Air Filter mod - picture and measurements added.
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Enthusiast
White GTS 300
Joined: 03 Nov 2008
Posts: 95
Location: France / Near Paris
Sun Aug 28, 2016 11:58 am quote
Thank you for the information Mike.
Hooked
2017 Vespa GTS 300ie
Joined: 07 May 2017
Posts: 141
Location: Southampton, New York
Wed Jul 04, 2018 4:51 am quote
Not only Growls, it HOWLS.
Additionally, I ground down the wquare pieces that probably disrupts smooth flow of air. Nice mod.

airboxMod copy.jpg

Hooked
gtv 300 super super
Joined: 02 Apr 2013
Posts: 104
Location: tampa
Tue Jul 31, 2018 10:26 am quote
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.
Enthusiast
GTS 250
Joined: 26 Apr 2008
Posts: 71
Location: California
Sun Aug 19, 2018 9:20 pm quote
jerryd wrote:
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.
You might like this thread: http://www.apriliaforum.com/forums/showthread.php?243793-Project-Vespa-300-SUPER-(should-end-up-living-up-that-name)
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