spdrcr7882

One of the magazines I subscribe to, I think it was import tuner, said that using a filter actually can increase horespower, due to velocity stacks that are built into the filters. http://www.importtuner.com/tech/impp...wer/index.html However, almost every post i have found on here suggests that guys pick up decent power by removing their filters. Anyone seen power increase with a filter on?
Justin

'Trust'

iTrader: (24)

I picked up over 100RWHP ditching the filter..

Mavmavv

An air filter is just another restriction, it is definitely not going to increase velocity.

And also, look at the article, its just written to sell filters. Complete Bullshit.

My2kz28

iTrader: (1)

I took my filter off on the dyno and made allmost the exact same RWHP. I guess my filter is not a restriction at all.

Not too mention its not worth putting your head unit in danger from rocks and crap getting in there.

'Trust'

iTrader: (24)

Guess not! Hows your hat routed?

ChevyChad

iTrader: (50)

the LT1's dont have a hat like the LS1's do. they are forward rotation, and the inlet is in the rear, so they have a lot better setup than we do

My2kz28

iTrader: (1)

It was custom made using 4 inch piping routed to the driver side fender. Maybe the way the LT1 blowers face the motor might have something to do with it, but we ran it for the hell of it and it didnt make a difference. Filter is a 12" K&N

ChevyChad

iTrader: (50)

Yea, the hats on the LS1 setup required to not hit the radiator shroud are quite restrictive. You LT1 guys can put a nice generous 4" constant cross sectional bend on the inlet side. We don't have that luxury.

'Trust'

iTrader: (24)

I am about to get a custom radiator and condenser made that have a cut out in that area!

hellbents10

iTrader: (10)

You will generally see the biggest gains in the supercharged cars because the boost will go up IF the air filter is a restriction. On a turbo vehicle not so much although IAT's and performance can still suffer. The reason being, the turbo vehicles boost is still dependant on the wastegate. So big...small it doesn't matter to a point as far as boost level.

We have dyno'd with single setups that will make the same hp with or with out a filter up to 1100hp or better. These had rather large filters though. The same setup would loose a good bit of power running a screen though.

We have dyno'd some low hp NA stuff that has gained power by adding a filter, as it does straighten the air out some.

Zombie

iTrader: (2)

I've personally witnessed a car LOSE hp on the dyno with the filter removed and then gain it back when it was installed again. Was on a Subaru motor. It lost about 10 AWHP with the filter off. Experiment was repeated to verify since everyone was surprised.

Why? My best guess is that the filter smoothed out the airflow (less turbulence) allowing more in.

My2kz28

iTrader: (1)

Yea but we're stuck with the LT1

spdrcr7882

They speak of a velocity stack inside the filter, does K&N filters use this, does this matter?
justin

baylove

iTrader: (35)

come on now aint nuttin wrong with a lt1 and with your numbers you have a happy lt1 653 rwhp 589 rwtq