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Old 12-01-2018, 03:29 PM   #1
1998 Boxster Silver/Red
 
Join Date: Sep 2017
Location: 92262
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Purpose of this part...

The Throttle Valve Tube Pipe. It is connected to the intake tube. Part # 99611024200

It's a tube to nowhere. I noticed this when I had out my throttle body and connecting tubes to the plenums.

1. What purpose does it serve?

2. What would result in its absence?

Thank you.

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1998 Porsche Boxster
1986 BMW 325es
2012 Ford Edge Sport

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Last edited by Starter986; 12-01-2018 at 03:51 PM.
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Old 12-02-2018, 04:12 AM   #2
1998 Boxster Silver/Red
 
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No responses. Have I stumped the board?
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1986 BMW 325es
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Old 12-02-2018, 04:14 AM   #3
1998 Boxster Silver/Red
 
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1998 Porsche Boxster
1986 BMW 325es
2012 Ford Edge Sport

"Ignore the guilt, and take your turn"
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Old 12-02-2018, 08:28 AM   #4
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Since you are dying to get response... I think the part is for flow noise/ resonance/ pulsation management, very common feature with other cars too.

With above said, I do not recall that my 1997 has one, maybe only for Tiptronic cars? Mine has the helmholtz chamber right by the throttle body, basically for the same purpose.

If you do not understand it, just trust what Porsche did and leave it alone.
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1997 Boxster arctic silver/ red, XNE riveted mahogany/ leather steering wheel & 917-style wood shift knob, Benís short shifter, PSE, 996 TB, UDP, stereo/ center console delete, daily driven shine or snow.
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Old 12-02-2018, 08:36 AM   #5
1998 Boxster Silver/Red
 
Join Date: Sep 2017
Location: 92262
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Quote:
Originally Posted by Boxstard View Post
Since you are dying to get response... I think the part is for flow noise/ resonance/ pulsation management, very common feature with other cars too.

With above said, I do not recall that my 1997 has one, maybe only for Tiptronic cars? Mine has the helmholtz chamber right by the throttle body, basically for the same purpose.

If you do not understand it, just trust what Porsche did and leave it alone.
The reading I did pointed to it being exclusive on the Tip... which is what I have. I'll buy the flow noise, etc. explanation as that seems to be the purpose of the intake tube muffler as well.

Yeah... I'll trust what Porsche did and leave it alone. I believe the intake muffler and that tube were added to comply with European noise mandates. Period.

I find it odd that it is resident only upon the tips...

Next?
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1986 BMW 325es
2012 Ford Edge Sport

"Ignore the guilt, and take your turn"
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Old 12-02-2018, 09:00 AM   #6
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Quote:
Originally Posted by Starter986 View Post
The reading I did pointed to it being exclusive on the Tip... which is what I have. I'll buy the flow noise, etc. explanation as that seems to be the purpose of the intake tube muffler as well.

Yeah... I'll trust what Porsche did and leave it alone. I believe the intake muffler and that tube were added to comply with European noise mandates. Period.

I find it odd that it is resident only upon the tips...

Next?
I thought the intake snorkel was for Euroan noise regulation, not the chamber that enhances the flow.

Throttle won't close and open at each gear shift as manual, especially our early models with cable throttle, so intake flow dynamic and tuning can be unique for each tranny.

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