Lexus ISF / IS-F / LFA / LF-A  Forum banner
1 - 20 of 24 Posts

·
Registered
Joined
·
81 Posts
Can anyone post vids of the sound difference between the stock isf and one fitted with only the k&n added (preferably in the cabin too) as i am thinking of getting this again.
Some other clips of the toms filter would also be handy if i dont like the K&n. Im all for gains but i want to retain that deep growl the ISF has and i aim to not make it raspy or loud in any way.
 

·
Registered
Joined
·
68 Posts
Can anyone post vids of the sound difference between the stock isf and one fitted with only the k&n added (preferably in the cabin too) as i am thinking of getting this again.
Some other clips of the toms filter would also be handy if i dont like the K&n. Im all for gains but i want to retain that deep growl the ISF has and i aim to not make it raspy or loud in any way.
to me it only seems a slight bit louder than the stock intake. and because you eliminate the air box/secondary intake flap it starts the louder noise earlier (lower rpm) just as if you did the diy intake flap mod (bypassed the secondary flap).
 

·
Registered
Joined
·
81 Posts
that sounds good. I didnt know there was a secondary flap in the airbox. Where can i read up on all this handy info about the isf? I like to know about the car i own not just drive it. Thanks.
 

·
Registered
Joined
·
434 Posts
to me it only seems a slight bit louder than the stock intake. and because you eliminate the air box/secondary intake flap it starts the louder noise earlier (lower rpm) just as if you did the diy intake flap mod (bypassed the secondary flap).
you are quite wrong. i did the diy mod, and i now have the k&n, and the k&n is way louder then the stock setup under any circumstance. there is no resonator in the intake pipe and its letting alot more air through
 

·
Registered
Joined
·
194 Posts
and its been proven the second flap mod slows the car down.
 

·
Registered
Joined
·
68 Posts
you are quite wrong. i did the diy mod, and i now have the k&n, and the k&n is way louder then the stock setup under any circumstance. there is no resonator in the intake pipe and its letting alot more air through
i'm not wrong. it's my opinion/perception. it's way louder at idle? it's way louder at cruising speed? now that's wrong. wot is it louder? sure. by how much? i don't give a sh!t.

i also don't care or give much thought to what possible sound level increase this mod brought as i did it for better efficiency and to pick up a few hp.

and after i get my exhaust put on i will probably hear even less of the intake :D
 

·
Registered
Joined
·
434 Posts
i'm not wrong. it's my opinion/perception. it's way louder at idle? it's way louder at cruising speed? now that's wrong. wot is it louder? sure. by how much? i don't give a sh!t.

i also don't care or give much thought to what possible sound level increase this mod brought as i did it for better efficiency and to pick up a few hp.

and after i get my exhaust put on i will probably hear even less of the intake :D
the only time it sounds the same is at cruise, under any throttle and its noticeably different. and once the exhaust quiets down, the intake is still heard over it...thats how loud it is
 

·
Registered
Joined
·
151 Posts

·
Registered
Joined
·
28 Posts
I've had my K&N sitting in a box for a month now and I just can't bring my self to pull the trigger and install it. It just seems that there is so much back and forth about whether it really has any gains that I think I will just let some more time tell the story. Thanks so much for posting up the results though.
 

·
Registered
Joined
·
411 Posts
1/4 Mile in 12.11?:eek: Is it possible? I might have to look at the numbers again..
 

·
Registered
Joined
·
8 Posts
Thanks Joe Z now I can finally understand why the K&N intake should not be used. Why take off a filter that is filtering crap for both intakes? It makes no sense to me. Why filter one air entry into the car when there are two?

And Mino you are right DYNO numbers are crap. Close that hood and than re test in the real world. Thats what the real test is all about. Big rep to both of you.
 

·
Registered
Joined
·
4 Posts
The K&N makes a noticeable difference, the mid range is smoothed out beautifully and the top end is cleaner and punchier, around town its very livable noise wise and you barely notice any difference from the stock item. But boot it and its a super loud induction roar - and i mean real race car loud, I have had mine for a few months installed it in a snap and local Lexus dealer loves it and approves of it - :)
 

·
Registered
Joined
·
7 Posts
Where, When, and How was it proven that this modification actually lost power? Was that a true statement?


Also where is an accurate real world test showing that it gained power?


Doing Dyno testing on two different days under different conditions proves nothing. Ambient temperatures, humidity, etc can all affect results. Doing back to back mods in real time in the same day within the same hour or so is the most accurate for seeing if a mod really does anything because we are talking about a fairly small power increase to begin with.

"Real World" results for testing power are DYNO testing, not seat of your pants highway testing. That proves nothing.

Likewise I find the dyno quarter mile time to be equally useless information.

Factual informed information would be greatly appreciated, thanks.

-Ben Phillips
Phillips Research & Engineering
 

·
Registered
Joined
·
30 Posts
Lets put all this to rest. Anyone in the Bay Area (San Jose/San Francisco/Monterey) with the K&N or any other intake. Lets race with mine and see if there is a real difference. I have no mods.
 

·
Premium Member
Joined
·
154 Posts
Lets put all this to rest. Anyone in the Bay Area (San Jose/San Francisco/Monterey) with the K&N or any other intake. Lets race with mine and see if there is a real difference. I have no mods.
If this is done, make sure the vehicle weights (including driver/passengers) are equalized as much as possible. Also, report any differences in wheels/tires.
 
1 - 20 of 24 Posts
Top