Did some logs yesterday and it seems my stock maf's are almost maxed out right at 17psi with the gtm tt kit. 3" intake tubes. GTM knew that, that's why they went with bigger intakes..

If any of you need upgrades, I can get you a good deal on our Z-MAFs.

I plan to be pushing 18psi in the next couple of weeks. I'll let you know how my setup works with the tall maf stand offs

Since this got bumped up today ill post something I noticed.

Does anyone see that even though the MAF voltage is not maxed out the flow rate max's out within Uprev? Is this a limitation to Uprev or the ECU itself? I want to say off the top of my head that the max flow it will read is something like 268 or something like that, but there is still plenty of voltage to go.

I can verify that that's the MAFgm's I'm seeing NA (268.79) with MAF volts mid low 4's 4.2's-3's

Yeah and it does not increase if you go with a higher voltage than 4.2.I dont know if this is a limitation to the logging software in Uprev or what.

Mine are right at 4.8v right at 17psi in the upper rpm range..

But what does your flow rate do right around there? Mine maxx's out even though there is still breathing room in terms of voltage.

More than happy to post up my log if you guys have the program to view it.?

i got it...

Post it up its all done in CSV format anyway. Or if you could confirm that lets say above 4.5 volts that the maf flow rate continues to rise after 4.5 volts?

Trying to upload but it keep coming back saying invalid file.. ideas?

screen shot or pic off your phone

I wouldn't expect mine to be maxing at 5 NA but heres mine at 4.9Vlts and the 268.79 MAFgm's


MAS A/F -B1 (V) 4.26

MAS A/F -B2 (V) 4.49

B-FUEL SCHDL (ms) 19.7

MAF GM/S (gm/s) 268.79

Yeah that 268.79 will stay there at like anything after 4.1 volts if I recall correctly. I dont know if thats a limitation on the car or in the uprev package. I guess the way to find out is call and ask them about it.