have any of you guys made a bfi?
#35
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This is a trick Porsche guys have been doing for years on 911 SC's and 964's. Take a hole saw and fill the air box with holes. It didn't make a bit of difference in performance (just pulled more hot air from an already hot air-cooled engine bay) but it did give the cars a throaty sound.
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#42
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No top cover. The underside of the hood covers the top
Since it's not a ram air set-up, I'm not looking for higher pressure or an airtight set up.
The idea is only for cooler air. The calculation to estimate your increase in horsepower is 1.5% increase for every 10 degree drop in degrees fahrenheit.
The cone filter overcomes negative pressure in the airbox that occurs with the stock airbox, a BFI accomplishes this as well.
So in effect all I have done is kept the original airbox's cold air source with a higher flow filter.
Don't put one of those short ram intakes on these cars, everything I have read about these says they lose hp for our cars. The stock black plastic intake acts as a sort of "reservoir" for air to pulse into the intake, linear flow intakes flow better, but they lose hp as there is not a reserve to pulse into the intake when it sucks the air in.
Since it's not a ram air set-up, I'm not looking for higher pressure or an airtight set up.
The idea is only for cooler air. The calculation to estimate your increase in horsepower is 1.5% increase for every 10 degree drop in degrees fahrenheit.
The cone filter overcomes negative pressure in the airbox that occurs with the stock airbox, a BFI accomplishes this as well.
So in effect all I have done is kept the original airbox's cold air source with a higher flow filter.
Don't put one of those short ram intakes on these cars, everything I have read about these says they lose hp for our cars. The stock black plastic intake acts as a sort of "reservoir" for air to pulse into the intake, linear flow intakes flow better, but they lose hp as there is not a reserve to pulse into the intake when it sucks the air in.
#43
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The only things I see are special about the BFI, is that it's really cheap, it's easy to build (but so is a CAI), and that it looks OEM (if you like that appearance).
However, all it really is, is a DIY Cold-Air Intake, with the filter in the middle, versus on the end of the pipe.
The other difference being that instead of a cone filter, it uses the OEM filter, or TRD Filter (which actually flows much better). Therefore, it's not really the BFI itself thats so great, but the filter you choose. I don't see how it's any different than getting a K&N Filter, and simply running a pipe down, like any other CAI. The only thing I'd recommend doing first (if you use a K&N), is clean it off a bit before installing, 'cus they come somewhat oily (as a preservative) from the factory; that oil can enter your intake; so clean it off a bit first, and a K&N should be great. Until I see a Dyno Sheet, or some kind of Chart, I think the BFI's just a glorified CAI. I won't say it's over-rated, 'cus I know it DOES work, I just don't think it's substantially better than any good CAI.
However, all it really is, is a DIY Cold-Air Intake, with the filter in the middle, versus on the end of the pipe.
The other difference being that instead of a cone filter, it uses the OEM filter, or TRD Filter (which actually flows much better). Therefore, it's not really the BFI itself thats so great, but the filter you choose. I don't see how it's any different than getting a K&N Filter, and simply running a pipe down, like any other CAI. The only thing I'd recommend doing first (if you use a K&N), is clean it off a bit before installing, 'cus they come somewhat oily (as a preservative) from the factory; that oil can enter your intake; so clean it off a bit first, and a K&N should be great. Until I see a Dyno Sheet, or some kind of Chart, I think the BFI's just a glorified CAI. I won't say it's over-rated, 'cus I know it DOES work, I just don't think it's substantially better than any good CAI.
#44
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As you can see there is plenty of help along with a lot of opinion here for you. I would think you would listen to the ones that have done all the work and perfected the thing in the first place. It would be to your benefit.
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Welcome to Club Lexus and I hope you find all that you are looking for and more! Congrats on being the proud owner of a SC.
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#45
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There's two ways you can lose power with a BFI. One is by putting an injen type short ram after the MAF. The other is by just putting a K&N filter without isolating the hot air from the engine. There are dyno sheets that prove this.
The people with the best results built a BFI that is essentially a ram air set-up
The people with the best results built a BFI that is essentially a ram air set-up