12-01-2018, 02:29 PM
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#1
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1998 Boxster Silver/Red
Join Date: Sep 2017
Location: 92262
Posts: 3,069
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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
Last edited by Starter986; 12-01-2018 at 02:51 PM.
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12-02-2018, 03:12 AM
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#2
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1998 Boxster Silver/Red
Join Date: Sep 2017
Location: 92262
Posts: 3,069
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No responses. Have I stumped the board?
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1998 Porsche Boxster
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12-02-2018, 03:14 AM
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#3
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1998 Boxster Silver/Red
Join Date: Sep 2017
Location: 92262
Posts: 3,069
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85 views.
No responses. Have I stumped the board?
This forum requires that you wait 60 seconds between posts. Please try again in 31 seconds.
Why? 
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1998 Porsche Boxster
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12-02-2018, 07:28 AM
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#4
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Registered User
Join Date: Apr 2016
Location: SE Michigan
Posts: 496
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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, Ben’s short shifter, PSE, 996 TB, UDP, stereo/ center console delete, hardtop and speedster humps, daily driver rain or shine or snow!
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12-02-2018, 07:36 AM
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#5
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1998 Boxster Silver/Red
Join Date: Sep 2017
Location: 92262
Posts: 3,069
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Quote:
Originally Posted by Boxstard
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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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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1998 Porsche Boxster
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12-02-2018, 08:00 AM
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#6
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Registered User
Join Date: Apr 2016
Location: SE Michigan
Posts: 496
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Quote:
Originally Posted by Starter986
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.
__________________
1997 Boxster arctic silver/ red, XNE riveted mahogany/ leather steering wheel & 917-style wood shift knob, Ben’s short shifter, PSE, 996 TB, UDP, stereo/ center console delete, hardtop and speedster humps, daily driver rain or shine or snow!
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09-08-2021, 03:57 PM
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#7
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Registered User
Join Date: Jun 2021
Location: Atlanta
Posts: 9
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I was thinking the same too, thus found this old thread. I considered removing it as well, just wasn’t sure on what to use to plug the hole. If I had installed an after market intake, it would be removed, so likely just for sound muffling. Doubt there would be any performance gain, and likely a loss of mpg due to making the engine purr more often!
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