Need some help

[weaponoffreedom]

I am new to the tuning world and have a couple of vehicles. One of which I am trying to tune for max power, stock basically, 8mm wires,no bolt ons, 93 octane.

Would anyone be able to help me with this? I have followed the tuning guide, and have saved a tune, but want to double check my work before I upload it to the truck.

Vehicle is a 7.4 K2500 Suburban

I also have a 2004 k2500 Suburban with a stroked 6.0 to 6.6 and a magnussen supercharger, and a 2004 tahoe z71.

Just wanting to know if I am on the right track.

Thanks for your consideration

[horsepowerguru427]

Post the tune(s) and log(s)
We cant help with no info or data....

[weaponoffreedom]

Can you help me with how to do that? Please excuse my dumbass

[horsepowerguru427]

Absolutely, at the bottom of the screen in the reply box there is a button on the bottom right side that says "go advanced">Once the advanced screen is loaded, there is a button that looks like a paperclip that is for attatchments. Attatchment screen.jpg
Then select your tune file and your log file and load them.

[weaponoffreedom]

Absolutely, at the bottom of the screen in the reply box there is a button on the bottom right side that says "go advanced">Once the advanced screen is loaded, there is a button that looks like a paperclip that is for attatchments. Attatchment screen.jpg
Then select your tune file and your log file and load them.

I think I did it\ correctly, thanks and merry xmas

[horsepowerguru427]

So, "displacement change.hpt" is your 6.0>6.6 with a supercharger, yes? Has this been ran at all with this setup? What injectors (need injector part number) Just changing the injector flow rate does not compensate for new injectors. You need calibrated data for those specific (by part number) injectors. Do you have a wideband? Are you just trying to get this one to run or have you not even tried to start it yet? Cranking VE does not match VE table. Its still a stock OS which will need to be made into a 2 bar OS (or 3 bar if youre boosting that much). We'll need more details on this build.

"gold sub new book tune plus current plus 2psishift.hpt" is the 7.4 454 suburban thats all factory and youre wanting to just get "max effort" out of it, correct?

If you have the unaltered stock tunes, please post them so we can compare what you have changed and what is stock. I dont have those OS's on my computer and there arent any in the repository.

Just trying to get on the same page before we start making changes...

[weaponoffreedom]

"displacement change" is the 6.6. It does run and start nicely. Running smooth. I changed the displacement value, becuase on the original scan of the tune, it showed 6.0. I figured this would be in conflict, so I changed the value. I am running an AFR gauge on the dash. I did not do any of the work. It was done by previous owner at a reputable shop in NC. At commanded WOT, it runs 11.1 to 10.9 At normal driving, running from 14.5-15.1 sometimes at idle. Engine has 5000 miles since built.gold sub new ecm stock - Copy.hpt04 Silverado 6.0 4L80 P59 - 12585950_12578773.hpt

yes, the 7.4 is stock, running 8.5mm wires, stock ignition

[weaponoffreedom]

mot sure why the files posted there, but "gold sub new ecm stock copy" is the 7.4

and the other is a GMstock file for a like year silverado, i do not have the stock file for the 6.6.

Let me know if this is what you needed, thanks again, you have been very generous with your help.

[weaponoffreedom]

you still there @horsepowerguru427

[weaponoffreedom]

you still there @horsepowerguru427

still there?

[weaponoffreedom]

@horsepowerguru427

[edcmat-l1]

"displacement change" is the 6.6. It does run and start nicely. Running smooth. I changed the displacement value, becuase on the original scan of the tune, it showed 6.0. I figured this would be in conflict, so I changed the value. I am running an AFR gauge on the dash. I did not do any of the work. It was done by previous owner at a reputable shop in NC. At commanded WOT, it runs 11.1 to 10.9 At normal driving, running from 14.5-15.1 sometimes at idle. Engine has 5000 miles since built.gold sub new ecm stock - Copy.hpt04 Silverado 6.0 4L80 P59 - 12585950_12578773.hpt

yes, the 7.4 is stock, running 8.5mm wires, stock ignition

Unfortunately some of the "reputable" shouldn't be. The file they did is setup for a 2 bar MAP sensor (linear and offset) yet only uses a 1 bar VE table. That makes no sense. And they knocked a bunch of low load timing out of it. Again, makes no sense and is actually counterproductive.

It has 16 degrees of timing in it at higher load/WOT with no typical dip for max torque. Hopefully it doesn't make enough boost to hurt itself.

The only injector data changed is flow rate which means several other tables have to be wrong.

I stopped looking at that point.

[horsepowerguru427]

First, are you familiar with VE and MAF tuning? Im going to ignore the supercharged 6.6 right now. Lots of issues there. Lets start with just one file and vehicle and move from there, yeah?

Looking at "gold sub new book tune plus current plus 2psishift.hpt" tune, has anything been done to this that youre aware of? I dont have a stock file for this and there isnt one in the repository. Im going on the assumption that its stock. Timing seems a little high to me, but it is a BBC so theyll require some more timing for displacement.

Does this have stock catalytic converters or converters at all? If not you need to disable COT in the tune, as i did not. If you dont have them then leaving this enabled could throw off data integrity while logging.
What is the primary use of this vehicle? What are you looking for in TM settings? Im leaving it on for now unless theres an issue tuning with it on or you just want it gone. I did however remove brake torque management. I also didnt touch trans settings, again i dont know if these settings have been changed already. nothing to compare to.

I did fail the MAF and place it in OL with fuel trims. I changed a few things throughout the tune, including burst knock and changing PE to not kick in til much later. This means no WOT or any throttle past about 75% while logging data at the moment. We'll get to all that stuff later. Also, use smooth slow pedal transitions and try to spend at least a few seconds in each cell you can. You can also "2 foot it" and apply the brake as youre driving to reach other load cells...Be sure and give the vehicle several minutes of drive time after applying brakes to reach those cells in order for them to properly cool down.

If you would like to look at the other vehicle instead of this one first that is alright as well, i can go back and look through that tune and we can start there.

Take this tune i uploaded (making the changes i suggest about COT if necessary) and stick it in the PCM. Get your scanner set up accordingly. Id make a new histogram based on LTFT+STFT. So just clone a stock fuel trim graph and change the Parameter to user math LTFT+STFT.

If youre not familiar with VE tuning then you need to be reading up on that and anything else you can on the subject of air model tuning.

[weaponoffreedom]

@edc-mat-l1
Thanks, that is way over my head.

[weaponoffreedom]

@horsepowerguru427

thanks. the gold suburban is stock basically. Older Volant CAI, thicker ignition wires. The attached tune should be stock, which i included earlier. FYI. I am going out of town this week and will be back next week. I will study the differences and get back with you asap.

So what do you think I should do with the other one "6.6 Suburban". Is this to far out for me to handle with some direction.?