ak072007
Member
Registered: 4th Jun 11
User status: Offline
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Hi, I was wondering if anyone could tell me the purpose of this flap inside the airbox housing.
I tested the operation of the flap today. When the engine is off, the flap is open. When I start the engine, the flap closes.
Is this correct? Surely it's blocking my cold air intake? Or does it act as a vacuum and suck as I put my foot down?
I'd really appreciate the answer to this as it really has been bugging me all day lol.
Cheers
Alex
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Edges 58
Member
Registered: 30th Mar 10
Location: Nottingham
User status: Offline
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I believe it opens as the engine gets hot
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ak072007
Member
Registered: 4th Jun 11
User status: Offline
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Is there any benefit of removing this flap?
My airbox is already drilled
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Eddx14xe
Member
Registered: 12th Jan 10
Location: Hertfordshire
User status: Offline
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It routes hot air from the exhaust manifold into the airbox where it mixes with the cold air from the air intake. Its so the air going into the engine is the optimum temp for the engine
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ak072007
Member
Registered: 4th Jun 11
User status: Offline
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Ah I see so that's quite an important purpose. I won't remove it as it will just overfuel the system, not worth lessening the life of the engine for an extra 1 or 2 hp.
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Glen
Member
Registered: 2nd Sep 01
Location: Heathfield, East Sussex
User status: Offline
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why not fit a K&N type filter and get rid of the whole box. cold feed is better for a petrol in these summer months. plus it wont overfuel because the engine ECU watches the engine temp so once its warmed up the cold start fuction will stop and the fuel being injected will be the right amount for the amount of air being sucked in acording to the MAF sensor readings
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ak072007
Member
Registered: 4th Jun 11
User status: Offline
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I went for a drilled airbox (bottom far side only, how it should be done properly) as opposed to a cone type, cos i want under bonnet to look standard. Also that way you make sure only cold air is being sucked in away from the engine. I also have a BMC panel filter.
My drilled box sounds quite nice and deep, I'm still debating whether to remove this flap or not and see what happens.
If I removed the flap for constant cold air will it struggle in the winter???
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Edges 58
Member
Registered: 30th Mar 10
Location: Nottingham
User status: Offline
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I changed the airbox for one of a x14xe (I think that engine code is right) where it didn't have the flap thing and only one hole for air to go in then a pipe from a morette inner lamp to that as kinda a ram air induction.. Works nicely
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Glen
Member
Registered: 2nd Sep 01
Location: Heathfield, East Sussex
User status: Offline
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I've got a x14xe with a k&n but if ur thinking putting 1 on ur car, inside the air box there is a pipe the directs the air inside the air box, remove it they sound really throaty when accelerating
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