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General Category >> Rubber Side Down! >> K&N Filter question
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Message started by dekuji63 on 04/21/11 at 22:30:37

Title: K&N Filter question
Post by dekuji63 on 04/21/11 at 22:30:37

Hello from a n00b to the site - just got a new-to-me '09 S40 and we're making friends. I've been reading a lot here and probably have missed this but here's my question... is there any benefit to adding a K&N filter without any other mods? Or would it just be expensive and not have much affect?

I know backfiring is somewhat normal and especially the way I'm still learning how to operate this poor bike. I just wondered if the filter alone would help (aside from me learning how to treat the throttle, I mean :-[)

Thanks!

Title: Re: K&N Filter question
Post by Boule’tard on 04/21/11 at 22:39:11

The common thinking is that backfiring is caused by a lean mixture and if anything, the K&N will lean it out worse. I don't think you will see much benefit performance-wise unless you also uncork the muffler and rejet the carb.. save your money unless you are going to address those.

Title: Re: K&N Filter question
Post by verslagen1 on 04/21/11 at 22:41:08

No it wouldn't.
1st it'll make it leaner unless you rejet.
I recommend you leave it as it is for awhile.
maybe get together with some other savages so they can give you some tips.

Title: Re: K&N Filter question
Post by dekuji63 on 04/21/11 at 22:55:18

Thank you! I didn't really think it would make any positive change but I think I had the effect backwards. Still so much to learn! I'm not really planning on doing anything to her for a while except learning how to ride her much MUCH better.

Title: Re: K&N Filter question
Post by Routy on 04/22/11 at 05:56:57

Food for thought,.................
In a replacement filter, if there is less sg inches of filter surface, and less restriction than the stock filter, it means only one thing, it will ingest dirt.
IMO, the only safe way to get less restriction, is to increase the sq inches of filter surface.
If there was any restriction w/ the stock filter, (and I doubt there is) it would be at WOT only. Think about it,.....if there was any restriction at crusing speed, (1/2-2/3 throttle) what would happen at WOT using twice as much air ?