Author Topic: Engine (Throttle body) Synchronization  (Read 11075 times)

j2ride

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Engine (Throttle body) Synchronization
« on: February 22, 2014, 07:16:35 PM »
How do you use the GS-911 to perform this function.

marchyman

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Re: Engine (Throttle body) Synchronization
« Reply #1 on: February 22, 2014, 09:24:14 PM »
What bike?

j2ride

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Re: Engine (Throttle body) Synchronization
« Reply #2 on: February 23, 2014, 05:56:58 AM »
Bike is 2006 R1200RT
Jim

marchyman

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Re: Engine (Throttle body) Synchronization
« Reply #3 on: February 23, 2014, 06:49:09 AM »
The stepper motors that control the idle balance and RPM can get out of sync.  The GS-911 can do an Idle Actuator Calibration.  See See http://www.hexcode.co.za/techinfo/iac

After than the stepper motors should be locked before you check that the side-to-side differences are within spec.   See the last screenshot on this page for more info: http://www.hexcode.co.za/products/gs-911/support/manual/user-manual/the-gs-911-application/using-gs-911

Actual adjustment of off idle sync is done by adjusting the throttle cable
* With a fully closed throttle there should be about 0.5 ~ 1.0 mm play regardless of handlebar position.
* At idle 25 mbar max diff. If > 25 mbar check for air leaks or valve mismatch.
* Check both sides rise and fall together. Any mismatch is constant through the rpm range.  Adjust right side if necessary. 
* Max mismatch off idle is 15 mbar at 1400-1800 RPM. 

You will need some kind of manometer of vacuum gauge to check the levels.

Absolutediver

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Re: Engine (Throttle body) Synchronization
« Reply #4 on: April 12, 2014, 01:42:05 AM »
I have a 2012 R1200GS with 12,000 miles or 20,000 KM.  I just did the first big service, all is well with the bike.  My GS-911 showed NO fault codes, I did the IAC, several other tests and reset the service date and miles.

I did a TBS with a manometer and did not use my GS-911 but I'm not sure if I got it 100% correct.  I'm going to redo it with the GS-911.

At what RPM level do you run the engine at when doing the TBS with a GS-911?

I know that you are not supposed to turn off the engine while doing a TBS with a GS-911.  What do you do if the engine gets to hot?

Thanks for any and all help,

Absolutediver

Jughead

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Re: Engine (Throttle body) Synchronization
« Reply #5 on: April 21, 2014, 06:55:30 PM »
I have a 2012 R1200GS with 12,000 miles or 20,000 KM.  I just did the first big service, all is well with the bike.  My GS-911 showed NO fault codes, I did the IAC, several other tests and reset the service date and miles.

I did a TBS with a manometer and did not use my GS-911 but I'm not sure if I got it 100% correct.  I'm going to redo it with the GS-911.

At what RPM level do you run the engine at when doing the TBS with a GS-911?

I know that you are not supposed to turn off the engine while doing a TBS with a GS-911.  What do you do if the engine gets to hot?

Thanks for any and all help,

Absolutediver

The problem with doing a TBS without the gs911 is that the idle bypass valves will constantly try to compensate for any differences between the throttle bodies.

These valves need to be locked so that the cannot move while you are doing the adjustment.

TBS can be done at anything over 1500rpm.  I usually do it at normal running rpm or somewhere around 4500rpm.  I use a large industrial fan in front of the bike to create airflow across the cylinders.  Even so, exhausts do get pretty hot.  It is not necessary to keep the rpm that high.  I normally raise the rpm, check the gauges, the go back to idle while adjusting the RHS cable.  Then back up to 4500rpm to check the gauges again.

All told, the process never takes more that 2 or 3 minutes if the proper preparation has been done.

Absolutediver

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Re: Engine (Throttle body) Synchronization
« Reply #6 on: May 19, 2014, 02:44:40 PM »
2012 R1200GS with 12,000 miles

NAILED IT!!!

I redid the TBS with the GS-911 and my home made manometer.  I had (4) house fans pointed at the engine which kept it cool enough.  Took me 3 ---> 4 minutes at 3,000 RPM.

I got both sides of the manometer tube almost EXACTLY even.  I think the right side might have been 1/4" higher but compared to several inches before doing the TBS with the GS-911, this is EXCELLENT.

Before the TBS I was averaging 43 ---> 46 MPG.  After the TBS I'm averaging 49 ---> 52 MPG.