: Adding a K&N to 97 N*



Wicho
10-01-04, 06:46 PM
I was thinking of adding a K&N the next time I have to replace the air filter. What are the pros and cons in doing this ? I would belive it would be beneficial because it would let more air into the engine so the engine would be running more effeciant meaning better mpg. I am worried that it would make the engine louder, but am not sure on how loud it would be. Also, I was also thinking of adding an exhaust system, not for a louder engine but for a better breathing motor. I would like a little rumble but when I mean little I mean VERY little rumble, I don't want my car to sound like a muscle car. Any suggestions or opions would be great.

Eldyfig
10-01-04, 08:00 PM
I have a K&N panel filter in. I like the fact that I will not have to buy another air filter. It may have cost me $50, but I have had the car for 2 years now and plan to keep it for at least another 3 years. The panel filter isn't going to cause a considerable amount of noise. If you installed a cone filter, you would then probably hear more. It would be best to get the filter and couple it with an upgraded exhaust.

drewb612
10-01-04, 08:09 PM
I have a K&N panel filter in. I like the fact that I will not have to buy another air filter. It may have cost me $50, but I have had the car for 2 years now and plan to keep it for at least another 3 years. The panel filter isn't going to cause a considerable amount of noise. If you installed a cone filter, you would then probably hear more. It would be best to get the filter and couple it with an upgraded exhaust.
what model filter goes with the 97 northstar?

growe3
10-01-04, 08:24 PM
K&N air filters have been tested by a number of our forum members and generally have not provided any gains in power.

While there may be an exception somewhere, as yet I have not seen anyone produce any dyno charts to show before and after data that would attest to hp gains.

The Northstar seems to have a very adequately sized intake filtering system and does an excellent job.

That being said it is fun to customize, but there doesn't seem to be any "free" performance gains here.

See links below for some test results.
http://www.cadillacforums.com/forums/showthread.php?t=17557

http://caddyinfo.netgetgoing.com/airboxvscone.htm

Wicho
10-01-04, 09:14 PM
If I decide to buy a set of mufflers, would it make a big difference if I just buy the muffler and not the whole exhaust system ? I would like to increase mpg and add a little rumble to my car but I don't want to spend a fortune. WIll just buying a set of mufflers be enough ? thanks

Eldyfig
10-01-04, 11:43 PM
But having a washable, reusable filter that will outlast any paper filter for a one time cost of 50 some bucks and the little extra breathe it allows for the engine sure attracts me. When I purchased a K&N filter, I wasn't looking for a specific hp gain. If it helped a little, fine. What is 5-10 hp when you already have 270-300. And why dyno a cadillac that is used for daily driving?!

Edahall
10-01-04, 11:52 PM
Pro's - None

Con's - Doesn't filter as well resulting in increased wear
Doens't flow as well resulting in decreased power

Edahall
10-01-04, 11:55 PM
If you want to read more, go to:

http://forum.thedieselpage.com/cgi-bin/ultimatebb.cgi?ubb=get_topic;f=3;t=007856;p=

Here's the article:

On another diesel forum the members banded together to conduct an independent study regarding air filters for the Duramax Diesel. There is a lot of marketing hype surrounding certain aftermarket air filters and we wanted to know if the filters could stand up to their claims. Claims of "superior" filtering ability and dirt holding capacity are among some of these claims. Additionally, many filters are claimed to allow for "better" air flow giving you more horsepower.

This claim of better flow giving more horsepower is a debate all its own, but dyno tests run with a paper filter vs. NO FILTER AT ALL have shown NO INCREASE IN POWER OUTPUT. Therefore a filter with "better flow" will not only give you no increase in performance, it will also let in a lot of dirt while doing it.

The following data is provided by Testand Corp. in Rhode Island. Testand makes the $285,000 machines that perform the SAE J726/ISO 5011 air filter test standard. Any air filter that wants to be tested for performance and efficiency uses this test. These tests cost $1,700 per filter when done by an independent laboratory. Testand Corp. was interested in the comparison study and agreed to do the study for us.

Every filter listed was tested in an identical manner according to the SAE/ISO test standard> Here are the results:


In the order of EFFICIENCY (ability to filter dirt) the results are as follows:

FILTER % EFFICIENCY

AC Delco OE 99.93%
Baldwin paper 99.72%
No name pargain paper 99.32%
AFE Pro Guard 7 panel filter 99.23%
WIX/Napa Gold 99.03%
Purolator paper 98.73%
Amsoil, new style 98.63%
UNI 97.93%
K&N 96.80%


FLOW RESTRICTION from best to worst. Remember, 27.7 inches of water = 1 psi. So, 1 inch of water = .036 psi. The worst (AC Delco) at 6.23 in. water and the best (K&N) at 4.54 in. water is a difference of 1.69 in. of water or a "whopping" .0608 psi. Virtually negligible.

In order from least restricive to most:

FILTER RESTRICTION in inches of water

K&N 4.54
Mystery bargain 4.78
AFE Pro Guard 4.99
Purolator 5.05
WIX/Napa Gold 5.06
UNI 5.40
Baldwin 5.71
Amsoil 5.88
AC Delco 6.23


DIRT HOLDING CAPACITY. From best to worst. This is the AMOUNT of test dirt it took to create an ADDITIONAL 10 inches of restriction. At that point the test is terminated. This is an indication of HOW LONG a filter is good before it must be cleaned or replaced.

