

I would go back and look at every table to make sure that is what you intended it to be. I often find it helpful to go back after writing a new tune and rechecking every single to table to make sure I didn't accidentally do something I didn't mean to do.

[dylon333]

Thanks, I think what happened is I logged the truck and was coping stuff from the log and tried the copy and fill function but I guess that doesn't work like I had hoped. never tried it before, but am going back through them all again now. Thanks for the help

[dylon333]

went back through it and fixed a few things I noticed. need to just load it in the truck I guess and see what it does.

[monster50iii]

You're going to want to go through and message everything, even the correction tables. Not sure how you made your timing tables, but they arent very "smooth". If you used a calculator, could be your pulse vs rail pressure tables. Your tune #4 desired boost tables needs alot of work. Go into airflow and take note on what the truck declares is "low altitude", "med altitude" etc... For example on my truck 97kpa is true zero psi boost. DO NOT touch the torque base fuel tables, your trans wont appreciate that too much. If you want I could quick throw something together for a starting point for you.

[2004LB7]

Originally Posted by dylon333

went back through it and fixed a few things I noticed. need to just load it in the truck I guess and see what it does.

your PW tables could use some refinement and smoothing. something like what you did on DSP#4

your timing looks to be all over the place. not sure what you you are doing with DSP#1 {A9121}. with DSP#2 (economy)you are kind of on the right track. did you do any logging to see where your truck runs to know where to adjust the timing in the cruise areas? not sure why only 13ish degrees of timing in the DSP#3? are you trying to light the turbo? Smooth out those random peaks in the timing on DSP#4. did you try out the timing calculator?

fix your boost tables: In the DSP#2 (mileage) you can benefit from reduced boost in the cruise areas. make sure you calculate for the atmosphere pressure differences on your Low/Med/High tables. referencing table {B0202} low altitude is 13.9 PSI and up. 13.9 x 3 (pressure ratio ; choose your pressure ratio you want to use that is safe for your turbo, 3 is a good start) = 41.7 PSI. Low altitude is 8.5 PSI so 8.5 x3 maxes out at 25.5 PSI. do the same for medium. use this as a guide and build your tables from there.

Log your actual vane position under varied driving conditions doing a seperate log for each DSP tune. use these values and build a vane table out of it. for your turbo brake; run the vanes closed all the way out to 4800 RPM. if you were under hard grade braking and the rpms went over 2900 rpms (mine does often) you will lose your turbo brake. and, why are you closing off the vanes so much on your lower RPMs and all MM3 ranges? you may also be closing them too much in other areas. noticed that DSP#2 seems to be a little to tight and may choke off the turbo. if anything, for MPG you want to open them up

look over your fuel pressure tables again. looks like it is all over the place with no reason. DSP #3 maxed out at 149.5 Mpa for a race tune??? the idle and low rpm/fuel areas could all be the same. at your pulse width, you are likely not maxing out your CP3 so you might as well run it up to 180 Mpa.

you an also bump your RPM up a few revs and gain a little performance

my 2 cents. others will likely fill in with more details and explanations

[dylon333]

man this is great! I really appreciate you guys helping me out.

What I did on these tunes is logged the truck, then tried to recreate the tunes that are in the truck because I do like the way it runs but the guy I bought it from said it was tuned by a buddy and well I don't know him so I'm not going to just blindly run his tunes. especially when I have a v2 and want to learn.

I guess what I'm going to do is sit down tonight and do alittle more reading. I didn't realize the altitude tables mattered that much on the duramax, on the cummins ive always just copied the table for all the altitude options and it worked fine but guess cant do that with these trucks.

As far as the timing tables I'm not sure how they ended up so rough, but goes back to the coping of the log file I'm thinking I cant do it the way I was trying to do.

I don't think I messed with the vane position to much other then down around the idle position to help warm up, other then the mileage tune which I downloaded from the tune depot and just copied it all and pasted it all. I know in the description the builder said it was little out of the normal range on things but was working well for him and getting like 21 mpg! I'm getting 13.5 so I wanted to try his tune.

I'm coming from a cummins so still figuring out how high I can push everything and still make it safe. I like power, but I also want to keep the truck reliable and not worry about it.

But again I really appreciate all the help ive gotten from this site and few other duramax guys, the cummins world is completely different, you get shamed for asking questions about efi live, most guys wont even try to help, there are a few nice guys that did give me some advice when I got started with the cummins but nothing like the help ive gotten on this truck! Thank you!

[Dozerboy]

It sound like you logged someone's truck that had a tune and tried to "duplicate" it. That is very frowned apon and is stealing someone else's work. It doesn't really teach you how to tune. There several tunes posted here to get you started and tons of discussions on tuning. Between those and logging your truck to see what parts of the tables are being used during what driving conditions should get you started.



