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VDSTS and TPS

G

Guzziolsen

Tuned and Synch'ed
Joined
Mar 10, 2011
Messages
33
Hallo

I have just used my new dianostic tool VDSTS to reset TPS on my Griso 1100. After reseting, the TPS with cloesd trottle was 4.6 and 82.2 fully open.The manuel from Technoresearch says that the the TPS reading should be 4.5 to 4.9 with closed trottle and 84.2 to 84.5 fully open. I can se that somebody has removed the yellow paint/seal from the trottle-stop screw, so the factory settings can have been altered. The bike drives fantastic, so do I have to do anything about the 82.2 at fully open trottle?

Steffen
 
Is the stock TPS installed? Jeff_B recently posted an article comparing the Harley TPS with the Guzzi one. The Harley one (from memory) ran out before full throttle position. Do a search on HD-TPS-Jeff_B.

Edit: Bugger, didn't work for me either. Perhaps someone (or Jeff_B) can point to it?
 
If it runs well leave it alone. It does sound like someone did move the "sacred screw". The software sets the TPS electronically. It seems the screw was turned in (raise idle) since the full sweep is not available. Most Marelly ECUs consider 80.5 degrees to be wide open throttle, so I wouldn't worry about your top reading. All this is telling me is the TPS is telling the ECU a throttle position is less than it actually is. Not necessarily all bad.
 
I think I have the answer, GrahamNZ have written this in Home-tuning a Breva 1100 etc.


What to do if the throttle stop screw has been tampered with
You can tell if the in-hex headless screw (the “sacred screw”) has been tampered with if its head is no longer filled with yellow paint. Here is a method of resetting the "sacred screw".
• Using VDSTS reset the TPS as described earlier.
• Close both air bypass screws.
• Using a vacuum gauge set, balance the throttle vacuum as described earlier.
• Reset the TPS again.
• Use the air bypass screws to balance the idling vacuum. At this point you know that the throttles are balanced mechanically and electronically.
• The idling speed now is likely to be too high or too low but otherwise the engine should throttle well. To set the idling speed to the correct 1100 to 1150 RPM adjust the sacred screw as necessary.
• Reset the TPS again. This is necessary because the TPS will have moved relative to the left throttle position as set by the sacred screw.
• Fine tune the idling vacuum again using the air bypass screws.


Thank you Graham and John
 
It's unusual for the need to raise idling using the sacred screw, unless the stepper motor has been removed. All my experiences have been to reduce the idle speed with the screw, as as far as I know there is no other way.

Just how "sacred" is this sacred screw? If it was that sacred, it would be blanked off by the manufacturer, like the idle mixture screws used to be in the misguided days of carburettors and emission control.

But I agree with John. If it ain't f@#*ked, don't fix it.
 
I´m gonna tjek the idle this afternoon, if the idle is over 1150 RPM, do I then have to reduce the idle speed with the "sacred" screw, or is it okay if the idle is near 1200 RPM?
 
Guzziolsen said:
I´m gonna tjek the idle this afternoon, if the idle is over 1150 RPM, do I then have to reduce the idle speed with the "sacred" screw, or is it okay if the idle is near 1200 RPM?
Click to expand...

The CARC bikes should be idling higher than the older bikes. 1200 to 1400 RPM is just fine.
 
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