VE help on LSA

I am having a hard time tuning VE on my 09 G8 GT with LSA installed. Running 80lb injectors, 450lph walbro, stage 1 blower cam, and pulleys. Everything else is stock. I am tuning with serial wideband with dfco, stft, and ltft disabled. It ran great when it was cam only but after the SC install it wants to die at idle and especially when i put it in gear. The histogram and wide-band say its about 10-20% lean but when I use light throttle to keep it running it swings to 10-20% rich. Am I missing something here? I already tuned MAF and it runs great that way but as soon as i fail it and force it into VE it runs like awfully. am I missing something here?

Does the blower have a bypass valve and is it operating?

Are you running just VE/SD or a blend of MAF vs Speed Density?

All injector data is correct?

Possibly need to tweak the idle airflow table for in gear, sometimes when you go into gear and the idle drops you will lose vacuum and drop into a low vacuum low rpm area which could be un-tuned, then once you touch the throttle the vacuum increases and will be in a different area of the map.

Do you have a log or map you can upload?

the bypass valve is working properly. I am using hptuners. I almost feel as though the converter is too tight. they are hptuners files so i dont know if you want me to email them to you but not sure how to post here since its not letting me. All injector data is correct as well. When it goes into gear the KPA increases not decreases

You should be able to click on the "Choose File" button below when you're typing a comment and upload a tune file or log.

I have tuned 100s of LS motors with cams or S/C with Hp Tuners and haven't seen this issue but happy to have a look for you.

This forum doesnt support hptuners files so i just zipped them

Have ad a quick look and can see what you mean when you put it into gear it wants to stall and goes lean. Can also see as I suspected your vacuum decreases (KPA increases since you're losing vacuum)

First off to stop the stalling I would look at increasing your percentage max from 1.9% to say around 3% to allow the E-Throttle more control to increase idle. Also increase your numbers around idle on your air flow max. If you can help the E-Throttle do its job to increase air flow when going into gear you won't lose as much vacuum. Basically allowing the ecu to effectively do what you're doing by applying throttle via your foot/pedal.

Secondly what happens if you just add more fuel into you VE map at 60kpa and 600-800 rpm where it is dropping down to and going lean?

I would say the main issue is not enough TP when going into gear and losing vacuum and going lean.

Interested to know why you decided to disable STFT?

When i add more fuel to ve i still get a large error. i delete stft in order to use a histogram to calculate fuel error via wideband. I guess it takes away the ecu influence to correct fueling so i can more accurately fueling to dial that in correctly. Should i re-enable it? if so how do you go about making corrections with it enabled? I will make those changes you suggested and go from there. thank you

What I generally do is keep the STFT enabled and I use a histogram for STFT error. Basically similar to what you have done but using stft instead of a wideband.

Then there is a good feature where you can "copy" you histogram from the scanner, go to your VE table in "Editor" and highlight your table, right click and select paste special. You can then paste your STFT histogram error into your VE table via a percentage and it makes the changes for you.

At the same time I have a wide band connected which I use for when in open loop.

do i add more throttle by increasing the "airflow final minimum"? I have added fuel and that doesnt change anything. I added timing to the high octane and it seems to catch the engine before it stalls. If i enable the MAF sensor I dont have this problem but when i try running speed density ONLY i have a very difficult time getting this vehicle to run correctly.

Yes if you increase the airflow final minimum it will increase air flow. Although only as far as the e-throttle will allow. The you need to increase your percentage max.

I personally haven't had this issue before when working with a correctly tuned VE table, unless the engine had a large cam and needs a bit of idle work.

Have you tried tuning blended between MAF and SD?