full APS intake - Subaru WRX Forum
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post #1 of 17 Old 02-21-2006, 09:56 AM Thread Starter
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full APS intake

now that Gruppe-S is selling the APS "inlet" system, im thinking that there is now a superior alternative to the silicone inlet pipes sold by samco and perrin. the question is would a full APS intake system including their inlet pipe and pod intake be the best way to go?

it is true that this would be a little more expensive than the other options, but since APS is one of the best manufacturers out there, in my mind it is money well spent.

thoughts?
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post #2 of 17 Old 02-21-2006, 11:19 AM
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they're all waistes of money imho. The WRX's intake is not going to get any better than stock with that MAF
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post #3 of 17 Old 02-21-2006, 11:38 AM Thread Starter
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ya really think that the MAF is that big of a restriction?!
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post #4 of 17 Old 02-21-2006, 01:31 PM
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what are some good options for upgrading the MAF? and when would you do so?
after exhaust upgrade? after/befroe turbo upgrade?
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post #5 of 17 Old 02-21-2006, 05:42 PM
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Originally Posted by poser
what are some good options for upgrading the MAF? and when would you do so?
after exhaust upgrade? after/befroe turbo upgrade?
You cannot upgrade the MAF.You can just buy a bigger sized intake and recalibrate through tuning or switch to speed density.Unless you are pushing 350hp+ this isn't a concern.The stock box is more than enough.Plus there are some tricks for the stock box.
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post #6 of 17 Old 02-21-2006, 05:43 PM
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Ok you got my attention. What tricks do you mean?

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post #7 of 17 Old 02-21-2006, 06:13 PM
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i have read about the silencer deleat, are there any others?
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post #8 of 17 Old 02-22-2006, 06:17 AM
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Ok you got my attention. What tricks do you mean?


The velocity stack mod is pretty common.Most use a 3" that can be found at Pepboys or through Summit Racing.I personally went with a 4" turbo bellmouth that tapers from 5 1/2"-4".Runs about $30 and gives you that intake/turbo sound plus faster spool up/throttle responce.Another one is here:
http://www.projectwrx.com/modules.ph...showpage&pid=9 Its the "airbox hack" mod.
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post #9 of 17 Old 02-22-2006, 10:17 PM
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That last pic is rediculous looking. and common now how could that make a different sound and non the less spool up faster? Are you being serious? silencer delete helps for turbo noise and bov sound some. add a downpipe and youll get some serious noise from the turbo.
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post #10 of 17 Old 02-23-2006, 06:08 AM
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That last pic is rediculous looking. and common now how could that make a different sound and non the less spool up faster? Are you being serious? silencer delete helps for turbo noise and bov sound some. add a downpipe and youll get some serious noise from the turbo.
Do even know what a velocity stack is and what it does?They have only been using them for over 60 years on cars.In fact if you open your airbox and look inside the top half you will see a velocity stack right in front of the MAF housing/air inlet.A velocity stack actually speeds up the air as it is passed through it.A lot of aftermarket intakes and filters have these intergrated into them as well.By removing the silencer and opening up the inlet hole in the air box a pressure drop is created infront of the turbo allowing less resistance for the compressor wheel to spin.Shortning the intake tract length helps responce as well.The more bends/tighter bends cause more restriction,just like in exhaust systems.That 180 degree bend from the silencer elbow is nasty.And believe or not the silencer delete elbow's I.D. is slightly smaller than the stock elbow!There is comparison pics on other forums of the two elbows and i have measured it myself.Its roughly a 3/8" difference.The inverse effect would be adding a high flowing turboback exhaust that causes a pressure drop behind the turbine wheel alowing less restriction and faster spool up.

Last edited by dumdum; 02-23-2006 at 07:55 AM.
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post #11 of 17 Old 02-26-2006, 05:36 AM
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i like that Ghetto and fuctional...

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post #12 of 17 Old 02-28-2006, 03:06 PM
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Quote:
Originally Posted by poser
what are some good options for upgrading the MAF? and when would you do so?
after exhaust upgrade? after/befroe turbo upgrade?
if you get a stand alone ECU like a hydra you can remove the MAF entirely. Using a modified stock ECU though, you're stuck with it meaning nothing you do on the intake will make much difference
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post #13 of 17 Old 02-28-2006, 07:42 PM
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Originally Posted by mosc
if you get a stand alone ECU like a hydra you can remove the MAF entirely. Using a modified stock ECU though, you're stuck with it meaning nothing you do on the intake will make much difference
Not really.Any of the piggybacks or a Protuner/Street tuner can recalibrate the air flow signal when you go to a larger diameter intake.
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post #14 of 17 Old 03-01-2006, 02:32 PM
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Quote:
Originally Posted by dumdum
Do even know what a velocity stack is and what it does?They have only been using them for over 60 years on cars.In fact if you open your airbox and look inside the top half you will see a velocity stack right in front of the MAF housing/air inlet.A velocity stack actually speeds up the air as it is passed through it.A lot of aftermarket intakes and filters have these intergrated into them as well.By removing the silencer and opening up the inlet hole in the air box a pressure drop is created infront of the turbo allowing less resistance for the compressor wheel to spin.Shortning the intake tract length helps responce as well.The more bends/tighter bends cause more restriction,just like in exhaust systems.That 180 degree bend from the silencer elbow is nasty.And believe or not the silencer delete elbow's I.D. is slightly smaller than the stock elbow!There is comparison pics on other forums of the two elbows and i have measured it myself.Its roughly a 3/8" difference.The inverse effect would be adding a high flowing turboback exhaust that causes a pressure drop behind the turbine wheel alowing less restriction and faster spool up.
The only problem I see with that is that it feeds into the airbox. For a velocity stack to work correctly, the open end needs to be the widest point of the intake tract. That one feeds into the airbox, which is a higher volume than the stack, so any advantage gained by the stack would be counteracted by the air slowing down when it hits the airbox.

It may have the advantage of shortening and straightening the intake, but it won't function like a true velocity stack. Of course, on a forced induction engine you wouldn't notice the difference a true velocity stack creates anyways...
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post #15 of 17 Old 03-01-2006, 02:37 PM
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Quote:
Originally Posted by dumdum
Not really.Any of the piggybacks or a Protuner/Street tuner can recalibrate the air flow signal when you go to a larger diameter intake.
the problem is not that you cannot recalibrate things with a piggyback, it's that the flow through many aftermarket intakes are not as consistant as the flow through the stock one which the MAF and ECU are designed to work with. The irregular flow causes problems that the piggybacked ECU cannot deal with.

btw, that is completely just respouted cosmo wisdom.
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