cold air intake

[baseball_playa1575]

Hey I have a 1993 Jeep grand cherokee limited. It has the 4.0L I6. I do mostly city driving and a little bit of offroading, I get about 14.4 MPG(all city driving) I was wondering how much of an improvement of gas mileage anyone has gotten adding a cold air intake? I also want more horsepower which I am sure this would help but does anyone know how much of an increase it will add? Thanx

[dksob81]

Originally Posted by baseball_playa1575

Hey I have a 1993 Jeep grand cherokee limited. It has the 4.0L I6. I do mostly city driving and a little bit of offroading, I get about 14.4 MPG(all city driving) I was wondering how much of an improvement of gas mileage anyone has gotten adding a cold air intake? I also want more horsepower which I am sure this would help but does anyone know how much of an increase it will add? Thanx

I got about an extra .6 mpg increase on my 94 ZJ 5.2L, The horsepower was noticeable you could really feel the difference. The dyno sheet that came with the intake (K&N FIPK GEN II) showed 25.7 HP increase.

[turtlecrxsi]

Most likely you won't get anywhere near those gains with a CAI. Basically, it'll just make your intake louder. The rule of thumb is that you gain 1hp for every 5*+/- dropped in temperature.

I just added a K&N filter to my Jeep to free up flow and not have to worry about changing dirty air filters. The mpg gain is about what was previously stated... .6-1mpg improved. Logically, if you drive light footed, with a freer flowing air filter, the idea is that air can get to the throttle body easier thus causing less work for the engine to suck air in. So maybe the gains would be more the less foot you put into it but since you drive around town a lot, I doubt it. I know it really hasn't helped my mpg around town. Then again, I like to get moving as fast as I can without lollygagging...

[jeepgclwj]

If your going to do a CAI then do yourself a favor and make your own. You will save alot of money that way. If I had to do it again I would not have bought my K&N FIPK. I could build one that would work as well if not better. I ended up doing a somewhat custom job on my heat shield anyway. I get about 21-23 mpg on the highway at cruise set at 70. With some exhaust work done....

[Automotive_Fanatic]

in all honesty upgrading to a CAI is a great idea for the simple fact the your factory air intake and pretty much anything factory is going to be very restrictive. You will probably only see increases of about 10-12 hp doing this but you will see a much improved throttle response, and better milage depending on how you drive.

The reason why you will hear your intake better is cause of the fact that there is no usless plastic surrounding it, so the air flow is drasticly increased, thus creating a deep sound from the intake.

As far as cheap goes remember you get what you pay for.
going cheap is not always the best way to go. Trust me I learnt my leason many times over and now unless its name has been proven to be good I dont mess with it. Any true tuner will tell you that.

But see I am doing somthing different with my GC, everyone around here is jacking them up for mudding, I am lowering mine and adding the hp and tq.

[Automotive_Fanatic]

I pulled this directly off of K&N website.

Product Style: 57 Series FIPK
Estimated Horsepower Gain: 7.72 HP @ 4684 RPM
Type: Gen II
Replacement Filter: RC-4690
CARB Exempt: Yes
Weight: 10.4 lb (4.7 kg)
Product Box Length: 19 in (483 mm)
Product Box Width: 18.25 in (464 mm)
Product Box Height: 12.5 in (318 mm)

[jeepgclwj]

Make one yourself. It would be sooooo easy to do. You will spend 250 or so when you really only need to spend about 75 dollars.......

[dksob81]

wow the HP gain difference between the 4.0L and the 5.2: are huge.
K&N Website.

5.2L
57-1506-2 Product Specifications
Product Style: 57 Series FIPK
Estimated Horsepower Gain: 25.77 HP @ 4335 RPM
Type: Gen II
Replacement Filter: RF-1027
CARB Exempt: Yes
Weight: 11.1 lb (5 kg)
Product Box Length: 36.25 in (921 mm)
Product Box Width: 13.25 in (337 mm)
Product Box Height: 10.38 in (264 mm)

4.0L
Product Style: 57 Series FIPK
Estimated Horsepower Gain: 7.72 HP @ 4684 RPM
Type: Gen II
Replacement Filter: RC-4690
CARB Exempt: Yes
Weight: 10.4 lb (4.7 kg)
Product Box Length: 19 in (483 mm)
Product Box Width: 18.25 in (464 mm)
Product Box Height: 12.5 in (318 mm)

[jeepgclwj]

Originally Posted by dksob81

wow the HP gain difference between the 4.0L and the 5.2: are huge.
K&N Website.

