Haans249

iTrader: (24)

Whats the target air intake value at idle in g/s? I've read somewhere that its supposed to be something like 20 g/s? I've been able to read with my predator tuner in lbs/m, and with the help of Gordy M. we read the g/s at like 6-7 at idle?! If I were to have 20 g/s my rpms would be like 2,000, so whats the story on this?

Thanks!
Adrian

DramaFoYoMama

Every car is different, so don't get caught up in the numbers game. Hell, mine idles at 3.8 g/s. Just give your car what it wants and call it a day.

Haans249

iTrader: (24)

alright thats a good enough answer for me

jub jub

My engine sucks 20 grams/s at idle.

Haans249

iTrader: (24)

Nice numbers Jub! I made 441 and 400 with a slightly larger cam! We have a pretty even vehicle I think.

This makes me wonder now, because i have like 6-8 gm's intake at idle, and when I'm driving coming to a light and let out the clutch, my engine almost dies on me, so i wonder if my throttlebody plate isn't open enough. Guess its the perfect day to test it out! Of course, if I were to increase the air intake at idle, my idle will be very high...will my computer compensate for this?

Thanks!
Adrian

DramaFoYoMama

Look at your throttle cracker and throttle follwer tables. If it idles fine, don't mess with your running ariflow table.

jub jub

I'm still working the idle flow issue. My car idles great but when I scan, my GM.MAF and DYNCYLAIR read about 20 grams/sec where my IACDES_B reads about 12 grams/sec, same as I have it tuned for. I also notice that at idle the throttle is cracked plus I have a 5/16" hole drilled in the blade which I reckon accounts for the missing 8 grams. I'm just not sure if the MAF and Desired should match, or not. I'm so confused.

Haans249

iTrader: (24)

I actually, do not have a scanning software only the (predator, which reads lbs/m and i used onlineconversions.com to convert to g/s), and I have never tuned my vehicle, so I don't know exactly what that means, only an idea. But its quite obvious that when I had it tuned, those value probably weren't tuned properly, so I'm guessing that messing with my idle air flow probably isn't going to do anything except make matters worse.

But just for testing purposes, i'm going to crack my plate open so I'm flowing like 16-18 g/s ,and then reset my TPS to read 0, and see what happens.

Thanks!
Adrian

Haans249

iTrader: (24)

Just to check again, the GM.MAF reads the intake flow from the MAF correct? So, I'm going to shoot for a value around 16-18 gms for that, but what about my IAC valve, is it going to compensate depending on what the tune says my idle air flow should be? And also, can you have an idle air flow of 16-18 but still keep relatively stock idle? What sets the idle on the vehicle?

Thanks, I'm a newbie I know, but I'm trying to solve this pain in the *** problem,
Adrian

jub jub

Yes, GM.MAF is reported from the MAF and is actually measured airflow. Of course, how accurate this figure is depends on actual calibration of the MAF. Since I have a cold air intake, I had to recalibrate my MAF by logging my DYNCYLAIR (calculated by the PCM) against MAF frequency and using that data to rebuild my GM.MAF sensor calibration table.

The GM.IACDES is based on the running air flow or RAF as some call it and is what controls the IAC or base idle. Of course, other air measurements are based on this figure. It is here where I'm a little confused as to what these figures are in relation to each other.

My car runs fine the way it is so I'm not to worried about it. I would however, like to understand the relationship between all the IAC pids and dynamic airflow.

Haans249

iTrader: (24)

Hmm, this maybe pointing towards the direction of problem that I'm having. I have a CAI, but I'm not sure that my MAF has been remapped. Maybe this is an issue...

jimmyblue

iTrader: (11)

My MAF reading is about 7g/sec at 700RPM idle.
I have stock cam. The cam is really going to
swing things. A M6 with even less idle drag,
might well see lower.