Sun Aug 28, 2016 11:58 am

Enthusiast
White GTS 300
Joined: 03 Nov 2008
Posts: 95
Location: France / Near Paris
 
Enthusiast
White GTS 300
Joined: 03 Nov 2008
Posts: 95
Location: France / Near Paris
Sun Aug 28, 2016 11:58 am linkquote
Thank you for the information Mike.
⬆️    About 2 years elapsed between posts    ⬇️
Wed Jul 04, 2018 4:51 am

Hooked
2017 Vespa GTS 300ie
Joined: 07 May 2017
Posts: 141
Location: Southampton, New York
 
Hooked
2017 Vespa GTS 300ie
Joined: 07 May 2017
Posts: 141
Location: Southampton, New York
Wed Jul 04, 2018 4:51 am linkquote
Not only Growls, it HOWLS.
Additionally, I ground down the wquare pieces that probably disrupts smooth flow of air. Nice mod.



⬆️    About 27 days elapsed between posts    ⬇️
Tue Jul 31, 2018 10:26 am

Addicted
2010 gts 300 super. 09 MP3 500 lite
Joined: 02 Apr 2013
Posts: 820
Location: tampa
 
Addicted
2010 gts 300 super. 09 MP3 500 lite
Joined: 02 Apr 2013
Posts: 820
Location: tampa
Tue Jul 31, 2018 10:26 am linkquote
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.
Sun Aug 19, 2018 9:20 pm

Hooked
GTS 250
Joined: 26 Apr 2008
Posts: 292
Location: California
 
Hooked
GTS 250
Joined: 26 Apr 2008
Posts: 292
Location: California
Sun Aug 19, 2018 9:20 pm linkquote
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)
Sat Aug 25, 2018 2:13 pm

Addicted
2010 gts 300 super. 09 MP3 500 lite
Joined: 02 Apr 2013
Posts: 820
Location: tampa
 
Addicted
2010 gts 300 super. 09 MP3 500 lite
Joined: 02 Apr 2013
Posts: 820
Location: tampa
Sat Aug 25, 2018 2:13 pm linkquote
My modded box
I was putting off modding my box. Since installed this new exhaust and maybe before I have been battling detonation WOT. A few days ago I installed a 170cc injector to replace the factory 158cc. It was immediately noticeable difference with the extra fuel. and it took several days of driving around till it felt as fast as it was. So I figure it was safe to lean it out some with the airbox mod. only to find I was running around with no dang filter. dont think I will be able to ad to seat of the pants difference.

My attention was on the channel only. and the entrance seemed like a bad design. Would like to talk to engineer on why they have that little lip that looks like all it will do is cause turbulence at the entrance. I used a heat gun first to bend it out of the way. then I ground the lip all the way around so the glue would have something to stick too. on the channel itself I heated the end and flared it. and cut a smallish relief hole. I think flow through channel is greatly improved. I will be ordering a malossi filter as I miss the airbox sound. was kinda depressing taking it for its first spin with a filter onboard. way to quiet.







and at same time this was done my friend was doing his beo 500 box. I was floored at how restrictive the intake snorkel is on this 460cc 39hp bike. it wouldnt pass a nickel. he got much more seat of the pants power.
⬆️    About 3 years elapsed between posts    ⬇️
Mon Mar 29, 2021 2:12 am

Member
Joined: 29 Mar 2021
Posts: 8

 
Member
Joined: 29 Mar 2021
Posts: 8

Mon Mar 29, 2021 2:12 am linkquote
Hello,

I have a 2019 vespa gts 300 hpe.
Read about the air box mod.

The airbox i have is the same as the older model except for the longer hose. Not sure why they made this hose longer, cant see why this would be better.

Think im going to do the V on the box inlet, also tempting to do something about that long hose.



Mon Mar 29, 2021 2:24 am

Member
Joined: 29 Mar 2021
Posts: 8

 
Member
Joined: 29 Mar 2021
Posts: 8

Mon Mar 29, 2021 2:24 am linkquote
Foto



Mon Mar 29, 2021 4:49 pm

Ossessionato
Blue GTS300 Super 2015, White GTS300 Super 2018
Joined: 01 Nov 2005
Posts: 2877
Location: Sydney, Australia
 
Ossessionato
Blue GTS300 Super 2015, White GTS300 Super 2018
Joined: 01 Nov 2005
Posts: 2877
Location: Sydney, Australia
Mon Mar 29, 2021 4:49 pm linkquote
It looks like air flow could be improved by cutting off some of that pipe, but don't be fooled. I tried that on my filter and the result was disastrous. That is a tuned length for induction pulses, and cutting it might have the wrong result.

