The Post-Haste Performance Toyota Aristo #PHPJZS147 gets an ECUMasters EMU Standalone Engine Management System!
Since our last Fuel System upgrades on our PHP Aristo we had to find an Engine Management solution. This wasn’t as easy as it could have been due to the Aristo having an Electronically controlled Automatic Transmission. Toyota had bundled both Engine and Transmission computers into the same ECU which complicated matters.
Our solution was to run a Standalone Engine Management ECU wired in “Parallel Mode”. Wiring the EMU Standalone in Parallel is similar to how you would wire in a “Piggyback” but instead of splicing into the Ignition and Injector Harness, they are cut and fed direct from the EMU.
The EMU has full control over Ignition Angle, Spark Supply, Injector Control as well as all the usual “Standalone” features such as Wideband Feedback, Closed Loop Boost, and Dual Band Knock & Launch Control. The Toyota ECU has been left to task the less exciting things like Idle and A/C but most importantly Transmission Control. The Toyota ECU “thinks” its still running the car so shift points, line pressure and kick down schedules are unchanged.
Everything is wired with Deutsch Connectors allowing us fast switch overs between different Aftermarket ECU’s or even back to the OEM ECU for diagnostics purposes. This allows us to use this modest old Toyota as a test bed for some of the latest management systems from a whole range of manufactures.
We’ve now got over 1000 miles (1600KM’s) on this setup and drive ability has been excellent.