Join Date: Aug 2009
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that turned out surprisingly clean, congrats. seems like a more logical place to have the maf any way.
and i hate to admit it, but i miss the bov sound from my old mazda, so i cant blame you for wanting the noise back either.
Well I decided to go blow through on my 09 WRX, why? 1. I miss my TurboXS RFL BOV, 2. I donít care what others think about the sound, (not you guys) 300+AWHP I donít see as "rice" 3. I wanted better readings and give my tuner better time tuning, 4. I wanted to see about HP gains if any, 5. I wanted my MAF sensor to see cooler temps from the cold side of the intercooler instead of before the turbo and 6. I think I'm the first on an 09, well at least around here!
So I already had the TurboXS CAI. My tuner loved it!! They made a perfect MAF housing. 66mm on the inside just like stock and right where it should be, a really nice piece and gave zero headaches while tuning.
So I thought why mess with a good piece and spend money on a blow-through housing when I can just use this one!
First thing I did was cut the CAI before the weld (see pic). Two reasons, 1. The weld acts as a bump so the silicone coupler doesnít pop off if the clamp isnít tight enough. Just like all my intercooler piping that have ribs and 2. I didnít know how they tapered the inside so better to leave it where I know the pipe is just 73mm before the taper.
Next I jumped on ebay and bought a 24" long 3" round piece of aluminum pipe (shortest I could find), 3" coupler and 2 T-bolt clamps for $25.
^^^^This is how I replaced the MAF housing that I just cut out. One Pro I see so far is the TurboXS CAI was 73mm (3 inches) from the filter to the weld. Then it drops to 66mm and attaches to the turbo inlet. Now the CAI is 73mm all the way from the filter to the turbo inlet. I'm just thinking maybe thatís a little better for the turbo to be able to suck in a larger amount of air due to larger diameter pipe, inlet kills it of course but im thinkin positive!
Next I cut my TurboXS intercooler piping (see pic) and I bought 2 more couplers, 3 inch reducing down to 2.5 inch and 2 more T-bolt clamps for $25. The TurboXS MAF housing is 3" and the intercooler pipe is 2.5. DURR! I picked this spot because the MAF sensor must be in a strait piece of pipe, close to the throttle body and away from bends in pipe.
Next I needed to add length to the MAF sensor harness. About a foot and a half did the trick and I routed it nicely ect ect. I had everything so FREEBIE
Next I needed to block off the stock BPV flange. My friend made me a piece of aluminum same size as the flange and another gave me gasket material to put in between the two. I also found a copper plug to put into the BPV to inlet hose. Not sure if im going to keep this here because it looks trashy, but getting to the inlet is a PITA to cap off the hose if I take it off.
Last my friend welded on my TurboXS RFL BOV flange and I installed the BOV 18 inches away from the MAF sensor as my tuner told me to.
Next is a tune. I was going to tune anyways for 18-19psi with the FMIC and BOV but moving the MAF I hope will make it all go a little better. So far the car drives stock! BOV can do its thing and there is no back firing or hesitation or anything, itís a gem! All and all not bad for about $50.
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