Subarutex Posted December 4, 2003 Share Posted December 4, 2003 Ok guys, I need a complete rundown of all the functions of what the stock ECU does in my '87.5 RX. Fuel injection.. Fairly obvious it does, what else? Quote Link to comment Share on other sites More sharing options...
Skip Posted December 4, 2003 Share Posted December 4, 2003 Tex, fuel injection covers cold start enrichment, fuel pump, boost enrichment, boost control via the wastegate solenoid (it can if it deems nes. increase the max boost pressure) and fast idle speed The other major system is spark control, timing advance and knock retard are controlled solely by the hot wire MAF ECU with it's optical crank angle sensor distributor (unlike the vane style pre 87 systems whose dist has vacuum and mechanical controls and a stand alone knock control unit) There are other minor systems which have connections to the ECU (AC and transmission) Hope this answers your question somewhat. Quote Link to comment Share on other sites More sharing options...
Subarutex Posted December 4, 2003 Author Share Posted December 4, 2003 hmmm, ok I'm contemplating building a Megasquirt fuel injection computer, and I'm wondering if I need to keep the stock ecu. Looks I would have to. Wish there was a simple way to isolate the system... any ideas? Quote Link to comment Share on other sites More sharing options...
archemitis Posted December 4, 2003 Share Posted December 4, 2003 isolate? as in just run your fuel off of megasquirt? you could do that with a carb, or a pre 87 mpfi disty. Quote Link to comment Share on other sites More sharing options...
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