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Unread 05-12-2011, 03:29 AM   #16
AoA
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Quote:
Originally Posted by Masaga91 View Post
so i'm planning on buying the k&n, is it worth it??
which K&N? the flat stock box filter, or the full kit?

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Unread 05-12-2011, 08:48 PM   #17
cherokeekid58
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Well if you wanted a cold air intake and are planning on spending 100 bucks, why not just spend the extra dough and get a snorkel? That sucks in very fresh air lol
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Unread 05-12-2011, 10:45 PM   #18
Masaga91
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Quote:
Originally Posted by AoA View Post
which K&N? the flat stock box filter, or the full kit?
the full kit
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Unread 05-12-2011, 11:06 PM   #19
Brookhart63
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Yep. Hot air from engine bay adds 15 hp. Do they send a xxx tape with that kit so you can see somebody besides yourself get screwed? I wouldnt believe it until I see dyno results. I went through the same thing though. I made one and only noticed a large difference in my exhaust note and a small acceleration gain. Regardless of what you get your probably still sucking hot air. Snorkel would look good and be functional as well. be wary of hp promises...
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Unread 05-13-2011, 08:58 PM   #20
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Quote:
Originally Posted by lilnapsak View Post
yeah um.. your going to need to give me some info on how that HHO setup you have is going for you. im planning on doing it to mine soon
mine is doing pretty good, its alotttt of up keep to keep it running right. my autoshop teacher at my high school designed and guided me threw building that set up. it works great, no B.S.
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Unread 05-14-2011, 04:45 PM   #21
MossGreen97
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I see where alot of people put cone filters and cold air kits to increase air flow. The problem I see is most people do not correct the the main culprit to air flow on the 4.0, which is the corrugated elbow at the TB.
At the ends of the elbow, the areas are smooth and cause little or no obstruction to flow. The corrugation on the other hand, causes turbulence which disrupts air flow. To solve this problem, I removed the tube and inserted a piece of 2.5 inch exaust pipe, just long enough to cover the corrugated section of the tube. Lubricated with silicone spray, so that it slid in easier, the metal provided a smooth transition from inlet to outlet of the tube, while still being flexible enough to remove to change air filter. I prevoiusly installed a K&N panel filter in the stock air box, as well as removing the block off plate from the front header panel.

Using a digital air flow meter to measure air flow at the air inlet before and after this mod, the results were a 7 cfm increase in air flow at idle. I still need to take some readings at different RPMs but I didn't have a helper at the time. Removing the turbulence wil increases air flow at all RPMs.
Total cost of mod: K&N filter $48 Exhaust pipe $5
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Unread 05-14-2011, 05:22 PM   #22
DullesJeep
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Going by the seat of the pants dyno, I noticed an increased throttle response after installing my K&N FIPK. When I went for the intake, I also dropped in some edlebrock headers to replace the stock manifold, and replaced all the old exhaust piping, and added a high flow cat. I did the exhaust work about a week before the FIPK drop in, and had good tone, and after the FIPK, I noticed it gave a bit deeper tone, espeically when going WOT.

As for MPG increases, I'd say they're marginal at best.
After having my K&N kit for 2 years, I'd say the best feature is the million mile warranty on the washable filter.
Overall though, now I'm thinking about throwing a snorkel on it just because like everyone else has stated, drawing in warm air doesn't make much of a difference.
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Unread 05-14-2011, 05:50 PM   #23
GregB_00XJ
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Check out the Thor cowl induction setup. Same as a home brew, but with a nice plate to mount to the firewall.

I like the cowl induction idea the best. Isolate the hot engine compartment from the cold air charge, nice cold dense air FTW. I also like the idea of a snorkel, but it would be overkill for me...as I never ford any rivers and don't wheel enough to make it worth it.

Personally I used a K&N drop in filter along with exhaust and induction mods. WAY better acceleration and seat of the pants feel, but probably minimal HP gains and only marginally better gas mileage.

The colder the air the better...
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Unread 05-14-2011, 10:25 PM   #24
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same here, the snorkel doesn't work for me, never take my jeep through water, so why the snorkel, so i'm planning on doing the K&N air intake, then change the full exhaust pipe, from the headers to a nice high flow cat (probably the magnaflow, is the one i like the most hahahah)
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Unread 05-15-2011, 11:13 AM   #25
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K&Ns are junk. They let in way too much dust for what you pay and how little you gain. I've witnessed it with the panel filter on my own Jeep. I wouldn't say a cold air intake is useless, but it has to be setup right, meaning actually get cold air. You are much better off buying a cone filter, and making your own heat shield to seal it off instead of paying 200 bucks for a K&N. Granted, it won't be a "Cold" intake, but cooler air than the stock airbox. Cone filters also have more surface area so they can pull in more air. I noticed a difference in throttle response and gained about 1 mpg (verified by scan gauge 2 and months of spread sheets). I wouldn't buy an intake unless you plan to properly shield it though.
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Unread 05-16-2011, 04:30 PM   #26
Masaga91
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so i was thinking of putting the k&n, and to maximize the cold air flow i was thinking of putting a hood vent like the ones in the l200, well probably half the size, on top of the air intake to maximize the cold air flow, in theory sounds like a good idea, what you guys think of that???????
mitsubishi-l200.jpg  
1405351186744040_1.jpg

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Unread 05-16-2011, 06:22 PM   #27
Jeff9
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Regarding the K&N kit...I just actually took mine off today. There are two studies out there (one on bobistheoilguy.com and the other on a Ford truck forum) that confirmed K&N filters are the worst out there. Yes they let in more air, but they also let in more crap. Additionally, if you look at the K&N dyno (even if you believe the results) you'll notice that any of the small gains don't even register until around 2.5K RPM. I honestly can't remember the last time I exceeded 3K RPMs.

Here is the BITOG study...http://www.bobistheoilguy.com/airfilter/airtest1.htm
If you search for the Ford one you can find it. If I recall correctly, the K&N filter was 96.7% efficient and this was significantly less than any other tested.

I am NOT hating on the K&N system. This is my opinion, and here's what I would have done differently. If you're looking for gains from the intake side of things rather than the exhaust, I'd recommend a 62mm throttle body. Jeepersandcreepers has one for less than the cost of the K&N system. All this being said, if anyone is still interested, I'll gladly sell you my K&N system!
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Unread 05-16-2011, 06:32 PM   #28
DualPurposeXJ
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If your gonna run a k&n and plan to use it offroad get the pre filter for it. Like posted above me they do let in more than just air
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Unread 05-16-2011, 07:10 PM   #29
Masaga91
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look k&n is the brand that i thing, but if you have another brand that is better you can tell, i'm not sold on one brand, i like to have options, but you didn't read my post, the question is, does the hood vent on top of the air intake should work properly in giving a constant cold air flow

and i do off road once every 3 months, that's not my main idea, the car is my dd
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Unread 05-16-2011, 08:05 PM   #30
DualPurposeXJ
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Quote:
Originally Posted by Masaga91 View Post
look k&n is the brand that i thing, but if you have another brand that is better you can tell, i'm not sold on one brand, i like to have options, but you didn't read my post, the question is, does the hood vent on top of the air intake should work properly in giving a constant cold air flow

and i do off road once every 3 months, that's not my main idea, the car is my dd
Ya it should help but what I would recommend is to re-route the intake into the cab for cleaner/cooler air
like so
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