Calc. VE Tuning - Newbie getting started

[blsnelling]

Thanks! That's real good to hear!

I replaced "displacement()" with "5.964". Here's my latest log. It has several WOT runs in it. Log_0004.efi

Here's my tun file after the latest changes. My Modified_02.tun

[blsnelling]

Here's my setup.

'01 GMC Sierra ECSB 4x4, '04 6.0L LQ4 Shortblock, 243 Heads Milled .035 11:1 Compression, Mild Hand P&P, Pac 1218 Springs, Yank PT3200 Stall, Comp Cam 220/224, .581/.581, 112+0 LSA, LS7 Lifters, Melling HP Oil Pump, TBSS Intake Manifold, Edelbrock 3864 90mm T-Body, Doug Thorley LT Tri-Y ceramic headers, Flowmaster 50 SUV, LS1 e-fans, Airaid MIT, Complete valve body build up, 4.30:1 + Detroit TrueTrac, 33/12.50-17 Tires.

[WeathermanShawn]

Wow, nice mods!

Well as far as Closed-Loop Tuning, looks like you are done. Your LTFTBENS are spot on and your VE Table looks pretty reasonable. Your Injector/Fuel Delivery set-up is obviously different..I am so used to looking at LS1's.

Had you never really tuned the MAF before? I mean those numbers are as close to perfect as you can get..

Just a little KR at WOT..Looked like it did pull your Spark down though.

Overall, I would say good job..

[blsnelling]

Wasn't expecting a response like that, lol. I adjusted the MAF a little, using the log I just posted. What you see in the .tun has not been logged yet. They were all very small adjustments though, like .98. I've modified the VE table quite a lot. Since it's hard to hit all the cells, I've blended it quite a lot by hand. I've only gone over it twice so far. The first time through, I did a lot more blending.

Like I mentioned earlier, this was a mail order tune from a reputable source. I've changed quite a lot in it though. So if you see something out of wack, blame me

Did I read that I don't need to do the Calc. VE tune much over 4000 RPMs?

[WeathermanShawn]

I still try to tune above 4000 Rpm's on the VE Table for one reason..if you get a MAF failure it will use those numbers exclusively. I don't go nuts though trying to tune every cell above 4000 RPm's, but I like to get the high kPa areas as solid as possible.

Good luck..

[blsnelling]

The way I understand it, the PCM goes into PE mode above a certain level, and no longer uses the VE table. Do I need to up the values in B3618 to tune more of the VE table? What about the values I'm getting in those higher cells now? But If I'm going into PE mode now at higher output, what about the values I'm getting for my VE now? Help me understand this transition.

[Boost]

You can use my calc_pids file above.

I'm wondering if I'm getting all 0.00 in my VE_Talbe map because it can't find the displacement. I just replaced that with 5.964, and will see what happens.

Working so far, thanks!

[Boost]

Ok, on page 3 of the tutorial, there is a list of PIDs to select. Then on page 4 it says it should look like another list with several more different PIDs?? Not a big deal but it won't work without a full list right? And without a WB, no point in selecting those channels right? Thanks!

[WeathermanShawn]

The way I understand it, the PCM goes into PE mode above a certain level, and no longer uses the VE table.

Its not quite that simple. It utilizes a blend/correction until you reach the level determined by B0120. Above that RPM Threshold it is all MAF. PE mode is adding a fueling multiplier (EQ) based on TPS & RPM. Normally that corresponds to MAF/VE Airflow. The total discussion could fill a textbook. The CALC VE Table is one of the few formulas that actually equates MAF Airflow to VE Airflow.

Do I need to up the values in B3618 to tune more of the VE table?

No. Stick with the EQ you need for fueling. Normally that is ~1.156 EQ..

What about the values I'm getting in those higher cells now?

Not sure what you are asking here..

But If I'm going into PE mode now at higher output, what about the values I'm getting for my VE now?

The Airflow is determined by the MAF, IAT, ECT, LTFTBEN. The PE is simply a fueling multiplier. That involves a lengthy discussion of Injector flow, etc..Airmass is just one little part of that equation.

Help me understand this transition.

If you have a good understanding of math, sometimes it is just best to study the equations for a few hours a day. If you do not have the math knack, lots of logging and making tune changes is the only other way to learn.

Hope that helps..

[WeathermanShawn]

Ok, on page 3 of the tutorial, there is a list of PIDs to select. Then on page 4 it says it should look like another list with several more different PIDs?? Not a big deal but it won't work without a full list right? And without a WB, no point in selecting those channels right? Thanks!

Boost:

Looks like page 4 is not correct. We missed this on our final publication. The Pids on Page 3 will get the job done. Looks like the example on page 4 has additional PIDs that are not really required.

Thanks for pointing it out. We are going to publish a post-production Tutorial Update at some point. We have most of the other errors logged and will get them in our next update.

You can still accomplish a lot utilizing just the narrowbands. Obviously, once you hit PE Mode there is no narrowband feedback so there is where the wideband is mandatory. The CALC.VE Table formula will still 'work' it will just lock in your last LTFTBEN. You will get an airflow value, just no guarantee of the proper AFR/EQ.

Thanks again..