General Intake / Exhaust Mods

zueslewis · July 2003

All facts are is a "certified opinion" - someone's opinion of an event or action that has been believed by one or more persons. I don't want to debate this any longer - if you don't like the product, don't buy it. If you don't like my opinion, discount it.

That's the American way. I'm a K&N fan, some are not - no big deal either way.

tidester · July 2003

Let it go!

Thanks.

tidester, host

bigfur · September 2003

Has any one put a full intake system on a 5.3 engine, and has it inproved power at all?

elmoblatch1 · September 2003

I am trying to improve the MPG on my 3.7L Jeep.

Will a K & N air filter help ?

How much does it cost ( approx ) ?

Can I purchase one at a a local parts store ?

What makes this filter better at saving gas than an original equipment air filter ?

Thanks in advance-

zueslewis · September 2003

than a paper filter, but truly, any fuel economy savings would be marginal and only detected on a dyno - I'm a K&N fan, but I'm not about to tell you that you're going to get 2-3 mpg better - you're just not.

stever · September 2003

If K&N's helped your mpg, wouldn't they advertise it on their site? They don't....

Steve, Host

zueslewis · September 2003

mpg improvement at 6,000 rpm or something.

Unlike the "Tornado", K&N doesn't make up ficticious dyno results or make wild claims.

I have K&N filters in my cars because they flow better, I never replace them, and they gave me cool stickers for my quarter windows.

elmoblatch1 · September 2003

Thanks for your posts & the link to the K & N web site. I have a 98 Honda Civic that is about due for a new air filter....I think a K & N is in order. Reading the testimonials, most appear to show improved gas mileage.

Sounds like you do not think much of the Tornado.

zueslewis · September 2003

is a joke - advertising gimmick, like taking a pill and losing 2 pounds a day while you eat anything you want.

stever · September 2003

I suggest you keep close track of your mpg for a few tanks and then track it with the K&N. We'd be curious to see what differences you see. Hopefully your current paper one isn't clogged up so much that it'll slew the baseline.

Steve, Host

elmoblatch1 · September 2003

I just ordered K & N filters on line for both of my vehicles. I do closely monitor mpg & will report back here after the filters are installed.

I was able to get free shipping & a lower price than the auto parts stores near my house.

Thanks again for your help-

zueslewis · September 2003

where'd you get them?

elmoblatch1 · September 2003

Direct Source Outlet in San Diego

I think the website is:

www.ajusa.com

1-800-877-1911

zueslewis · September 2003

just got another car in the family...

ksuwildcat001 · September 2003

I picked up 2 to 3 mpg when I installed a K&N intake kit on my 2001 Cougar.

A coworker had similar gains when he bought a K&N intake kit for his Explorer.

Just thought I'd let everyone know what we have experienced. Our experiences were with the full K&N intake kits though instead of just a K&N filter.

elmoblatch1 · October 2003

Just received K & N Air Filters via UPS today. I have a question: Do I need to disconnect the battery to re-calibrate anything ?

The instructions make no mention of this, but I thought I read somewhere that the engine computers need to adjust to the increased airflow.

zueslewis · October 2003

I'd recommend it, but it's not mandatory. It'll adjust quicker if you disconnect, versus "learning" the airflow difference on its own.

elmoblatch1 · October 2003

I would like to get your response to a post yesterday on the Jeep Liberty message board by div2 regarding the negative aspects of K & N air filters.

stever · October 2003

There's no evidence that I've seen, other than testimonials, that a K&N air filter will improve mpg. If it does, point me to the language on their web page please.

Rumors abound about studies done by manufacturers (usually Mercedes) that the K&N can let more dirt into the engine, but I haven't seen any of those either.

Occasionally you'll read about someone having to replace a MAP or O2 sensor because of oil fouling. K&N fans attribute this to sloppy oiling of the filter.

I personally prefer to just pop a paper filter in every 15,000 miles or so and not have to fool with oiling up the filter. I'm frugal but I don't think the payback with a K&N is quick enough or low maintenance enough to justify switching from the $8 paper filter I can get at Wally World. Just my opinion, ymmv.

