PCM Diagnostics & Tuning - 98 maf limit - is it the maf sensor, or the pcm?

Because if it's the pcm, I can rescale the maf output signal before it gets to the pcm, by 10-15%. A 15% rescale will handle about 50% more airflow.

That is if the maf sensor will continue to output a higher frequency and not freeze at some ceiling.

What is the upper limit the maf sensor will generate?

And since I have a Granatelli 85mm maf sensor (with resistor removed), will it have a higher output limit than the stock '98 maf sensor? And does anybody know what that upper limit is?

11250 is the frequency limit, and 512 grams a second is the pcm internal limit.

You can scale all of the airflow tables to get around this though ;)

Ryan

11250 is the frequency limit, and 512 grams a second is the pcm internal limit.

You can scale all of the airflow tables to get around this though ;)

Ryan


Like how? I'm not following you.

I'm thinking the table in the pcm only goes out to a certain frequency too.

I thought you couldn't use a non-resistor-modified MAF, such as a Delphi 85mm, since the celing on the PCM...

The table only does go out to a certain frequency and the MAF's are capable of outputting a higher frequency than our PCM's can handle. That was always my conception before anyhow. :confused:

I just so happen to have a Delphi 85 laying around (it's actually installed right now but I'm running SD for the time being)...so does this mean I can adjust some tables and actually use it without hitting the celing?

ttt since I would like to know more about this (my question and the one from rush7)