Single Turbo Filter Advice

[gsb876]

The HKS ones are decent for the single tubby

[G@NDY]

Oh dear !!!!!! I ended up getting a greddy one, as they were good value i thought. Might have to ask the place i got it from about the flow rate thing. Another mistake by me,,,,,,,,,, DOH :rolleyes:

[banned advertiser]

K&N are mailing me a chart with bhp figures against filter size.
As soon as I get it you will get it.
Please remember (cant take for other manufacturers) bhp figures from K&N are for N/A cars, to work out turbo bhp/filter figures add 80% so you only need a 250bhp filter to use on an 450 bhp turbo car.

[Mave]

K&N are mailing me a chart with bhp figures against filter size.
As soon as I get it you will get it.
Please remember (cant take for other manufacturers) bhp figures from K&N are for N/A cars, to work out turbo bhp/filter figures add 80% so you only need a 250bhp filter to use on an 450 bhp turbo car.

?? I didn\'t think it made any difference whether a car is N/A or turbo\'d, you still need the same amount of air going through the filter??

[banned advertiser]

A turbo will draw far more air than N/A its forced induction.
The percentage Im quoting from K&N

[Mave]

A turbo will draw far more air than N/A its forced induction.
The percentage Im quoting from K&N

OK, I\'m sure K&N know what they\'re talking about better than me, I just don\'t understand it. A turbo making 250 bhp draws the same amount of air as an N/A making 250 bhp as the air fuel ratio is the same, isn\'t it?

[banned advertiser]

Its a bit like a hose pipe that draws x amount of water to wash your car, then someone bolts on a jet washer and the same hose uses more water.

The car uses the same amount of air, but can get that air through a smaller filter because its being forced.

[Mave]

Its a bit like a hose pipe that draws x amount of water to wash your car, then someone bolts on a jet washer and the same hose uses more water.

Right, so if you are using more water (or air) then you need a bigger filter? The only thing a turbo does is allow you to get away with a physically smaller engine. The air fuel ratio is fixed, and power is pretty much proportional to how much fuel you burn, so the relationship between air flow and power is pretty much constant.

The car uses the same amount of air, but can get that air through a smaller filter because its being forced.

Ah, but this is where I\'m confused. The air isn\'t being forced through at the filter, its upstream of the turbo! The only thing that pulls the air through is the suction from the engine, and the only thing which causes the suction is the flow through the engine, which is proportional to power; so the suction level downstream of the filter should be the same whether its N/A or turbo. I think ?? I know I must be missing something as K&N are not exactly cowboys, but I don\'t get what it is  :Hammer

[TRex]

but I don\'t get what it is  :Hammer

 A bit like Aviation topics, you certainly don\'t get that either!  

[banned advertiser]

Last night up loaded approx 450 different universal K&N filters, all tapered are priced and working on straight, finish them today.
http://www.rotaryart.uk.com/acatalog/K_N_Filters.html

[dre]

Gman - try gotham racing. They do a nice universal Blitz filter for $67. I will be getting one of these for mine. Have a K&N on mine at the moment but it is far too restrictive for the power my car will be putting out.

check out the link below  :Typing

http://www.gothamracing.com/catalog/product_info.php?cPath=100_443_107_115_194&products_id=771

 :burnout

[Mave]

A bit like Aviation topics, you certainly don\'t get that either!  

That\'s a bit of a confrontational comment  :2Rolleyes All I\'m trying to do is understand things, and I accept that sometimes I\'m wrong, but that doesn\'t stop me wanting to understand. I assume that you are referring to a thread where you never bothered to reply to some of the specific questions I asked, only using irrelevant examples to demonstrate your opinion. If you understand why a turbocharged car needs a smaller filter than an N/A car of the same power, I\'d be more than happy to listen to your explanation.  :3Confused

[banned advertiser]

Listern to the induction on a turbo car and you can hear it sucking in the air, a n/a car does not have the blades on a turbo spinning round drawing air in.

[Mave]

I was actually thinking about this at dinner time (before TRex annoyed me by poking me with sticks  ), I agree that the turbo is drawing air in, but... the fact that you can hear the sucking more than an N/A car means that the air speed in the intake is higher, which means that the losses are higher. An N/A car will make the same sucking noise if you put a smaller intake system in, pistons are just as capable of drawing air as a turbocharger.

I suspect that on a turbo installation, you don\'t need to be as careful about inlet losses as the manifold pressure is set by the turbo wastegate (so more losses just mean that the turbo works a bit harder), whereas on an N/A car the manifold pressure is set by the intake losses.