"Cold-air intakes" and "high-flow air filter" FAQ

JSWTDI09 · Nov 4, 2014

TDIatomic said:
Anyone have recommendations for a cold air intake for the 2.0L TDI, I have been looking around and found that aFE sells a intake for the 2009 tdi jetta but I am not familiar with them and am not sure if its worth the money.

Did you read the rest of this thread? The best recomendation for a CAI is to stick with the CAI that VW put in your car at the factory. All of the aftermarket ones either filter worse or cause other problems. Your car came with an excellent CAI and unless you have done some serious mods to your car (like bigger turbo), it will pass far more then enough air for your engine.

A CAI can have a noticeable effect on a normally aspirated gasoline engine, but your turbo charger is more than capable of giving your car all the air it needs. Save your money and put it where it will actually do some good.

Have Fun!

Don

79jasper · Nov 4, 2014

^ What he said.
To a point, IAT won't really affect a turbo engine. It's gonna be heated by the turbo, and then cooled by the intercooler (if applicable) anyways.

Sent from my SM-T537R4 using Tapatalk

oilhammer · Nov 5, 2014

Just to be clear, when he says "IAT" (intake air temp) he means pre-compressor. The IAT sensor post-compressor most certainly does make a HUGE difference in fuel and timing maps to the engine, which is why it is measured so carefully by the ECU at that point, and not at the MAF.

79jasper · Nov 5, 2014

Yes, yes. Pre-turbo.
Should've stated that.

Sent from my SM-T537R4 using Tapatalk

VeeDubTDI · Nov 9, 2014

TDIatomic said:
Anyone have recommendations for a cold air intake for the 2.0L TDI, I have been looking around and found that aFE sells a intake for the 2009 tdi jetta but I am not familiar with them and am not sure if its worth the money.

Welcome! There are 147 posts prior to yours in this thread that are worth reading.

vintagecar1 · Dec 25, 2014

air finters

has anyone used a AEM REPLACEMENT AIR FILTERTHIS IS A DRY FLOW CLEANER?
Go nuts.
Edit: know what would be cool? Maybe someone can make a nifty, tastefully funny but small and useful button picture that links to this thread for future threads discussing this subject. This would be a useful thing to do for other FAQs as well. For your convenience and a start, you can copy and paste this hyperlinked thing to offending threads:
Read the "Cold-air intakes" and "high-flow air filter" FAQ![/QUOTE]

40X40 · Dec 25, 2014

vintagecar1 said:
has anyone used a AEM REPLACEMENT AIR FILTERTHIS IS A DRY FLOW CLEANER?
Go nuts.
Edit: know what would be cool? Maybe someone can make a nifty, tastefully funny but small and useful button picture that links to this thread for future threads discussing this subject. This would be a useful thing to do for other FAQs as well. For your convenience and a start, you can copy and paste this hyperlinked thing to offending threads:
Read the "Cold-air intakes" and "high-flow air filter" FAQ!

[/QUOTE]

Yes, several people have used several replacement DRY filters..... to no advantage, on a stock or even moderately hot rodded TDI.

If you have ENOUGH, getting more is pointless.... If you NEED more, then more is good to have.

Bill

Black tdi cup · Jan 3, 2016

Is anyone running a Apr air intake on their tdi

LNXGUY · Jan 4, 2016

Black tdi cup said:
Is anyone running a Apr air intake on their tdi

Don't waste your time or money.

Black tdi cup · Jan 4, 2016

LNXGUY said:
Don't waste your time or money.

Going 2260 turbo. I already know it does nothing but noise. What I do need to know is what they did with the hose that is in front of the maf. Not really sure what the rubber hose is or does.

BuzzKen · Jan 4, 2016

Black tdi cup said:
Going 2260 turbo. I already know it does nothing but noise. What I do need to know is what they did with the hose that is in front of the maf. Not really sure what the rubber hose is or does.

n75 vacuum vent. Just put a little filter on it and leave it to atmosphere.

Black tdi cup · Jan 4, 2016

BuzzKen said:
n75 vacuum vent. Just put a little filter on it and leave it to atmosphere.

Not sure I totally understand. Put a filter on the end of the hose or make a hole in the intake and put in a filter and connected it that way.

turbovan+tdi · Jan 4, 2016

Black tdi cup said:
Not sure I totally understand. Put a filter on the end of the hose or make a hole in the intake and put in a filter and connected it that way.

Put a filter on the end of the hose OR you could put a nipple on the new air intake tube and put it there.

Black tdi cup · Jan 4, 2016

You wouldn't happen to know who makes a filter that small or where to get one. And would it be smart to swap for a dry filter. I hear mafs don't like the oil.

turbovan+tdi · Jan 4, 2016

Black tdi cup said:
You wouldn't happen to know who makes a filter that small or where to get one. And would it be smart to swap for a dry filter. I hear mafs don't like the oil.

Ebay, Jegs, Summit or go get a small engine fuel filter.

Yep, I would use a dry filter.

Black tdi cup · Jan 4, 2016

turbovan+tdi said:
Ebay, Jegs, Summit or go get a small engine fuel filter.
Yep, I would use a dry filter.

Thanks for your help

JFettig · Jan 5, 2016

Jeep CRD has a tiny filter with a nipple on it that works quite well. I think its around $10 from the dealer.

