Simple MAF/DYNAIR pid question.

joecar,

I think we argue over semantics. I learned this stuff without ever reading a book or taking a class(used internet). I started this in the days of the GM 7747 ECU(hated those). My verbiage is usually wrong and my thinking is sometimes wrong.

I am eager to get some basic tuning done in order to see if I have wrecked the VE MAF relationship. I have been rough on the tables. Got fairly good at bashing in tables from setting up aftermarket EFI on most any engine combo that people wanted to build. This MAF system is slightly different and considerably more balanced. It is good that I decided to learn this system on a stock engine(read: easy).

Questions:
1- What are you doing with all of the other(not main) 3d timing tables?
2- Is there a big problem when they are not close to the main table?
3- Do you think I should analyze them in relation to the stock main table and and apply those differences to them based on my final modified main table?
4- Should #3 be done before any serious tuning?
5- What is ICE textbook?

I'll leave you alone after this,
S

PS, Seems that edits are emailed to subscribed members. I been goofin with BB code. Must look like a GOOF.:unsure:

Quote:

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VE*MAP/charge temperature

273.15+IAT+((ECT-IAT)*factor) where factor is obtained from this calibration.

Its a myth..

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of course it's not gonna agree, for multiple reasons:
1. you're using VE not GMVE, so you're missing VOL and R
2. if you were using GMVE and checking your units, you'd be forced to use Kelvin for temps everywhere, which btw is the proper thing to do.
3. this model does not work for all model/years. newer cars have the Lag filter involved. even newer stuff has the bias table is dependent on airflow and speed, instead of just airflow alone. so which model are you testing on what platform?

I am saying that GM.DYNCLYAIR.DMA is not calculating the airmass with any of the Temperature Bias tables input.

Therefore the identical dynamic and cylinder airflow you are searching for is not accurate. Do a log of dynamic and cylinder airflow. You won't see dynamic airflow change as your charge temperatures* factors change.

Matching dynamic and cylinder airflows will get you improper fueling.

WOW!

You 3 have been very helpful. This kind of info takes a lot of time to acquire/proof. I'm very happy that I did not have to re-invent the wheel.

Shawn,
What about factoring air flow g/sec. ie. MAF/GM.DYNAIR? Searching for a method of factoring internal pids without using end result, WBO2.

RHS,
About that kelvin thing... not another temp scale, I have not warmed up to metric yet. :) I suppose I could print a SS that converts 20>240 every 10. What an absolute pain.

Thanks joecar, RHS, and Shawn,
S

Quote:

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Originally Posted by WeathermanShawn

Sounds like you were pretty confused as a 'newbie'.

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Oh yes, we all start at the same zero-knowledge state. Given enough time and education, some of us evolve. If it wasn't for all these posts back then, I wouldn't know much now. This is why it bugs me when sophomores like yourself refuse to learn from the mistakes of the people that have done it all before, yet you go out and end up having the same problems yourself. Why not leverage what's already there? There really is no need to reinvent the wheel.

Marcin, its all in your attitude.

You have a great mind, but no one will ever follow you until you start treating people with respect.

We could learn from you if you changed your attitude.

RHS,

After looking at that post, I cannot make anything from it. It seems to be incomplete. I'm still not sure what you call "charge" temp. Is this the IAT with another modifier or 2 included? ie. ECT blend, or MAT.

Quote:

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VE*MAP/charge temperature
What does this represent?

273.15+IAT+((ECT-IAT)*factor) where factor is obtained from this calibration.
What factor does this represent? What is "this calibration"?

Its a myth..
This I understand. It refers to your providing usefool help ;)

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S

My big nose,

Marcin,

If I may use Your Name, you are an AZZ-O

Steve, Use it if you could possibly have a differing opinion.

Quote:

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Originally Posted by acomp917

RHS,

After looking at that post, I cannot make anything from it. It seems to be incomplete. I'm still not sure what you call "charge" temp. Is this the IAT with another modifier or 2 included? ie. ECT blend, or MAT.



S

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Would it be wrong of me to point out that you quoted Shawn, yet addressed Marcin?

I'm takin my thread back.

On to a lighter subject... Why would anyone call a car "Maloo"? :)

This is not an acronym, ebonics, webonics, or any other Nonsensical Talk. Just trying to be funny.

S