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Filter material

Peter, don't misunderstand me...I'm certainly not quibbling over the small cost of the HKS stuff, merely making comparisons, since it seems that "particle size" is an issue. I'm no scientist, but I'm sure this material is a finer mesh than the hks but because the fibres are so fine they MIGHT allow greater air-flow. I can send you a sample to examine if you like.

Perhaps a very slight impregnation with chain-saw oil ( which is light but very sticky) might assist the material in capturing air-borne muck. Then just dispose of them every 500 miles and pop new ones in.

John
 

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Discussion Starter #44 (Edited)
John,

I wasn't saying you were quibbling over money,
just all the engineering, durability and testing work
has been done for you by HKS/Apexi/K&N.

I'd also be concerned about fibres being sucked out
of that filter material and being injested.

I'd play safe after all its a very expensive engine.:(
 

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Scott....

Just got myself a pair of Apexi's....spent a whole day polishing up the elbows ( using elbow grease...of course! ) and fitted them this morning. Very nice! :D



Thanks for the tech. info

john
 

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Discussion Starter #47
Nice one John.

Could you post a piccy if you have one.

Never seen the Apex'i filters fitted.

I bet your engine doesn't know whats hit it.
One moment swallowing dust, grit and fibres,
Now nothing other than pure air.:D
 

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The Apexi Twins

Well Scott,
After a BIT of a struggle I got them in.
The diagram and instructions (in Japanese) didn't make sense, and out of the four brackets I used two which had to be modified to make a proper fit ( bent..in other words!)

Added one extra bracket which I made myself just to make everything tight.
 

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Dirk,

I havn't been out with anybody in a 34.

It's just that they are a heavier car and I figured they would need a lot more horses to tug 'em along.

How many in your herd?

john
 

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Scott said:
John,

I wasn't saying you were quibbling over money,
just all the engineering, durability and testing work
has been done for you by HKS/Apexi/K&N.

I'd also be concerned about fibres being sucked out
of that filter material and being injested.

I'd play safe after all its a very expensive engine.:(
IMO the reason I had to rebuild my 32K mile old R33 GTR engine prior to sale was the HKS "filters" didn't! The text book signs of poor filtration were all there, eroded compressor blades on both turbos, excess bore, piston and ring wear, and excess valve guide wear. i just CANNOT undersatnd what peoples obsession is with removing the stock air box. Nissan designed it well, it's no real restriction, it's quiet and pulls cool air from outside the engine bay and the stock pleated paper element is a superb filter.

I have it on top authority that in Oz the feeling that top tuners have for the HKS filters is unprintable :)

I would say leave it stock, maybe mod the filter box to pull a bi more air, leave these aftermarket things WELL ALONE. They provide good margins, simple hassle free fitting and a hard product to condemn until it's too late for their vendors, in other words tuning shops love them, but maybe the end user doesn't get all the facts?
 

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Discussion Starter #56 (Edited)
Thanks Chris,
My point entirly. You make a mod, unknowingly down
grading the filteration performance of your filter, all for an extra 5 bhp!

These after market companys have got it sorted. They have the majority
of the car loving world ignoring filteration, (as if it some stupid waste of time
invented by car companys to deliberatly restrict the breathing of their cars),
all in the search for VERY SMALL bhp gains. But at what cost. :confused:

The a few years down the line, like Chris here, you need a 4-5k rebuild.

Hope the 5 bhp was worth it guys.:(

Beleive me, If you do want a 'Performance Filter' fit the best you can:
See begining of thread and study the performance comparison chart.
Why do you think the standard filter is 99+% efficent??????
 

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Hi Scott, do you think the HKS metal flow pod filters are any good?. They look simular to the Blitz metal flow items. But are supposed to have better filtering properties.

I would like to keep the standard airbox on, but cant due to space, with the turbo kit I've gone for.

Jason.
 

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Discussion Starter #58 (Edited)
If your care about the filteration, go for the Apexi kit. At a push the K&N (M's)
or any oiled cotton filter of decent brand. Then run the risk of possible oil
contamination to the air flow meter which isn't a problem unless the filter is
dripping with oil but is repairable. We only use 2-5g of oil per filter.
So mind how you go when re-oiling.

I'd expect ANY mesh filter to be as useless as foam!

Sorry Blitz/HKS users, I just called it, like I see it.:)
 

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K&N

Any comments re the cleaning and oiling. Too much oil and it fouls up the air flow meters and too little and not enough filtration I presume. Does regular cleaning help or hinder?
 

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Discussion Starter #60
Hinder!!!!!!!!!!

Like all filters the need some dirt on them, it blocks all the bigger holes in the material.
Thats why if you look at the chart on page 1, and you see the efficency go up on all filters.

K&N say 100,000 miles between servise. Mine have done 20k and look quite cruddy and
all black. I'll give them another 10 before cleaning them.

Remember to spray the oil evenly and LIGHTLY. Don't drench them.;)
 
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