David,
The gains are based on a percentage and usually around 5% for turbos as the original factory filter is too restrictive for the engine. The impact is less on an NA engine, which is around 1-3% improvement.

The link that you provided on the above test is done on a Supra, with a base HP of 280HP. A gain of 5% is around 14hp, which is about correct. If you put the same filter into a 110HP 1.6 engine, you will only see a gain of 1-3HPs.

This post has been edited by sleepwalker: Jul 6 2007, 09:10 AM

basically washable ones such as K&Ns last for a lifetime, as long as it doesnt tear or physically damaged....
as for HKS ones, they are not rewashable... u need to change the sponge once it gets dirty...

so, i would also recommend u to get washable ones such as K&N or Apexi....

i would suggest u to get branded testified air filters such as K&N, Apexi, HKS, Blitz and so on.... dun waste ur money on Monza, TypeR and so on...
as for heatshield and cold air intake... those u can diy install them as they doesnt require great engineering calculations and workmanship to achieve... understand how the air circulates around ur engine bay and how air flow works, u can do wonders with ur own hands...

U sure or not? FC won't be higher?

yes... FC wont be higher if u retune back ur AFR mixture....

if use drop in filter on kancil carb, there is a problem where the engine oil always leak up into the stock air box. Damaging the air filter most of the time. Anyway to prevent engine oil from flowing up to my kancil stock air box?

Actually it will, just that it is not dratic that you suddenly lose 50km on a full tank. If you do not have a piggyback to tune, it may not increase but the powerband is erratic. But with a piggyback, more air requires more fuel. Look at your piggyback settings and you will note they will more than always +1 or more in fuel. But like I said, it is not drastic.

My piggyback + all others that I've seen +fuel, rarely -fuel.

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Added on July 7, 2007, 9:30 am OEM filter inside airbox, cannot be seen, so no point looking nicer

This post has been edited by matthewctj: Jul 7 2007, 09:30 AM

of cos i am very sure. before i went into car modding, i heard all these stuffs, open port high FC, auto gear not suitable for straight flow exhaust, VS & grounding can increase power blah blah....the lesson i learnt, actually until u tried out all those mods urself dont draw conclusion as others told u. Now i understand all these stuffs only after i tried out myself.
Frankly speaking, u will only noticed higher FC after u bump up ur compression, change high cam, port polish & retune the ecu. Now my 1.8L RM70 only can go 250km.

but if automatic transmission, its better not to use open pod~~
My friend 1.5 Auto stock comes with it, former owner install, no pickup and drink a lot of fuel, power comes late.

Anyone install Drop-in??? Wat I wan is normal dirving...not high rev....now the low end power is really died.....2002 gti mah...ecu is siemen 1....the air filter...wira 1...wtf...

Open pod will cause high FC? I use my FC improved wor...no bullshit

mine dropped a lil bit during rainy days .... haha ... but then someone explained it back in one thread sometime back .lol

For those whose FC get higher with Open pod, how much difference wud it be? how much lost per full tank?

its engine oil or fuel that leaked to the airbox??... did ur engine jerk whenever u switch off ur engine??.... if yes, ur ignition timing too advance adi....
what happened is the ignition switched off and ur engine is still pumping in fuel... the fuel floods the combustion chamber (coz no spark to ignite it)... it overflows and pushes back upwards towards ur TB, thus leaking into ur airbox and damaging ur air filter....
get ur engine tuned... there shouldnt be any problem....

haha... agree agree
my car fc improves after changing to open-pod air filter.....

With both from k&n, same manufacturer but drop in not so efficient...I noticed reaching higher speed in shorter time and better response with open-pod.

maybe not recommended for underpowered auto cars....

On my experience on installing the drop in into my myvi (blitz sus air filter) does makes an improvement to my car, with better throttle response at lower rpm due to improvement (although minor) to the torque.

Unless if u really want to improve low end power, i suggest u go for an extractor change rather than air filter. 4-2-1 extractor will definery improve the low-mid range power.