Could this be hit with a sticky? Please......

Air Filter Testing

Its quite a good review and read!

Should prove a hit with the daily "filter" questions..........

What daily "filter" questions :confused:

I'm very sceptical that a cone filter will give the stated increases to bhp

A car manufacturer will fit the filter that gives the best all round performance.

The filtration of each hasn't been tested in those though. A more restrictive filter will be better for the engine as it'll stop more particles entering it, but it'll not produce as much power as one that flows more air (and dust etc).

the apexi one is the proven best bhp on turbo cars as it does not get so much heat soak as the others, darren

review was by R. BATTY???

lol

thats quite good read.

They should have done a run without a filter. just a nice big open end

just a nice big open end

we'll have none of that thank you:rofl:

LMAO!

Big open end then.... ?!!?

Sorry but having used most of the filters in the test, I would say that the results have been about right on each one. Many hours of mine spent on rolling road sessions has made my mind up about these types of filters and bhp results seen. This test best sums it up.

Also I once ran a car with just a set of the girlfiriends tights over the hole, and the sound was fantastic, and the car sounded great too!....

Having noted that the tests were done on a Mitso FTO MIVEC, so base power is ~200bhp, and even the HKS unit is only offering ~4.5%, I can believe those figures.

Bobob; standard airboxes are designed to silence intake noise, and to be cheap; not to be good!

Irf, clearly their complete inability to filter is why US Baja and NASCAR racers use K&N filters.

Tuning the LET - Intake

and

Browser Warning

Interesting reads on why not to fit K&N type and aftermarket filters

edit: no idea why the link says 'Browser Warning' there is no problem with this link

The first link is at odds with flowbench testing of just the filters (so no question of significant variations in air temperature) done when K&N and Pipercross were new to the UK market. That said, it does confirm my view that foam filters are preferable to cotton gause ones.

The second link I've seen part of before, and the only place it makes sense is when they talk about the standard airbox being a silencer. They then rather spoil that by talking about gains from ramcharging. Ramcharging is worth maybe 3% at 200mph (Source being more or less anyone in F1 or MotoGP who's prepared to talk about the subject), so forgive me if I think they don't really know what they're talking about, esp since a turbo actively sucks air down the intake duct rather than just blowing it out the HP side.