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- - Vtps Help? (https://www.miataturbo.net/megasquirt-18/vtps-help-63120/)

Hey guys im finally in the ms club, its installed and almost ready. but i was finishing installation on the bmw vtps and checking calibration, its reading 200s at closed throttle and and 30s at WOT. its in flood clear mode at closed throttle what did i screw up. i used this guide

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You will need to source a linear TPS from the aftermarket or from another application. The easiest swap is probably a BMW TPS Bosch part # 0-280-120-402 from an auto E30 or E36, or Bosch #0-280-120-406 from an E32. Both of these should bolt on your miata TB w/o modification. You will need to adapt the wiring harness to accomodate.

The BMW pinout is:
Pin 1-black wire-5volt in
Pin 2-shielded wire-ground
Pin 3-yellow wire-signal out
Pin 4-ground
Pin 5-WOT switch
Pin 6-Closed switch
_
6 1
5 T 2
4 3
Depending on your harness, you'd want:

Pin 4 or 2* to go to the black/grn wire - this is a ground. * Not sure which you need to use.

Pin 1 to go to your R wire - this goes back to 1N on the ECU harness and should connect to 5vref from the MS.

Pin 5 to go to your LG/WHt wire - this goes back to 2L on your ECU harness and should connect to the TPS input to the MS.

A reversed reading usually indicates that the +5 (Vref) and GND wires have been reversed.

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Originally Posted by Joe Perez (Post 827332)

A reversed reading usually indicates that the +5 (Vref) and GND wires have been reversed.

cool, i though something has been reversed but i wanted to dumb check not trying to damage the thing. thanks joe

one more quick thing, sorry im on my phone so searching is near impossible. what should the calibration numbers be?

Varies for each car, but something like the opposite of the values in your first post. As long as you get a decent sweep of the TPS gauge from 0 to 100%, you're good.

Yup. It's unlikely you will ever see 0 with the throttle closed and 255 with it fully open (those are the limits, and if you are actually hitting them then your TPS is physically mis-aligned) but you should see a low number when closed (maybe somewhere between 10 and 50) and a high number when fully open (maybe 175-225).

Those numbers are just ballpark estimates. The exact values are not important, so long as you're not hitting either limit and seeing the value grow as the throttle opens.