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Old 06-27-2014, 11:02 PM
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K&N drop in

Got the filter today! Well worth the $50 IMO
Turbo spool is a tad louder on boost and off boost. MPG difference I'm not sure about, throttle response seems the same so far.

The plastic baffle thing by the radiator I'm tempted to delete this coming week just to see if I get any increase in air noises. I peeked inside it today and it looks like a silencer chamber with a X guide vane

K&N PN: 33-2304
It's a wee bit tight around the seal since it was designed for the subarus but it does fit and the box does close!

Anywho just sharing my thoughts
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Old 06-28-2014, 11:09 PM
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Nice! I just got the AEM dry filter but haven't noticed any difference in performance or sound.
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Old 06-29-2014, 02:13 AM
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Re: K&N drop in

Isn't our GC diesel equipped with a CAI from the factory? My only gripe is that the airbox is undersized. The filter is physically slightly smaller than the Pentastar. WTF?

Btw...anything that flows more filters less if the filter area is the same. The laws of physics apply.
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Old 06-29-2014, 10:05 AM
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Re: K&N drop in

I've always thought since it's a turbo it'll suck in air quick enough to where you don't need a oversized intake. The factory box snorkels up by the hood/headlight so it technically is a cold air. Woulda been better if they shifted the port to pull through the fender instead, but I'm sure they kept the off-roaders and mudders in mind
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Old 06-29-2014, 10:27 AM
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Re: K&N drop in

I've found that small restrictions in the intake affect turbo spool time noticeably. The barometric pressure in my intake is about 2 psi less than the atmosphere at idle according to my Torque app. That could be improved IMO with a bigger filter and elimination of the poor flowing rubber intake hose. The available AFE CAI documented an improvement in off idle torque which is the spot where the turbo spools. I just don't like the reduced filtration...not good.
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Old 06-29-2014, 01:43 PM
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Re: K&N drop in

I wonder if the ECU will compensate properly if I add in a large front mount IC
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Old 06-29-2014, 02:29 PM
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Re: K&N drop in

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Originally Posted by hi2nr View Post
I wonder if the ECU will compensate properly if I add in a large front mount IC
Diesels don't have an ideal AF mixture to avoid lean (detonation) or rich (plug fowling). The only reason to control AF precisely is to reduce sooting and emissions. The ECU will throw codes if it detects a rich condition (P0172 System too Rich) but I doubt there is a lean condition test. A bigger IC will create a denser air charge which would make the AF leaner so it should be fine. You can't have too much air in a diesel.
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Old 06-29-2014, 03:10 PM
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Re: K&N drop in

There goes my bonus lol
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Old 06-29-2014, 10:48 PM
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Re: K&N drop in

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Originally Posted by ExcursionDiesel View Post
Isn't our GC diesel equipped with a CAI from the factory? My only gripe is that the airbox is undersized. The filter is physically slightly smaller than the Pentastar. WTF?

Btw...anything that flows more filters less if the filter area is the same. The laws of physics apply.
This is sort of true. .. performance filters have deeper baffles in the filter allowing for more filter sfc area over the same filter measured area.
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Old 06-29-2014, 10:49 PM
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Re: K&N drop in

Quote:
Originally Posted by ExcursionDiesel View Post
I've found that small restrictions in the intake affect turbo spool time noticeably. The barometric pressure in my intake is about 2 psi less than the atmosphere at idle according to my Torque app. That could be improved IMO with a bigger filter and elimination of the poor flowing rubber intake hose. The available AFE CAI documented an improvement in off idle torque which is the spot where the turbo spools. I just don't like the reduced filtration...not good.
It's called vacuum. ... you'll never fix it.
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Old 06-30-2014, 12:09 AM
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Re: K&N drop in

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Originally Posted by 2009RavenR1 View Post
It's called vacuum. ... you'll never fix it.
Of course there will always be a difference in pressure from outside to turbo inlet....but how much is the question. The accordion bellowed intake hose creates more resistance than necessary. The MAF sensor housing is fairly restrictive with vanes in both ends. The airbox and filter are undersized. There's room for improvement. AFE's data shows reduced "vacuum" with their CAI.
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Old 06-30-2014, 01:01 PM
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Re: K&N drop in

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Originally Posted by ExcursionDiesel View Post
Of course there will always be a difference in pressure from outside to turbo inlet....but how much is the question. The accordion bellowed intake hose creates more resistance than necessary. The MAF sensor housing is fairly restrictive with vanes in both ends. The airbox and filter are undersized. There's room for improvement. AFE's data shows reduced "vacuum" with their CAI.
I don't see the benefit of trying to get to a 1/1... as soon as the throttle plate opens it goes to atmospheric pressure anyways (instantly) there will be no difference in spool time trying to even this number out (better flow will increase flow tho )
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