I get asked this question fairly often, so I figured it was time to put a page up about it.
“Is there an advantage to replacing my existing MAFT setup with V3's GM MAF integration?”
The answer is, “it depends”. First, if your MAFT setup is currently working fine for you and you have no interest in clearing out your engine bay or having more direct control over the MAF translation function, then by all means leave well enough alone. No reason to upset a working solution just to change it.
But, if you'd like to remove some clutter under the hood or you'd like to have more direct (and finer-grained) control over the MAF translation function, then consider replacing the GM MAFT with our direct cable and V3's GM MAF function. Our cable also provides some convenient break outs for access to the baro and IAT inputs of the ECU, which can be handy when wiring in aftermarket sensors for logging.
When working with a GM MAFT, the ECU is seeing frequencies that look roughly like a factory Mitsubishi airflow sensor. So adjustments you make to those frequencies are limited to the factory frequency range. The GM MAF itself actually has a pretty wide frequency range at idle and cruise. It's very fine-grained and you'll gain a good bit of control over that range if you run the GM MAF directly to the ECU.
For example, with a factory sensor or the GM MAFT installed, you'll idle around 50hz. Which means you would use the 50hz slider to adjust idle airflow. The next adjustment point isn't until 100hz.
But with a GM MAF straight to the ECU, you would typically idle around the 500hz. That seems trivial until you consider the next and previous adjustment points provided in ECMLink of 600hz and 400hz… Those are, again, in GM MAF frequencies. They correspond to roughly 70hz and 30hz for a factory sensor. So, effectively you have adjustment points at roughly 0, 10, 30, 50, 70hz and 90hz if you're running a GM MAF straight to the ECU instead of the 0, 50, and 100 you would have with a MAFT or a factory sensor in the same idling conditions. So you get a lot more fine-grained control over the translation when running a GM MAF straight to the ECU.
We also have a built-in function to help dial a GM MAF configuration in. You can read more about it on the GM MAF Adj page.