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MAF housing maxed @ 10psi?

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Engine - EJ257 (STi) shortblock

Rebuilt heads by drakes who also did all the machining.

Manley Valves/springs/ retainers

Ferra guides

Manley pistons 8.5:1 Stock bore

Polished crank

ACL main and rod bearings.

OE gasket kit.

XO2 front mount

BNR VF40 TD05-18G turbo.

SPT Short ram

Perrin(I think) inlet hose

Invidia catless up pipe and 3in down pipe.

Gimmick Motorsports 3in stainless cat back.

TGV delete.

Gates T-belt kit

Water pump

08+ STi oil pump


I maxed my MAG housing at 10PSI @ only 270 AWHP


Now, I have a KStech MAF that I haven't installed, but I feel there is something else I am missing.


Boost leak under boost maybe?

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I presume you mean MAF at the end and not MAG - I searched for MAG housing as a brand... Are you talking about the stock airbox? The stock airbox as many of us still have will flow for a lot more power than 270AWHP - there is indeed something else going on as you suspect. Boost leak under boost, as opposed to any other time? Have you performed a simple boost leak test at all, do you have a boost gauge - did the tuner - was 10psi all you made for boost?
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Your MAF should not be seeing boost.


As far as I know, boost is after the turbo.


Where is your MAF sensor ?

305,600miles 5/2012 ej257 short block, 8/2011 installed VF52 turbo, @20.8psi, 280whp, 300ftlbs. (SOLD).  CHECK your oil, these cars use it.


Engine Build - Click Here

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My MAF was at max voltage, and seeing I'm only open source I don't have much I can do until I get to speed density.


I was told I needed a bigger MAF housing to get more power, but after last night I found my BPV won't hold more than 8-10 psi. It spikes at 14 and then bleeds down to 8 psi and holds there.


So, there is my problem.

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