VE table values well over 100

[animuL]

I recently upgraded my Corvette by swapping out the stock LS1 with a new Texas-Speed 408. In tuning my VE table I started out seeing numbers from my log file histogram around 30, 40, 50% for my STFTs (LTFTs I turned off). As I work the tune the histogram is getting numbers closer to 0, right now after 3 or 4 iterations they are 0 +/-10% but many of the values are 110 or so in my VE table. My assumption is that is because I simply have a lot more volume in each cylinder than the PCM and thus VE table is expecting, but I did change the General parameters to say its a 408 ci "6.0L". Is this normal / okay or am I needing to change something else? The afr is staying about where is should be for the most part, even when I have added 30% across the entire VE table the wideband seems to read about the same before and after.

[Bill@HPTuners]

maf likely isn't failed.

[animuL]

maf likely isn't failed.

Fail is set to 0hz but it is still plugged in.

[Bill@HPTuners]

That is only part of the equation as pretty much anyone with any experience tuning SD will tell you. I've seen hundreds of tunes with it set to 0, that doesn't mean the pcm will fall into speed density mode

[Bill@HPTuners]

BTW http://www.hptuners.com/forum/showth...og-amp-cfg-too

[animuL]

That is only part of the equation as pretty much anyone with any experience tuning SD will tell you. I've seen hundreds of tunes with it set to 0, that doesn't mean the pcm will fall into speed density mode

Okay thanks. I'll start over... again.

[Bill@HPTuners]

why not post your file so that maybe we can give you some advice...

[animuL]

why not post your file so that maybe we can give you some advice...

I'm at work and dont have it with me. I can post it once I get home but first I'll probably unplug the MAF and see what it does.

[Bill@HPTuners]

Lol that doesn't exactly always work either to be completely honest with you my friend.

[animuL]

Okay, 2 files attached. "initial" is my stock tune with modifications made based on several threads that I have read, it is not based on any actual tuning of the car. The "in work" file is where I am at after several iterations of adjustments to the VE table to get my STFTs down. I guess the VEs aren't as high as I thought but still many over 100 and some areas the STFTs are still 15%.

[mowton]

Okay, 2 files attached. "initial" is my stock tune with modifications made based on several threads that I have read, it is not based on any actual tuning of the car. The "in work" file is where I am at after several iterations of adjustments to the VE table to get my STFTs down. I guess the VEs aren't as high as I thought but still many over 100 and some areas the STFTs are still 15%.

Change DTC P0101, 0102 and 0103 to Mil on first error. As Bill said, you haven't failed into SD.

Ed M

[FNG81]

Change DTC P0101, 0102 and 0103 to Mil on first error. As Bill said, you haven't failed into SD.

Ed M

Okay, 2 files attached. "initial" is my stock tune with modifications made based on several threads that I have read, it is not based on any actual tuning of the car. The "in work" file is where I am at after several iterations of adjustments to the VE table to get my STFTs down. I guess the VEs aren't as high as I thought but still many over 100 and some areas the STFTs are still 15%.

As Mowtown said, do it like that and leave the SES boxes checked. Your check engine light will come on if the maf is truly failed.

[animuL]

Okay, I'll try that out tomorrow and see if the light comes on before I go into adjusting the tune. Thanks!

[SultanHassanMasTuning]

if you will be tuning SD even at WOT I recommend to changing dynamic to disable and change 4000rpm to say 8000

[blownbluez06]

Don't bother keeping your MIL enabled if you don't want to. just use the scanner to pull your codes. You'll see them pop up once it's failed properly.
Next tip: the adjustments you make to your primary table while in SD mode are totally ineffective because it's only reading the secondary table. Create a custom histogram for the secondary table, copy and paste it into the primary, interpolate vertically and horizontally in between, hand blend and you'll make the progress you're looking for.

Final tip: Why is your underspeed spark table zero'd out?

[animuL]

Don't bother keeping your MIL enabled if you don't want to. just use the scanner to pull your codes. You'll see them pop up once it's failed properly.
Next tip: the adjustments you make to your primary table while in SD mode are totally ineffective because it's only reading the secondary table. Create a custom histogram for the secondary table, copy and paste it into the primary, interpolate vertically and horizontally in between, hand blend and you'll make the progress you're looking for.

Final tip: Why is your underspeed spark table zero'd out?

I'd have to double check the original tune but I dont recall ever changing the underspeed spark. I did notice it was all 0s and tried entering in 4 for everything to see if it would help with an issue where when I put it in gear it stumbles and sometimes dies. Right after loading that tune it suddenly didn't want to start at all so I just changed it back. Could have been a coincidence?

My plan, unless I am convinced otherwise, was to always run the car in sd mode. Reason is that I have read a properly done sd tune works as good as or better than a maf tune especially for cammed cars because the changes in the tune resulting from maf readings don't happen as fast as the programmed in ve numbers. Then the other reason is that a mafless setup is a little cleaner and more simple, not to mention cheaper when I upgrade to a 102mm intake. Is this bad info? Is it better to run with the MAF? If it uses the secondary table when in sd mode does it use the primary in conjunction with the maf tables in regular maf mode?

BTW this car is not a race car. I drive it when the weather is nice to work and on the weekends it sees maybe 3k miles a year. Having said that, I do want to take it to the track every once in a while after its properly tuned and I do want it to have the manners of a fairly stock car. Also its naturally aspirated and runs on 91.

[Bill@HPTuners]

If you plan on tuning in speed density you might consider reading the speed density tuning how to in the help file www.hptuners.com/help its a really good starting point and you probably wouldn't have made the original post if you had used it as such

[animuL]

If you plan on tuning in speed density you might consider reading the speed density tuning how to in the help file www.hptuners.com/help its a really good starting point and you probably wouldn't have made the original post if you had used it as such

Oh yeah, I remember reading that before. I'll try this again.

[animuL]

I took my initial tune from the above post and started following the SD Tuning guide in the Help section. It did throw the P0103 MAF code right away and I just let it idle up to temp. Once the car got up to around 180 it started stumbling bad, the dic displayed "Reduced Engine Power", and the car died. I checked the codes and found a P1514 - Airflow to TP Sensor Correlation High. I clear it and it comes right back and the car wont stay running. I have attached the tune and log file for reference. FWIW I might note that this is has an electronic throttle.


EDIT: I noticed from the log file that the first thing to go haywire was the timing dropped to nothing. I tried setting the timing at a constant 27° but it did no good, it still throws the 1514 code instantly and persistently and barely idles.

[mowton]

You are missing your IAT input (see -38 degrees)...did you unplug the MAF? Need this input.

Ed M