TPS Sensor

[Gmsdnga]

After looking through the search results, I did not really find an answer.

The 1200cc in my race quad runs the 36mm with the TPS (2001 year). The new 38mms I am installing do not have this. What exactly is the TPS doing? What will it do disconnected?

Thanks!

[TonyGee]

16 minutes ago, Gmsdnga said:

After looking through the search results, I did not really find an answer.

The 1200cc in my race quad runs the 36mm with the TPS (2001 year). The new 38mms I am installing do not have this. What exactly is the TPS doing? What will it do disconnected?

Thanks!

it does feck all, ive run a few B12's with the TPS connected and disconnected and I can't tell for the life of me any difference. 

[Gmsdnga]

Perfect! Thanks brother.

[TLRS]

Could it be for anything else then ignition timing?

[Arttu]

It's for igintion timing. Most likely it adds timing for low throttle. Improves fuel efficiency and maybe emissions too.

I guess the ignition box is designed so that it reads full throttle position if the sesnor is disconnected and therefore uses safer full throttle timing. But if I would use such system without the sesnor I would ensure that by connecting the signal wire to 5V wire. Or leaving the sensor there and locking it to full throttle position. 

[fatblokeonbandit]

It’s dose fek all, as Tony said, many years ago I was dynoing my B12 after lots of stuff being fitted in the engine, between runs I unplugged the tos sensor, guess what happened, ?.

nowt, nothing, bugger all…

[TLRS]

There’s a distributor on my car with a vacuum timing adjustment thingy. Iirc it helps burn fuel better at cruising speed. Ignites it earlier because it burns slower or something.

[Peterv]

here's wikipedia for ya...

 

A throttle position sensor (TPS) is a sensor used to monitor the air intake of an engine. The sensor is usually located on the butterfly spindle/shaft, so that it can directly monitor the position of the throttle. More advanced forms of the sensor are also used. For example, an extra "closed throttle position sensor" (CTPS) may be employed to indicate that the throttle is completely closed. Some engine control units (ECUs) also control the throttle position by electronic throttle control (ETC) or "drive by wire" systems, and if that is done, the position sensor is used in a feedback loop to enable that control.^[1]

Related to the TPS are accelerator pedal sensors, which often include a wide open throttle (WOT) sensor. The accelerator pedal sensors are used in electronic throttle control or "drive by wire" systems, and the most common use of a wide open throttle sensor is for the kick-down function on automatic transmissions.

Modern day sensors are non contact type. These modern non contact TPS include Hall effect sensors, inductive sensors, magnetoresistive and others. In the potentiometric type sensors, a multi-finger metal brush/rake is in contact with a resistive strip,^[2] while the butterfly valve is turned from the lower mechanical stop (minimum air position) to WOT, there is a change in the resistance and this change in resistance is given as the input to the ECU.

Non contact type TPS work on the principle of Hall effect or inductive sensors, or magnetoresistive technologies, wherein generally the magnet or inductive loop is the dynamic part which is mounted on the butterfly valve throttle spindle/shaft gear and the sensor & signal processing circuit board is mounted within the ETC gear box cover and is stationary. When the magnet/inductive loop mounted on the spindle which is rotated from the lower mechanical stop to WOT, there is a change in the magnetic field for the sensor. The change in the magnetic field is sensed by the sensor and the voltage generated is given as the input to the ECU. Normally a two pole rare-earth magnet is used for the TPS due to their high Curie temperatures required in the under-hood vehicle environment. The magnet may be of diametrical type, ring type, rectangular or segment type. The magnet is defined to have a certain magnetic field that does not vary significantly with time or temperature.

[Peterv]

ok above doe'snt meane shite to me aswell , just a typial engineer's take on things..

so making it more difficult to read then it allready is..

 

this read I found more clearing..

https://www.autonationmobileservice.com/blog/throttle-position-sensor/

 

it's basicly a ignition advancer/retarder  to  let you burn the fuel more efficiently  , me thinks more of a eco-thing  , I never heard of people 

noticing it when its disconnected or malfunctioning..

 

cheers

 

Peter

 

 

[Upshotknothole]

Was strictly added for emissions. If it does fuck all on the bandit it's probably only at a certain small RPM range where they test the emissions at. Same as things like secondary air injection or carbon canisters, pull it all and toss it in the bin.

[Arttu]

Well, if the ignition box reads removed sensor as "full throttle" then you won't notice anything else than maybe increased fuel consumption. And apparently this is the case usually since I haven't heard about any problems either.

But if the ignition box happens to read it as "closed throttle" when you are actually on full throttle then your pistons will probably notice it... I once measures timing curves from a SV650 which also has a TPS with carbs. In that case added timing on part throttle was pretty serious, 15-20 degrees if I recall correctly.  So better to pay at least some attention when removing the sensor. For example leaving the sensor connected but hanging free on the wires might be a bad idea.