SVT MAF require a MAFia on a zetec with 12lbs or less? - Focus Fanatics
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Old 05-08-2013, 04:13 PM   #1
drunkyoda
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SVT MAF require a MAFia on a zetec with 12lbs or less?

like the title says if i were to get a SVT MAF and housing would i need a MAFia still to get the correct readings on 12 lbs or less?


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Old 05-08-2013, 04:16 PM   #2
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yes. ive tried running without a mafia before and just getting the fuel right for idle it runs like ass
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Old 05-08-2013, 04:21 PM   #3
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so you had a SVT MAF and the housing? because an SVT MAF housing is 68mm which is almost 3" so that would mean the MAF is calibrated for it and should read the higher amounts of air coming through the housing?
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Old 05-08-2013, 04:25 PM   #4
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do the svt and regular zetec use the same MAF?

what about a sn95 sohc mustang?
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Old 05-08-2013, 05:00 PM   #5
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ok more research provided me with this:

sn95 maf = 70mm which = 2.75" so 1/4" smaller than a 3"... idk if this is worth it because it looks like you need an adapter to run it also.

SVT maf = 69mm which = 2.67" which is roughly 3/8" smaller so this wont work without it running weird i would think but im not sure on that. someone should chime in.

looks like i will be forking over the money for a 3" MAF unless someone knows of a better alternative..
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Old 05-08-2013, 05:16 PM   #6
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unfortunately shane the boost world is a headache that eats your wallet, ask how I would know this
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Old 05-08-2013, 05:27 PM   #7
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meh. i think i have found some good deals so far and have been doing a lot of research. by the time im done piecing it all together it will be a snap to put in and get running.
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Old 05-08-2013, 06:20 PM   #8
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You really need the tranfer function for any aftermarket MAF you put on or you could cause huge issues if you don't know how to cal it. Keeping the stock MAF has the correct (at least 95+% there, as it is flowed as an assembly that you don't have anymore) transfer fcn. I found on my SVT that I max out the cold air inlet (~2.75") at about 11psi at 6k rpm.
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Old 05-08-2013, 08:01 PM   #9
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You wont make 11psi on a SVT MAF and MAF tube and not exceed 990 counts

To do it right you need a 3 inch MAF tune , stock Focus Electronics , MAFia , you can take bad advise and use a mustang or some other MAF but it will never be right

If you go blowthrough MAF you can take the stock MTF and throw them out the window it all changes with blowthrough , then add 3 inch MAF tube and MAFia and ????

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Old 05-08-2013, 08:15 PM   #10
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What do you guys mean "max out"?

Because I don't think you're understanding something correct.
The MAFS itself does not have a limit. The limit is in the ECU.

A MAFS produces a Voltage relative to the Mass of the air flowing through it. The output voltage is biased from the 5 volt reference voltage. When the output voltage matches the reference voltage, the MAFS is 'maxed'.

The limitations you can adjust in the ECU with SCT,
MAF -> Scalar -> MAF Maximum AD Counts : Change to 1023
MAF -> Scalar -> Threshold for Over Voltage Condition : this determines how far over 1023 / 5 Volts you can go before the MAFS shuts off
MAF -> Scalar -> Time at Over Voltage to Be Failed : Pretty simple, time based failure

You can also use the Load W/Failed MAF table and RPM to Set Failed MAF/ It's a band-aid fix and there are inherent risks.

By default the limit of the MAF is 4.69 Volts (960 counts), which is about 23 #/min or 230HP.
960 counts on my MTF is about 33 #/min.


What the MAFia does is raises the reference voltage, which in turn raises the limit in the ECU.
The problem I have with them (though I've never used one) is that once the MAF has reached it's natural limit you are running beyond the MTF. That means fueling might not be correct and I'd think might be hard to dial in.

I still think the best way is to get a larger tube and scale the MTF. I don't find that hard to do at all.
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