5.2L
57-1506-2 Product Specifications
Product Style: 57 Series FIPK
Estimated Horsepower Gain: 25.77 HP @ 4335 RPM
Type: Gen II
Replacement Filter: RF-1027
CARB Exempt: Yes
Weight: 11.1 lb (5 kg)
Product Box Length: 36.25 in (921 mm)
Product Box Width: 13.25 in (337 mm)
Product Box Height: 10.38 in (264 mm)

4.0L
Product Style: 57 Series FIPK
Estimated Horsepower Gain: 7.72 HP @ 4684 RPM
Type: Gen II
Replacement Filter: RC-4690
CARB Exempt: Yes
Weight: 10.4 lb (4.7 kg)
Product Box Length: 19 in (483 mm)
Product Box Width: 18.25 in (464 mm)
Product Box Height: 12.5 in (318 mm)

No way your going to get 25 hp from a K&N Gen II FIPK. I am pretty sure with my FIPK and Kolak exhaust I lost power but it sounds alot better. I couldnt even get my Jeep to stock times in the 1320. Sell your Jeep and nbuy somehting that wants to go fast and not a slow ass Jeep.....

[dksob81]

Originally Posted by jeepgclwj

No way your going to get 25 hp from a K&N Gen II FIPK. I am pretty sure with my FIPK and Kolak exhaust I lost power but it sounds alot better. I couldnt even get my Jeep to stock times in the 1320. Sell your Jeep and nbuy somehting that wants to go fast and not a slow ass Jeep.....

Go here: http://knfilters.com/search/appsearch.aspx

put in the 1994 Jeep Grand Cherokee w/ 4.0L and look at part# 57-1520 right under the part # it give the HP gains
then put in 5.2L for the engine size and lookunder part# 57-1506-2

And if you didn't feel a difference, go get a new jeep with either the 5.2 or the 5.9 and put the K&N FIPK kit on and you WILL feel the difference on my old 94 when I put the new exhaust system on (FLOWMASTER) I didn't really notice a difference except for the sound but when I got the intake on you could deffinately feel the difference.

[Automotive_Fanatic]

I have noticed alot of people underestimate the potential of the jeep cherokee...heck I have seen a 92 caravan run quarters in 12 seconds! and thats a minivan...making your own is cheaper, with cheaper quality. its not a bad idea if you have a pipe bender, and the grinding tools needed for a smooth finish in the inside.remember, restriction comes from numerous things, from crappy bends to imperfections in the inside of the tube.

[baseball_playa1575]

I am looking at buying a used CAI from soemone with a cherokee. Does anyone know if it will fit onto the grand cherokee or can I use the filt then build a custom heat shield?

[turtlecrxsi]

I can't believe you people actually believe those gains posted by K&N's website. I've had K&N filters in a Porsche 944, a race prepped Honda CRX, my Jeep GC and my wife's VW 1.8t Passat. And I can honestly say that I've only felt gains in cold weather as I've stated previously (scroll up and read). The turboed VW doesn't even really see much of a gain even with full boost unless the temperature drops significantly. The reason why you get better mpg is because you're giving the engine less gas than normally because air is flowing into the intake plenum more efficiently with a less restrictive filter. The Jeep GC 4.0L doesn't have a very complicated air intake system so you don't need to spend hundreds of dollars for an intake. If you really want to ditch the stock intake system, remove the plastic piece that directs air flow from the front grill to the air box. Cut a hole in the stock air box on the bottom and put a K&N filter on it. You can clean your throttlebody too if you think it may be clogged. A metal pipe that is essentially the same diameter as the plastic pipe isn't going to make much difference; especially since it's only about a foot long to the throttle body...

[dksob81]

Well maybe if I didn't feel the difference (huge) I wouldn't believe it.
And you don't want to use a metal pipe because metal hold heat (will pick up any heat from the engine), that would just heat any air passing through the intake.
HA, maybe thats why your not feeling any difference with you intake your using a metal pipe for an intake tube (which is picking up heat from the engine and heating up the air going into the engine, so altho you getting a lil more air into the engine it's hot air so it's not making a big enough boom to feel anything.......

[turtlecrxsi]

If the above post was directed at me then you're mistaken because I just have a K&N filter in my stock intake.

If you are directing your response at jeepgclwj then you must remember it's winter time and heat soak isn't applicable this time of year...

Many people don't realize that on n/a cars or trucks one mod isn't going to make much difference. Now if you have an intake, header, full exhaust, perhaps a more agressive cam and pulleys even, and, of course, computer software upgrades, then you should get the full potential of the power increases from the mods on your vehicle.

F/I cars are a little more easier to make power from with intakes and exhaust etc. Add the other mods mentioned above as well as a boost controller and some other goodies and the car will definitely make power.