Steve, Host

elmoblatch1 · October 2003

on my 2003 Jeep Liberty. I will report back on performance & gas mileage observations.

bigfur · October 2003

be putting on a FIPK (also known as the full intake, not just the filter) on my 01 Silverado 1500 5.3 in a few days. let you know what i find out.
tom

obyone · October 2003

at certain rpms, and whistling at low rpms.

bigfur · October 2003

im not sure ill notice with the straight pipes on the back side.

ksuwildcat001 · October 2003

I don't have any whistling on my Cougar. It did give it a nice growl when I get on it though. The biggie for me was not having to buy new filters all the time. Like I said in an earlier post, I was also lucky enough to notice a mileage increase after installing the complete K&N kit.

obyone · October 2003

Bigfur. You may or may not hear the whistling. The people on the street or where ever you're idling will. Course if you walk outside of the truck or drive with the windows down. You'll hear the whistling. I was wondering what that was until I read about on another GM truck forum.

bigfur · October 2003

unlike most morons who have trucks like mine, i also run mufflers. Im 6'5" so im not too big on sports cars. Love the truck, just like it to perform as well as it looks. Im putting it in tomarrow im make sure to let ya know what i think.

bigfur · October 2003

suppliers...ok not getting my new intake till friday, ill let you know how it goes.

obyone · October 2003

my Silverado. It came with a heat deflector and a k&n cone filter. They now offer a replacement for the stock airtube which I bought for slightly over $100. Since I had installed the K&N FIPK on the Silverado, I took the Airaid setup and installed it on my 2002 Denali. The resonance is far worse than the K&N FIPK. So out goes that tube and in goes the stock tube. So much for their design.

stever · October 2003

There are a couple of bugs in our board software, and not being to search on "&" is one of them.

We thought about renaming this discussion to K AND N but that probably would make things worse... maybe K&N will rename themselves to KNFilters like their web link one day and solve the problem for us.

Glad you were finally able to find us!

Steve, Host

bigfur · October 2003

have my FIPK (or the full intake) installed in my 01 5.3 chevy silverado. Did it last night and i noticed a differance right away. I think i may notice more of a differance than the average person who puts it in since i also have a performance exhaust system in my truck. Have to wait a bit for the mileage results but i will let you know them when i get them.

elmoblatch1 · October 2003

Installed on my 2003 Jeep Liberty Sport with 2,600 miles on it. After 10 days, no noticeable improvement from the 17-18 mpg that I was getting before.

mdey · October 2003

I have a 4x4 Explorer, 92 vintage. Great beater truck I use for hunting and yard work. My son drives it to school.

A couple of years ago I was doing some towing, total load was in the 2000-pound range. I made several 200-mile one way trips. The truck is long-legged with a 3.27 rear end. Anything heavier than an empty trailer and overdrive is out. The problem is that the engine would be quite buzzy above 2500 rpms (about 65 mph in Drive (not OD)). Not much fun cruising at 65 mph when you have 200 miles ahead of you.

I installed a simple K&N filter charger, about $40 at the local auto parts place. I didn't notice an overwhelming increase in power, although the engine is a little more spirited when accelerating. I also didn't notice any improvement in mileage.

However, I did notice a dramatic improvement in towing ability. I still tow in Drive (not OD), but the engine is now smooth and strong at 75 mph (2800 rpms). The engine is no longer buzzy above 2500 rpms.

elmoblatch1 · October 2003

Still no improvement in mpg. I have not taken the Jeep on a highway trip as yet. I cannot say that I notice any major improvement in performance either since I really don't beat on the truck that much. Perhaps more miles are needed for break in. The Truck is rated 17 city & 21 highway. I drive about 30 miles a day & get consistently 17-18 mpg in 2WD.

I think you said that your highway mileage improved 4 mpg to 22....isn't that what a Liberty is supposed to get anyways ???

bigfur · October 2003

so far no vast improvments in fuel mileage...probably cuz im having too much fun with the new power. Power has definatly gone up, dont ask for numbers cuz im not a dyno myself so i couldnt tell ya. Has made my exhaust sound better though. Overall i love it so far ill keep you updated if i see an improvment in mileage.

bigfur · October 2003

MOST* (note the astrik for people who do) people dont drive a vehical JUST for MPG. I drive my truck cuz i like it, as im sure most people here do. I cant really comment on any MPG gains yet, im still a lil lead footed with it just cuz its a new toy and lots of fun lol.

bigfur · November 2003

no MPG change, but that has more to do with not keeping my foot outta of the gas.

elmoblatch1 · November 2003

I pulled the K & N air filter after a month of normal driving...no improvement in MPG. If anything, the mileage was lower. I never hit better than 17 & had a couple tanks in the 15-16 range.

