Air Flow Is Overrated - Zilvia.net Forums | Nissan 240SX (Silvia) and Z (Fairlady) Car Forum

twitchy · 04-22-2003, 11:54 AM

Okay enough is enough

Who can agree to this statement:

"Increasing airflow increases horsepower, so on a car, the best way to increase airflow for horsepower would be to remove the filter completely"

And yes I know you cannot drive like that so dont flame

But heres my problem. K&N says a 15% boost in horsepower

other companies say 5 to 10 horsepower gained by changing to a filter that looks like a cone or whatever

Does anyone agree with an increase of like, maybe 1 or 2 max HP? Cause i took my filter right out the other day and times the same run 5 times (fill throttle, second gear, 60 kms to 100 kms)

and it was the same each time as if I had the stock filter in!

So as I told K&N, Ill buy their filter when they stop saying it adds 15%, which on a 240SX is like...er... about 22 horses!!?? HAHAHAHA no.

PS I do like the sound they make though.

AKADriver · 04-22-2003, 12:02 PM

They say "up to 15%"

If you have a crappy, clogged stock filter, feeding a heavy modified engine... you just might.

It's just advertising.

Buy K&N because they filter well and they're reusable, not for any power increase.

Steeles · 04-22-2003, 12:11 PM

IIRC isnt the stock intake pipe the biggest restricter in most cars? i remeber reading somewhere they tested a panel filter a cone filter and a full intake tube w/filter. there was no noticable difference between the upgrade panel filter and the cone but put the pipe on and it made a huge difference. anyway something to think about.

Anubis · 04-22-2003, 12:48 PM

the cone filter and the velocity stack are supposed to straighten the airflow, making it less turbulent. Therefore increse horsepower. This is why you felt no diff. without the filter.

jsr20det · 04-22-2003, 02:55 PM

I heard that the a cone shaped filter gives best performance because it sucks air in from a 360 degree angle, as to having it naked will only induct air from one point.

*AceInHole* · 04-22-2003, 06:15 PM

Quote:

Originally posted by jsr20det
I heard that the a cone shaped filter gives best performance because it sucks air in from a 360 degree angle, as to having it naked will only induct air from one point.

and once the air is sucked in through the filter... where does it go, somewhere other than that "one point"?

Jun-Silvia · 04-23-2003, 01:16 AM

I replaced stock airfiler to K&N about a year ago. I felt a little better response but that's it. Not much noticable hp gain but it'll last lifetime so that's good. Gain 15% is total BS in my opinion. I would say 1-5 hp gain is the truth.

Steeles · 04-23-2003, 07:42 AM

note the key words in K&N's add... gains (now heres those keywords) UP TOO 15% . as I said its all in the application you could stretch a sock over your intake and see no difference if your piping is whats restricting your CFMs like it is on our cars

Chokets · 04-23-2003, 08:03 AM

i think the sock would probably get sucked in tho... and probably would have to be replaced alot at least. but i've never tried it, so don't take my word for it.

Steeles · 04-23-2003, 08:22 AM

Quote:

Originally posted by Chokets
i think the sock would probably get sucked in tho... and probably would have to be replaced alot at least. but i've never tried it, so don't take my word for it.

DUDE!! hose clamps on the real they're sock savers. i mean thats what we call them at the shop

ruf · 04-23-2003, 09:58 AM

Bah. Open turbo inlet. No filter. Just an intake horn. That's how it's supposed to be done.

Steeles · 04-23-2003, 10:27 AM

Quote:

Originally posted by ruf
Bah. Open turbo inlet. No filter. Just an intake horn. That's how it's supposed to be done.

