Significant gain with just an AFE Pro 5R filter drop-in

[AZT]

I currently have APR Stage 1 and otherwise stock. Intake is bone stock and stock filter only has 2500 miles on it (looked 100% clean). I did a before and after test of just the AFE Pro 5R 10-10121 filter drop-in.


I know the stock intake does have other deficiencies but I was curious what a filter alone could do. I selected this particular aftermarket filter as it had an inverted cone top for additional surface area and was AFE's best flowing design (better than the Pro Dry, though the Pro Dry filters a little better). Installation was a perfect fit.

I logged 3 WOT runs immediately before and after (exact same ambient pressure and conditions). Bypass was 100% closed in all runs as per APR Stage 1 programming.

Boost pressure increased with the AFE filter roughly 15-35 hPA (highest in the upper RPMs) which equates to almost a 0.5 psi boost increase at its peak. This implies the filter was resulting in less negative pressure before the supercharger.



The PerfExpert app says I gained +8whp and +6 lb-ft torque. Not bad for a $70 filter and 20 minutes of time. I am going to assume the PerfExpert is being a little optimistic, but I've consistently dynoed 333-336whp on the stock filter even on different days (the app has SAE correction for local ambient conditions built in). And the boost increase would seem to roughly align. We'll see as I'll do some more runs this week.

Stock Filter

AFE filter

[the4siswickid]

Personally, I'm against air charged fitters.... But the Pro Dry, sounds promising!!!! Where is the best place to get it???? Amazon??? Anyone know the part numbers?


Sent from my iPad using Tapatalk

[bbhbba]

Here's the link to AfE Power
http://afepower.com/shop/details_new...0L&&brandID=59

The part number is 11-10121. Amazon has the best price ==> $64
http://www.amazon.com/aFe-11-10121-M...words=11-10121

Personally, I'm against air charged fitters.... But the Pro Dry, sounds promising!!!! Where is the best place to get it???? Amazon??? Anyone know the part numbers?


Sent from my iPad using Tapatalk

[AZT]

Just to be clear I tested the Pro 5R (part#10-10121) oiled filter. The part#11-10121 is their Pro Dry S version. Apparently it flows roughly 10% less than the Pro 5R or so I was told. Which still may be alot better than stock paper

[XLR8 Craig]

I have always been a fan of AFE's filters and never had problems with filtration. The flow increase alone on forced induction vehicles is pretty awesome. Only filter I've use on my S300-S400 turbo builds on diesels. I can get these too, if anyone is interested, just shoot me a PM.

[MrFunk]

Good filter. I'm running it with my AWE intake.

[SouthernBoy]

I see that this filter is oil wetted, one of the reasons I never liked the K&N filters. Wouldn't a dry element filter be a better choice? Which dry element filters are best for the S4 applicaton?*


* I don't have an S4 yet. It's on order and not expected to arrive probably for another two months.

[Sailingtime]

Would be interesting to see how all the filter performed against each other. Apr, AWE, K&N etc... thanks for doing the write up cool info.

[AZT]

Good filter. I'm running it with my AWE intake.

Speaking of AWE, before purchasing I asked AFE for the flow specs on this filter, and they came back with 221CFM @ 1.5" H2O (which they also say was 25% better than the OE paper filter).

K&N's filter (E-1987) is rated at 223 CFM @ 1.5" H2O.

What's a bit of a mystery is AWE also did a flow bench test on their S-flo filter and the stock filter, and the results were that the stock filter flows [email protected]" H2O and their S-flo filter flows 330 [email protected]" H2O.

So 330 CFM vs 221 CFM - is AWE was using a special cotton gauze that flows 50% better per square inch than the competitors ? Highly doubtful.

Then I saw that K&N's test sheet mentioned using the OE airbox as the test fixture, which obviously has other flow restrictions that would ultimately limit the CFM. My guess is AFE did as well (and AWE did not) and so its apples to oranges. Either that or AFE just made a mistake with the flow number.

[MrFunk]

I see that this filter is oil wetted, one of the reasons I never liked the K&N filters. Wouldn't a dry element filter be a better choice? Which dry element filters are best for the S4 applicaton?*


* I don't have an S4 yet. It's on order and not expected to arrive probably for another two months.

Oiled filter issues were around the oil getting on the MAF sensor in the intake and frying it. These cars don't have MAF sensors... You obviously don't want to over oil (which the K&N filters were always)... I have not heard of any issues with oiled filters in this application... (BTW - I also shared your concerns when choosing an intake filter but after research discovered oil filters are fine)

[AZT]

I see that this filter is oil wetted, one of the reasons I never liked the K&N filters. Wouldn't a dry element filter be a better choice? Which dry element filters are best for the S4 applicaton?

