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Technical Talk / Interpretation of ST Class Rule
« on: March 27, 2018, 09:34:04 AM »
Riejo & I exchanged a few messages on this topic & we decided to post this on the forum to see how others would interpret the rules. This is specific to ECU tuning for ST classing. For those that aren't aware, 2018 rules now allow boost changes. I've pasted the rules below, & my question will follow at the end.
The engine management system parameters and operation of internal combustion engines may be modified only via the methods listed below. Any OE OBD2 or newer communications port functionally must remain. The Check Engine Light (CEL) or Malfunction Indicator Light (MIL) may be disabled via software. Only sensors equipped from the manufacturer may be used for engine management. Data acquisition modifications to the wiring and PCM/ECU are permitted.
1. For all model years, the following allowances apply:
Does "without restriction" refer to parameters that may be adjusted or does it refer to the means/method of making the changes (ie. piggyback, flash tune etc).......Or does it refer to Both parameter & method
The engine management system parameters and operation of internal combustion engines may be modified only via the methods listed below. Any OE OBD2 or newer communications port functionally must remain. The Check Engine Light (CEL) or Malfunction Indicator Light (MIL) may be disabled via software. Only sensors equipped from the manufacturer may be used for engine management. Data acquisition modifications to the wiring and PCM/ECU are permitted.
1. For all model years, the following allowances apply:
- a. The standard PCM/ECU may be re-programmed without restriction.
- b. Fuel pressure regulator(s) may be replaced in lieu of electronic hardware or software alterations. It is not permitted to mechanically alter the fuel pressure regulation AND make other hardware or software changes to engine operation.
- c. Ignition timing may be set at any point on factory-adjustable distributor ignition systems.
- a. A supplementary (“piggyback”) PCM/ECU is permitted. It must be plug-compatable with the standard PCM/ECU (no splices) and must connect only between the standard PCM/ECU and its wiring harness.
- b. Electronic components may be installed in-line between the engine sensors and PCM/ECU. These components may alter the signal from the sensor in order to affect the PCM/ECU operation. Example: Fuel controllers that modify the signal from an airflow sensor.
- c. VTEC controllers and other devices may be used which alter the timing of manufacturer electronic variable-valve systems.
Does "without restriction" refer to parameters that may be adjusted or does it refer to the means/method of making the changes (ie. piggyback, flash tune etc).......Or does it refer to Both parameter & method