max airflow vs. boost

[tiwing]

I lack the funds for a wideband. I don't know what duty cycle my injectors are running at. I don't have money to replace my motor.

But I did wire in a cool gauge that tells me % of max airflow through the MAF. Assuming that .9V is about 15% airflow, and knowing that 5V is the max value that the MAF can report regardless of the actual airflow, does it make sense that the stock injectors etc. can all handle up to 100% of the stock measurable airflow?

I guess what I'm getting at is, with the new gauge I've wired in, can I increase the boost until I'm hitting peak of 98-99% of airflow and still be "safe"?

So far the readings I've found: at 6psi: airflow peaks at 88% of max. at 8.5 psi, it peaks at 96% of max airflow... Maybe I can hit 9-9.5 psi before hitting 99% of airflow.

Once the MAF maxes out, the ecu "should" only supply enough fuel for the max reading of airflow, correct? So if I go over 100%, there won't be enough fuel and the whole shot will run lean... maybe this is why people have said that the MSP starts to really lean out at 9~ psi - the MAF can't register more airflow.. ??

Your thoughts? <!--Signature-->

 

[jeffmsp]

im pretty sure people max the injectors out before having to change the maf. Dont think the stock injectors can take much more than a tuned 10psi, and the maf can for sure.

 

[tiwing]

i'm hitting 95-96% of MAF voltage at 8.5 psi though - how can the MAF report that much more airflow in the last 4-5% of it's voltage range?

 

[peepsalot]

I have a kinda relevant question, the ECU does fuel cut(or spark cut, I've heard arguments both ways) based on a max MAF voltage. Is this voltage exactly 5v, or something less?

 

[tiwing]

I believe the service manual says 5V is the max MAF voltage...