YOU!! ceck your PMs/mail! now go do it hurry

hehe

04-22-2003, 11:54 AM	#1
twitchy Zilvia FREAK! Join Date: Apr 2003 Location: Ontario Posts: 1,579 Trader Rating: (0) Feedback Score: 0 reviews	Air Flow Is Overrated Okay enough is enough Who can agree to this statement: "Increasing airflow increases horsepower, so on a car, the best way to increase airflow for horsepower would be to remove the filter completely" And yes I know you cannot drive like that so dont flame But heres my problem. K&N says a 15% boost in horsepower other companies say 5 to 10 horsepower gained by changing to a filter that looks like a cone or whatever Does anyone agree with an increase of like, maybe 1 or 2 max HP? Cause i took my filter right out the other day and times the same run 5 times (fill throttle, second gear, 60 kms to 100 kms) and it was the same each time as if I had the stock filter in! So as I told K&N, Ill buy their filter when they stop saying it adds 15%, which on a 240SX is like...er... about 22 horses!!?? HAHAHAHA no. PS I do like the sound they make though.

04-22-2003, 12:11 PM	#3
Steeles Post Whore! Join Date: Sep 2002 Location: 7th layer of hell, special pit of anger Age: 47 Posts: 3,785 Trader Rating: (0) Feedback Score: 0 reviews	IIRC isnt the stock intake pipe the biggest restricter in most cars? i remeber reading somewhere they tested a panel filter a cone filter and a full intake tube w/filter. there was no noticable difference between the upgrade panel filter and the cone but put the pipe on and it made a huge difference. anyway something to think about. __________________ Keeping it Godzira bishes. So I murdered another turbo

04-22-2003, 02:55 PM	#5
jsr20det Zilvia Member Join Date: Feb 2003 Location: Chicago Posts: 268 Trader Rating: (0) Feedback Score: 0 reviews	I heard that the a cone shaped filter gives best performance because it sucks air in from a 360 degree angle, as to having it naked will only induct air from one point. __________________ 98 GSX

04-23-2003, 07:42 AM	#8
Steeles Post Whore! Join Date: Sep 2002 Location: 7th layer of hell, special pit of anger Age: 47 Posts: 3,785 Trader Rating: (0) Feedback Score: 0 reviews	note the key words in K&N's add... gains (now heres those keywords) UP TOO 15% . as I said its all in the application you could stretch a sock over your intake and see no difference if your piping is whats restricting your CFMs like it is on our cars __________________ Keeping it Godzira bishes. So I murdered another turbo

04-23-2003, 08:03 AM	#9
Chokets Endless Knights Join Date: Jan 2002 Location: NOVA Posts: 231 Trader Rating: (0) Feedback Score: 0 reviews	i think the sock would probably get sucked in tho... and probably would have to be replaced alot at least. but i've never tried it, so don't take my word for it. __________________ K.A.H. -so then i tell'er "yeah, honey, you're on the list, but i moved you way to the bottom!"

04-22-2003, 12:02 PM	#2
AKADriver Post Whore! Join Date: May 2002 Location: Springfield, VA Age: 42 Posts: 3,475 Trader Rating: (1) Feedback Score: 1 reviews	They say "up to 15%" If you have a crappy, clogged stock filter, feeding a heavy modified engine... you just might. It's just advertising. Buy K&N because they filter well and they're reusable, not for any power increase.

04-22-2003, 12:48 PM	#4
Anubis BANNED Join Date: Nov 2001 Location: SAN DIEGO, CA Age: 38 Posts: 990 Trader Rating: (0) Feedback Score: 0 reviews	the cone filter and the velocity stack are supposed to straighten the airflow, making it less turbulent. Therefore increse horsepower. This is why you felt no diff. without the filter.

04-23-2003, 01:16 AM	#7
Jun-Silvia Join Date: Jun 2002 Location: San Jose, CA Age: 49 Posts: 39 Trader Rating: (0) Feedback Score: 0 reviews	I replaced stock airfiler to K&N about a year ago. I felt a little better response but that's it. Not much noticable hp gain but it'll last lifetime so that's good. Gain 15% is total BS in my opinion. I would say 1-5 hp gain is the truth.

04-23-2003, 09:58 AM	#11
ruf Zilvia FREAK! Join Date: Jul 2002 Location: Reflex Racing, Los Angeles,TX Posts: 1,160 Trader Rating: (0) Feedback Score: 0 reviews	Bah. Open turbo inlet. No filter. Just an intake horn. That's how it's supposed to be done.