S-AFC and 3 wire TPS

[maldo]

Found some very interesting info on the limitations of the S-AFC when using the OBD-I ecu from either the '92-93 RS or Pro LX. I have been looking into why the adjustability only seems to allow for cruise and wot speeds, this fills in all the blanks. The testing has been done, now I just need to get a 3 bar MAP sensor (2 bar won't cut it as I already run 15psi...when the car runs )<P>Here is the link, you will want to scroll down to "spooler"'s post, the info is in the first 2 links.<BR><A HREF="http://www.miataforum.com/ubb/ultimateb ... 1;t=014787" TARGET=_blank>S-AFC with 3 wire TPS/460cc injectors</A>

[maldo]

Found a site with the needed info to do the MAP mod, looks very simple. This will basically apply to anyone using the S-AFC on a OBD-I ecu.<BR><A HREF="http://www.2gnt.com/www/corbin/foolafc.html" TARGET=_blank>Fooling the S-AFC</A>

[cjthor]

Would this be the same with the 94 RS? Ummm. I think I have obd2?

[maldo]

You could run it the same. Check your TPS sensor and see if it is a 3 wire or 4 wire. I believe all OBDII ecus were 4 wire, technically you shouldn't have a problem (although I have heard otherwise). You could just use the MAP sensor so it would rund of the MAP voltage basing fuel adjustments on Boost %.