Variable TPS
 

I needed to install one the other day, so I collected some info on the subject and put it online on my site.

Variable TPS | Frank's Westfield MX5 Variable TPS | & Megasquirt site

Nice as usual... I even gave you a positive prop... :makeout:

good info; thanks!

I actually LOLed :giggle:

The #2 bmw was pnp (with fun bracketry, pnp wiring wise) on my install. It had to face backwards, towards the firewall to fit and rotate properly, and I believe that the voltage signal was reversed because of this. But it worked ok without switching any wires and such. Mine got some weird noise when it was cold outside, Im not sure what caused that issue.

By 'voltage signal was reversed', do you mean that your tps is indicating backwards? 100% with no throttle and vice versa?

yes.

thx, I'll add that the wires need swapping then.
Out of curiousity, how does MS react to a reversed tps, since you didn't swap the wires?

Good info! I have been looking for another tps to replace my Wells unit, and the Vishay/Wabash tps in your writeup looks perfect.

Does anyone know a source in the U.S. for the Vishay tps? I have checked the digikey, mouser, and farnell part catalogs.

I bought mine from RS components. Don't know if they operate in the US as well though.

I did a 91 tps conversion this week with a tps201. It works but I'm already worried that if I stomp the throttle hard enough a few times it's going to shave that tooth off. I'm gonna try to hunt down the vishay one I think, looks like a better way to go. Thanks for the info, good stuff.

RS-components has a U.S. distributor named Allied Electronics. After some searching I found the Vishay/Wabash tps only by the part number 971-0002. It is not listed by either manufacturer name nor with a picture.

Search results for "971-0002" - Allied Electronics

MS threw a short pissy fit iirc, but once it was calibrated it worked fine. Only thing to note, if you disconnect it, you may have fuel cut due to flood clear mode during cranking.

I used #1 which was plug and play fit (wiring excepted) and I pulled it from some early-mid nineties 5 series auto.

fill that spot with epoxy?

good luck finding the vishay.

I didn't ever find a vishay w/o ordering from the UK. Yeah I filled in the space with liquid nails. Works fine so far.

Check the link I posted above. The Vishay tps part number #971-0002 is available from Allied Electronics which is the U.S. distributor for the R.S. Components (where Frank found it). The part numbers are the same and the price is the same at 60 usd on both websites, but the Allied site lacks a picture of the tps in their catalog.

R.S. Components Vishay tps link: http://uk.rs-online.com/web/p/precis...633D4E4F4E4526

Nevermind. Allied changed the availability of the tps to out of stock since I posted that link.

They probably sold a bunch of them in the last couple of weeks :giggle:

If anyone has found other vtps that work, please add the info here.