Anyone here ever used the EFI Live scan tool to help them correct the MAF voltage table for a larger intake tube? What I'm thinking is perhaps a guy could calculate the airflow using the engine speed and manifold pressure, the way a speed density system does in the gasser world. This is solely for my own feel good, knowing that the reading of the MAF will be reasonably accurate. I know that i will have to take volumetric efficiency into account, and that is where I am seeking some help. Anyone want to assist me in creating a calculated PID that might be able to make this happen?
LB7: MAF voltage table
- Thread starter Mike_S
- Start date
Log factory sized intake.
Note MAF voltage.
Log new intake.
Rescale MAF to original voltage values.
Note MAF voltage.
Log new intake.
Rescale MAF to original voltage values.
Not quite that easy in my case, as a factory sized intake is not really interchangeable when my turbo draws from the left side of the truck. Maybe i could use a log from another truck, anyone with a stock sized intake and an S464 turbo?
On edit: I see you are doing this for measurement purposes, as opposed to tuning for the new intake.
The problem is that the MAF table is used for fuel limiting and doesnt offer a lot of expandability, nor will it ever show our big flow numbers with big chargers.
The important part of this equation is the speed of air going through the new intake. It is measured in grams per second. The voltages provide this information via having the wire in the MAF being cooled by the incoming air which equates to a speed of air. It is really simple to correct these numbers and it takes logging some data to make those corrections.
I expected to have a fair amount of logging to get it right. Could you expand uppon this? Got any calculations or equasions i could use to get it right?
There is only one item that needs to be logged and that is the gr/sec numbers MAX. They should read at idle 38/42. They should read at WOT between 400-500. If you have a erasing say of 30 you will need to increase voltages across the table by 1.25 to bring idle back up to 40. It works out perfectly.
Sent from my DROID RAZR using Tapatalk
Sent from my DROID RAZR using Tapatalk
You probably should rescale it. If it is off much you will notice that the truck seems a little lazy.
