Throttle body porting
Thread Starter
Pro
Joined: Jun 2003
Posts: 702
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From: Castle Rock Co
Throttle body porting
I picked up a used TB to port. What I'm wondering is if the throttle motor needs to be removed, or if its "non-serviceable" Part of the reason I bought the extra TB was to have a spare motor.
Instructor
Joined: Sep 2003
Posts: 104
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Re: Throttle body porting (Heretic)
I picked up a used TB to port. What I'm wondering is if the throttle motor needs to be removed, or if its "non-serviceable" Part of the reason I bought the extra TB was to have a spare motor.
My '97 A4 was professionally ported specifically for automatics to keep the idle speed near stock and still increase flow by removing the "lip" above the throttle blade. Idle is about 600 in gear when at normal operating temp, and it has very little surge or overspeed when cold. My engine is stock except for Corsa exhaust and Z06 intake plumbing.
I beta-test C5 ported TBs, and this is the most drivable one I've ever had. It's completely "invisible" in normal driving. Well, the bright red powdercoat sorta stands out; my preference is semi-gloss black to match the rest of the intake system.
[Modified by OldSStroker, 6:21 PM 10/28/2003]
[Modified by OldSStroker, 6:22 PM 10/28/2003]
Thread Starter
Pro
Joined: Jun 2003
Posts: 702
Likes: 0
From: Castle Rock Co
Re: Throttle body porting (OldSStroker)
My belief is that anything mechanical will fail, its just a question of when.
Anyways, porting the lip out and smoothing everything was what I was going to do.
So if I get the anti-tamper torx bit the motor will come off?
Anyways, porting the lip out and smoothing everything was what I was going to do.
So if I get the anti-tamper torx bit the motor will come off?
Instructor
Joined: Sep 2003
Posts: 104
Likes: 0
Re: Throttle body porting (Heretic)
My belief is that anything mechanical will fail, its just a question of when.
Interesting outlook. FWIW, throttle-by-wire components necessarily are sourced by the OEM with very high mean failure times. There are probably many other things on a C5 which will fail first. Check out the motor and gears when you get it apart. Notice how the spring loaded close point is a few degrees open. This is the "fail-safe" postion which allows you to continue to drive the car to a safe stop if (or when :) ) the motor fails. Fortunately computer controlled engines have a number of backup or "limp-home" modes.
Anyways, porting the lip out and smoothing everything was what I was going to do.
So if I get the anti-tamper torx bit the motor will come off?
Yep. Save the grease and gasket.
Good luck!
Interesting outlook. FWIW, throttle-by-wire components necessarily are sourced by the OEM with very high mean failure times. There are probably many other things on a C5 which will fail first. Check out the motor and gears when you get it apart. Notice how the spring loaded close point is a few degrees open. This is the "fail-safe" postion which allows you to continue to drive the car to a safe stop if (or when :) ) the motor fails. Fortunately computer controlled engines have a number of backup or "limp-home" modes.
Anyways, porting the lip out and smoothing everything was what I was going to do.
So if I get the anti-tamper torx bit the motor will come off?
Yep. Save the grease and gasket.
Good luck!
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