Having trouble getting the vane position set with my new turbo

[GetBoosted]

Hello,

I have a 2006 Silverado w/ the LBZ duramax and recently installed a slightly larger turbo (went to a Danville Stage 2 GT3794va) and I'm having trouble dialing in the vane position so I can get the turbo to spool faster and rid myself of the P0299A (low boost) code I am getting. I've been working within the B2214, B2212, and B2210 tables and it seems that no matter what I put into these tables, the turbo is not honoring the requested vane position.

The only other part of the tune I have modified so far is to disable the EGR system.

My mods are:
* Danville GT3794va
* 3" MBRP downpipe
* 4" MBRP exhaust
* EGR block off plate

Am I missing something or is there something else I must do?

Thanks!

Chris






Also, the data log can be found at https://www.dropbox.com/s/6lp5gqer2vsp1sp/E35_0024.xlsx (wouldn't let me attach it to the post)

[Mitco39]

Have you looked at your Max position tables for the vane position?

[GetBoosted]

Have you looked at your Max position tables for the vane position?

I checked over the cold start but that's a good point since I didn't really check over the other tables. I've attached them for reference. My assumption was that since it's happening when I am warming up the truck that I should focus on the cold start for the max position but perhaps that's not an accurate assumption.

I'll have to go through these tables and set them higher to reflect the max position I currently have in the other tables. Is there any rule of thumb for setting the max on top of what I'd like the value to be?

[Boost]

LOL 299 has been kicking my ass for 2 weeks on some LMMs since the latest update (I am not blaming it!!!). I am about to start a thread on it.

[GetBoosted]

LOL 299 has been kicking my ass for 2 weeks on some LMMs since the latest update (I am not blaming it!!!). I am about to start a thread on it.

I hear ya. That other set of PIDs looks to be the ticket to why I wasn't able to get the vanes to stay closed longer. I took the tune back to square one and then applied some isolated changes to those tables (and I up'd some portions of the vane position maps by 15%) and while it still needs work, it certainly solves that issue. The boost is still laggy but I'm guessing I'm going to need to turn my attention to timing or something else at this point.

Thoughts? Should I continue fooling with vane position or should I retard timing before I hit boost to get the spool to improve?

[asmithIII]

Try letting PCM control vane position and boost

Turbo boost control fuel enable
Turbo boost control fuel disable

Once PCM has control, boost is matched to fuel flow using...

Main injection mixture limit

Enabled at rpm greater than 600

Hope this is helpful

[Mitco39]

This might sound weird but with P0299 try turning off the AC circuit DTC P0532/P0532 and see if your low boost goes away. You might be surprised

[GetBoosted]

Try letting PCM control vane position and boost

Turbo boost control fuel enable
Turbo boost control fuel disable

Once PCM has control, boost is matched to fuel flow using...

Main injection mixture limit

Enabled at rpm greater than 600

Hope this is helpful

Thanks for the insight. I totally missed those. I reverted all my changes except disabling the EGR stuff and applied changes to those tables (B2231 & B2232) and I've attached the results. Keep in mind this log was right after I wrote the tune to the truck so it's on a cold truck but that is typically when it's easiest to replicate the code coming up and I wanted to try it out so I was antsy :-).

Throughout the map there is normally around a 2 psi difference between desired boost & actual boost which is weird so I'm not sure why that's happening. Other than that, it looks like the requested boost starts to get away from the actual as I start to put my foot into it (around 3/4 of the way through the chart). The code didn't come back yet so I'm going to take another logging run in the morning to check again and actually let the truck warm up this time. Thanks again.

I'm thinking that I may need to combine this change with the update to the max vane position to help out the spool but I'll report back after I get to do more logs tomorrow.

This might sound weird but with P0299 try turning off the AC circuit DTC P0532/P0532 and see if your low boost goes away. You might be surprised

Thanks for the info. I haven't had to use the A/C lately since it's been awesome weather (70 degrees and sunny) but I can give that a look for sure.

[asmithIII]

Main injection mixture limit lets the PCM use MAF and fuel delivery to determine the correct boost.

Very useful, once enabled. Allows fine tuning of EGT.

[GetBoosted]

Main injection mixture limit lets the PCM use MAF and fuel delivery to determine the correct boost.

Very useful, once enabled. Allows fine tuning of EGT.

Are you thinking that I need to richen it up a bit to get the EGTs a little higher to get the turbo moving or are you thinking what I have now (stock) is fine for that?

Here's what my tables look like currently (NOTE: B0795 hasn't been modified but I wanted to give as a reference):




Also for reference, this is what B2231/32 looked like prior to me updating them:



Thanks again for the help!