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S4/GT/GTS throttle body

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Old 05-17-2013, 05:55 AM
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John Speake
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Default S4/GT/GTS throttle body
Does anyone have the internal diameter of the S4/GT/GTS throttle body ??

Euro S 84-86 is 82mm.
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Old 05-17-2013, 06:42 AM
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Cheburator
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Originally Posted by John Speake
Does anyone have the internal diameter of the S4/GT/GTS throttle body ??

Euro S 84-86 is 82mm.
If you can wait till I get home tonight - I have one split on the workbench off my old GTS engine, so will measure it...
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Old 05-17-2013, 07:00 AM
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John Speake
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Thanks Alex - that would be appreciated if no-one else has the figure to hand ...
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Old 05-17-2013, 07:45 AM
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PHIL928
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The internal diameter where the rubber boot fits onto the throttle body is exactly 80mm then it tapers to roughly 75mm where the butterfly valve is
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Old 05-17-2013, 08:27 AM
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John Speake
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Many thanks ! I'm surprised it is that small.....


Originally Posted by PHIL928
The internal diameter where the rubber boot fits onto the throttle body is exactly 80mm then it tapers to roughly 75mm where the butterfly valve is
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Old 05-17-2013, 06:52 PM
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Bigfoot928
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It is actually 74mm..... they can safely be machined out to 79mm....
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Old 05-17-2013, 07:17 PM
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Rob Edwards
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C'mon Sterling, gotta reference your own work! How else are you going to bump your publication impact factor?

http://928sg.com/intake.htm
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Old 05-18-2013, 11:23 AM
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John Speake
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Thanks to everyone for their comments...
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Old 05-18-2013, 02:36 PM
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mark kibort
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Originally Posted by 928sg
It is actually 74mm..... they can safely be machined out to 79mm....
when you machine it out, what do you do for the butterfly plate? get a larger one, or weld to the existing one? just curious.
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Old 05-18-2013, 02:46 PM
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Lizard928
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You make a new one with a dremel MK.......
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