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Tobesetc
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Joined: 02 Jun 2014
Posts: 1265
Location: West London, UK


PostPosted: Fri Aug 04, 2017 11:50 am    Post subject: Air box 'trumpet' question Reply with quote

I'm in the process of upgrading to the sports airbox and because I've got the RS spolier I'm adding the air intake trumpet from a turbo (at the suggestion of 911UK). http://www.design911.co.uk/fu/prod131390/Porsche-993-Turbo-Air-Intake-Trumpet-99311036051/

One question... if you are parked and it rains, what would stop water getting into the trumpet and from there into the air box? Is there a drain in the box?
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AndyS
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PostPosted: Fri Aug 04, 2017 12:07 pm    Post subject: Reply with quote

I'd be interested in this too.... Pop Corn
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Sutton
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PostPosted: Fri Aug 04, 2017 12:08 pm    Post subject: Reply with quote

I think there's a drain hole at the bottom of the elbow.

It shouldn't be too difficult to drill one if there isn't.
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Chris993C2
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PostPosted: Fri Aug 04, 2017 12:14 pm    Post subject: Reply with quote

There's certainly a drain hole in the air box cover itself...

 
  
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Tobesetc
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PostPosted: Fri Aug 04, 2017 12:21 pm    Post subject: Reply with quote

Figures, thanks.
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NottsRS
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PostPosted: Fri Aug 04, 2017 12:25 pm    Post subject: Reply with quote

yes there is a small collecting well and a drain hole (bought mine from OPC). to fit you have to remove the existing small funnel and the internal duct, easiest to heat the cover up first Thumb
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911UK
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PostPosted: Fri Aug 04, 2017 1:47 pm    Post subject: Reply with quote

what NottsRS said

this is what the underside of the item looks like

with 2 drainage holes at the bottom
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Endoman
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PostPosted: Mon Aug 07, 2017 9:04 pm    Post subject: Reply with quote

After talking to Colin Belton at 9m I took it off, he reckon's it does nothing at all for a NA. The engine fan blasts all the warm air out ot the engine compartment and it kept coming loose, the FVD one listed for a 993 will not fit, it is for a 964 airbox. There could also be a disturbance to the clutch ventilation pipe as the interior airflow is different.
Perhaps it works better with the CS wing.
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911UK
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PostPosted: Wed Aug 09, 2017 11:33 am    Post subject: Reply with quote

Endoman wrote:
After talking to Colin Belton at 9m I took it off, he reckon's it does nothing at all for a NA. The engine fan blasts all the warm air out ot the engine compartment and it kept coming loose, the FVD one listed for a 993 will not fit, it is for a 964 airbox. There could also be a disturbance to the clutch ventilation pipe as the interior airflow is different.
Perhaps it works better with the CS wing.


in fairness to Colin that's doesn't just 'a reckoning' for this application

the OEM Porsche part fits, of course it's just a plastic piece fitted onto another plastic so don't expect a clinical cabin finish

since it's there to 'better direct' cold air into the airbox and avoid the hot air build up from within the engine bay that occurs as speeds rise with a fixed rear spoiler

sure the differences will be relative and more so at high speed, but there is a reason why Porsche have this on the RS and Turbo models
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Tobesetc
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PostPosted: Sun Aug 13, 2017 6:00 pm    Post subject: Reply with quote

Trumpet doesn't fit the sport airbox because the chrome effect bit is where the trumpet connects.

Ideas?
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Endoman
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PostPosted: Sun Aug 13, 2017 6:22 pm    Post subject: Reply with quote

You pull the chromed bit out ref:-
http://www.pelicanparts.com/techarticles/pcar_com/intake_temp_test2.htm
There is much chat about it on rennlist forum. In practice it makes very little difference, It is a turbo part allowing air to enter without going through the intercooler . It was not standard fitment on the RS. cutting away lots of the filter cover make things worse regarding intake temp but increase induction noise.
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911UK
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PostPosted: Mon Aug 14, 2017 11:32 am    Post subject: Reply with quote

Endoman wrote:
You pull the chromed bit out ref:-
http://www.pelicanparts.com/techarticles/pcar_com/intake_temp_test2.htm
There is much chat about it on rennlist forum. In practice it makes very little difference, It is a turbo part allowing air to enter without going through the intercooler . It was not standard fitment on the RS. cutting away lots of the filter cover make things worse regarding intake temp but increase induction noise.


useful link

with this at the bottom

Quote:
P.S.

