Boost level, air filter vs no air filter

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Jul 15, 2009 | 08:31 AM

rufretic

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Boost level, air filter vs no air filter

I'm making a little more boost than I would like to with my F2 at 26psi. Right now the inlet is wide open. How much do you think adding a 4" 90 with a big air filter will lower the boost? I know some people have used a retrictor plate on the blower inlet to limit boost so I figure adding a filter should restrict it some in the same way, I just have no idea how much. I'd like to get it down to around 20psi. I know I can swap pulleys but I'm planning to add the filter anyway so I don't want to start messing with pulleys unless I have to. Any ideas on how much boost might be lost with the air filter?

Jul 15, 2009 | 09:32 AM

AFASTYZFR1

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From: Florida

I don't have an F2 so I have no idea how much it will limit your boost, but it you are going to run it on the street a lot you might as well throw a filter on it and see what happens. Then you can re-pulley it if necessary.

But a 4" 90 with a large filter probably won't limit it much

Jul 15, 2009 | 09:33 AM

nastychevelle

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From: troy, IL

if your planning on doing it anyway just do it and let us know and then swap pulleys if it doesn't lower it enough

Jul 15, 2009 | 09:49 AM

Pro Stock John

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You should run a filter anyway so go get it and see what it does. I fugged up my blower from ingesting crap, that's why my blower went from being a YS to a YSi.

Jul 15, 2009 | 06:00 PM

gametech

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From: Stockbridge GA

If just a filter doesn't do the trick, you could also use one of those filter socks for added restriction.

Jul 15, 2009 | 09:41 PM

rufretic

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Thanks for the responces guys. I thought maybe someone would have a back to back with and without the filter to give me an idea on how many psi I might lose. I'm guessing only about 2psi but I guess I'll just try and fit one on and see what it does.

Jul 15, 2009 | 09:45 PM

rufretic

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Quote:

Originally Posted by Pro Stock John

You should run a filter anyway so go get it and see what it does. I fugged up my blower from ingesting crap, that's why my blower went from being a YS to a YSi.

How many miles did you run it without the filter to cause that? I didn't think it would be that big of a deal since I only put about 500-1000 miles on the car a year. Now I'm going to put the filter on for sure just for that alone.

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Jul 15, 2009 | 10:05 PM

rufretic

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Quote:

Originally Posted by 'Trust'

I picked up 3.5 PSI with no airfilter.

Wow, that's a pretty good amount. Maybe the air filter will get me to where I want to be.

Jul 16, 2009 | 12:53 AM

#10

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From: Marysville, WA

I didn't monitor the boost change but I picked up 35rwhp by removing my 90* elbow & large cone filter on my F1 at 14 psi so it should "help" to add one....