Gents,

We have an 07 Escalade ESV AWD with a L92 418, Ported heads, Gibson shorties, stock intake system, stock exhaust system. Comp VVt Cam 156-400-13 210/224 .556 .568. 114 LSA, Morel lifters, 11.2:1(chambers softened) Comp push rods, trunion upgrade, LS3 injectors.

I've tuned 100's of LT1 cars with datamaster and tuner cat, both SD and MAF tunes. Plus 100's of carb cars. the tuning parameters aren't a new concept and after driving it I can see where the changes need to be made, I just don't know where to go in HPtuners. I've read all the FAQ's, but they are two versions of software behind(and ten years old) what I have installed, and show tables that simply aren't in my file, at least that I can find.

Obviously this isn't a race car, but when it was first built with the truck injectors per the data it was turning all 4 tires on dry pavement. I did buy HP tuners basic and a mail order tune from PCM of NC. We made a couple pulls on the street with the initial tune and stock injectors(intention was to stay with the stock L92 injectors). Unfortunately we were out of injector at 5400, its supposed to shift at 6400. So we swapped in a set of new stock LS3 injectors and had them redo the tune. Since then it has just been far from right and obviously down on power. They have worked the tune 4 times, and it really has zero changes in drive-ability and performance. I give up, I guess that $200 went to money heaven.

So problems I have with the tune.

1. Idle hunt. I've read tons on this and how to fix it, but the tables referenced simply aren't in my tune, at least that I can find. AFR at idles starts nice and smooth, but after 20 seconds or so it starts chasing idle speed, and AFR bounces from high 12s-high 15's.

2. WOT fueling is all over the place. Commanded starts at 12.8, then drops to 11.8, the 10.8.....performance follows this trend. The actual AFR starts perfect at 12.6-12.8, then goes to high 13's, then heads down into the tens. Seriously I don't think I could get a carb to fuel this poorly.

3. Spark drops from 24-10 about the same time the WOT AFR starts going leans, shocker.... you can imgaine to what the power does at this point.

4. They told me this was a SD tune, but for the life of me I can't see how. Is SD even necessary at this level? Its just a little warmed over stock plus the cubes. Per fuel it was making over 540hp, we think it would be close to 600hp the way it rolling now(if we can get the tune fixed). No AWD dynos within a reasonable distance.


It seems I got the cool E38 with no VE table.

I've read about a "MAF disable" selection but I can't find that menu.

Where is the cam VVT table located? I have a sneaking suspicion that this is just zeros.

Any and all help would be appreciated. I am logging the Aem Wideband via AC pressure. Formula used is (2.375*[7101.10]+7.5125) This read right on with the gauge.

I have attached the tune and a log file. In the log you can see the acceleration in first gear level off as the AFR goes lean and it pulls all the timing out.

 

While there are guys on this forum that tune for a living you might get better response by asking this question on the HPtuners forum link below

https://www.hptuners.com/forum/

I'm paying for my tune and my guy had no issues loading the Texas Speed VVT tables. Make sure you have the correct MAF sensor and it is connected properly or the ECM may be going into default mode (Speed Density). After ensuring the correct MAF connection make sure you remove all power from ECM and start over. Although your engine is not E85 equipped I am still surprised you are running out of injector with minor mods. Hopefully you find some help from an experience tuner.

 

MAF is stock, hooked into factory harness. No mods to the MAF.

The stock truck injectors are pretty small if you don't have the flex fuel option. The LS3 injectors we have in it now should be plenty.

It's posted over on HP as well. Thanks.

 

Ok just a follow up incase someone needs it. I found that Hptuners doesnt show all the table you need when it opens up in default. You have to go to edit, view, and select advance. Then you will see all the tables you need. Why it isnt like this from the start is beyond me.

Found all kinds of fun things now. I'm going to try and re enable the MAF and play with that like we used to do with LT1's and see if I can't fix the fuel then go after the 95 spark tables hahaha

If anyone has some pointers I'd love to hear them. The E38 is certainly new territory for me.

BTW this engine sounds like a duramax in the mornings, and just found the Piston Slap table, and its extensively changed. I wonder if this doesn't have something to do with it. It didn't rattle this bad when new, but we knew with the piston we used noise was going to be a tad loud.

Heres the thread over at HPtuners if others want to follow along

https://www.hptuners.com/forum/showt...d=1#post476706

 

I'm glad you found the tables. Sounds like fun. Interesting...I didn't realize the tune had a piston slap table. Mine is a little noisy when cold but not bad. What parameters are changed to reduce piston slap? Thanks for sharing.

 

The piston slap table is just a spark timing table