993 NA owners with the factory retractable tail will not to be concerned about this. If you look closely at your grill in relation to the intake opening you will understand what I mean. Also when the tail is extended out there is a plastic wall in the back of the tail that directs cold air to enter the intake opening.

This addition is mainly for 993 NA cars with a fix tail installed on their 993. I do recommend this addition to be added to your 993 to ensure that you get as much cold air entering the intake as possible. as a reference (For every 10 degree change in air temperature there is 1% change in power)


The air temperature at the filter does not affect the turbo car in the same way as it does in a non-turbo car. This is due to the turbochargers ability to partially compensate by spinning faster and still compressing the same amount of air regardless of temperature.
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GT4
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PostPosted: Mon Aug 14, 2017 12:57 pm    Post subject: Reply with quote

Gives 6 degrees cooler air to airbox

Pages 21-23 discusses the trumpet (or ansaugtrichter):

http://www.911uk.com/viewtopic.php?p=820590#8205908
 
  
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Tobesetc
Barcelona


Joined: 02 Jun 2014
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PostPosted: Mon Aug 14, 2017 4:16 pm    Post subject: Reply with quote

Useful links there, thank you.

I'll be damned if I can get the snorkel out without damaging the main cover, so may try again at the weekend, as the horn seems like the sensible mod whereas the sports/sound box... has at least been fitted OK.

Will try the remove the snorkel from the old cover and use that with the trumpet.
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NottsRS
Barcelona


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PostPosted: Mon Aug 14, 2017 4:43 pm    Post subject: Reply with quote

^^ as mentioned previously it's easier to dismantle when warm, so either take the car for a hot run or put the airbox cover in the oven...but not too hot or on grill setting!
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Tobesetc
Barcelona


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PostPosted: Tue Aug 15, 2017 7:03 am    Post subject: Reply with quote

As I now have two air-boxes with two snorkels, I think I'll just use a small drill (dremel type thing) to remove the securing lugs on the old snorkel and bin it. That means I can fit the horn to the old air-box to get cold air or use the new one to get sound...

...this will inevitably leave me with an unwanted almost new sports air-box (in about 2 weeks). Unless I dislike the horn for some, as yet unforeseen, reason.
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Tobesetc
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PostPosted: Tue Aug 15, 2017 12:35 pm    Post subject: Reply with quote

I'm starting to wish I never thought of this...

So, heat was a good call. Bowl of hot water and the snorkel was removed in one piece.

Next issue - the horn fouls on the bonnet lid - see picture below. Not just the lip, it'll foul quite a long way down. See the red lines. Did other people have this issue? Reluctant to start cutting it up.

It's almost like I need a mirror image of the horn I've got - if it bent like the alternative blue line it'd be fine...
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PostPosted: Tue Aug 15, 2017 12:43 pm    Post subject: Reply with quote

Tobesetc wrote:
I'm starting to wish I never thought of this...

So, heat was a good call. Bowl of hot water and the snorkel was removed in one piece.

Next issue - the horn fouls on the bonnet lid - see picture below. Not just the lip, it'll foul quite a long way down. See the red lines. Did other people have this issue? Reluctant to start cutting it up.

It's almost like I need a mirror image of the horn I've got - if it bent like the alternative blue line it'd be fine...


that's odd since it fitted straight into mine with no issues.

Is that an OEM panel on the underside of the spoiler ?


If youre at the fairmile on wed then we can all take a closer look...
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Tobesetc
Barcelona


Joined: 02 Jun 2014
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PostPosted: Tue Aug 15, 2017 2:20 pm    Post subject: Reply with quote

AS far as I know it's original... but the bonnet lid was on it when I got it. The wing is original, but it's not what fouls.

Edit: I have the small aerokit tail not the ducktail... is that why?
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Tobesetc
Barcelona


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PostPosted: Fri Aug 18, 2017 7:01 am    Post subject: Reply with quote

One question before I try my first custom fabrication this weekend... what have you (911UK?) used to stick bits of trumpet together? I'm fairly sure I know what I'm going to use and I have what seems like an elegant solution in mind, but want to check if anyone had a better adhesive in mind...

If it works, there'll be a big "unveil" this weekend. If it doesn't... the thread will go very quiet Wink
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