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What To Do Wit Air Filter

Taso84

By Taso84,
in Engines & Forced Induction

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Taso84 Mentor

Taso84

Posted
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Need to either clean or replace my air filter, atm i got a HKS mushroom one on that is really dirty, but i heard it isnt too good and i should jus scrap it and buy a new apexi style one.

Wat do u guys reckon, should i jus clean the mushroom one or buy a new apexi style one.

P.S. is there any difference b/w buying a real apexi or a fake $40 one that they sell at autobahn?

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Taso84 Mentor

Taso84

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I have a hks musroom too, it was filthy. It went all crumbly when I took it out. Just replace it, costs $50 from justjap, genuine HKS too.

This is wat i am afraid of,

Should i get a real apexi one or just a $40 copy if i decide to replace it?

GTRgeoff Grand Master

GTRgeoff

Posted
Posted

Just use an Apexi panel and get the stock airbox back on unless you need to run huge power. My GTR runs the same size panel as the GTSt's with 260rwkw so decent power is not a problem, it just has more air inlets to the box and that can be corrected with a with of imagination and cutting and ducting. Plus you can then run a decent front mount without defect.

Blitz Grand Master

Blitz

Posted
Posted

Why would you clean an HKS filter element? They are a single use throw away item.

Purchase a new element for it as mentioned above, cost is around $50, and you then have a brand new filter.

Just Jap has them on their website

MANWHORE Grand Master

MANWHORE

Posted
Posted

One thing you will notice though is that the hks pod makes a lot more noise than the apexi. Therefore, theoretically, it should flow more.

However, this would be at mega power levels. At stockish power levels, any extra flow won't give more power.

On a 1000kw car, it probably would.

GTRgeoff Grand Master

GTRgeoff

Posted
Posted
One thing you will notice though is that the hks pod makes a lot more noise than the apexi. Therefore, theoretically, it should flow more.

However, this would be at mega power levels. At stockish power levels, any extra flow won't give more power.

On a 1000kw car, it probably would.

Completely wrong.

Just because it makes more noise doesn't mean it flows more. It could be increased turbulence causing the noise, or greater restriction, ie blow a certain mass(at the same temperature) of air through 2 vastly different sized orifices in the same amount of time....the smaller orifice makes much more noise due to increased turbulence and restriction so more effort or pressure is required to do the same job resulting in a less efficient delivery. Equate this to the smaller filtering surface area and the turbo dragging the air through. Also in terms of sound pressures, if noise is coming out that is causing a negative pressure wave in the intake. Bottom line, HKS filters are complete junk. There was a HKS panel in my GTR and the amount of sediment lying in the bottom of my airbox after the filter was worrying.

Correct that stock power levels would be around the same but better flow means better response. The important thing though is clean air and HKS clearly fails that criteria from both my personal experience and others' testing.

What the testing shows is the boost produced by the car with each filter, of which the Apexi and then Blitz were the best (highest) with SARD and HKS the worst, and the filtering ability for the medium used for which the Apexi performed best and the HKS about the worst. I have another similar study on my other computer that I'll post if I remember.

GTRgeoff Grand Master

GTRgeoff

Posted
Posted

I don't like them because they are oiled, so can introduce oil onto the AFM element and they don't clean very well. They also state they are for race only therefore call doubts about legality for road use.

Read the above I have posted. Will your non turbo GTS-4 be pulling more power than my GTR? Stick with the stock (but modified for extra air inlets) airbox and use an Apexi filter panel and protect your engine. Would you use really crap oil in the engine? Why introduce dust that will increase wear more than some oils?

Sure it doesn't look as cool, but if you wanted to be cool you'd have a GTR or RZ Supra or late model RX-7 :(

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