k&n air filter tune - IMBOC
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post #1 of 10 (permalink) Old 02-15-2018, 11:28 AM Thread Starter

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Arrow k&n air filter tune

my all stock 25,000 mile car i just put a k&n in it. do i need to get this car on a dyno and tune it for the extra airflow or will the ecu adjust to it?
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post #2 of 10 (permalink) Old 02-15-2018, 01:25 PM
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I doubt it, since we already have a cold air intake stock. Which leads me to asking why the K&N??? I still use the stock filter.

(edit) I have read of over oiled K&N's making the throttle body dirty...would advise caution there.

Last edited by pwd72s; 02-15-2018 at 01:44 PM.
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post #3 of 10 (permalink) Old 02-15-2018, 07:42 PM
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Your sensor will read any changes in airflow, and message the ECM. There is no increase in air flow, unless you don't oil it, which is dumb. If you don't oil it, it won't filter the air. If you do oil it, the air flow actually tends to be decreased.


A tune would be for some modifications from factory that present a radical change in engine dynamics and operational parameters. There are several thousand Mustangs running around quite nicely with nothing other than the factory tune and several if not multiple bolt on performance parts.

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post #4 of 10 (permalink) Old 02-15-2018, 09:52 PM
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Really...despite advertising claims, I suspect you'd see zero or near zero power gains by going K&N, but you might find it allows more particulate through than the stock Ford performance filter...
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post #5 of 10 (permalink) Old 02-16-2018, 02:02 AM

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I've used K&N filters off and on over the years with no need for a tune in Ford or GM engines. There are lots of opinions and legitimate studies on the efficacy of K&N filters -- some favorable, some not. Interestingly, Ford Racing includes a K&N filter in their "Power Upgrade Package" for 2011-2014 Mustang GT's:

https://performanceparts.ford.com/part/M-FR1-MGTB
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post #6 of 10 (permalink) Old 02-16-2018, 02:43 AM
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The changing to a KN or other reusable air filters do not need a tune. The air mass sensor in the intake tube "reads" the air flow just beyond the air filter, in the intake tube.
The air mass sensor reading is calibrated in the ECM for the diameter of the OEM intake tube and the diameter of the OEM throttle body. A tune is only needed if the diameter of the intake tube or throttle body is changed.
There is much debate on reusable air filters on their efficiency and oil effects. Most folks put too much oil on the reusable air filters, or neglect to clean them regular. I recommend a second filter, ready to go, cleaned and excess oil drained off.
Routine cleaning of the intake manifold-cylinder heads is necessary. Not so much from the oil from a reusable air filter but from the engine vapors (oil) recycled through the intake manifold, as the motor has a closed system with no PCV valve.
I use a JLT oil separator. On a 4.6 naturally aspirated, it is only needed on the driver's side, as the passenger side is the intake. It collects an ounce or so of oil vapors every 1-2 thousand miles. Depends on use of the go pedal, cause at a track day, an ounce in a day. That is oil that would have otherwise dirtied the intake manifold interior, the valves and spark plugs.
And for best underhood bling on a green Bullitt, a Green brand reusable air filter...
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Last edited by tossass4370; 02-16-2018 at 02:53 AM.
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post #7 of 10 (permalink) Old 02-16-2018, 12:14 PM
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Definitely in favor of the JLT oil separator...
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post #8 of 10 (permalink) Old 02-16-2018, 12:43 PM Thread Starter

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I have used K&N filters for many years and like the performance and the fact you can clean and re oil. never over oiled them and have never had any issues with mass airflow sensors at all. Hell most of my cars had carb"s LOL.
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post #9 of 10 (permalink) Old 02-16-2018, 04:48 PM
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No increase in HP with K&N. The throttle body can only take in so much air.
The oil separator is a good idea. Have built a few road course race Mustangs over the years and you'd be surprised how much oil precipitates in the separator. Otherwise it ends up in the manifold or on the backs of the intake valves, which can cause pre-ignition eventually. The carbon will glow like charcoal and flash the fuel. Also can cause rough idle, seen especially in newer direct injection engines. That's one of the reasons why a lot of new engines use port and direct injection. Double the pleasure double the fun...
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post #10 of 10 (permalink) Old 02-22-2018, 07:33 AM

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These air filters create a little more power [ and I do mean a little ] but also create another condition.

More air= more dirt.

Found this out the hard way through an oil analyse .

A fix is using a great oil filter - like Amsoil eA.

As with all mods from stock - there are compromises...... and consequences.
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