2013 CTS-V VVE Tuning

[1qwkss]

hey guys...i've got a 13 V2 Sedan with an airaid and headers. A few years ago i purchased the EWM tuning techniques and have been utilizing them to attempt to scale my MAF and modify my VVE. I've got my file setup for Open Loop, No MAF, No LTFT/STFT and the data is polling as it should. However, I'm noticing that even though the data is accurate and is stating to pull fuel out in the idle zones when i write the file and prior to start i reset LTFT just to ensure clear data reception but when i start the car the wideband yeilds richer results not leaner. i've managed to make it function by physically taking the data and going back and forth and multiplying by the given data in the scanner but i should be able to just copy and paste special/multiply%. i've also noticed that the "air-fuel ratio commanded" channel is yeilding 13.02 at the moment whereas earlier when i was logging it had been 14.08. Stoich is still in the stock 14.68.....etc table form.

tune and most recent log attached

any/all help is appreciated....i've not touched the MAF yet because everytime i try to do the same method of copy/paste it seems to again do the opposite....my guess is i missed a table or something somewhere in the setup of each of the files i built for the two different modification attempts but idk.

EDIT: only modfications are Airaid Intake, ARH 2" HEADERS (long system), & i've installed my flex sensor but it's just turned on with no tables populated yet for functionality

BACK FROM 711 USE THIS DATA.hpl
LAST ATTEMPT.hpt

[Guy With A Chevy]

Can you post the tune attempt before that change. Its a rather short drive you need more a higher poll count than that to be accurate.

Your EQ is all over the place not sure what you mean by pull fuel out at idle if you mean 6-700 rpm not in gear I think its ok to run a bit rich. Your pulls look lean in spots then richens out to .78 at the end of your first pull

[1qwkss]

MAF FAILED CLOSED LOOP FILE.hpt-speed density file
OEM.hpt-original file with rear o2's & COT disabled

these are the original files in which i started the logs with including the OEM VVE, MAF, and most every other table. iirc id only modified some minor settings in DFCO from the original OEM settings.

i had a bit longer of a log but i was in a rush taking the family somewhere and didn't realize i was in a layout that didn't have the proper channels assigned to it

[1qwkss]

So I?d forgotten a VE ?helper? came with that EWM setup and I think I?ve got a way to get better data?my curiosity now is why the afr commanded is now 14.07 rather than the 14.68 it has been in MAF enabled mode

[sgod1100]

Are you going to be running an OL full time? If not just put it back in CL and use your NB o2 sensor to tune all of your part throttle areas. Of course you will need the WB once you go into PE mode

[1qwkss]

all of this is irrelevant...ended up finding out i have a lazy/bad o2 sensor last night when out logging.....changing both of them this evening when i get home from work....that's likely the cause of the inconsistent data i was receiving/plugging into the tables for both MAF and VVE.

[edcmat-l1]

all of this is irrelevant...ended up finding out i have a lazy/bad o2 sensor last night when out logging.....changing both of them this evening when i get home from work....that's likely the cause of the inconsistent data i was receiving/plugging into the tables for both MAF and VVE.

How can you diagnose an O2 sensor when you have it in open loop? Of course it's going to look lazy in open loop.

[1qwkss]

Not just lazy...lost complete voltage on one bank. Threw a code for rich lean o2 after I put it back to oem file even after I cleared codes. Just replaced both sensors and my wideband is MUCH less erratic as I?m out logging again rn

[Guy With A Chevy]

Your saying the log showed 1 working and the other dead? How did you diagnose that? I'd like to see a log with 1 dead o2 google here I come.

Really hard to put the scenario together without data or the whole story. Blew a fuse or had a mass electrical failure on one bank or left it unplugged(done it 100 times)

Glad its rolling or you mean you went outside for the first time today? Mine frustrates me but it moves like hell for 6k lbs above 2k cant figure out 0-2k to save my life trying to learn to log and filter is the Key to this industry is what it looks like

The o2 signals u seen look like this?

[1qwkss]

Your saying the log showed 1 working and the other dead? How did you diagnose that? I'd like to see a log with 1 dead o2 google here I come.

Really hard to put the scenario together without data or the whole story. Blew a fuse or had a mass electrical failure on one bank or left it unplugged(done it 100 times)

Glad its rolling. Mine frustrates me but it moves like hell for 6k lbs

it had been plugged in and functioning fine since i installed the headers/exhaust system over 2 months ago...possible an electronic issue as last night on two separate occassions she aboslutely stumbled like the o2's threw her into limp mode which wouldn't be possible bc the car was in SDOL....now she's leaning out i'm actually starting to think i may have popped a ringland but won't know until i do a leakdown/compression test. no oil in the intake tube...at least not yet anyway. here's the 30 minute drive log i was referencing above along with the file i had loaded for it


AFTER INSTALLING NEW O2 SENSORS LOGGING FOR VVE.hpl
MAF FAILED CLOSED LOOP FILE.hpt

[edcmat-l1]

i'm actually starting to think i may have popped a ringland but won't know until i do a leakdown/compression test. no oil in the intake tube...at least not yet anyway. here's the 30 minute drive log i was referencing above along with the file i had loaded for it

If you think you broke a ring land take the oil filler cap off. If it's rhythmically puffing like a choo choo train, that pretty much confirms it. If no "puff puff puff" you should be fine.

