How does this table work if you run SD? The table values are ran off SAE.MAFQuote:
Originally Posted by SSpdDmon
Thank you.
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How does this table work if you run SD? The table values are ran off SAE.MAFQuote:
Originally Posted by SSpdDmon
Thank you.
GM.DYNAIR reports grams/second.
Updated...Quote:
Originally Posted by 2002_z28_six_speed
Quote:
Originally Posted by SSpdDmon
How does A0014 (IAT VE) interact with A0008 (ECT Commanded fuel) do they multiply on top of one another?
Quote:
Originally Posted by zapp168
That's how the air mass is calculated. Then based on the commanded fuel, current RPM, and other constants in the tune, an IPW is determined based on what the PCM knows to be true about the injectors.Quote:
Originally Posted by EFI Live
A0008, IIRC, simply multiplies the VE by the appropriate value to inflate or deflate the air mass calculation.
A0014 mulitplies the VE table(s) B0101/A0007.
A0008 multiplies the Commanded Fuel table B3647.
Links to other discussion on A0014:
showthread.php?t=5563
showthread.php?t=7132
Anyone ever figure out why this table runs opposite to what one would think... i.e. needs richening up when hotter IAT and leaned out when cold IAT? Exactly opposite of what my logic says - need more fuel when IAT is colder...
Hi BLK, it seems nobody has figured it out, yet.
Hey! Thanks Joe! I've never had time with a car to log it under many IATs and figure out what these guys have - I've been using it backwards...
From what I can figure out, if the table is running opposite it means either your IAT sensor is either suffering from heatsoak, or your charge temp blending is in error. Personally I leave this table set to 1 in the cells the IAT normally will run in during the year. Then just change the extreme areas where you know it is a heatsoak condition causing an incorrect AFR.
I personally dislike this table, because it gives people the wrong idea of what it's for. It should be an aide to deal with situations where the regular bias and lag filter tables aren't enough. But since these two are hard to deal with, people just misuse or ignore them, and use the A0014 as a replacement for the temperature estimator. So you end up with 3 tables fighting each other, trying to arrive at the 'correct' temperature. How about just using what we already have properly instead?
This reminds of a Woody Allen line: "Two wrongs don't make a right. But nobody said anything about three wrongs!"
Ha Ha Ha.Quote:
Originally Posted by redhardsupra
Going from the 2000+ tables in the ls1 pcm just for the engine there is a lot of potential for wrongs to try get things right.
I'm just looking to ensure that the SD cars that I tune using COS 3 or 5 are going to be at their best over various conditions... it is impossible to have a customers car long enough to check the AFR in varying weather/temperature conditions. SOL takes care of part throttle, but I get concerned about WOT variences...
Problem is BLK that a change in the charge temp factor value changes the actual error percentage.
With some quick calculations, a misreported IAT of 10 degC with a factor of 0.15 will give an error of just under 2.8%. Where the same 10 degree error with a factor of 0.25 is now a 2.4% error. Increase the reported IAT error to 20 deg & the same factors then the errors run to 5.7% & 4.9%.
Since the higher the airflow, the lower the factor. Under WOT conditions the correction will need to be set at it's highest. Over 3% per 10 degrees in IAT error.(based on a standard calibration factor of 0.09 at 150 G/SEC.)
So IMHO, all we can do is position the IAT where errors from heatsoak are minimised. Tune the charge temp tables as best we can, & use A00014 to counteract the extreme cases of a heatsoaked sensor.
Old thread, but can anyone assist
Running 01290003, I battled with A0014 for a long time, as it does not work. Logging VE shows no change whether you set A0014 to max (1.3) or min (.8) with no changing in fueling.
Upgraded to a 1mb pcm running 04110003, and A0014 works perfectly - increase/decrease the vaue, and VE increases/decreases accordingly with the desired effect on fueling.
Have had to revert back to 512mb pcm running 0129003, as I could not get traction control to work with the 1mb pcm
Is there any other 512mb COS3 that would work with cable throttle body (other than 01290003)
I tried 0202003, but even changing all the tables affecting ETC/Cable the car will not run (VX cable auto)
Got 12212156 / 02020003 to work
A0014 does not work at all in 0129003.
Thanks for the feedback.Quote:
Originally Posted by izaks
Back to square one.
A0014 works, but many other problems due to different platform in base calibration
.
How can I get A0014 fixed in 0129003, or and other calibration that will work in VX platform
What about trying 0129005, the COS5 version?
See if A0014 works properly in that?
12202088 / 01250003 seems to be working