have any of you guys made a bfi?
11-07-11, 05:55 PM
#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.
11-08-11, 06:30 PM
#38
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08-13-12, 10:22 AM
#42
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.
08-13-12, 11:59 AM
#43
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.
08-13-12, 01:35 PM
#44
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Don't try to re-invent the wheel
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.
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.
08-13-12, 06:21 PM
#45
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