Black tdi cup · Jan 5, 2016

JFettig said:
Jeep CRD has a tiny filter with a nipple on it that works quite well. I think its around $10 from the dealer.

I'll try and see if I can find one

duke21 · Feb 5, 2016

Is standard airbox in BKD/BMN 2.0 PD 16v engines bottleneck using gtb2260 turbo?

Bace · Feb 5, 2016

The issue with a big turbo is spool-up time and low end boost, both these things can be improved significantly with a upgraded air filter system.

But if we are talking hard numbers - then you will be able to reach more or less the same power with the standard airbox.

HailPeyton · Mar 15, 2016

I know everyone says a CAI on a TDI is pointless, but I actually need more room in my engine compartment. Does anyone know of a CAI system that will fit a 2005 Beetle, from what I understand a golf/jetta kit won't work.

JBell · Mar 15, 2016

Quick question about the OEM filters with and without the cold weather filter....does that impede flow any? I bought my Touareg in Colorado but live in Las Vegas, and it came with the cold weather, or the "A" at the end of the part number.

Nathaniel.Troy · Mar 24, 2016

has anyone used the http://www.greenfilterusa.com/ filters? just bought a spare car and it had one it in, wondering if its actually worth using over the OEM paper filters?

Bob_Fout · Mar 24, 2016

Nathaniel.Troy said:
has anyone used the http://www.greenfilterusa.com/ filters? just bought a spare car and it had one it in, wondering if its actually worth using over the OEM paper filters?

The OEM filters work perfectly fine, even for modded cars. If you want a cleanable filter, synthetic dry-flow filters are available. No reason to ever use an oiled cotton filter. OEM filters are cheap and the R&R interval is long enough, the savings from a re-usable filter just isn't there.

JSWTDI09 · Mar 24, 2016

Nathaniel.Troy said:
has anyone used the http://www.greenfilterusa.com/ filters? just bought a spare car and it had one it in, wondering if its actually worth using over the OEM paper filters?

It looks like almost any other aftermarket filter (like AEM or K&N) except that it uses a green dyed oil. Avoid all oiled air filters on TDI engines. The oil has a bad habit of fouling MAF sensors. Also these filters have far less actual filter area. To have less filter area and "improved" air flow requires poorer filtering. Stick with the stock filter and air intake unless you have made some serious modifications to your engine (like a big turbo).

Have Fun!

Don

Nathaniel.Troy · Mar 24, 2016

Bob_Fout said:
The OEM filters work perfectly fine, even for modded cars. If you want a cleanable filter, synthetic dry-flow filters are available. No reason to ever use an oiled cotton filter. OEM filters are cheap and the R&R interval is long enough, the savings from a re-usable filter just isn't there.

That's what I thought, this filter is almost like looking through a big screen lol, doesn't seem like it'd help all that much, thanks for the reply

JSWTDI09 said:
It looks like almost any other aftermarket filter (like AEM or K&N) except that it uses a green dyed oil. Avoid all oiled air filters on TDI engines. The oil has a bad habit of fouling MAF sensors. Also these filters have far less actual filter area. To have less filter area and "improved" air flow requires poorer filtering. Stick with the stock filter and air intake unless you have made some serious modifications to your engine (like a big turbo)

I agree on the surface area, the paper filter has more than double the ridges. And I'm going to be using the 1756vk, does that count as big? Lol

79jasper · Mar 24, 2016

I wouldn't pay that much, but does anyone know anything about the vw racing air intakes?
Like these. https://www.ecstuning.com/ES2839120...EKB2dYX4tToGfgaUNpG_hq-ENj0U6-diigaAhjW8P8HAQ

Sent from my SAMSUNG-SM-G935A using Tapatalk

fxk · Mar 24, 2016

Sounds like the same snake oil by a different maker.

79jasper · Mar 24, 2016

Probably. I was trying to find some info on the filter element itself to see what it is.

Sent from my SAMSUNG-SM-G935A using Tapatalk

hajes · Jan 16, 2017

From VCDS/Polar FIS I see pressure loss 150-200hPa at idle. It would be even more at full load. Reading from MAP sensor behind the IC.

I came accross this thread in search of before turbo losses for calculating pressure ratio for ECU calibration data.

Some says there is about 50hPa drop before turbo...no idea. Most of this pressure drop is caused by OEM IC and manifold.

From this thread I see that replacing inlet/before turbo manifold with twin cone filter and silicon hose wouldn't make much difference.

I have seen some tests long time ago and paper OEm filters are superior to any so called performance filters. This guy meassured 2.5% better filtration with OEM paper air filter. It is always a compromise of filtration and air flow.

"Cold-air intakes" and "high-flow air filter" FAQ

Top Post Dawg

Veteran Member

Certified Volkswagen Nut & Vendor

Veteran Member

Wanderluster, Traveler, TDIClub Enthusiast

New member

Experienced

Active member

Top Post Dawg

Active member

Vendor , w/Business number

Active member

Top Post Dawg

Active member

Top Post Dawg

Active member

Vendor

Active member

Veteran Member

Member

Well-known member

Veteran Member

Veteran Member

Oil Wanker

Top Post Dawg

Veteran Member

Veteran Member

Veteran Member

Veteran Member

Active member