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Old 04-24-2012, 08:54 AM   #1
ehiddenidentity01
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Join Date: Apr 2011
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Default scaling a maf for blow through setup

so i have an 05 sti im working on. thinking about re locating the maf to the bend right before the throttle body so the bov venting to atmosphere wont effect the reading.
i have rescaled for different intakes and filters and things like that but never moved one to the pressure side. how does the psi effect the readings or does it?
i have heard that doing this will kill your driveability but i feel like if you spend enough time on it u can get it to work smoothly. does anyone have any experience with this and or any advice before i approach this?
i would appreciate not seeing"take it to a professional" or "if you have to ask this you shouldnt be doing it"

mods:
aps fmic
dw 850 injectors
k&n short ram intake n filter
street light fly wheel
south bend stage three clutch
walbro 255 fuel pump
tial bov
and custom 4in tbe
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Old 04-24-2012, 09:02 AM   #2
Black94Snake
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The stock MAF is not a "blow through" design. You would be better off with a recirculating system, or speed density.
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Old 04-24-2012, 10:04 AM   #3
Jubert69
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http://forums.nasioc.com/forums/show....php?t=2196695

Doesn't answer your question, but a lot of good info.
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Old 04-24-2012, 11:11 AM   #4
Bamofo
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If you can rescale for a bigmaf or different size intake you should be good to go. Its not hard at all. Things you should know.. you want the maf sensor at the end of a nice straight piece so the air doesnt swirl much. Second thing is that you will have no idea if you have a boost leak anywhere before it so you have to be aware of how fast it is when you know there are no leaks. I have done it on just about every car that comes through my shop with minimal issues.

Issues include leaky turbo spraying mist of oil... blow by that mists... but thats it.. if you clean the maf once a month with maf cleaner you will be golden. Good luck and PM me if you have any questions!
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Old 04-25-2012, 07:44 AM   #5
ehiddenidentity01
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Quote:
Originally Posted by Black94Snake View Post
The stock MAF is not a "blow through" design. You would be better off with a recirculating system, or speed density.
can you do speed density on the stock ecu?
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Old 04-25-2012, 08:06 AM   #6
Black94Snake
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Quote:
Originally Posted by ehiddenidentity01

can you do speed density on the stock ecu?
I wouldn't have said it, if it couldn't be done.
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