[1qwkss]

I did that last night and I talked to Jeremy this morning. He seems to think everything is normal. The amount of lien activity I am seeing where I am seeing it with my DSL filters turned on and the other filter for idle has me questioning everything because it?s even doing it when I load the stock file back in. I don?t believe I have any flex tables populated, but I need to check that when I get back to my laptop I have the sensor enabled for reading of alcohol content, but I never populated any of the flex tables. That?s kind of like my grasp at straws to see if that?s what?s causing it.

[sgod1100]

I did that last night and I talked to Jeremy this morning. He seems to think everything is normal. The amount of lien activity I am seeing where I am seeing it with my DSL filters turned on and the other filter for idle has me questioning everything because it?s even doing it when I load the stock file back in. I don?t believe I have any flex tables populated, but I need to check that when I get back to my laptop I have the sensor enabled for reading of alcohol content, but I never populated any of the flex tables. That?s kind of like my grasp at straws to see if that?s what?s causing it.

Are you referring to the spark ff table? Because you can easily enable the ff sensor and not add any spark...nothing will change other than the ability to read the alcohol%. Won't affect how the car drives at all.

[1qwkss]

So this has become more peculiar?I?ve disabled the flex sensor and also reverted back to the absolute original file that was in the car when I purchased it.

Car threw a couple codes at me u0100, u0101, u0140 ecm/tcm/bcm loss of communication?started noticing battery was overcharging (roughly 14.8-15.2v) swapped to a brand new yellow top I had sitting spare in my race truck (had been sitting for a few months and started the car at 11.9v) it quickly went up and started charging at 13.8 and I was content?drove to the ups store and was on the phone with a friend when I increased the AC speed (Florida it?s fkn hot &#129397 and watched the voltage on the dash drop while the car was running to ~12.4. Car is still idling fine at ~14.7 +/- .3 and under 2k rpm cruises damn near at 14.7/14.8?but if I add throttle she feels like she?s sluggish and goes 16-17:1 on the wideband?.this is on the OEM file?I?ve even compared my stock file to other year stock V2 files found on the V forums my MAF & VVE tables are identical. Eq ratio is identical and everything else too.i have long tubes on the car with an airaid so I expect to be a HAIR lean but when PE kicks in it?s like she stops trying to fuel?this isn?t a tune issue at this point is it?

[1qwkss]

sitting outside of five guys.hpt
drove to five guys.hpl
drive home from five guys.hpl


can anyone verify for me that the tune is doing exactly as it should be and that this is likely an electrical/mechanical issue somewhere in the vehicle? one of the logs won't have WB Ratio logged as i pulled the fuse for that to see if it had been causing parasitic voltage loss or interfering in anything else electrical with the car on the way home.

[sgod1100]

sitting outside of five guys.hpt
drove to five guys.hpl
drive home from five guys.hpl


can anyone verify for me that the tune is doing exactly as it should be and that this is likely an electrical/mechanical issue somewhere in the vehicle? one of the logs won't have WB Ratio logged as i pulled the fuse for that to see if it had been causing parasitic voltage loss or interfering in anything else electrical with the car on the way home.

So you are just headers and airaid and thats it?? Stock injectors correct? I think you need to go back to the stock tune and start over. You should tune your maf first not your VVE. (I know there are ways to do both at the same time, but I like to do them separate). VVE is a back for the maf and used in transient conditions. Use your narrowband o2 sensors for tuning part throttle areas. No reason to set the car to OL and use your WB to tune the part throttle areas only to have your narrow bands correct it when you turn CL back on.

On your "last attempt" tune I noticed your min injector pulse has been changed from stock, any reason behind that?

[1qwkss]

Not intentionally I hadn't adjusted MINinjpw I might have been playing around with something on the file I was creating for my 1050x's but yeah the car is completely stock aside from airaid, 2" ARH, br7ef's, & accel ceramic wires. Every file I have for the car in compare mode shows no difference whatsoever between any table in injector settings including that "last attempt" file. what did you see differently?

[1qwkss]

i compared it to a 2013 V file from the HPT repository that's supposedly a stock file and my only difference in my file versus theirs was that i've got COT disabled due to no longer having converters on the car. other than that everything is identical. Only DTC's i've got disabled are for sensor 2 and cats as well.

at this point i'm not even trying to tune the VVE or MAF i'm trying to figure out why on the stock file it's going crazy lean under load

[sgod1100]

i compared it to a 2013 V file from the HPT repository that's supposedly a stock file and my only difference in my file versus theirs was that i've got COT disabled due to no longer having converters on the car. other than that everything is identical. Only DTC's i've got disabled are for sensor 2 and cats as well.

at this point i'm not even trying to tune the VVE or MAF i'm trying to figure out why on the stock file it's going crazy lean under load

So I quickly looked at the logs you posted...maybe I'm missing something but where are you going "crazy lean"? I saw you were a little lean in the first log you posted, but that makes sense since you added headers. You need to add fuel via your maf curve. Disregard the min pulse width comment I made previously. For some reason the stock file I was looking at had this altered. I did compare your LAST ATTEMPT file to the OEM one you posted and your injector offset is set to MAP versus Vacuum (OEM file). Any reason why that was changed?

[1qwkss]

So I?ve solved the issue?it?s 100% not tune relative. My alternator wire was resting on the driver side header as the OEM ?zip tie? mount had failed. It arced and put a hole in a primary?under throttle where it should have been running around 11.5:1 it was between 15.5-16.5:1. I may not have posted a log at 3500+rpm. But all resolved now and now I can focus on scaling my MAF and then move onto VVE with accurate information obtained.