Any one know the actual inner diameter of the maf housing pipe?

Any one have scaling info/ map for it?

 

Okay went and got a set of digital callipers finally.

AEM intake ID = 2.84" or 72mm

Stock MAF ID = 2.67" or 68mm (67.92mm)

Base on the Formula for mac scaling:

That would be

(2.84/2.67)^2 = 1.12


How do I apply this now?

 

You multiply 1.12 across all 3 MAF scaling tables. I use Excel for that. Copy the existing values from EcuFlash, paste it in Excel. Multiple those values by 1.12 and paste the new value back into EcuFlash.

 

Can you not just highlight the values, click multiply data, the little box comes up and enter 1.12?

That's what I ended up doing. Hope that's right.

 

This sounds easy and makes me want to put my AEM intake on and do this. Is that all i have to do? Will i have to adjust anything else on my tune? -- I think i should just bring it to my tuner huh? lol...

 

Oh yes, definitely you could do that. It didn't occur to me right away as I keep my tuning log in an Excel...

Next you need to verify your LTFT are within +-5%

 

So +/- of what? I was trying to figure this out. My logs just say like .08-- for cruise and my idle was like 4.3 what that means I have no idea.

 

Does it also mean that I can insert something in there to reduce the area by 140 mm square and I don't have to scale anything ?