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Unread 06-02-2004, 06:56 PM   #1
Larry02
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K&N Filter

Does it make any difference - performance - not worried about fuel economy because performance will override economy!

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Unread 06-02-2004, 07:44 PM   #2
PlatinumZJ
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Quote:
Originally Posted by Larry02
Does it make any difference - performance - not worried about fuel economy because performance will override economy!
Are you talking about a K&N filter in a stock air box or their FIPK? I installed a K&N FIPK in my 97 ZJ w/I6 and can't feel anything during "normal" cruising. But I can tell a difference when I'm climbing a hill or acceleration on the interstae ramp. Of coure, these are just seat-of-the-pants observations after only about ten days of use.
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Unread 06-02-2004, 09:15 PM   #3
Meerkat
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Quote:
Originally Posted by Larry02
Does it make any difference - performance - not worried about fuel economy because performance will override economy!

I installed the filter in my 96 5.2L. While I know it is a much more effective filter than an O.E.M. filter, I have not noticed an increase in mileage or power. So I am installing a FIPK.

HTH
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Unread 06-02-2004, 09:36 PM   #4
Zeitgeist
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I have a '97 ZJ too; I'm thinking of putting some modifications in this "beast" soon.. even though I know nothing about cars...

I'm assuming it's a 6 cylinder car; despite the fact it accelerates slow... would a V8 say it?
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Unread 06-02-2004, 09:59 PM   #5
Meerkat
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Quote:
Originally Posted by Zeitgeist
I have a '97 ZJ too; I'm thinking of putting some modifications in this "beast" soon.. even though I know nothing about cars...

I'm assuming it's a 6 cylinder car; despite the fact it accelerates slow... would a V8 say it?
Usually there is an emblem on the liftgate that says "V8" on it. Also, if you open the hood, an inline 6 (I6) is pretty narrow, since all the cylinders are in a line. The V8 is much wider (pretty much fills the engine bay) because the cylinders are arranged in a "V" with 4 cylinders to a side.

Also, I think that on the V8 model, the speedo goes to 120 and on the I6 it only goes to 85.

HTH
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Unread 06-02-2004, 11:29 PM   #6
AZFlyingDiver
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Like others, my 96ZJ I6 4.0 definitely accelerated better and performed better uphill with the FIPK II. Gas mileage is marginally better (about a 0.6 - 0.8 MPG increase as best I can figure). I do plan to get a catback, and bore out the throttle body to 62mm for even better performance...
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Unread 06-03-2004, 08:58 AM   #7
Zeitgeist
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that's weird, my speedometer goes up to 120mph, and i've seen, when it was my sister's, have it brought up to at least 110mph; but there's no 8 cylinder mark on it... seems kinda slow for a 6 cylinder, too.
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Unread 06-03-2004, 01:11 PM   #8
Bob K
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Independent dyno results show a 5 - 7 hp difference depending on the engine you have. A lot of seat-of-the-pants estimates are likely to be inflated due to the difference in sound. It's a good mod, especially if you can get one for a good price. In fact it's sort of a "must have" item if you ask me. Just for the sound and the "coolness factor".
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JuiceBox ignition
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K&N Filter
Custom Rock Guards
Turbo Muffler
Rear Track Bar in the shed
Other Tricks I won't tell to just anybody!

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Towing Package
K&N FIPK
ProComp MX6 shocks
Borla Exhaust
Tow Hooks
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Unread 06-03-2004, 02:49 PM   #9
greasefingers
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I do not believe you will gain anything much without doing other things in conjunction with this, like increasing diameter size of the exhaust system & stuff. Basically the engine is a vacuum pump. You can not get any more air into it without a pressurized intake system (turbo/supercharge). Thatís why they were developed. However you could remove your stock air filter and go for a test drive to see if you feel anything different. Increasing the fuel efficiency by adding a better filterÖnot. Lets say it does increase the hp by a couple, then the claim to increase hp & fuel economy is something that just sounds to good to be true even with a straighter tube (fipk) I have to agree that is a really cool looking mod. Just my 2-cents.
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88 Cherokee 2-door with 5speed manual 139K miles(deceased) purchased new
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Unread 06-03-2004, 03:45 PM   #10
Bob K
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The air pump example is a good one. The recommendation to drive without an air filter is flawed not only because of the lack of the smooth intake with the tube, but lack of cold air as well.

Dino Savas has posted the horsepower gains of various accesories. He measured them with a dyno.

2.5 I4 (Factory ratings 120hp@5400rpm/140lbft@3500rpm)

1. Cold air intake (CAI) with 5" Powerstack cone filter
2. 4.0 TB with taper bored to 60mm
3. Poweraid TB spacer bored to 60mm
4. Intake manifold heatshield
5. Flowmaster 50 series 2.25" muffler
6. High-flow cat
7. Clifford Performance header with 2.25" piping
8. Champion copper plugs
9. Magnecor 8.5mm plug wires
10. Electric fan conversion
11. Relocate IAT sensor to CAI
12. 21lb/hr 4.0 injectors
13. Ported stock cyl. head
14. Mopar Performance 256*/256* camshaft

With the package of mods listed above, outputs should improve to about 160hp/180lbft.

