Gold Phoenix

iTrader: (1)

I was looking at my HPT scan and saw that my dynamic airflow (SD tuning) peaked at 512 g/sec and stayed flat from 5300 to 7200. Is there something in the editor that is limiting this or is it just the limits of the ECU?

bigtymn

its the computer! you can buy a larger maf and rescale

foff667

iTrader: (2)

that just means your logging maf, but why you would be logging maf when your running a 2 bar SD operating system? But yes there is an internal limit of 512g/sec which is why most people recommend going SD once you hit this limit



PS-delete the PID otherwise it can skew your readings.

Gold Phoenix

iTrader: (1)

So it is just an estimation of airflow and not calculated?

bigtymn

you can tune the ve too!

foff667

iTrader: (2)

no its the max value the pcm can read so once you hit that point it just flatlines.

jimmyblue

iTrader: (11)

Is it true that dynamic airflow is not really used in the custom
SD OSes? If so what can you look at, for airflow value instead?

Gold Phoenix

iTrader: (1)

OK, this is for my T/A. I intend to install a D1SC kit with full exhaust system. I also have a SLP 85mm MAF sensor. I am only looking for 7-9psi of boost. Which sensor would work better and how does I go about adjusting the calibration for the larger MAF sensor?

12secSS

iTrader: (30)

Don't! You need to use the 2-BAR OS to take full advantage of your setup, since you are going to be pushing 7-9psi.

Gold Phoenix

iTrader: (1)

OK, I am not wanting to go SD on the T/A as of yet. I am only look to make 450-500whp with the D1SC and full exhaust system. I will seriously think about it when I replace the motor with forged internals.

ringram

?? rescale what? Airflow will still max at 512g/sec its a PCM limitation on the 99+ LSx ECM's (0411 model from memory) You can rescale your MAP sensor for FI installs with a 2bar+ sensor, but not the MAF. Its going to pump out the same frequency whatever happens and never see more than 512g/sec


Actually there is a calculated airflow measured in g/sec the same as MAF for SD, efilive has a custom pid to show it to you.

P Mack

iTrader: (6)

Right, you'd have to trick the pcm by telling it that both the maf and the injectors are smaller than they really are by the same percentage.

ringram

10 4 .. but surely..

Still no good for Strokers, Max NA or FI as you will lose resolution when frequency is maxed out. Which will still happen around 450rwhp!?

bigtymn

i read how to rescale out of an advanced fuel injection book for gm's
it is posible the maf is only used to calculate load similar to a map on a sd tune
therefore you may cali brate it how ever you want

ringram

You will have to recalibrate the MAF so it doesnt read 12Khz when airflow is over 440g/sec otherwise its pointless. So you need a MAF that allows this. Its not a ECM only job. Sounds like a lot of work when a much easier answer is just to run Speed density doesn't it!?