Using a filter gives more HP?
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On The Tree
Joined: Jan 2008
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Using a filter gives more HP? 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
Justin
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
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From: Savannah, GA
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.
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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.
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.
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.
Why? My best guess is that the filter smoothed out the airflow (less turbulence) allowing more in.