3.7 V6 (Factory ratings 210hp@5200rpm/235lbft@4000rpm)

1. Magnaflow 2.5" cat-back exhaust: 22hp/31lbft
2. K&N panel filter: 2hp
3. K&N Aircharger: 4hp
4. ASE chip: ?
5. Kenne-Bell supercharger: 81hp/96lbft

The 3.7 V6 produces 155.5rwhp/184.5rwtq in stock form on an automatic KJ. That's 194hp/231lbft at the flywheel (20% drivetrain loss).
On a 5-speed manual KJ, it produces 166rwhp/193rwtq. That's 195hp/227lbft at the flywheel (15% drivetrain loss).

4.0 I6 (Factory ratings 180-195hp@4600-4750rpm/220-235lbft@2400-3950rpm)

1. K&N FIPK: 7hp (XJ/WJ), 12hp (YJ)
2. Bored 62mm TB: 3hp
3. Bored 62mm TB spacer: 2hp/3lbft
4. Intake manifold heatshield: ?
5. HP plugs: 0-2hp
6. Splitfire plug wires: 3hp/6lbft
7. Dynomax Super Turbo cat-back exhaust: 7hp/9lbft
8. High-flow cat: 2hp
9. Tri-Y header/S-pipe: 10hp
10. JET Stage 2 PCM: 8hp (auto. trans.)
11. Speedtweaks IAT adjuster: ?
12. Electric fan conversion: 3hp/3lbft

With all the external bolt-ons listed above, output should be about 225-230hp. Beyond that, internal engine mods or forced induction are needed:

13. Ported stock cyl. head: 11hp/4lbft
14. Accurate Power big valve head: 16hp/7lbft
15. Crane #753901 camshaft: 10hp/15lbft
16. Raise CR from 8.8 to 9.5:1: 8hp
17. Accurate Power 4.6L stroker engine: 75hp/105lbft over stock
18. Accurate Power supercharger: 85hp/90lbft over stock
19. Nitrous Express kit: 50-75hp/90-135lbft over stock

4.2 I6 (Factory ratings 115hp@3200rpm/210lbft@1800rpm)

1. 2.5" catn'back exhaust
2. Borla header
3. Ported 4.0 head milled 0.010" for flatness and higher CR
4. 4.0 TB with taper bored out to 60mm, EFI, distributor, fuel pump, and computer.
5. Homebrew intake with Powerstack cone filter
6. Bored 62mm Poweraid TB spacer
7. Electric fan conversion
8. Crane #753901 camshaft.

With the package of mods listed above, outputs should improve dramatically to about 230hp/290lbft. That's double the HP output of the stock carbed 4.2 engine!

4.7 V8 (Factory ratings 235hp@4800rpm/295lbft@3200rpm)

1. K&N FIPK: 8hp
2. Brian Stroud's RamIT cold air intake: ?
3. Kolak 3" cat-back exhaust: 5hp/6lbft
4. Modified Y-pipe + 3" high-flow cat: 10hp
5. Mopar Performance PCM flash: 9hp/8lbft
6. ASE chip: -6hp/26lbft
7. Kenne-Bell Optimizer II: 10hp/9lbft
8. Flometrics 70mm TB: 5hp/7lbft
9. Speedtweaks IAT adjuster: ?
10. KRC Performance HO camshafts & intake manifold: 19hp
11. Remove clutch fan + short belt PS/alternator bypass: 10hp/17lbft
12. Duner's fuel rail cooling system: 16hp/29lbft

With the above mods, output should be about 300hp. Now the big stuff:

13. Kenne-Bell supercharger: 99hp over stock
14. Paxton Novi-1000 supercharger: 102hp/62lbft over stock
15. Garrett T04B turbocharger 10psi boost: 144hp over stock
16. Nitrous Express kit: 50-150hp over stock

4.7 HO V8 (Factory ratings 265hp@5200rpm/325lbft@3600rpm)

1. K&N panel filter: 3hp
2. K&N FIPK: 7hp
3. Brian Stroud's RamIT cold air intake: ?
4. Kolak 3" cat-back exhaust: ?
5. Modified Y-pipe + 3" high-flow cat: ?
6. ASE chip: ?

5.2 V8 (Factory ratings 220hp@4400rpm/300lbft@3200rpm)

1. K&N FIPK: 13hp
2. Mopar ECU: 16hp
3. Kolak 3" catn'back exhaust: 13hp
4. Mike Leach headers/Y-pipe: 14hp
5. Autolite 3924 plugs: 3hp
6. Ported TB: 7hp/10lbft
7. Electric fan + ASP crank underdrive pulley: 8hp/9lbft
8. Speedtweaks IAT adjuster: 8hp

With the above mods, output should be about 295-300hp. Now the big stuff:

9. Mopar 2bbl MPI intake: 25hp/1lbft
10. Magnum R/T Stage 2 heads + CompCams 254HR-12 hydraulic roller camshaft + 1.7 roller rockers: 95hp
11. Vortech supercharger 89hp/65lbft over stock
12. 390ci stroker engine 215hp/190lbft over stock 5.2
13. Nitrous Express kit 50-150hp over stock

