K&N Air Filter - Kia Forum

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post #1 of 23 (permalink) Old 03-10-2011, 09:58 AM Thread Starter
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K&N Air Filter

Anyone considering getting a replacement K&N Air filter??? I think a higher flow filter on the turbo engine would provide better power, fuel efficiency, and more of those sweet turbo noises...

Here's some links to the filters that would work on our cars:

2.0L Turbo - Just replacement filter
33-2448 - K&N Replacement Filters, Replacement Air Filter

2.4L NA - Replacement filter and Intake available
69-5301TTK - K&N 69 Series Typhoon Kits, Performance Intake Kit

I'm kinda disappointed I'm not able to hear the turbo more on my Optima... My '07 VW GTI was fully modified with every performance part short of a bigger turbo and I loved hearing the turbo spool up and I just don't hear any of that with the Optima Turbo... I may be pulling the trigger on one of these filters here shortly and I'll let you guys know what difference it makes...

Here's a pic of my VW GTI I just traded in for my Optima:


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post #2 of 23 (permalink) Old 03-10-2011, 10:09 AM
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Nice looking, I almost got a GTI before looking at the Optima.

Let us know if it really makes a difference.

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2011 Optima SX Corsa Blue (12/10 Build date) - 13% Tint, LED interior lighting, "Big Boy" horn, BFGoodrich G-Force Sport Comp 2
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post #3 of 23 (permalink) Old 03-10-2011, 11:15 AM Thread Starter
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So I just realized from looking on kiatechinfo that our cars don't seem to have mass air flow sensors (MAF)..... WTF!!! That's really odd...
Here's a link to the PDF showing the engine's sensors on the 2.0T:
https://docs.google.com/viewer?a=v&p...thkey=CIuq5uAH
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post #4 of 23 (permalink) Old 03-10-2011, 08:23 PM
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This topic comes up on every new car forum. K&N is a pure marketing ploy, and will do nothing for you car's performance. If they worked car makers would install them (or something like them) at the factory. It's possible that it might save you a couple dollars after 5+ years but at the cost of a lot if cleaning and re-oiling on your part.
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post #5 of 23 (permalink) Old 03-10-2011, 10:37 PM
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Quote:
Originally Posted by L0U D0G View Post
So I just realized from looking on kiatechinfo that our cars don't seem to have mass air flow sensors (MAF)..... WTF!!! That's really odd...
Here's a link to the PDF showing the engine's sensors on the 2.0T:
https://docs.google.com/viewer?a=v&p...thkey=CIuq5uAH
They have MAP (manifold absolute pressure) sensors instead.
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post #6 of 23 (permalink) Old 03-11-2011, 07:51 AM Thread Starter
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Originally Posted by rwm View Post
This topic comes up on every new car forum. K&N is a pure marketing ploy, and will do nothing for you car's performance. If they worked car makers would install them (or something like them) at the factory. It's possible that it might save you a couple dollars after 5+ years but at the cost of a lot if cleaning and re-oiling on your part.
So are you saying that modifying the car's intake system, such as putting on an intake, is also a marketing ploy?
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post #7 of 23 (permalink) Old 03-11-2011, 08:00 AM Thread Starter
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Originally Posted by amandanator View Post
They have MAP (manifold absolute pressure) sensors instead.
Yeah I saw that from the diagram but I was unaware that the manufacturers were doing this now. My VW had both a MAF and a MAP sensor and when I was working with a local tuner to develop custom intake systems for the 2.0T engine, having the MAF location in the wrong place caused severe problems with the A/F ratio. Normally you see people removing the MAF for custom big turbo setups or on diesels... It's pretty cool though...
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post #8 of 23 (permalink) Old 03-11-2011, 10:01 AM
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Originally Posted by L0U D0G View Post
Yeah I saw that from the diagram but I was unaware that the manufacturers were doing this now. My VW had both a MAF and a MAP sensor and when I was working with a local tuner to develop custom intake systems for the 2.0T engine, having the MAF location in the wrong place caused severe problems with the A/F ratio. Normally you see people removing the MAF for custom big turbo setups or on diesels... It's pretty cool though...
From what I've read, Kia has been using the MAP sensors for quite a while now. My understanding is they also work better for turbos (less problems) than a MAF...don't know if this is true or not. I'm not very knowledgeable about them one way or other.
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post #9 of 23 (permalink) Old 03-11-2011, 07:59 PM
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If you don't plan on keeping a car for very long, the K&N filters don't make much sense.

I paid $40 for a K&N filter for my girl's Toyota when we got it in 2005, so it was definitely worth the money compared to replacing the paper filter every 6 months to 1 year.

I've had the 9" open cone K&N air filter in my supercharged 3.8L Pontiac for almost 10 years. It did offer a performance improvement over the restrictive stock air box. But not as much as a fully enclosed or fenderwell CAI setup.

If you do buy a K&N for your Optima, the cheapest place to buy the recharge kit is on Amazon.com for just $9. (Buy three to get free shipping.)

The kit usually lasts me about 2-3 years for the two cars. So I definitely think the K&N is worth the price since the disposable paper air filters are usually at least $10 at Advance Auto or Pep Boys.


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post #10 of 23 (permalink) Old 03-12-2011, 10:23 AM
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An air filter replacement is about allowing more into the engine, the truth is stock panel filters flow pretty well these days and the cars are expecting a certain range in air volume. If more is seen, the car compensates and no added power is usually gained.
Realistically though, a full cold air intake on a modern car will get about 6-7 whp peak at best. On a 274 hp car, that is not even physically noticeable. A panel filter may get you 2-3 peak so it would not even be consistently measurable on a dyno.

On a modern turbo car, the vehicle first needs to be programmed to want more air in.
Also air in is not the problem today, its exhaust out.
The most restriction in the system is going to be the catalytic converters.

Take my 2.0T genesis coupe as an example, the intake did nothing noticeable. Even those with full turbo back exhausts, inter-coolers, and intakes on an otherwise stock car don't see much gain. The tune did an amazing transformation. $599 for 4 whp and near over 60 pound feet of torque. It also only took about 15 second to do. However now that I have a reworked turbo, that intakes has benefits as I need more air.

BTW, this is coming for the optima at some point. Rumor has it is in testing on the 2.0T sonata ATM.
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