FILTER Dirt Holding Capacity

AC Delco 573.898 grams
WIX/Napa Gold 447.366 g
Purolator 388.659 g
Baldwin 388.154 g
UNI 374.638 g
Mystery bargain 350.402 g
AFE Pro Guard 7 232.516 g
K&N 211.580 g
Amsoil 196.323 g


TOTAL DIRT PASSING THE FILTER DURING THE TEST. This is how much dirt your engine will take in if you use the filter for the duration that would cause the filter to become "dirty" enough to need replacement or cleaning. The "Dirt Passing The Filter" is the dirt collected by the "POST FILTER" during the SAE/ISO test.

In order from best to worst, the filters performed as follows:

FILTER DIRT IN GRAMS PASSED

AC Delco 0.4g
Baldwin 1.1g
AFE Pro Guard 7 1.8g
Mystery bargain 2.4g
Amsoil 2.7g
WIX/Napa Gold 4.4g
Purolator 5.0g
K&N 6.0g
UNI 7.9g

NOTE: During the test the Purolator was reported to have had a seal failure which gave it higher than expected dirt passing.

Eldyfig
10-02-04, 01:15 AM
This claim of better flow giving more horsepower is a debate all its own, but dyno tests run with a paper filter vs. NO FILTER AT ALL have shown NO INCREASE IN POWER OUTPUT. Therefore a filter with "better flow" will not only give you no increase in performance, it will also let in a lot of dirt while doing it.


Without a less restrictive exhaust, of course the engine won't get more airflow in. And, a special air filter alone will not give you any significant hp gain. You would need to open up the exhaust side.



In order from least restricive to most:

FILTER RESTRICTION in inches of water

K&N 4.54
Mystery bargain 4.78
AFE Pro Guard 4.99
Purolator 5.05
WIX/Napa Gold 5.06
UNI 5.40
Baldwin 5.71
Amsoil 5.88
AC Delco 6.23


How does it not flow as well resulting in decreased power? The test says it is the least restrictive. It must be less restrictive if it is letting that little bit more dust through.

In the last two tests, how does the K&N let so many grams of dirt pass through, but causes additional restriction with less dirt? Seems like a contradiction.

Can you repost the link to the article? It isn't working.

drewb612: model #33-2086

Edahall
10-02-04, 03:51 AM
Lets see if this works:

http://forum.thedieselpage.com/cgi-bin/ultimatebb.cgi?ubb=get_topic;f=3;t=007856;p=

drewb612
10-02-04, 03:02 PM
Without a less restrictive exhaust, of course the engine won't get more airflow in. And, a special air filter alone will not give you any significant hp gain. You would need to open up the exhaust side.



How does it not flow as well resulting in decreased power? The test says it is the least restrictive. It must be less restrictive if it is letting that little bit more dust through.

In the last two tests, how does the K&N let so many grams of dirt pass through, but causes additional restriction with less dirt? Seems like a contradiction.

Can you repost the link to the article? It isn't working.

drewb612: model #33-2086


thanks!!

Ranger
10-03-04, 01:16 PM
A few thoughts.
1. The absolute least restrictive is no filter and I believe that has been proved to produce no gains.

2. The factory set up will help prevent hydolocking should you inadvertently drive through very deep standing water. Not very likely but you have to ask yourself if it is worth the risk.

3. If you look under the air filter, beneath the air box, you will see the PCM. It was placed there so the intake air would cool it. By rerouting your intake air, you run the risk of overheating a very expensive component.

Wicho
10-03-04, 08:09 PM
I guess it's safer to just leave the stock air filter on and invest my money else where. How about a nice set of mufflers ? I don't want to buy a whole exhaust system, just the mufflers. Would this give me the LIGHT rumble I want ? What do you guys recommend ?

Mikethegreeat
10-04-04, 02:24 AM
dynomax mufflers, super turbos to be exact.

Eldyfig
10-04-04, 08:26 AM
part #028917733. This will open the back end of the exhaust system to 2.5".

drewb612
10-04-04, 10:21 AM
part #028917733. This will open the back end of the exhaust system to 2.5".

is this the muffler number?

Eldyfig
10-04-04, 01:15 PM
That is the part # on my receipt from Jegs.com. Cost was about $30 each. The muffler # is 17733.

Wicho
10-04-04, 04:49 PM
Is there anywhere I can go online to be able to hear how it would sound on my car ? I heard the corsa mufflers and they sounded great, wanted to know if these are as good.

Wicho
10-04-04, 05:00 PM
Never mind, found a site

MightyBright1
10-04-04, 11:12 PM
I have had a K&N on my suburban for 3 months. I will swear there was a differnce in performance. I recently cleaned it and found that it was mostly black and not very dirty. I recently changed the the filter in my 98 seville and could not belive the dirt on the element. The kind of dirt I used to find on the suburban elements. I don't think that the K&N holds the dirt unless you are willing to clean and re-oil it on monthly basis, if that. I am going to change my suburban back to an eliment filter because I don't think that the K&N can hold with a wire mesh.

Eldyfig
10-05-04, 12:15 AM
On the K&N box, it says the dirt holding capability increases as it builds up, but does not significantly decrease its flow. Who knows anymore...I will not admit if I have been had. I am a man...rrrgh. In case of doubt, make it sound convincing.



Never mind, found a site

Where is that site? I want to know if it does any justice.

Wicho
10-05-04, 10:23 PM
The official dynomax website has a recording on their site

etcCanuck
10-06-04, 02:31 AM
I don't think that the K&N holds the dirt unless you are willing to clean and re-oil it on monthly basis, if that.

...and the oil used to lubricate the k&n has been linked to MAF sensor failure. An expensive part that causes problems when not working properly....

Eldyfig
10-06-04, 10:13 AM
I am in the clear on that. My model doesn't have a MAF screen/sensor.