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[dylon333]

That's exactly what I did, but just trying to get a starting point, like I said it was just some hillbilly that tuned it for free so not like I'm stealing a big tuners tunes to try to sell. Maybe I over looked some tunes but I couldn't find hardly any tunes for lbz trucks. My idea on duplicating these tunes was so when I reflash the truck to my tunes I could have these tunes to fall back on if something failed or had some issues. but I'm starting to think that I'm causing myself more trouble then just starting with a clean base file and doing the foot work all over again like I did on the cummins, not saying I'm perfect there either but have a few trucks that run pretty decent so I got something figured out on those ha.

[PureHybrid]

There's a tow tune posted, and Dozerboy has a good mileage tune that I'm sure he's spent years tweaking. Those will for sure give you a good idea on where things need to be.

[2004LB7]

Originally Posted by dylon333

That's exactly what I did, but just trying to get a starting point, like I said it was just some hillbilly that tuned it for free so not like I'm stealing a big tuners tunes to try to sell. Maybe I over looked some tunes but I couldn't find hardly any tunes for lbz trucks. My idea on duplicating these tunes was so when I reflash the truck to my tunes I could have these tunes to fall back on if something failed or had some issues. but I'm starting to think that I'm causing myself more trouble then just starting with a clean base file and doing the foot work all over again like I did on the cummins, not saying I'm perfect there either but have a few trucks that run pretty decent so I got something figured out on those ha.

Well, as you say, if he is a "hillbilly" then I wouldn't use that tune as a starting point or even for logging for data. Who knows what he did and how he got there. Stock tune is the best place to start. Logging to gather information on the tables misses 90% of the tune. One pid might represent five tables. That is kind of doing it backwards.

As always advised here, start with stock then make small changes, log and see how it preforms. Rinse and repeat until you have what you want. Changing too many tables too much at a time will cause you to have a poorly running truck with issues that will be hard to track down. I probably have over a hundred revisions on my tune and it is just a single (non DSP) tune and many hours of logging. It runs good without any problems (keeping fingers crossed). It is basically what you are looking to do with your DSP tune all in one

I will see if I can play around with your tune a little bit tonight and smooth out fome of the tables and correct a few of the issues. Hopefully you study it and compare it to your current one.

[SickLL7Crenshaw]

Originally Posted by dylon333

That's exactly what I did, but just trying to get a starting point, like I said it was just some hillbilly that tuned it for free so not like I'm stealing a big tuners tunes to try to sell. Maybe I over looked some tunes but I couldn't find hardly any tunes for lbz trucks. My idea on duplicating these tunes was so when I reflash the truck to my tunes I could have these tunes to fall back on if something failed or had some issues. but I'm starting to think that I'm causing myself more trouble then just starting with a clean base file and doing the foot work all over again like I did on the cummins, not saying I'm perfect there either but have a few trucks that run pretty decent so I got something figured out on those ha.

Start with the non DSP5 stock tune. Make adjustments in small increments, log log and log, continue making small changes, log again, make sure you understand all tables and learn how they work themselves and with other tables. If you can’t figure it out over time, buy a tune from a reputable tuner. There is ALOT of time that goes into this.. Logging someone else’s tunes and trying to duplicate them isn’t going to work for you.

[SickLL7Crenshaw]

Originally Posted by 2004LB7

Well, as you say, if he is a "hillbilly" then I wouldn't use that tune as a starting point or even for logging for data.

So since someone is a hillbilly you automatically assume they don’t know anything?

[dylon333]

thanks for the advice I will start all over and do it the right way. you guys make some valid points. I spent so much time tuning the dodge, but that was 2 years ago got 5 good tunes built for it and pretty much forgot about efi. So now its starting all over trying to remember what I did and where. so I guess I was trying to cheat.

I know his tunes aren't great but truck does run decent on them that's why I was trying to save them. Nothing against hillbillies haha I live out in the sticks was just getting the point that it wasn't anyone who is someone. That makes sense right? haha

I found the tow tune and the milage tune. the mileage tune is the one that is copied straight from his tune and posted but I cant remember who posted it now.

ps still blown away at how helpful you all are being.

[2004LB7]

Originally Posted by SickLL7Crenshaw

So since someone is a hillbilly you automatically assume they don’t know anything?

From Merriam Webster: a person who lives in the country far away from cities and who is often regarded as someone who lacks education, who is stupid, etc.

Not trying to be an ass or anything, just if the OP found it pertinent to describe the previous tuner as such then it may have had bearing on his reasoning to start over making his own tune.