Please experiment and let us know the results, but if you attack that pipe, be prepared to buy replacement. Just opening up the snorkel might be all you can mod out of that filter. The Malossi red filter element also helps, but I didn't like the induction noise that came with it. If you get really serious about it, consider replacing the whole filter with a K&N one.
Tue Mar 30, 2021 4:11 am

Member
Joined: 29 Mar 2021
Posts: 8

 
Member
Joined: 29 Mar 2021
Posts: 8

Tue Mar 30, 2021 4:11 am linkquote
Did only the box inlet, didnt had a spare pipe so left that alone, maybe in the future, but i also think vespa probaly had a reason to make the pipe longer.

Just ride 20km and im not unhappy.
Its not really faster looking at the 0-60 time, from the start is feels faster and the gas response feels better. It makes a bit more noise but that i like. It feels like the bike is happier now and can breath normal😜



Tue Mar 30, 2021 1:27 pm

Ossessionato
Blue GTS300 Super 2015, White GTS300 Super 2018
Joined: 01 Nov 2005
Posts: 2877
Location: Sydney, Australia
 
Ossessionato
Blue GTS300 Super 2015, White GTS300 Super 2018
Joined: 01 Nov 2005
Posts: 2877
Location: Sydney, Australia
Tue Mar 30, 2021 1:27 pm linkquote
That is about how much mine is cut away. Some guys drill holes all along the snorkel. Depends on how likely you are to get water splashed up there. I avoid riding in the rain if at all possible. Have a car for that!

Maybe the snorkel is also to keep gravel out. If you only ride on smooth dry roads I guess the snorkel is not needed at all.
Wed Apr 21, 2021 7:57 am

Member
Joined: 29 Mar 2021
Posts: 8

 
Member
Joined: 29 Mar 2021
Posts: 8

Wed Apr 21, 2021 7:57 am linkquote
Very soon going to adjust the inducation pipe. First going to cut to the halve of the airbox and later then might all of it. The boxvolume is now made less becouse of the longer induction pipe(not even half of the airbox is used). This could be for noise reduction or it really has a reason and cutting it, is going to make things worse, we will see. If not okey i just fit a new one.
Mon Apr 26, 2021 4:33 am

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Joined: 29 Mar 2021
Posts: 8

 
Member
Joined: 29 Mar 2021
Posts: 8

Mon Apr 26, 2021 4:33 am linkquote
Well today i have modded the pipe.
I had the idea to first cut half of it, test it and then all of it.

So i cut halve of it as seen on the foto and tested it. Make sure the pipe and the box is clean after.

I have not experienced any negatives. Its makes a bit more noise and on full trottle is feels more aggresive/powerfull.

If i had to chose for this or orginal i would chose this.

Maybe in the future i will do the whole pipe, but this is fine for now and maybe all of it is too much.



Mon Apr 26, 2021 4:34 am

Member
Joined: 29 Mar 2021
Posts: 8

 
Member
Joined: 29 Mar 2021
Posts: 8

Mon Apr 26, 2021 4:34 am linkquote
Foto



Mon Apr 26, 2021 4:34 am

Member
Joined: 29 Mar 2021
Posts: 8

 
Member
Joined: 29 Mar 2021
Posts: 8

Mon Apr 26, 2021 4:34 am linkquote
Picture is upside down



Mon Apr 26, 2021 5:09 am

Member
Joined: 29 Mar 2021
Posts: 8

 
Member
Joined: 29 Mar 2021
Posts: 8

Mon Apr 26, 2021 5:09 am linkquote
Robert12345 wrote:
Above Pictures are upside down
⬆️    About 1 month elapsed between posts    ⬇️
Thu May 27, 2021 2:45 pm

Hooked
GTS 250
Joined: 26 Apr 2008
Posts: 292
Location: California
 
Hooked
GTS 250
Joined: 26 Apr 2008
Posts: 292
Location: California
Thu May 27, 2021 2:45 pm linkquote
Robert12345 wrote:
Hello,

I have a 2019 vespa gts 300 hpe.
Read about the air box mod.

The airbox i have is the same as the older model except for the longer hose. Not sure why they made this hose longer, cant see why this would be better.

