K&N or BMC air filter? which one has better effect on POLO GTI?

[saba]

does any1 know were in perth we can get a BMC Filter?

[GTI POLO]

I dont know if you can notice the difference between each filter..

On my XR6T (before I sold it), I made 276rwkw with a paper filter. So how restrictive could they be? I didnt dyno it before and after but the paper filter was good enough for 276rwkw.. I later made 320rwkw but that was with a K&N and more mods..

I reckon the K&N or BMC is better but its probably like saying I run the 1 hundred metre sprint in 9.97 seconds instead of 9.99.. stuff all difference..

In saying that Ive got one in my car.. and Im happy with it.

[Giallorosso]

What part number is the BMC filter for the Polo GTI?

[GTI POLO]

I left the box at the workshop.. Part number dont know...

It was a bit of a squeeze getting it in though..

In another thread, someone did an air pressure test in different parts of the intake.. theuy concluded that the seat intake was the big winner and there wasnt too much in the filter..

[pologti18t]

I dont know if you can notice the difference between each filter..

They make diddly-squat of nothing difference. The pressure drop over the airfilter is insignificant (and it has been measured) compared to all the other restrictions in the intake/exhaust components.

Stick with paper filters as they do filter better than oiled foam filters.

go read this...

http://www.autospeed.com/cms/article.html?&A=0646

Hmm, so how much loss is there through the filter? Very nearly nothing at all! And guess what? That is the case on nearly every car - the standard filter poses very little restriction at all in the system. Look at the Before Filter and After Filter lines - don't get much closer than that, do ya? In the Audi's case, the filter makes up 1 inch of water pressure drop out of the 32 inches total pressure drop that is present. In other words, 97 per cent of the flow restriction of the intake is not the filter. And to hammer home the point, when you make actual on-car measurements, it's pretty well always like this. The airfilter as a halitosis-suffering, smelly, dirty, hairy negative pressure is a total frame-up created by those with vested interests in selling drop-in aftermarket replacement filters.

[RhysQ]

They make diddly-squat of nothing difference. The pressure drop over the airfilter is insignificant (and it has been measured) compared to all the other restrictions in the intake/exhaust components.

Stick with paper filters as they do filter better than oiled foam filters.

go read this...

http://www.autospeed.com/cms/article.html?&A=0646

then why when you drop an aftermarket filter in a turbo car does the turbo whistle and BOV noise significantly increase, that can't just be co-incidence. its a prime result of increased air flow. also, a lot find that the aftermarket filter makes the car more responsive.

i'd doubt very much it does 'didly squat' for forced induction engines. i agree that it would make little difference in performance and i know that they do very little at all for N/A cars (which is maybe what that review is in regards to), but it is a great way to increase much needed air flow for anything forced induction.

[pologti18t]

then why when you drop an aftermarket filter in a turbo car does the turbo whistle and BOV noise significantly increase, that can't just be co-incidence. its a prime result of increased air flow. also, a lot find that the aftermarket filter makes the car more responsive.

i'd doubt very much it does 'didly squat' for forced induction engines. i agree that it would make little difference in performance and i know that they do very little at all for N/A cars (which is maybe what that review is in regards to), but it is a great way to increase much needed air flow for anything forced induction.

You contradict yourself

This is imperical evidence vs "what i feel". I will take imperical evidence

If it really did make a difference then you would expect to find one of these aftermarket filters in a Nissan GTR as standard

The car in the article was an Audi turbo.

[RhysQ]

You contradict yourself

where??

and, i doubt the nissan GTR will be using a mass produced paper filter that is shared with other models.

apparently every GTR is hand built, i'm sure they'll have a pretty tech intake system with hi-flow filters.

finally, i'll take reliable word of mouth (i.e. members of this forum) over writing on paper anyday. but thats just me.

[wangsha17]

Actually I can feel differenct, because I add every mod one by one, After I chiped my car from APR, I feel it became a different car. then I add engine mount, it became a lot firmer. Then I add SEAT AIr intake, I feel engine more respones and bigger noise for suck air.. 2 days ago i added BMC filter, the noise of sucking air is bigger and more effective respone, it really makes difference by adding every small mod..

[pologti18t]

i'd doubt very much it does 'didly squat' for forced induction engines. i agree that it would make little difference in performance and i know that they do very little at all for N/A cars (which is maybe what that review is in regards to), but it is a great way to increase much needed air flow for anything forced induction.

Well, if it did increase airflow it would make a difference to performance.

The article I showed you cleary proves that the airfilter is an insignificant restriction in the entire inlet side of the engine. a 20% improvement on insignificant is still insignificant.

GTR airfilters (look pretty normal to me)

[shaneth]

Guys sometimes its just not worth argueing about this kinda stuff. Obviously pologti18t has his opinion (whether it right or wrong) and thats all there is to it. And you have yours. So just agree to disagree and call it a day.

I put a K&N in and felt a slight difference.

[Grant]

i immediately felt a difference with K&N. much less 'jerk' when lifting off throttle

[GTI POLO]

Dont know about what the difference is but it has to be better than standard..

Each of us has to assess whether its worth the $$ to get one..

there must be a benefit but how significant is it??

I personally didnt notice much with the BMC filter..

On a 320rwkw XR6T someone reported getting a 1rwkw benefit.. so on a 130rwkw car like our APR Polos, not sure how many benefit it will be..

[Grant]

Dont know about what the difference is but it has to be better than standard..

Each of us has to assess whether its worth the $$ to get one..

there must be a benefit but how significant is it??

I personally didnt notice much with the BMC filter..

On a 320rwkw XR6T someone reported getting a 1rwkw benefit.. so on a 130rwkw car like our APR Polos, not sure how many benefit it will be..

but remember its not always about peak power. the most common quoted changes by polo gti owners are:
better throttle response,
more induction noise, and
less jerk on throttle lift off.

i experienced all 3 and they all point to a less restrictive induction system.

[wangsha17]

yes

but remember its not always about peak power. the most common quoted changes by polo gti owners are:
better throttle response,
more induction noise, and
less jerk on throttle lift off.

i experienced all 3 and they all point to a less restrictive induction system.

Yes, I totally agree with your statement man. I have felt those three differences which are quite significant