As MrFunk said the MAF was the usual concern and we don't have one.

I wasn't always an oiled cotton filter fan and actually preferred the stock paper filter in my tuned B5 S4 (with an airbox mod). That panel had very deep pleats which resulted in far more effective surface area than a shallow oiled cotton filter, and I think that cancelled things out - I didn't really see a gain in that application.

On the other hand I look at our stock cone filter in the B8 S4. The outside is a decent surface area but the paper pleats are more shallow than my B5 S4 filter for less effective surface area. I can see in that situation how an oiled cotton filter can easily outflow it.

[PitchS4]

Oiled filter issues were around the oil getting on the MAF sensor in the intake and frying it. These cars don't have MAF sensors... You obviously don't want to over oil (which the K&N filters were always)... I have not heard of any issues with oiled filters in this application... (BTW - I also shared your concerns when choosing an intake filter but after research discovered oil filters are fine)

I don't want oil getting on my supercharger blades so I went with a pro dry. No proof it would ever be an issue just didn't want to take the risk.

[B8 S4]

Will this fit roc-euro?

[mehware]

So I can buy just the filter with the stock air box. Then swap it in and the engine knows how to adapt? Getting EPL tune this weekend. Stage 1 then 2. Will this be sufficient on just the filter? Is there any noise increase with more airflow?

Thanks for the research op!

[mehware]

Here's the link to AfE Power
http://afepower.com/shop/details_new...0L&&brandID=59

The part number is 11-10121. Amazon has the best price ==> $64
http://www.amazon.com/aFe-11-10121-M...words=11-10121

Thanks for the link. I have a 2013 S5. Amazon says it doesn't fit my vehicle. Are they lying? Same 3.0T engine!

[SouthernBoy]

Oiled filter issues were around the oil getting on the MAF sensor in the intake and frying it. These cars don't have MAF sensors... You obviously don't want to over oil (which the K&N filters were always)... I have not heard of any issues with oiled filters in this application... (BTW - I also shared your concerns when choosing an intake filter but after research discovered oil filters are fine)

Yes, MAF issues were my major concern with this. Also the throttle plate. I had a 1988 Mustang LX 302 (5.0 for the liter lovers) and used a K&N for a while. What I found out was that a tiny bit of oil would tend to stick on the edges of the throttle plate and then that would have a tendency to stick on the throttle body. Also, with oil wetted filters, their flow rate tends to diminish as they get dirty because dirt and debris sticks to the oiled surface. I found this to be the case with my 2004 Acura TL when using the OEM filter. It was oiled on one side (windward side) and dry on the other side (lee side). I imagine these filters you folks are using have come a long way.

Since the S4 doesn't make use of a MAF (I didn't know this), does it use the speed density system for fuel mapping and spark? My Acura and my former Mustang used this software. Don't have to worry about burning out a MAF wire or screen and then going in to "limp home mode" (had this happen with one car I owned).

[AZT]

So I can buy just the filter with the stock air box. Then swap it in and the engine knows how to adapt? Getting EPL tune this weekend. Stage 1 then 2. Will this be sufficient on just the filter? Is there any noise increase with more airflow?

Thanks for the research op!

That's correct. Fits in stock airbox and ECU sees the additional airflow and will adapt. I can't say I noticed any significant change in sound (*maybe* there was a miniscule increase in engine sound). You may want to consider doing a full intake for maximum gains especially with Stage 2 - I just did this to see what is possible with maintaining the OEM intake. Based on other evidence the gains probably double if you address the other restrictions like the stock airbox and the throttle body intake tube.

Thanks for the link. I have a 2013 S5. Amazon says it doesn't fit my vehicle. Are they lying? Same 3.0T engine!

This is the one I tested and yes Amazon will say it doesn't fit the 3.0TFSI but it will (I also assume S5 uses the identical airbox as S4).
http://www.amazon.com/aFe-10-10121-M.../dp/B00727FG9O

[Frinkferta]

I've had the dry filter for about 5k miles now. It adds some additional sound, not much. I did remove the top of the intake box for a short period of time, that allowed for more sound. I've been pretty happy with it so far. I can't say it did too much for me on the 1/4 mile. I ran a 13.0 with a stock tune, filter and exhaust.

[AZT]

Will this fit roc-euro?

This filter may have a slightly bigger flange (3.625" if i recall, Roc-Euro is 3.5" or less?) but either way, I doubt it flows any better than the Roc-Euro filter as they appear to have similar design. And if you need a new filter for your Roc-Euro their replacement looks like it is a little cheaper.

