K-N air or oil Filter? Anybody try these? - The Saab Link Forums

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Old 08-06-2009, 01:34 PM   #1
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K-N air or oil Filter? Anybody try these?

Would be curious to find out if anybody here tried a K&N Filter in their 9-5?
All comments would be appreciated.
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Old 08-06-2009, 01:36 PM   #2
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Try these:

https://saablink.net/forum/search.php...=1960316&pp=25
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Old 08-07-2009, 09:10 AM   #3
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i have the k-n replacement high flow air filter for the stock air filter. not the open air intake. i like it, car seems to pull better and run better.
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Old 08-07-2009, 10:58 AM   #4
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we found that on a dyno the K&N filter cost 3 hp over a regular paper filter on our race car.
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Old 08-07-2009, 11:54 AM   #5
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Quote:
Originally Posted by Moonracer View Post
we found that on a dyno the K&N filter cost 3 hp over a regular paper filter on our race car.
Was this with just a k&N filter or with an open intake?

I'm not doubting what you're saying, but isn't 3hp too small to attribute to one thing? I would believe it if you did 20 runs, did an average, then replaced the air filter with the K&N, did another 20 runs, took a new average, and found the 3hp loss. To me though, something like 3hp is so small that it's probably not statistically significant at all. I also wonder if a car would need a certain amount of time to "adapt" to any changes the air filter might cause. Interesting...
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Old 08-07-2009, 12:02 PM   #6
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The newer stock Saab air filters are supposed to flow just as well as the K&N, but obviously can't be cleaned and re-oiled. I have the K&N drop-in replacement and it hasn't given me any trouble, but I don't think it helped any either.
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Old 08-07-2009, 12:04 PM   #7
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Yep. K&N is in mine.

Keep in mind however, that given the "smarts" of T7, changing the filter won't gain you anything in terms of power or torque. The ECU is set to produce a specific torque number, and will do all it can to get there in a WOT state. What you'll experience, perhaps, is getting to that torque number quicker -- in other words, that seat-of-the-pants quicker throttle response.

Doing a K&N with an ECU reflash is really the right way to go.

Now in an "old-school" engine (classic 900 for example), you would see a power and torque change as these older ECU's don't work the same way. They aren't looking to produce a specific torque number, thus HP number, and as such freeing up air, and adding the appropriate fuel to go with that will indeed produce a power change.
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Old 08-09-2009, 08:48 PM   #8
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Quote:
Originally Posted by Moonracer View Post
we found that on a dyno the K&N filter cost 3 hp over a regular paper filter on our race car.
worse hp with a better flowing filter?
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Old 08-10-2009, 06:49 AM   #9
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Quote:
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Was this with just a k&N filter or with an open intake?

I'm not doubting what you're saying, but isn't 3hp too small to attribute to one thing? I would believe it if you did 20 runs, did an average, then replaced the air filter with the K&N, did another 20 runs, took a new average, and found the 3hp loss. To me though, something like 3hp is so small that it's probably not statistically significant at all. I also wonder if a car would need a certain amount of time to "adapt" to any changes the air filter might cause. Interesting...

We did three identical pulls with the K&N filter the three with a stock paper filter of the same size and it averaged out to 3hp differance. We found it hard to believe too. One thing we thought about was the fact of the oil in the K&N being freshlly redone and the paper filter was also new. Mabey after some laps as the get dirtier the K&N might be better. We also have found alot more dirt in our carb. after a race with the K&N. With the paper filter we have alot less dirt in the carb. We were always firm believers in K&N untill this.
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Old 08-10-2009, 03:20 PM   #10
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Quote:
Originally Posted by Moonracer View Post
We did three identical pulls with the K&N filter the three with a stock paper filter of the same size and it averaged out to 3hp differance. We found it hard to believe too. One thing we thought about was the fact of the oil in the K&N being freshlly redone and the paper filter was also new. Mabey after some laps as the get dirtier the K&N might be better. We also have found alot more dirt in our carb. after a race with the K&N. With the paper filter we have alot less dirt in the carb. We were always firm believers in K&N untill this.
wat car was this? maybe it could be different on others?
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