GregWS6&z28

iTrader: (8)

I've been reading that i dont need to touch my STFT's. I have stock cam and ported heads and am trying to maximize my WOT fueling for track runs. I'm trying to figure out where I am/will go wrong and if I'm going about this the correct way.
questions...
-I've disabled the MAF fail frequency in HPT to 0hz and don't get a SES light after i rewrite calibration. MAF is still plugged in. reset fuel trims. then go log.
-I log in my Histograms and try to go WOT and fill in the most of the graph I can driving about 40 miles or so.
-after my log I scroll over my log graph to fill in the cells and find out my LTFT's are something like +10 at 100-105kpa.
-I go to my VE table Editor and add 10 )or whatever to all the corresponding cells and reload the tune.
- do i need to reset my fuel trims before i go and relog?
-Should I be commanding closed loop while I'm relearning my fuel curves.
-and do i need to disable DFCO, whatever that is while I'm doing all this?

last but not least when i feel everything is in line I set my MAF fail frequency back to 14000 and reflash my PCM and I should be set??

I've done this method and one day getting +10 LTFT's, the next day i was getting +9 LTFT's again!!!!! Would that explain that I did nothing at all??

Thanks for any help guys.

SSpdDmon

iTrader: (10)

LTFT's at WOT are transfered from learned trims during cruise. Your O2 sensors are crap at WOT and have no clue what's going on. You need a wideband O2 for that. Sounds like you need to read the stickies/tuturials over again.

RedHardSupra

iTrader: (1)

also, if you redo your VE and then reenable MAF, you're gonna be mostly running of MAF, which is oblivious to the new settings. you gotta recalibrate it to match the newly reshaped VE.

DirtyJohn

iTrader: (8)

Also note, if your running a 1999 PCM (like your sig implies), you have a secondary VE table.
If you just adjusted your Primary VE, you wouldn't see the effects after flashing with the new adjustments.
I made this mistake for several flashes, oops.

GregWS6&z28

iTrader: (8)

so My secondary table is just a mirror of my primary? the same changes need to be done on that table too as the primary? when is the PCM switching between tables?

thanks for the help guys.

brad8266

iTrader: (23)

When there is a MAF failure, the engine will operate off the seconday table, this is the one you want to adjust when the MAF is turned off. The you can scale the primary table to reflect the scondary table. Having both tables sucks ***, a want to upgrade to the 2001+ year operating system because they only have 1 table.

brad8266

iTrader: (23)

Dont even try to do any WOT tuning unless you have a wideband in the car. Its worthless. Without the wideband the only tuning you want to do is closed loop.

Also keep in mind that when you turn the MAF back on that the car will provide fueling almost solely on the MAF, so you will have to tune the MAF table as well.

GregWS6&z28

iTrader: (8)

thanks alot. i appreciate it.

LuvmyC5

iTrader: (1)

If you don't have a WB, couldn't you get an idea of the AFR by watching the NB02 voltages? I know that the WB02 is the best way to do it, but would the NB02's get you in the ball park? Just asking because I'm trying to learn this stuff too.

SSpdDmon

iTrader: (10)

Ballpark? Well if you want to use that terminology, 'ballpark' doesn't quite cut it. 'Area 51' is what I'd use...