KuntryQuestTSi Posted March 13, 2013 Share Posted March 13, 2013 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? Link to comment Share on other sites More sharing options...
trhull Posted March 13, 2013 Share Posted March 13, 2013 What do you mean by "maxed out"? To me it sounds like you need to rescale your MAF voltage, I doubt you've reached the choke flow limit of the actual housing at 270hp. My $0.02, hope it helps Link to comment Share on other sites More sharing options...
I Donated Too sigmafour Posted March 13, 2013 I Donated Too Share Posted March 13, 2013 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? Link to comment Share on other sites More sharing options...
Max Capacity Posted March 13, 2013 Share Posted March 13, 2013 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 Link to comment Share on other sites More sharing options...
KuntryQuestTSi Posted March 14, 2013 Author Share Posted March 14, 2013 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. err So, there is my problem. Link to comment Share on other sites More sharing options...
I Donated Too sigmafour Posted March 14, 2013 I Donated Too Share Posted March 14, 2013 indeed. Link to comment Share on other sites More sharing options...
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