K&n Style Air Filter

[BAV1]

Hi guys

just a quick recently i had to replace the 90 degree elbow that goes into the turbo as it was badly split however with the split seem to come a bit of extra performance and better fuel economy ???

which i would like back so im thinking of replacing the stock airbox with a K&N style filter can anyone forsee any problems doing this or has anyonbe done this would be interested as always for your feedback (and what you used with pics if poss)

p.s if any one ones needs a decent garage in the bury/manchester area let me know finally found one a bit closer than stevo at engine co (sorry mate but a bit out of the way)

thanks guys

[BUSHWHACKER]

It has been done before, but the intake roar soon becomes tiring and many have reverted back to the stock filter/housing.

[BAV1]

cheers mate i know they can produce roar is there anyway of increasing airflow without the roar and does it increase power as since replacing the hose i have noticed less power a big difference in fuel economy was great with the split but obviously at high risk leaving that hose spilt so crap can get draged into the turbo what affect on the sensor will adding this type of filter have

cheers

[BUSHWHACKER]

The sensor shouldn't be affected as it monitors air temperature.
I have seen some 2.4 engines with a cone type filter fitted directly to the turbo, so the sensor can't be that important.

[BAV1]

i did think of that but if i remeber rightly there are some smaller pipes running off this inlet maybe wrong

any ideas on achieving the same results without to much roar

cheers jon

[BUSHWHACKER]

You have a 2.4 right?
There's 3 rubber pipes that connect onto the stock intake tube that lays accross the top of the engine, the larger one comes from the valve cover as it's a sealed intake system, which means the crankcase pressure is redirected back into the inlet tract. If you fit a filter directly to the turbo then you'll also need a small breather filter or oil catch can plumbed into the outlet on the valve cover.

The other two small diameter pipes are vacuum pipes for the A.D.D. system, they join together via a steel tube fixed to the side of the silver intake tube on top of the engine. Again, if you bin the stock intake ducting, you'll need to joint these two small pipes together otherwise the front diff won't engage when you select 4WD.

Alternatively, get a K&N filter thats the same size as the stock one.

[BAV1]

just replacing the stock air filter sounds the easiest way to go but dont want to much road any ideas whic to go for either the single cone or double cone that is sort of hollow in the middle im assuming the double cone will allow a higher throughput but will be louder any ideas

cheers

[BUSHWHACKER]

The more flow the better.
It'll be in the filter housing anyway so it shouldn't be any noisier than the standard filter.

[BAV1]

sorry to sound thick but was thinking of disconnecting the air filter and box and replacing with a cone filter like in the attached image shouldnt be any technical problems just dont want it to sound to much like a suped up corsa but yeah i agree the more flow the better do you agree that this should improve fuel economy and power

[BUSHWHACKER]

All you'll gain from using one of those is a lot of noise like you just described.
That filter will be sucking in hot air from the engine bay which will lessen performance and use more diesel.

There's a K&N filter available thats a direct replacement for the stock filter, it's more free flowing and it'll be drawing in cooler air from the front of the truck, just behind the passenger side headlight. Cooler intake air will improve performance, an increase in mpg is marginal though.

[BAV1]

glad you know what your talking about

only problem is that my truck doesnt have a pipe that runs all the way to the front of the truck prev ownwer has added a section of pipe about 6 inches long with holes drilled into it but i have been thinking of ways of getting coller air back

with the split turbo inlet it was i assume sucking in hot air but made a major difference to both power and fuel usage (posative difference that is)

the more questions i ask the more i fing need answering suppose the only way is to suck and see with cheap cone filter???

any idea how much the filter that goes in the airbox would cost and where i can get one

cheers again

[BUSHWHACKER]

A turbo without any ducting leading to it will spool up quicker and deliver boost faster, thats why those tuners in their Supras and Skylines etc bolt cone filters directly to the turbos, but they also have CAIs (cold air induction) kits fitted.

All that ducting in standard turbo cars petrol or diesel, creates pressure waves/pulses which slows down the incoming air to the turbo for better economy but sacrificing performance. Manufacturers develope a 'happy medium' in production vehicles.

Fitting a free flowing filter to a standard car will help it breathe better.

No idea how much or where from though, but K&Ns aren't cheap.

[BAV1]

cheers mate sounds like a little more research is needed before i dive in thanks for your input its much appriciated

[hiroler]

Just get the standard piping off a breaker on here. then fit a direct replacement K&N does anyone know where to get one from? and what model number will be required for a 2.4?

[biosurf]

Is it the same as the 3 litre? If so I have the pipe which goes to behind the headlamp.

BAV1 you can have it if you like. No cash my way needed but you could make a small donation to the forum if you wish.