Think im going to do the V on the box inlet, also tempting to do something about that long hose.
I wonder if this longer pipe fits on the older models. The longer length should be tuned for a higher RPM.
Thu May 27, 2021 5:18 pm

Ossessionato
Blue GTS300 Super 2015, White GTS300 Super 2018
Joined: 01 Nov 2005
Posts: 2877
Location: Sydney, Australia
 
Ossessionato
Blue GTS300 Super 2015, White GTS300 Super 2018
Joined: 01 Nov 2005
Posts: 2877
Location: Sydney, Australia
Thu May 27, 2021 5:18 pm linkquote
I found that shortening the old version of the pipe was not a good idea, so maybe lengthening it using the new pipe will result in something good. Keen to hear your results. Certainly looks good for smooth air flow.
⬆️    About 1 month elapsed between posts    ⬇️
Thu Jul 08, 2021 1:32 am

Hooked
Supertech 2019 (EURO3/APAC)
Joined: 17 Nov 2020
Posts: 370
Location: Melbourne, Australia
 
Hooked
Supertech 2019 (EURO3/APAC)
Joined: 17 Nov 2020
Posts: 370
Location: Melbourne, Australia
Thu Jul 08, 2021 1:32 am linkquote
Robert12345 wrote:
Well today i have modded the pipe.
I had the idea to first cut half of it, test it and then all of it.

So i cut halve of it as seen on the foto and tested it. Make sure the pipe and the box is clean after.

I have not experienced any negatives. Its makes a bit more noise and on full trottle is feels more aggresive/powerfull.

If i had to chose for this or orginal i would chose this.

Maybe in the future i will do the whole pipe, but this is fine for now and maybe all of it is too much.
interesting. on the HPE in asia pacific we have a different airbox without that pipe. see pics


with air filter in place


behind the air filter (and zoomed in a bit)

Thu Jul 08, 2021 2:45 am

Addicted
2010 gts 300 super. 09 MP3 500 lite
Joined: 02 Apr 2013
Posts: 820
Location: tampa
 
Addicted
2010 gts 300 super. 09 MP3 500 lite
Joined: 02 Apr 2013
Posts: 820
Location: tampa
Thu Jul 08, 2021 2:45 am linkquote
I would not recommend cutting the pipe like seen above. flow into any pipe can be increased significantly by adding a velocity stack on the entrance. thus eliminating the velocity stack as seen here was not a good idea. when the sound of intake is changed it can be misleading to whether or not there was a performance increase.

interesting there are two completely different box designs

Last edited by jerryd on Thu Jul 08, 2021 3:23 am; edited 1 time in total
Thu Jul 08, 2021 2:54 am

Ossessionato
Blue GTS300 Super 2015, White GTS300 Super 2018
Joined: 01 Nov 2005
Posts: 2877
Location: Sydney, Australia
 
Ossessionato
Blue GTS300 Super 2015, White GTS300 Super 2018
Joined: 01 Nov 2005
Posts: 2877
Location: Sydney, Australia
Thu Jul 08, 2021 2:54 am linkquote
Steelbytes, that filter does not look at all conducive to good air flow. Robert12345's mod looks good, and I have ordered the longer induction pipe to try it. But if it increases air flow much I may have to fit a larger injector, or install my Malossi Force-Master and set the mixture richer.

In my old-type filter box the induction pipe extends almost all the way to the outer box lid, with just a small gap for air to enter it. And the inside of the lid has a raised pattern on it which will also create turbulence.
Thu Jul 08, 2021 2:06 pm

Hooked
Supertech 2019 (EURO3/APAC)
Joined: 17 Nov 2020
Posts: 370
Location: Melbourne, Australia
 
Hooked
Supertech 2019 (EURO3/APAC)
Joined: 17 Nov 2020
Posts: 370
Location: Melbourne, Australia
Thu Jul 08, 2021 2:06 pm linkquote
jerryd wrote:
I would not recommend cutting the pipe like seen above.

interesting there are two completely different box designs
I don't have a pipe to cut!

The design that mine has first appeared several years ago on the GTS125 ...
Thu Jul 08, 2021 2:12 pm

Hooked
Supertech 2019 (EURO3/APAC)
Joined: 17 Nov 2020
Posts: 370
Location: Melbourne, Australia
 
Hooked
Supertech 2019 (EURO3/APAC)
Joined: 17 Nov 2020
Posts: 370
Location: Melbourne, Australia
Thu Jul 08, 2021 2:12 pm linkquote
Mike Holland wrote:
Steelbytes, that filter does not look at all conducive to good air flow.
Yup. I was replacing it, that's why i had the box open.

It was getting dirty very quickly because of some poor piaggio design where the air inlet would suck some air from the engine bay which of course is dusty on gravel roads. Had to use some foam to seal a gap before it would suck from the correct place which is under the front of the seat where the helmet pegs are
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