All the air filter pipes, what are they?

RemarkLima · November 14, 2007, 10:32:11 PM

So there\'s a bunch of pipes that go from the air box, just wondered if they are what I thinkj they are.

The 2 that are ~70-75mm diameter (big ones) are the main inlets to the turbos, then there\'s the airpump.

But then there\'s the 2 little ones, what are these? Are they the stock BOV\'s? And letting them vent to atmos, is that a problem? As they shouldn\'t be sucking... Unless they\'re something else?

Thanks for the paitence

Cheers,
Mark

Jit · November 14, 2007, 11:10:50 PM

2 main ones like you said are turbo inlets.
the one on the right of the box (if standing on front) simply vents out
the other 2 are for the Charge relief valve and BOV

Martiny · November 15, 2007, 06:34:43 AM

The Charge relief and Charge Control (BOV) release their pressure into the airbox to keep their noise down. The other small pipe is to allow this air to vent out of the airbox.

RemarkLima · November 15, 2007, 07:31:49 AM

So, as a temp solution only, I can just stick a filter on each of the large pipes and leave the rest to vent to atmos?

I\'ll stick a bit of cloth over them to stop any large bit\'s of cr@p getting in them, but principlly this should be fine?

As I say, it\'s just short term while I try and find what going on with my engine bay and need to get rid off the airbox for access.

RemarkLima · November 15, 2007, 09:49:18 AM

Sorry, one more question, does anyone know the Internal Diameter of the 2 main intakes to the turbos?

I only had a rough go with a tape measure in the dark (standing on one leg, with one eye shut, patting my head while singing I\'m a little teapot) so my measurments may have been a little rough at best

Cheers!
Mark

leon · November 15, 2007, 02:28:43 PM

*whaaaa* sorry mate i promised id do that for you last night! and i was in the garage as well :mad:

I\'m not able to measure them again at work, but did some searchign on your behalf! apparently the K&N filters that fit have an external Diamiter of 64mm around the flange.

RemarkLima · November 15, 2007, 02:48:56 PM

Cheers Leon

Thanks for the searching, my search styles are somewhat lacking at the mo\'... Can\'t seem to find any useful information!

But that\'s very useful, so now know I need a 64mm filter.

leon · November 15, 2007, 03:14:59 PM

Thats what the K&N ones are BUT they are for slipping over a metal pipe that replaces the stock... not slipping into the stock ones! just had that thought now. so it makes that tit bit of info useless :confused: (i think)

SmbFD3S · November 15, 2007, 03:31:13 PM

Quote from: MartinyThe Charge relief and Charge Control (BOV) release their pressure into the airbox to keep their noise down. The other small pipe is to allow this air to vent out of the airbox.

Not entirely true, the side outlet is for the air pump intake if still fitted...This connects to the airbox from underneath the airbox itself to draw in cool air...This is not filtered air either

RemarkLima · November 15, 2007, 04:37:05 PM

Quote from: leonThats what the K&N ones are BUT they are for slipping over a metal pipe that replaces the stock... not slipping into the stock ones! just had that thought now. so it makes that tit bit of info useless :confused: (i think)

Not really, means they are in the region of, so as long as they are close enough and tapered a bit I should be able to squeeze something in there!

leon · November 15, 2007, 05:05:24 PM

How much you looking to pay for your somthign to shove in there, as i know they sell thing son fleabay wich are metal pipes and filters (not somthing id want to use tbh, but it may work out cheaper than the filters individualy):Thumbs-up

RemarkLima · November 15, 2007, 05:16:48 PM

I think I\'ve seen then on fleaBay, works out at Â£30 or so but really it\'s only short term so I can try and find out what\'s going on then I\'ll sort out some decent induction and a cold air feed...

...But I think I\'ve found a local shop that sells something that should fit for Â£15 a shot, which will do just so I can start to see what\'s happening.

Martiny · December 03, 2007, 04:51:32 PM

Quote from: SmbFD3SNot entirely true, the side outlet is for the air pump intake if still fitted...This connects to the airbox from underneath the airbox itself to draw in cool air...This is not filtered air either

not entirely true either.

There is one small pipe that the air pump connects to, then there is another small pipe that connects to a hard pipe, that leads down to the bottom of the car.

This second pipe is the one for venting excess pressure from the airbox.

Now, unless the air pump can draw air through this hard pipe ONLY, then the air pump air IS filtered . :Giggle

SmbFD3S · December 03, 2007, 05:25:15 PM

We must be looking at different standard airbox set ups then, cos what i wrote is exactly how mine looks and is.....

I\'ll take some shots to clarify.

Why would there be excess pressure in the airbox?? It is ALWAYS gonna be at a negative pressure due to the intake.....

Martiny · December 03, 2007, 06:59:23 PM

Yeah pics are a good idea, lets get some up.

I will have to think about the theory of why there can be positive pressure. .....

lets see now........

lets say you\'re really booting it, on high boost etc....., then you lift off - the pedal shuts really quickly. A massive build-up of boost builds up in the system !

At the same time, the manifold now sees vacuum, which opens the blow-off valve, and this allows the built up pressure to vent through the blow-off valve... into the airbox - positive pressure !

:Laugh :Laugh :Laugh :Laugh :Laugh :Laugh