Joined: 15th Nov 2004
Ride: AU III XR8 Pursuit 250 ute
Item: EF Top Air Box Lid (with funnel) - fits EL/AU to
Price: I dunno start off at $20.00?
Description: Up for grabs is an original EF/NF/DF style air box lid with the internal funnel which flows better according to AutoSpeed tests:
Ford AU Falcon
This box uses a very large filter having an area of no less than 510 square cm. The inlet to the box is in the lower half, with this duct having a diameter of 80mm. The outlet duct has a moulded-in plastic bellmouth but its outlet ID is only 58mm. However, the outlet assembly unbolts from the airbox revealing that the actual outlet hole can be as much as 80mm in diameter! The lid clips to the base that is heavily curved to match the inner wheel arch area. The box is 380 x 280 x 310mm and costs $58 for the lid and $65 for the tray (new prices from Ford). Clips are used to hold the box together.
The large size of the filter meant that this box flowed quite well, with a filtered cfm rating of 93. However, it's interesting to note that fitting the filter caused a substantial flow drop of 17 per cent.
Flow of box with filter: 93 cfm
Conclusion: Amongst the better airboxes for flow, but see below for how to make a dramatic improvement!
Ford EF Falcon
This box uses the same lower half as the AU Falcon box mentioned above, however the EF lid has a much better integrated exit duct. This duct starts with a well-designed 50mm bellmouth deep inside the lid that grows in diameter to 80mm as it leaves the box. In the photo above, the EF upper half is on the left and the AU on the right. The filter used is the same as the AU, with a 510 square cm area. The box is 380 x 280 x 310mm and the EF lid costs $64 from Ford.
This is a much better flowing design than the AU box. The flow with the filter fitted was 110 cfm, up over the AU box by a very substantial 18 per cent! Even more importantly, the filter caused only a 3 per cent flow decrease, rather than the 17 per cent decrease that occurred when the same filter was fitted to the AU box. This is probably because the outlet duct draws from the centre of the filter rather than one end of the box, in addition to its bigger final diameter. It would therefore appear that swapping an EF lid onto your brand new AU Falcon can improve box airflow by 18 per cent!
Flow of box with filter: 110 cfm
Conclusion: The second-best flowing airbox after the de-snorkled VS Commodore. However, at $24.50 (Ryco), the filters are not as cheap as those for the Holden boxes.
It's obviously the one on the left in the picture showing the difference of the two, you can see the funnel thing in it.
Reason for sale is that I have no use for it, there's a supercharger in the way.
I'm happy to organise postage at buyers expense.
Heaps of performance EF/L parts for sale, including supercharged VCT motor!
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