[mehware]

That's correct. Fits in stock airbox and ECU sees the additional airflow and will adapt. I can't say I noticed any significant change in sound (*maybe* there was a miniscule increase in engine sound). You may want to consider doing a full intake for maximum gains especially with Stage 2 - I just did this to see what is possible with maintaining the OEM intake. Based on other evidence the gains probably double if you address the other restrictions like the stock airbox and the throttle body intake tube.



This is the one I tested and yes Amazon will say it doesn't fit the 3.0TFSI but it will (I also assume S5 uses the identical airbox as S4).
http://www.amazon.com/aFe-10-10121-M.../dp/B00727FG9O

Have gift cards on prime. Ordered!

aFe 11-10121 Pro Dry S Grey Magnum Flow OE Replacement Air Filter for Audi A4 V6 3.0L/3.2L

Went with dry versus oiled.

Arrives in two days. I'll return it if it doesn't fit!

Thanks again!

[Sailingtime]

Speaking of AWE, before purchasing I asked AFE for the flow specs on this filter, and they came back with 221CFM @ 1.5" H2O (which they also say was 25% better than the OE paper filter).

K&N's filter (E-1987) is rated at 223 CFM @ 1.5" H2O.

What's a bit of a mystery is AWE also did a flow bench test on their S-flo filter and the stock filter, and the results were that the stock filter flows [email protected]" H2O and their S-flo filter flows 330 [email protected]" H2O.

So 330 CFM vs 221 CFM - is AWE was using a special cotton gauze that flows 50% better per square inch than the competitors ? Highly doubtful.

Then I saw that K&N's test sheet mentioned using the OE airbox as the test fixture, which obviously has other flow restrictions that would ultimately limit the CFM. My guess is AFE did as well (and AWE did not) and so its apples to oranges. Either that or AFE just made a mistake with the flow number.

I always wonder about claims aftermarket manufacturers make against OEM or competition, and if you call them out they immediately reference faulty testing procedures as culprit. It's not a big deal however it makes you stop and think how much better are the aftermarket products and are they really going to make that much of a difference in performance for the cost??

[draekin13]

I've got the AFE pro dry in both my A4 (2.0T) and my S4 and both feel slightly more responsive. I got lucky and got a coupon for the one for my S4 from Amazon, dropped it down to ~$55 totally worth the money even if I had to pay full price.

[bbhbba]

2013 S5 and 2014 S4 share the same engine and intake system. It will fit. I had the same one from Amazon (Pro Dry S) for my '13 S4 and the fitment was perfect. You will be fine and pleased with the quality.

Have gift cards on prime. Ordered!

aFe 11-10121 Pro Dry S Grey Magnum Flow OE Replacement Air Filter for Audi A4 V6 3.0L/3.2L

Went with dry versus oiled.

Arrives in two days. I'll return it if it doesn't fit!

Thanks again!

[chaos2984]

You get more flow from all these aftermarket filters due to they filter the air less and are less restrictive then stock. Factory filter filters down to say 5 microns and the aftermarket filters down to 10 microns. That difference lets more in air in quicker and faster. But you loose a little filtration. its like trying to pull a golf ball threw a garden hose or a golf ball threw a fire hose type of thing.

[the4siswickid]

Here's the link to AfE Power
http://afepower.com/shop/details_new...0L&&brandID=59

The part number is 11-10121. Amazon has the best price ==> $64
http://www.amazon.com/aFe-11-10121-M...words=11-10121

Thank you!!!!!!


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[mehware]

Installed it today. The S Pro Dry on the 2013 S5. Man was my stock filter dirty. Easy install. Except dropped a screw and had to undo the bottom plastic guard to drop it out! Oops.

I don't know if it's because the filter is clean or a "performance" filter but car seems more responsive and pulls harder. Tune coming soon!





Matt

[ruamit03]

Would this work with Apr intake? I am looking at the pictures don't really see a neck for clamp.

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[AZT]

Would this work with Apr intake? I am looking at the pictures don't really see a neck for clamp.

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This filter has 2 bolts molded into it designed to mate with the stock airbox mounting holes. Not sure how feasible it would be with APR intake though I recall it at least re-uses that inlet adapter from the stock airbox.

[anerbe]

Matt

Nice teeth!

[torinalth]

ordered the pro 5r as well... curious if anyone's sceondary pipe (like apr stage 2 pipe) could be utilized.

[mehware]

Nice teeth!

Lol. Been working on that smile for years.