5.9 V8 (Factory ratings 245hp@4000rpm/345lbft@3200rpm)

1. K&N FIPK: 16hp
2. Mopar ECU: 9hp
3. Kolak 3" catn'back + Mike Leach headers/Y-pipe: 30hp
4. Kolak ignition upgrade: ?
5. MSD 6A ignition + Blaster SS coil: 4hp
6. Fastman TB 11hp/17lbft
7. Speedtweaks IAT adjuster 7hp/6lbft
8. Mopar 2bbl MPI intake + Crower 1.7 roller rockers: 29hp/-7lbft

With the above mods, output will be about 325hp/410lbft. Now the big stuff:

9. Magnum R/T Stage 2 heads + Hughes Engines HER2228AL camshaft: 83hp/21lbft
10. Vortech supercharger 95hp/60lbft over stock
11. 408ci stroker engine 195hp/165lbft over stock 5.9
12. Nitrous Express kit 50-150hp over stock
__________________
'87 Wrangler YJ 4.2 I6 (sorry, sold)
JuiceBox ignition
2 1/2" ProComp Lift
31" BFG A/T's
K&N Filter
Custom Rock Guards
Turbo Muffler
Rear Track Bar in the shed
Other Tricks I won't tell to just anybody!

'99 Grand Cherokee 4.7 V8
Towing Package
K&N FIPK
ProComp MX6 shocks
Borla Exhaust
Tow Hooks
Alpine CD with Infinity+iPod connect
Just getting started!

If you're not living on the edge...
you're taking up too much space.

Last edited by Bob K; 06-03-2004 at 03:51 PM..
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Unread 06-03-2004, 08:28 PM   #11
greasefingers
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That is an extensive write-up. I am sure that everyone will appreciate that. Good job.
One word of caution: donít believe everything you readÖeven my words Greater hp from spark plug wires...never.

The bottom line is that it takes $$$ invested in mods to realize any significant increase in hp. No one add-on will do it for you. Personally I would like to improve the handling of the jeep before looking at straight line hp. I would love to put on dual piston front brake calipers and increase the diameter of the sway-bars; to tighten things up. Mods are like pizza: your favorite pizza joint is not your friends favor choice. In other words, if you buy something that you feel good; then itís worth it no matter if it improves things or not.
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94 Black Laredo 4-Liter with QuadraTrac (42RE trans & NP249 TC) 200,000 + miles purchased new

88 Cherokee 2-door with 5speed manual 139K miles(deceased) purchased new
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Unread 06-05-2004, 12:09 PM   #12
redline
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I was told from the Jeep dealer that a new bigger throttle body spacer and just a K&N filter in your stock box will do just as good as a cold air intake. wether this is true or not i have no clue? but i think he was just trying to sell me some over priced mods, like a new throttle body spacer for 98$ and a filter for 76$ which is crazy if ya ask me i rater wait and save a little cash and get the cold air intake
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Unread 06-05-2004, 01:12 PM   #13
resevordg
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Good Deal

I put a K&N on my 98 ZJ 5.2L and it is a good thing. Better Exeleration and it sounds a bit cooler. if your going to open up your exhost at all then you should do it just make sure you get one with a heat shield (cold air intake) the colder (more dense) air will also give you boost. some people i know have gone so far as to add insulation to there heat sheild as well. not a bad idea. in any case no one in mod world will take you seriously if you dont have at least that much done. then next thing you need after that is a nice loud wide open exhost.
have fun
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Unread 06-05-2004, 04:16 PM   #14
Marksman
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I know that K&N boast both increased performance and better filtration than a "paper filter". What are your opinions on the claim of better filtration?

K&N even claims that their filters do better the dirtier they get because the "dirt acts as a filter". I've never let either of my K&N air filter's get dirty, but I was just wondering if a new, well-oiled K&N filters as well as a new paper filter.
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Unread 06-05-2004, 06:21 PM   #15
Meerkat
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Quote:
Originally Posted by Marksman
I know that K&N boast both increased performance and better filtration than a "paper filter". What are your opinions on the claim of better filtration?

K&N even claims that their filters do better the dirtier they get because the "dirt acts as a filter". I've never let either of my K&N air filter's get dirty, but I was just wondering if a new, well-oiled K&N filters as well as a new paper filter.

I used K&N's on my motorcycles years before they became available for cars and trucks. My observation is that any filter that uses a wet element (such as oil) is more effective at trapping dirt than a dry filter. The K&N filter has the added advantage of being washable as well. If you operate in a dirty environment, the ability to wash your filter and keep using it quickly offsets the higher initial cost of the K&N over a paper filter.
A filter, in order to let air through, has to have holes in it. A paper filter, by nature, is going to have pretty straight, large holes in its material, foam, on the other hand, is thicker than paper, which allows the air holes through the material to be longer and more convoluted. If we consider the path that air has to follow through the two media, then factor in the stickiness of oil in the foam, I think it becomes readily apparent that the K&N is much more effective at filtering than paper.

Just my .02...

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