I put the stock filter back in for now. The Liberty has 3,400 miles on it & the dealer says that it should be broken in by now.

I am changing gas stations to see if that makes any difference.

I have a trip coming up & will try the stock filter one way & the K & N on the way back. That is about as controlled an experiment that I can come up with.

driftracer · November 2003

that after owning 6 or 7 K&N equipped vehicles, I would never claim that they improve mileage. In fact, mileage may suffer because I stick my foot in the firewall to hear the cool intake sound with the higher-flow filter.

There are slight performance gains.

My biggest issue is the cost savings - a Toyota that I owned used air filters that were $16 (Wal-Mart) for a Fram and $24 at the dealer for a Toyota filter.

I paid $28 for a K&N a few weeks after buying the car and never changed the filter - I just cleaned it a re-oiled it at every oil change. In 6 or 7 vehicles, also, I've only been through two cleaning and oiling kits.

In the Toyota alone, figuring on changing the air filter every 10,000 miles, and I kept it for 98,000 miles, I saved $130 or so.

Hey, it's $130 I wouldn't have had otherwise.

driftracer · November 2003

I put a K&N cold air set up (full intake) on my drift car and I LOVE the sound. Add that to a new high-flow cat and custom bent 2.5" exhaust and canister muffler, and the thing really rocks.

Sounds mean when you're next to the wall at the Wendy's drive-thru.

I probably only gained 10-15 hp with everything, but it's burning cleaner than it was and the sound and power difference make huge personal reasons for making the changes.

elmoblatch1 · November 2003

I am not giving up on the K & N filter, but I need to make sure it is not bad gas first. So, I am re setting the table by putting the stock filter back in place. Then I will buy gas at various stations to see if that makes a difference. Once I determine if that is a factor, I will be ready to try both filters on the 500 mile round trip.

Question, will it take the engine long to adjust on that trip when I fill up & put the K & N filter in for the trip home ?

ksuwildcat001 · November 2003

You can speed up the adjustment period by disconnecting your battery for 15 to 30 minutes.

stever · November 2003

The only thing you'll find about improved gas mileage on the K&N site may be testimonials. Last I looked K&N doesn't promote better mpg themselves (otherwise the FTC may take an interest and make them prove it).

Heck, you can improve your mpg 10% just by replacing your clogged air filter - and that's probably one reason for the testimonial stuff.

"Gas-Saving" Advertising Claims

Steve, Host

bigfur · November 2003

Well i must admitt there was NO gain in mpg with the full intake in place...but there is a hellova lot more power under my right foot. Truck dosent downshift outta overdrive as often either so its making my tranny last a lil longer. My mpg have not gone down any since i installed it nor has it gone up, i consider that good being that i have my foot into it a lil bit more now. Overall i love it right now and just have to get a filter bag for it now before my long haul move. If i missed something please ask me too.
Tom

stever · November 2003

Just to clarify, my comments were directed at the air filter only.

Steve, Host

bigfur · November 2003

no improvment in MPG, but still lots of power on tap. Must also note...mileage did not go down either.

elmoblatch1 · November 2003

Thanks for the posts.

I have not disconnected the battery when the K & N filter went in or when it came out.

How long should it take my 2003 Jeep Liberty engine to re-adjust to the new filter ?

KSU-PS

Thanks for Terrence Newman...we Cowboys fans love him !

driftracer · November 2003

Your Jeep should reset its perameters immediately after reconnecting the battery and driving. Adaptation only takes a couple of minutes.

bigfur · November 2003

bigfur · November 2003

To be perfectly honest i havent reset the computer yet. Im going to tomarrow when i do some other work on my truck, been too busy to this point to do it. Have to see what change that makes if any. Either way ill keep you all updated and see what (if anything) happens.
Tom

elmoblatch1 · November 2003

Thanks for your post. When I put the K & N air filter in originally, I did not disconnect the battery. Could that possibly explain why I got lower MPG (assuming no change in driving habits)

Also, since I put the stock filter back in last week, I did not disconnect the battery...should I do that now ?

Finally, how long do I need to leave the battery disconnected & why ( which terminal should I disconnect, both positive, negative ???)

Thanks in advance for your help.

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