OEM airbox feed size?


Biscuit

Biscuit

I love lamp
Joined
Feb 5, 2014
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Does anyone know what size tubing I can use into the OEM airbox?

Would be a feed from the front bumper to the air box, removing the resonator.
 
Biscuit said:
Does anyone know what size tubing I can use into the OEM airbox?

Would be a feed from the front bumper to the air box, removing the resonator.
Click to expand...


IMO 80mm . Don't forget to use some kind of velocity stack.
 
?

I was just going to run a feed from the facelift bumper vent to the airbox - is that wrong?
 
Well your gonna loose any gains your floppy pipe idea will achieve if the air flying towards your intake valves is whooping around like a texas twister. wiki velosity stacks. worth while doing it right first time no doubts
 
Interesting - so could a VS be attached to the end of the pipe & set it back from the bumper slightly?
 
Like this:

VS_zps594c6d5f.jpg
 
Would a stack really be any use, as the filter will distrub the flow of any air anyway, excellent on cars with no filter but cant see the worth on 1.6-1.8 N/A engines with an air filter fitter?
 
I used 95mm ducting for the oem box and it fitted over the rubber gromit that's on the bottom of the air box. Can squeeze the edge of the rubber in to make the ducting fit nicely around it.
 
robbieD said:
I used 95mm ducting for the oem box and it fitted over the rubber gromit that's on the bottom of the air box. Can squeeze the edge of the rubber in to make the ducting fit nicely around it.
Click to expand...


Do you have pics? please? thx
 
It's in his build thread in his sig.

I also looked at that & found it helpful.
I just cut the OEM feed in half before it returns into the resonator & turned it forwards, cut the small fog light part out & now it works like a feed into the air box.

Has to be better than the stupid resonator / engine bay feed (hot air).

Also saves a bit of weight.
 
Is in my build thread. About Page 4.

Only have pictures of it fitted to the Maxogen intake but was the same piece of pipe used when I changed back to OEM.

As Biscuit has already said you can easily cut the OEM pipe in half as an easier option should still work pretty well.
 
I use a 114mm flexy pipe on my modified itr airbox with a stack on the end. :)
 
Biscuit said:
How come you changed back to OEM over the other options you used?
Click to expand...

Sold it to make way for a different setup but didn't get another for quite a while. Just recently got a DC2 Mugen Copy Intake. Quite a bit better! :))
 
If you're making a feed to your intake I recommend getting/making the largest size feed tube possible, along with the velocity stack at the end.
B-series perform best with a short ram style intake so you want to simulate that with a low restriction air feed to your filter. If it's the same size going to the filter as going from the filter then you'll be simulating a longer "cold air intake" that just has the filter at the very end. These don't perform as well at high rpm's where you get most of your power.
 
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