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

[Blitzen]

hey blitzen, how's it goin?

apparently, the pumpe duse engine was really just developed in order to test common rail engine/ injection pressures (if i recall correctly).

as such, its been rumored that there are a few components on the cars that werent designed with ultimate longevity as a priority. in the pumpe duse diesels, the exhaust gas recirculation motor/flap and intake manifold clogging seem to be issues when on the other side of 100,000kms. when north of 200,000km's, early cam lobe wear (documented abit with north american 1.9 tdi pd cars) seems to be an issue also.

with the air filter, many tdi'ers will argue that k&n or bmc will have less filter element when laid out on the floor, than a stock paper filter will, and they'd attest that filters with less filter element than stock, will not be able to filter as well as stock paper, and in turn will contribute to this lobe degradation.

lucky bastards over there have group buys/ makes for lumpier, sturdier cams though.

[p.s. once again im just regurgitating diesel-specific stuff i've read over the last couple years]

I'm going well...Still overseas fixing other peoples screw ups!!

In regards to the engine, I just don't see how what air filter you use will impact on cam lobe wear, considering that the 2 areas (air intake and cam shafts) are completly separate and sealed from one another.
I think the issue that these engines are having above 200k km is that the Case Hardening is wearing off the lobes of the cam, contributing to higher cam wear. Any engine will do this over time, but there are so many factors that would contribute to this, and I think what air filter you use has little or no bearing on it.
The filter that would have a massive bearing on cam lobe wear is the oil filter, not the air filter.

[Buller_Scott]

its a very interesting thing to read/ be involved in. i too think there would be many factors, but i've read enough to keep the stock paper filter in place, personally.

either way, and despite not be too good with between-service self-done oil changes, imma keep my little oiler for a good few years yet (regardless of cost, and because apparently vw/audi is going to phase out good ole manual in favor of dsg, apparently? plus, my car doesnt have a diesel particulate filter, which hampers mods).

i'd love to give a higher-flow kn or bmc filter a go- i reckon it'd be sweet. hell, the difference just the seat intake made was worth it. but im sticking to my guns on two things over time (in this forum): oem paper filter, and upgraded smic as opposed to fmic.

i just enjoy the idea of being able to present a different angle with what little i have. and no, cogdoc, im not referring to my fruit.

[Dub_Star_V6]

As if any further evidence was required...

[woosh73]

I did upgrade to the bmc filter from OEM . Just a personal choice as i can clean my bmc more times so the car runs better.
I paid $110 from autobarn , i don't think there's a huge difference between K &n and bmc as i used the k&n on the rexy.

$90 is pretty cheap , you should ask the guy who owns the franchise to set up a mail order system.

[DeanB]

The K&N or BMC may not make an ounce of difference wrt performance, but the slightly louder induction noise is a bonus without having to go to a pod filter (illegal) or taking a hacksaw and drill to the intake box (looks messy) to make it louder.

Horses for courses the filter debate, for $100 you aren't going to get some amazing performance enhancement !

[noone]

Read a few articles, cant say I know for sure what the answer is.

I completely believe that a sports air filter may make 0 difference, but without testing on every car, you just don't know.

I'd like to see someone come up with a better intake mounting option behind the grill. After the little flap is cut away (as per Shaneth's DIY guide), the mounting point sits too far from the front grill IMO. Its tucked up a little high, so I don't think its going to get the ram air intake effect.

unfortunately when I had a look today, the top of the radiator is a little in the way as is the back of the front bumper section or the front part of the engine bay... I was just thinking of a chopped funnel and wide pipe, nothing too fancy.

When I installed the Forge TIP recently, I had a look in the air filter box. there was NOTHING in there, even though I'd chopped out the little flap completely.

[GuyGTi]

Ive got a BMC CDA and I love it. Induction noise is great, throttle respond and lift of is good. I only paid £75 for it which is mega cheap. I wouldn't pay the RRP for it though. In my opinion it's not worth it.

[mikepologti]

as above i didnt pay full price for mine thankfully either. still gave me a headache figuring out a way to mount the battery.

[GuyGTi]

as above i didnt pay full price for mine thankfully either. still gave me a headache figuring out a way to mount the battery.

How did you mount your battery? i could do with doing something with mine without moving to the boot.
Guy

[gtimonkey]

I put a K&N filter in

A little tiny bit rasper induction noise, slight difference in overall performance over the stock paper job.

I hacked the plastic deflecter out of my seat intake at the same time. There is an amazing thread here somewhere where somebody measured the pressure drops.

You can get more preformance gain by adjusting your tire pressure