Aftermarket Performance Air Filter

[MidnightT4]

I was going to get the K&N paper filter one for the volvo.

I stuck one in the the G.F Kia and it has stopped an annoying over rev when slowing down and pushing clutch in. Has also stopped the flat spot at certain revs.

they do make a difference bu in HP terms very little

[T5Sweep]

Originally Posted by Chief inspector

9 times out of 10 these things make conditions worse and can void your warranty, especially if its the oiled one as it contaminates the MAF, they say it doesn’t, but you wont be oiling it in their lab.

Its a filter, its job is to filter air, to prevent muck contaminating the engine, throttle body and air flow measuring equipment. These are worse at filtering air so a backwards step and potentially a warranty voiding action.

And usually they also have a worse pressure drop than a standard one at full revs so you actually lose power.

These things are really for carburettors and a relic from a bygone age, modern cars dont save 20p on filters any more as they have a direct bearing on important items for sales like emissions and fuel economy.

Please don't spout such B.S on a public forum about something you clearly know very little about.

There have been endless magazine features on flow bench testing the difference in not only the CFM gains over stock paper filters, but also in filtration.

Having grown up around modified cars, I have never seen or even heard of anyone having MAF failures because of the tiny film of oil on these filters.

[LordLucan]

shots fired!

where's the popcorn emoji when you need it

[Zebster]

Originally Posted by T5Sweep

Please don't spout such B.S on a public forum about something you clearly know very little about.

There have been endless magazine features on flow bench testing the difference in not only the CFM gains over stock paper filters, but also in filtration.

Having grown up around modified cars, I have never seen or even heard of anyone having MAF failures because of the tiny film of oil on these filters.

Your venom would be easier to understand if you'd posted links to a credible source to back up your claim...

[Whippy]

Unless of course the filter was made from powdered unicorn horn.

[Zebster]

Originally Posted by Whippy

Unless of course the filter was made from powdered unicorn horn.

Here's one that must have been...

Originally Posted by sk546

...Peak difference was about 45bhp and 60lbft but the power difference throughout the rev range was massive (area under the graph and all). The people doing the power runs were quite shocked the difference just a filter made, they were sure Audi had done something...

[XC90Mk1]

Originally Posted by T5Sweep

Please don't spout such B.S on a public forum about something you clearly know very little about.

There have been endless magazine features on flow bench testing the difference in not only the CFM gains over stock paper filters, but also in filtration.

Having grown up around modified cars, I have never seen or even heard of anyone having MAF failures because of the tiny film of oil on these filters.

To be fair the original paper filter has an enclosed intake with feed where as a lot of the induction kits are left open to the hot engine and will not offer appreciable gains.

Oil disturbing the MAF? Not sure. Re-oiling over zealously and I could see it.

[Chief inspector]

Originally Posted by Zebster

Your venom would be easier to understand if you'd posted links to a credible source to back up your claim...

PMSL ! ....allow me to counter the other unsubstantiated opinion above with my own unsubstantiated opinion.....

Like you, I’d be more worried about the 40hp gain with a filter, unless its on a train.

My brother works for Bosch in Australia, he designs the OEM intakes for Alfa, Maserati, Ferrari and mundane stuff as well. OEM intakes are tuned in length, static resistance, filters cost buttons and are as big as they can be given the engine bay. Sometimes later models get comporomised of course. MAFS dont get contaminated with filter oil, they get gunged up because of the filter that needs to be wetted with oil that doesnt filter properly. In fairness, most mucky MAF’s are apparently due to blocked crankcase breathers.

And he still does oil bath filters...for desert spec plant and military equipment.

So no, I dont know, but I know a man who does and he tells me that crap filters on OEM are pretty rare these days, although exhausts are a different story.

[Zebster]

Originally Posted by Chief inspector

PMSL ! ....allow me to counter your unsubstantiated opinion with my own unsubstantiated opinion.....

I’d be more worried about the 40hp gain with a filter, unless its on a train.

My brother works for Bosch in Australia, he designs the OEM intakes for Alfa, Maserati, Ferrari and mundane stuff as well. OEM intakes are tuned in length, static resistance, filters cost buttons and are as big as they can be given the engine bay. Sometimes later models get comporomised of course. MAFS dont get contaminated with filter oil, they get gunged up because of the filter that needs to be wetted with oil that doesnt filter properly. In fairness, most mucky MAF’s are apparently due to blocked crankcase breathers.

And he still does oil bath filters...for desert spec plant and military equipment.

So no, I dont know, but I know a man who does and he tells me that crap filters on OEM are pretty rare these days, although exhausts are a different story.

You've addressed this reply to the wrong person. I'm on your side of this argument! It's T5Sweep that I replied to...

[Chief inspector]

Originally Posted by Zebster

You've addressed this reply to the wrong person. I'm on your side of this argument! It's T5Sweep that I replied to...

Yes I know Zebster, I started off by admiring your scepticism!