Modern Vespa

Thank you for the information Mike.

Additionally, I ground down the wquare pieces that probably disrupts smooth flow of air. Nice mod.

I read through this whole thread. my first thought is I wish I hadnt chucked spare airbox I had for my project 300. my second thought is changing the shape of the U in the divider is likely doing nothing. its simply not a restriction there. all the extra flow is coming from reducing the pressure drop across the rectangular channel. the biggest improvement would be seen by cutting it open nearer the entrance. as opposed to the v mod near the tail end.

I am also pretty certain the ECU is not capable of correcting for the extra airflow. the 02 sensor feedback can only correct for idle and light cruise conditions. 02 feedback is ignored during acceleration. the change here is likely just not big enough to cause a huge a/f swing.

I think I will mod mine by making the whole channel bigger with rounded edges at entrance and exit. this should maintain its original design which is to distribute air to the filter evenly by dumping air at top of box. and second to insulate my larger channel with sound deadener . I will snap pics and report my results.

You might like this thread: http://www.apriliaforum.com/forums/showthread.php?243793-Project-Vespa-300-SUPER-(should-end-up-living-up-that-name)