Is this a Throttle Position sensor?

[JohnJL]

Sorry, I meant to post this only to the main 911 forum. Apologies to everyone for double-posting.

Is that a TPS on the side of my throttle body? 3.0 SC, believed to be an 83 TB. Sorry, no part numbers printed on it, but does say "Bosch"

If so, anyone have specs on current/slope, connections?

thanks

[JohnJL]

ps. I have checked the archives and see shuie and others' posts, but no specs on % = ? voltage

[mb911]

yup thats it if you need one let me know I have an extra one

[stlrj]

If you pop the cover, you will see a set of normally open and normally closed contacts which makes it an old fashioned throttle switch. Most modern cars us a potentiometer or rheostat which more accurately tells the ECM the throttle position.

Joe

[Mike Bonkalski]

That type of TPS won't work with Megasquirt. From the Megasquirt installation manual:

"You will need a TPS that is really a potentiometer and not a switch. Many older cars had idle or WOT position switches instead of a real TPS. A real TPS gives a continuously varying signal with changing throttle. There are two wires on the external wiring schematic that go from MegaSquirt into the TPS sensor. These two MegaSquirt wires are +5 Vref signal and a sense line. There is a third wire going to ground. Assuming that you have a proper potentiometer TPS, then +5 Vref goes to one side of the pot, the other side goes to ground and the sensor line is hooked to the wiper."

I assume this is the reason why Bitz Racing's kit doesn't make use of a TPS sensor.

[JohnJL]

Thanks everyone.

Yes, this is for MS. Anyone know of a drop-in replacement that is a true potentiometer?

[vizail]

You can check if this T-Switch is working with a Volt meter. It's really easy ..!

Vic

[mudman]

ford 5.0 tb? readily avail, cheap
-jeremy

[JohnJL]

Thanks everyone. Mine is indeed a switch (one connection off idle, another above half throttle).

Has anyone found a TPS that fit right on the throttle shaft for the 3.0s?