Data Acq: Looking for TPS sensor

[timos]

I could use that Data Acquisition section that's being discussed.

Throwing this out to the masses: what's the thinnest TPS you have found/seen?

The run of the mill ones, whether throughhole or tab actuated, are all about 0.75" thick, give or take.

Gotchas:

1. I'm looking for something about half that thickness.
2. Even though it's a solid Plan B, right now I'm not looking for a string pot.
3. I could go with a tiny generic Bourns pot, find some way to attach it, and solder on wires, but I would prefer something rugged and designed for something like TPS duty.

TIA,

tim

[Rick Ross]

What is the purpose of the sensor? Is it to measure TPS for the engine ECU? Or to measure throttle pedal position for driver evaluation?

[timos]

What is the purpose of the sensor? Is it to measure TPS for the engine ECU? Or to measure throttle pedal position for driver evaluation?

Driver eval.

Yes, I can measure the pedal, but that just adds string pots or plunge sensors in the cockpit. Yes, I could have binary switch data but that's not as informative.

So it doesn't have to have ECU accuracy but it would be nice if it had *some* nuance.

tim

[Daryl DeArman]

Does the engine choice installation already have a ECU/PCM?

If so, why not just log the signal at the appropriate pin?

If not, how about a string pot on the linkage somewhere outside of the cockpit?

[TimW]

I've used these behind the pedal to get the driver info. Yes, its a plunger in the cockpit, but its easy to mount, reliable, repeatable and cheap.

http://uk.rs-online.com/web/p/products/0317780/

They're actually made in the states, but online only seem to be available from RS Electronics in the UK for $30 or from Pi for $200 previously.

Tim

[timos]

Daryl,

Carbs, and no ECU. It's prehistoric (and now SCCA illegal, due to draconian Table E changes).

Yes, a string pot is easy. See #2 on my list of wants.

tim

[Rick Ross]

Well, if you can not log this information from an ECU channel, you will have to install a sensor somewhere in the car.....so why not at the throttle pedal? Installing an analog plunger-type displacement sensor at the throttle pedal is not too difficult, probably easier (and more reliable) than a string pot.

[Daryl DeArman]

No specs here but pics might lead you to possible options to pursue:

http://www.buycheapr.com/us/result.j...nsors+position

What about a motorcycle or FI generator (just trying to think tight install applications)...

[timos]

Thanks Daryl, helpful survey.

That's more or less the same sort of search I did some days ago. I bought a couple of the cheap ones, guesstimating their size based on connector or wire visual comparisons. That's how I discovered that they are most all quite thick.

Thanks to all for the input.

tim