Airbox modification..


haitch

haitch

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Thought I would see for myself about the resonator removal etc. I didnt want to spend £100 on a peice of tiny SPOON pipe. Seemed easier to remove the drivers wheel so I did, undid the arch liner and using the other threads as a guide removed the lower resonator (3x10mm bolts.). I cut the pipe just below where it fixes to the resonator and put it back on the car as tempory for now, worth noting that it is not round, at certain points it is oval shaped.
Then I had a look at the other resonator, to remove it you need a 10mm socket for 2 bolts, & one 8mm for where it fixes to the airbox. I tried a peice of 70mm gutter pipe it fitted ok at the airbox end but with a small gap, but at the tb end it needed to be 76mm, also for a better fit of course an angle. Note at the tb end it is round but at the airbox it is oval again. Put it all back together for a test drive - not much difference at this stage.
Then I ordered one of these to cut down and use..
45 Degree 76mm Hose Joiner Elbow from Merlin Motorsport
Before it arrived I saw a mate who had an old IK, so I trimmed his 76mm 45 degree bend down a touch, I needed vaseline to force the end into the tb side ooh err! Then you will see in the other picture I drilled a hole for a cable tie to hold the airbox in place. Stage one complete.
Tomorrow I will try to sort a CAF to the bumper using some of this..
3 in (80mm) ALUMINIUM CORRIGATED SEMI FLEXIBLE DUCTING on eBay, also, Other Heating Cooling Air, Heating Cooling Air, Home Garden (end time 26-Jul-08 22:52:42 BST)
Test drove the car and it pulls a fair bit harder than before, definately noticeable and thats without the CAF. It looks homemade for sure but I will modify things more later for a better finish :D
 

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bravo! that's pretty much what we did back in the day with some junkass aluminum intake pipes we had kicking around.
 
Yes its a very simple effective mod, so much room to play with.
 
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So all you need is a 76mm 45 degree pipe? Does the 76mm pipe fit in at the oval shaped airbox end ok, or do you need another pipe too?
Is it better to get a metal pipe over silicone as it can be manovered better?

I was going to buy spoon pipe but may fabricate something myself.
 
Just one 76mm 45 degree bend will do it - metal/plastic/carbon, a samco hose or similar will be no good because you have to use a bit of force on the tb side. The 76mm forces out the oval shape at the airbox side making it round and a tight fit.
 
spoon, mugen products are grossly overpriced, i am going the same way with the stock airbox & modify it for CAI, buying used stock airboxes & modding them are cheaper than paying for a spoon cf pipe.
 
it is a simple and cheap mod :)
i have the spoon pipe and love it.but must admit that it is massively overpriced etc.
the only advantage with it over the custom pipe mod is having a proper bracket because once you remove the upper and lower resonator the airbox becomes quite loose etc
 
I have an idea for the 45 bend, as for the bottom part mine is solid as I have left the bottom part of the pipe on (as it has a proper bolt fixing), now it is chopped in the middle of the first bend and have used a caf to the bumper. The large tie around the bottom of the airbox (pic 2) keeps it solid.
 
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haitch said:
ya I have an idea for the 45 bend, as for the bottom part mine is solid as I have left the bottom part of the pipe on (as it has a proper bolt fixing), now it is chopped in the middle of the first bend and have used a caf to the bumper. The large tie around the bottom of the airbox (pic 2) keeps it solid.
Click to expand...

exactly what im planning on doing :)
 
a friend of mine who is a passionate Honda tuner has verified on a dyno that we are losing a few hp just from using the stock rubber tube from the airbox to the TB, by replacing it with an appropriately sized solid tube (aluminum or pvc) power jumped up 2hp. i think it has to do with the resonant frequencies inside the intake system, soft rubber tube absorbs & dampens the sound & weakens the resonant frequency.

this is why sportbikes employ thick walled airboxes with no rubber tubes for ram air, it is to keep the resonant frequencies high & push more air in the cylinders by using the pulse waves from the intake, it's much like a 2stroke exhaust pipe in principle which uses sound & pulse waves from the exhaust to push more charge in the cylinder.

stock airbox isn't big enough even for an 1600cc engine so i ripped out that debris catcher which also doubles as a sound dampener to get more volume & raise the resonant frequency inside the airbox.
 
am i the only one who isn't able to remove the ****n resobox? --_--
I removed all bolts and it's only fixed on the u-tube... how can i remove that thing o0
 
you mean the lower one? or upper one mike?

they are both easy as hell to remove as long as you take all the bolts out.if you mean the u tube that goes into the bottom of the air box then there is a bolt near the top of the pipe also.
 
Do you mean taking the reso box off the u-bend?
Well here are my latest pics of my CAF, bear in mind that it is a rough & ready look for now as I would like to get a proper foglight duct - which will cover the holes left by the previous owner, later I will probably get an actual pipe made up from the TB all the way down. Excuse the 'warzone' look - damage by my cnut of a neighbour :angry2:
 

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wow - and here i am wanting to buy the rubber pipe but it loses hp.

Anyone know where i can get the right size pipe in silicone or alu which needs to join onto a mugen induction? also - one other q, my ek9 has a hose coming from this rubber pipe to the cam cover - what does this do? and iv seen some people replace this on the cam cover with a breather type thing - can someone explain?
 
cingli said:
wow - and here i am wanting to buy the rubber pipe but it loses hp.

Anyone know where i can get the right size pipe in silicone or alu which needs to join onto a mugen induction? also - one other q, my ek9 has a hose coming from this rubber pipe to the cam cover - what does this do? and iv seen some people replace this on the cam cover with a breather type thing - can someone explain?
Click to expand...

Here's a great thread on what the PCV does

Honda-Tech.com: Forced Induction: The Official Crankcase Evacuation thread for Turbo Hondas / PCV / Catchcan /

Sit back and read through it. As for the rubber arm. Samco has something.

Honda-Tech.com: Acura Integra Type-R: SAMCO INTAKE???
 
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