08 R1200GS Throttle body sync.

[pigfixer]

I have an 08 R1200GS build date 02/08, and would like to know the
correct procedure to sync my throttle bodies, Where do I start and how
do I finish ? I've looked on the web but there isn't much out there
explaining how to do this with your GS911 tool.Please let me know how
to go about this.thank you.

[Andrew Silverman]

There are multiple tools you need. Aside from the GS911, you will also need a TwinMax or similar vacuum differential gauge.

The exact procedure, and many others for hexhead BMWs, can be found in the MOA's tech forum. The throttle sync procedure is described at http://www.bmwmoa.org/forum/showthread.php?t=35446

I wrote an article on using the GS911 for routine maintenance, including the throttle sync, here:
http://www.bmwmoa.org/forum/showthread.php?t=47344

Note that if you're thinking about doing a valve adjustment, you should do that first. The throttle body sync is really the last thing you should do after all other maintenance is completed. Once it's been set properly, it tends to not require much adjustment further down the road. I did one good sync at 6K miles and haven't seen any change since.

Regards,
Andy

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[Marco S Hyman]

On Sep 5, 2010, at 2:06 PM, Andrew Silverman wrote:

> Note that if you're thinking about doing a valve adjustment, you should do that first.

And if you're not thinking of doing a valve adjustment, think again.

With the stepper motors "synched" (rarely needed, I think) checking
the idle balance (with the steppers parked, AKA "Lock idle actuators)
is not doing much more than checking the quality of your last valve
adjustment. If the balance is out of range and if there are no
air leaks then you adjust the balance by re-adjusting your valves.
They need to be the same side-to-side.

/\/\arc

[John Jensen]

And to just add my 2¢ worth on the importance of
getting the valves right BEFORE adjusting any of
the rest of the intake systemŠ

We are using the breathing of the engine itself
to dial in the intake tract. And it all starts
with the valves. If they aren't spot on then all
subsequent adjustments will attempt to compensate
in some way or other for the primary imbalance
caused by the valves not letting the breath at
its maximal efficiency.

In OVAD we go to great lengths to point this out in a number of ways.

JJ

[Michael J. Classing]

pigfixer,

This article should tell you everything you need to know.

[Don Eilenberger]

First join the BMW-MOA, then go to the BMW-MOA Forum, and
look under Hexhead/DIY section (you have to be a member to
access this) - and read the DIY I wrote.

Don Eilenberger, Spring Lk Hts, NJ BMW-MOA Ambassador
deilen...@verizon.net
NJ Shore BMW Riders web page: http://www.njsbmwr.org/
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BMWs: '01 M-Coupe, '02 M3 Convertible, '03 525iTouring, '07 R1200R