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Re: Add a resistor to TPS circuit?

At 11:33 AM -0500 1/28/05, Ben Barkow wrote:
>I'm a newbie, but...
>The surging seems to be associated with small throttle openings (but not
>idle... I'm not sure what "idle surging" would feel like) and closed-loop
>operation with the O2 sensor contributing its 2 cents worth.
>One fix is to twist the TPS, thereby fooling the ECU into thinking the
>butterfly is more open than it really is (and thus fooling the ECU into
>spritzing more gas into the mix). But that's a pretty blunt instrument and
>enrichens the mix all through the range.
>Folks at ease the basic math and a soldering iron, might suggest that adding
>a resistor in the circuit with the TPS potentiometer could influence the
>small-opening voltage but have rather less effect on the larger openings.
>Anybody tried that? Anybody know the resistance value of the TPS pot?

Cheers, Ben, and welcome to the Dark Side.

You'll many very good discussions on TPS circuitry at advRider.com, 
look in the GSpot forum there, and search on the term "TPS". 
Contributors you can trust are "JohnJen", "R Dubb", and "Poolside", 
to name only three that first come to mind.

Amongst the material there are reproductions of the TPS circuits and 
links to the OEM Bosch parts where the circuitry is explained.

- -- 
- - andrew, Berkeley, '00 R1150GS
- - "Moto per Mangiare, Mangiare per Moto"