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Alfa High Performance Co.Ltd.
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| Air Filters: |
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The simplest modification requiring next to no skill and with minimal cost is to replace the air filter element with a performance air filter. K&N (from the US) are by far the biggest name in the performance air filter market both worldwide. the K&N filter element is a cotton gauze material. It can be sprayed with oil to attract and trap dust and the benefit of both is that air flows more easily through them than through a standard paper OE filter, thus releasing up to 2-3bhp. An additional benefit of performance filters is that they can be cleaned, re-oiled and used again, so you never have to buy a replacement element again! |
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All air filter manufacturers make statements about their filters producing more air flow etc. but what really happens is that the performance filter produces a smaller pressure dropat a given engine speed than a standard filter. This means the engine sucks in air more efficiently and therefore the engine is more efficient. More efficient = more power. |
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For fuel injected cars the next step up (and more popular) is to install an induction kit. These require a little more skill but nothing more than a screw driver and small spanner. An induction kit is a cone filter placed as close to the air inlet of the engine as possible. In most cases you remove the original air box which houses the standard air filter as well as the hoses and any resonator boxes which connected it to the air inlet. The cone filter is then usually attached directly onto the air flow meter which is usually mounted directly onto the inlet manifold. With the removal of all pipework and shortening of the air path, this means that pressure losses are minimized hence power can be increased. However, the key to good power gains from an induction kit is how much cold air you can get to it. The colder the air then the denser it is and the more dense it is then the more mass of air you are getting into the engine. The ECU then matches the fuel input with this increased mass of air and more power is produced. So the message is : get as much cold air to the cone filter as possible and where necessary put in heat shielding of your own - we sell a range of Thermo Tec products to help with this. As with replacement filters, there is the same choice of cotton gauze or foam filtering elements. Again the choices are K&N, Green Filters, BMC Filters or Jetex for cotton gauze filters and Pipercross, Ramair or ITG for foam filters. Prices of induction kits of any brand range from approx. 100$ -250$ and power increases are typically around 4-5 bhp. Some applications such as the Civic Type R are reputed to give 15 bhp! |
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These are for cars with a carburetor rather than fuel injection. The original air box containing the OE filter is removed along with any associated pipe work and the new filter simply bolts directly onto the carburetor. Again the advantage is a smaller pressure drop for the incoming air and hence more power. In some instances the carburetor will need to be rejetted so that the air-fuel ratio is still at the magical 14.7. We sell bolt-on kits from K&N. |
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