surok
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Wednesday, September 22, 2010 0:00 PM
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Airbox design
This is a very interesting read about designing the airbox.
(Airbox * Frequency), squared, is proportional to inlet pipe area/(airbox volume X inlet length)
http://www.saltmine.org.uk/randy/airboxdesign.html
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Whore of Babylon
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RE: Airbox design
Wednesday, September 22, 2010 10:12 AM
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?? whats it all about bro?
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cogs
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RE: Airbox design
Wednesday, September 22, 2010 11:51 AM
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It's just another story about the complexity of getting more power out of an n/a.
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wiz
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RE: Airbox design
Wednesday, September 22, 2010 9:43 PM
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I did a less complicated version of this in my n/a SW20 many years ago by running a 3 inch flexible pipe from the side of the airbox down to the vents on the passenger side of the car with some success.
There was a gain of around 4KW ATW and an extra 14nm in torque.
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surok
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RE: Airbox design
Wednesday, September 22, 2010 10:28 PM
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so you removed the big resonator and the pipe that already goes down from the airbox?
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wiz
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RE: Airbox design
Thursday, September 23, 2010 2:38 AM
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No Richard---I didn't remove anything. I just added the pipe to the existing setup and straight away you could hear the extra air being sucked in at the vents.
I didn't think the existing small pipe sucked enough air in so I tested this theory by having it dynoed and then removing the top off the airbox and dynoing it again---the improvement was amazing and that was what encouraged me to try and get more air into the thing.
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surok
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RE: Airbox design
Thursday, September 23, 2010 2:50 AM
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how long was this pipe? because from the end of the airbox to vent pipe to the vent is only about an inch
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purple5ive
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RE: Airbox design
Thursday, September 23, 2010 2:58 AM
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surok
go home and take the air cleaner cover off, secure the airfilter properly with some zipties(zip them around the box so the airfilter doesn't fly off etc) and then go for a drive
come back and tell us what you think.
im sure you will see that you dont need any formula to work that out
cheers
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surok
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RE: Airbox design
Thursday, September 23, 2010 3:08 AM
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i have had a k&n pod before. that was on my car when i first bought it, and i dont remember there being some awesome induction noise.
BUT... it was a long time ago.
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wiz
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RE: Airbox design
Thursday, September 23, 2010 3:21 AM
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quote:
Originally posted by surok
how long was this pipe? because from the end of the airbox to vent pipe to the vent is only about an inch
I cut a hole in the left hand side of the airbox and inserted and sealed the 3 inch pipe then manouvered it down to the vents---approx.2 feet(600mm) and it sat right up against the inside of the vent whereas the pipe you are talking about is on the other side of the airbox (RHS) and higher and back a bit from the vents from memory. IMO this is a better option on a n/a than removing resonator boxes etc. which are there for a reason and fitting a pod filter. I have known guys who have done this and whilst they sounds nice they found power was actually reduced.
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purple5ive
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RE: Airbox design
Thursday, September 23, 2010 3:22 AM
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imo the airbox with the lid open sounds better/louder than the pod filter at high revs
im sure it will give some increase in hp.
btw same with the pod this doesn't go well with heat soak, which is why most run a cold air duct, which really ruins the sound
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Reddtarga
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RE: Airbox design
Thursday, September 23, 2010 6:49 AM
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Wiz. That's interesting stuff and sounds like something worth tying.
I was just wondering, did you retain the stock panel filter?
Also was there any particular reason for choosing 3 inches in diameter for the extra intake pipe?
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wiz
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RE: Airbox design
Thursday, September 23, 2010 8:29 AM
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quote:
Originally posted by Reddtarga
Wiz. That's interesting stuff and sounds like something worth tying.
I was just wondering, did you retain the stock panel filter?
Also was there any particular reason for choosing 3 inches in diameter for the extra intake pipe?
I could have left the stock panel filter in but I ended up fitting a K & N panel filter mainly because you only have to clean and oil them every 50,000km instead of replacing them. As far as the intake pipe goes I was thinking bigger is better for more air and 3 inches was about the maximum diameter to fit comfortably into the side of the airbox.
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purple5ive
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RE: Airbox design
Thursday, September 23, 2010 11:08 AM
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stock toyota panel filter is actually pretty good flowing unit
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