Hi all,
After raising this:
http://clubjazz.org/forum/index.php?topic=4630.0 I thought I'd go ahead and post up a little how-to guide on putting a cone filter on your 2007-2008 Jazz sport (1.4I-DSI). The purpose of a cone filter (if you didn't know is multi-fold and includes the following:
1) Cheaper in the long run as you just clean the filter, rather than continuously installing discardable ones.
2) Improved throttle response (revs rise slightly quicker)
3) Increased intake 'growl' (for the racer in you...)
Anyways...
Requirements1 x cone filter - I used a BSR filter with 70mm diameter inlet but the diameter of inlet can be anything you like. I'd advise against reducing it less than the throttle body inlet (around 65mm diameter) for obvious reasons.
1 x breather filter (10mm diameter inlet) to go on the metal tube entering the airbox on the left side. The look like this:
1 x 90 degree silicone elbow. 65mm diameter (throttle body end) to whichever diameter the filter has (70mm in my case)
*If the filter you are using has a rubber body like the one I'm using, you'll need a length of tubing - 100mm maximum - to connect the silicone elbow to the filter. Aluminium is fine, and ensure the ends are rolled (and not sharp). The tighter the fit, the better.
Jubilee clips to suit (60-80mm will suit the throttle body connection. The ones at the other end will need to be tailored to your filter. They must be stainless steel and silicone friendly. I needed 3, if your filter has a metal inlet, then you'll only need 2.
When connected together you should have this:InstructionsStep 1: Start by removing the airbox. Disconnect the inlet hose into the airbox at the bottom right (it's rubber and simply pops off)
Step 2: You need not remove the filter and inspection cover but I did as it helped me manoeuvre the airbox out once disconnected.
Step 3: You'll require a 5.5mm socket to undo the clip securing the airbox to the throttle body,
Step 4: Now you'll need a 10mm socket to undo the two hex bolts holding the airbox to the car (both found at the leading edge of the airbox on left and right sides.
Step 5: Using a pair of pliers and some patience, release the retaining clip and withdraw the breather hose from the rubber grommet on the left hand side of the airbox. It is a straight tube and will pull out, do not try to remove the rubber grommet. It'll be in there quite tight so you my need to be patient. If this is a permanent move for you and you don't care about the airbox, you can run a knife down the grommet and cut the tube free.
Step 6: Connect the small breather filter
Once you have removed the airbox it is as simple as connecting up the new kit you've put together. You can hardly see the metal tubing in my kit as I almost ran out of space!
I've just run the set up and it sounds a lot gruffer than before. Not immediately mind. At first it sounds like before, then after WOT (wide open throttle) for 1/2 a second the intake sound becomes noticably deeper. And therein is a benefit of 8V engines - the intake growl is often throatier on an 8V than a 16v on account of valve size.
The revs rise quicker too but I doubt there's more power, maybe a couple of bhp if I'm lucky. All in all, I'm pleased with it, and because of the factory set up, there's no worry about MAF sensor relocating or any of that. Just bolt up and go.
Next step is to add a dedicated cold air intake and route cold air flow directly to the filter.
I already had this filter, and I know it's good for 300bhp so it's no sweat on the Jazz. Most aftermarket filters are between 65 and 80mm intake diameter so you should be able to pick and choose what you want to be running.
Total cost of parts was about £20, took 35 minutes to fit and I'm pleased.