Silvia Club of NSW

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PostPosted: Fri Feb 22, 2002 4:51 pm 
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Quad T66
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Joined: Sat Feb 02, 2002 11:00 am
Posts: 2753
Location: Blue Mounains, Sydney
Car: Cefiro coming
Typically, changing from stock to aftermarket filter would maybe net
a handful of kilowatts, right? A small difference, maybe noticable.
In Hot 4's, Martin Donnon points out that a cheap paper filter may in
fact lose 20% of available power.

I'm led to believe by a number of things that my Silvia was complied
with cut price strategy. A cheapo filter is probably in my airbox.
Whether it is restricting the engine by 20% is debatable, but I am
now led to believe that if I install an aftermarket filter, I will
pick up the difference between factory and current state, plus the
usual small gain to aftermarket. This would probably add up to a
noticable gain altogether.

I know SR20 Q's are no rocketships, but the car mostly runs 0-100km/h
times in the mid 9s to 10s bracket. It has a full 2 1/2 inch Apexi
exhaust with sexy 4 into 1 headers as well. Factory quoted mid 8s to
100km/h, which I know can be optimistic, but surely with the exhaust
the car should now come close to this time. I have experimented with
many different shift points and launch techniques, but the times
don't vary much.

The car also feels a bit strained throughout the rev range.

My plan is to combine the high flowing properties of a pod filter
with the cold air induction of an air box. I want to install a pod
where the airbox is, but make a new custom larger airbox to house it
in. I will run a larger cross sectional area pipe to the factory
pickup spot to minimise dirt and water. Heatshieding one side of the
airbox should help temperatures further. What do people think of
this??? Maybe the box could be clear to still see the pod...

An additional idea is to install a small but powerful fan in the
piping to the airbox to suck in air at low speeds and possibly
pressurise the airbox. My main concern with this is that the fan will
become a restriction at higher speeds.

Can anyone please shed some light on my ideas. Am I hopelessly wrong,
or is it an interesting and promising idea???

Michael

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PostPosted: Fri Feb 22, 2002 7:17 pm 
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Takumi
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Joined: Fri Feb 01, 2002 11:00 am
Posts: 4779
Location: building!
Car: Silvia
I was planning on doing exactly the same thing.
When I get a chance I'm going to run a scoop from the bumper through the intercooler piping hole into the bottom of the factory airbox and then put a decent aftermarket filter in it. I didn't really want to put a pod on it because you then lose all the resonators, etc that are there to tune the intake for mid range torque.
I was working out what's needed in the fan department and pretty much decided that to get any decent airflow benefits it's going to be a pretty expensive custom fan.
Engines suck a hell of a lot of air, especially if you want it pressurised.
It may be possible to get some gains at low revs, but you'd probably need to have a valve system to let the engine suck air in unrestricted at higher speeds. The problem is that larger fans tend not to produce any real pressure, and small ones can't keep up with the flow rate.

You may want to check your timing too, as it may have been retarded a little to compensate for our dodgy fuel.
Also, check your cat, it may be a bit clogged, especially if bits of gasket got sent into it after installing the extractors.
Mine always felt a bit strained at high revs till I did the extractors. Now it winds out and hits the rev limiter like a brick wall :>

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<font size=-1>[ This Message was edited by: DumHed on 2002-02-22 16:20 ]</font>


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PostPosted: Sat Feb 23, 2002 2:43 am 
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Admin Team
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Joined: Thu Jan 24, 2002 11:00 am
Posts: 1089
Location: SilviaNSW
Car: 1988 S13 CA18DE now SR20DET
I myself had stock airbox with crappy filter, I changed it to a Kand N pod that I had lying around my house and my car certainly gained enough power to make a considerable difference, I was a happy man THEN the coppas decide to put me through EPA testing and my pod filter failed (as any pod will) UNLESS you have had your car engineered with a pod filter it is illegal! I had to put standard airbox back on to get rid of defect, I put a new filter in it (soon will change to high performance) And a hole in the bottom of the airbox for cold air induction!
Peformance filters are cheap, well cheaper than a pod anyway!
If anybody says a rediculous price to you for good filter for your car ask them how much the same filter would be for a v6 commodore and see if there is a difference, if so get commodore filter as commodore and silvia s13/180sx have exactly the same airbox, the reason I know this is, I used to sell air, oil and fuel filters for a major manafactuer of automotive filters!
The reason pod filters are illegal is that it sucks more air, there for, the injectors pump more fuel, therefor emmissions change!
BLOODY BASTARDS THEY ARE! :razz:


<font size=-1>[ This Message was edited by: snezy on 2002-02-22 23:45 ]</font>


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PostPosted: Sun Feb 24, 2002 2:23 am 
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T25
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Joined: Thu Jan 31, 2002 11:00 am
Posts: 12
I thought the main prob the authorities have with 'exposed' air filters was the back fire danger! A real risk on carby fed cars, with the filter (usually paper) mounted right on top of the carby. On an injected car, its not really a problem. But it seems that the laws/rules/ADRs work against newer cars, while making it easier for some old shitbox to belch out filth all day while sucking to 10L to the Km.

As for the S13 filters, same applies for N14 Pulsars, Z32 300ZX, most Skylines...your dealing with the humble A360. Any good stockist should be ablt to put you onto a K&N or O2Rush equivilant.


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PostPosted: Mon Feb 25, 2002 7:23 pm 
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T28 Hybrid

Joined: Fri Feb 01, 2002 11:00 am
Posts: 68
Location: Stanhope Gardens
The main reason why a pod filter is illegal is due to noise emmissions; it is technically called an 'unsilenced air filter' and if you ever take the time to listen to an engine revving near the redline with a pod filter, you'll certainly notice the louder induction roar which a conventional airbox is designed to restrict.

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