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Mark w
Newbie


Joined: 08 Sep 2017
Posts: 14



PostPosted: Thu Aug 23, 2018 2:55 pm    Post subject: Airbox modification to motorsound Reply with quote

Hi all, I obtained a second hand airbox cover to experiment with as I've seen lots of various opinions on whether a motorsound airbox actually makes much difference (sound wise that is!) so rather than destroy my existing one and regret it today I had a go at replicating the holes in the side (dimensions of which were given by a nice guy on rennlist who has a geniune one)

now before anyone says it, yes I could have gone to the effort of making a nice steel template drilling jig but I thought i'd do it a slighter different way as I wanted to trial it quickly.

So, I did a quick drawing of both sets of holes (one area is larger than the other) and printed the on tracing paper to use as a template, stuck the templates to airbox, centre mark the holes in the airbox (i used a trepan drill point for this) then used a trepan drill (with the aim to eliminate the need to de-burr after) to drill each hole.

it worked quite well and in all took about 40 mins. this weekend I will fit it to see what the end result is IF ANY!.

some pictures below help show the process. Ill be back soon with an update

Mark
 



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jonttt
Zolder


Joined: 20 Aug 2012
Posts: 5121
Location: Liverpool

2014 Porsche Boxster 981

PostPosted: Thu Aug 23, 2018 3:12 pm    Post subject: Reply with quote

But you don;t get the shiny metal edges to the intake which both cool the air (for better induction) and improve airflow Dont know












Joking but they do look nice when you open the engine bay Wink
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Mark w
Newbie


Joined: 08 Sep 2017
Posts: 14



PostPosted: Thu Aug 23, 2018 3:47 pm    Post subject: Reply with quote

Haha

I know what you mean!

If I can notice the difference in sound then I will probably get the plastic intake chrome plated (metalized plastic that is!) so I can admire each time I open the engine lid
 
  
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ch3tman
Hockenheim


Joined: 08 Dec 2012
Posts: 636
Location: South Bucks

1995 Porsche 993 Carrera 4

PostPosted: Thu Aug 23, 2018 7:40 pm    Post subject: Re: Airbox modification to motorsound Reply with quote

Nice work...!

Mark w wrote:
Ill be back soon with an update

Interested in your feedback! Smile
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Tobesetc
Barcelona


Joined: 02 Jun 2014
Posts: 1447
Location: West London, UK


PostPosted: Fri Aug 24, 2018 7:36 am    Post subject: Reply with quote

Also interested in your thoughts/feedback. I've got one of the shiny covers sat on a shelf unused because having a rear wing I elected for the "horn" attachment to bring cool air direct from the louvres in the wing.

Surely, if holes in the air box are a benefit, more holes are more benefit? Then eventually no cover is better than a cover? (Ie, one big hole)
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Mark w
Newbie


Joined: 08 Sep 2017
Posts: 14



PostPosted: Fri Aug 24, 2018 11:35 am    Post subject: Reply with quote

yes I think you are correct as I have seen airbox covers for sale that are little more than a frame (see attached picture), however this means every time you open the engine lid you are confronted with the view of your air filter. I was just trying to keep it look like it would with the factory option but maybe I will open the holes up or even cut the rectangular section of each aperture out to see a better result.
 



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Endoman
Suzuka


Joined: 11 Apr 2011
Posts: 1186
Location: Bolton U.K.


PostPosted: Fri Aug 24, 2018 8:59 pm    Post subject: Reply with quote

If you keep the clutch vent pipe it will become useless with a fully open airbox. The only benefit of a motorsound airbox is in the description (sound)
I'm not a fan of snorkels either.
I got rid of the clutch vent pipe, covered the vent with brass wire mess and plugged the airbox hole with the tiptronic plug. I run a motorsound airbox and I nearly jumped out of my skin with the glorious intake roar on wot over 4k rpm.
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rogttr
Spa-Francorchamps


Joined: 26 Apr 2010
Posts: 264
Location: West Kent


PostPosted: Sat Aug 25, 2018 9:27 pm    Post subject: Reply with quote

Endoman wrote:
........with the glorious intake roar on wot over 4k rpm.

^^^that.
I have a motorsound airbox available for purchase. Hardly used. £80. pm me.
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ch3tman
Hockenheim


Joined: 08 Dec 2012
Posts: 636
Location: South Bucks

1995 Porsche 993 Carrera 4

PostPosted: Mon Oct 15, 2018 10:54 am    Post subject: Re: Airbox modification to motorsound Reply with quote

Mark w wrote:
Ill be back soon with an update

...what were your conclusions?
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Mark w
Newbie


Joined: 08 Sep 2017
Posts: 14



PostPosted: Tue Oct 16, 2018 1:04 pm    Post subject: Reply with quote

Well I had a good drive to France a few weekends ago, Conclusion was that it really didn't make much difference even when i went through a long tunnel I never noticed a difference in the roar, so I assume like Endoman says i need to get rid of the clutch vent pipe plugged into the airbox.
I'll try this soon and post back on results.
 
  
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Fulla
Hockenheim


Joined: 08 Feb 2008
Posts: 732
Location: Ealing


PostPosted: Wed Oct 17, 2018 8:18 am    Post subject: Reply with quote

Endoman wrote:
If you keep the clutch vent pipe it will become useless with a fully open airbox. The only benefit of a motorsound airbox is in the description (sound)
I'm not a fan of snorkels either.
I got rid of the clutch vent pipe, covered the vent with brass wire mess and plugged the airbox hole with the tiptronic plug. I run a motorsound airbox and I nearly jumped out of my skin with the glorious intake roar on wot over 4k rpm.


Can I ask what the vent pipe does? Any issue with removing it?
If you have any pictures it would be helpful.

My airbox has the hole modification so I can't comment on sound before or after but I would be interested to investigate if the vent pipe is still active.
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