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Throttle Position Sensor - Rob Lentini

Note: the following information has been updated in the “R1100 Throttle Position

Sensor Tuning” article in the Super Tuning section of this manual. The following

information is intended primarily for people who wish to adjust their TPS but do

not want to change the factory sealed throttle body stop screw on the throttle

body.

Here’s what I know about Throttle Position Sensor (TPS) settings on my bike an

R1100RS. I also suspect that this information will apply to the R1100 GS, RT,

and R also.

Locate connector #1 on your TPS - it is to your right as you face the TPS or the

rear most connector (red/white wire). All of my readings were taken with a high

quality Fluke 79 Digital Voltmeter (DVM) with the positive lead to the TPS and

the negative to the engine block. I used a paper clip to probe inside the TPS

connector. Readings may be taken with the engine running or not, though I

observed a very slight (2-3mv) change between the two states. Ignition must be

on, engine cutoff switch in the on position, and the sidestand retracted to make a

reading.

The voltage range at #1 is .370 - .400 volts at idle to a smooth increase with

throttle to 4.77 volts at about 1/3 throttle opening. There is no further increase to

wide open throttle. Thus this part of the TPS appears to control idle and off-idle

primarily. Publicized idle values as set by the BMW analyzer are the source of

the above .370 - .400 figures. These values appear valid, though changes to

individual machines may be advantageous.

It appears that for machines operated primarily at higher altitudes (above

perhaps 4000 ft.), setting pin #1 TPS voltage to .370 or even slightly lower can

improve performance. Conversely, if a machine is operated at sea level, #1

could be set for .400 to fatten up the fuel/air mixture slightly.

Performance-wise here is what I observed and concluded:

-TPS #1 values of .370 or less reduce surging, reduce throttle response, and

increase backfiring tendencies. Too low a setting could cause pinging,

overheating, and catalytic converter damage.

-TPS #1 values closer to .400 or even slightly above don’t necessarily increase

surging, but they do improve throttle response and reduce backfiring. Too high a

setting could violate emissions regulations, damage a catalytic converter, and

increase fuel consumption.

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BMW R1100 Spezifikationen Seite 37