BMW Series 3 E30
BMW Series 3 E30
BMW Series 3 E30
This is a guide to upgrade the Motronic ECU fitted to BMW's E30 3-Series (1988 to 1991) using the after market ECU Megasquirt, and a Coil Pack for Wasted Spark. The model used in this guide, is a UK spec 1989 325i. Other models may very, particularly those models that use the pre-88 Jetronic system, which will require additional work.
Background
The Motronic ECU fitted to BMWs in the late 80's whilst reliable, is somewhat outdated now. It relies on an Air Flow Meter for air intake measurement, which is more restrictive to air flow than a more modern MAF sensor. Megasquirt takes this a step further, and uses a MAP Sensor instead, removing the need for any air measurement. Megasquirt also opens the door to using an alternative ignition system, such as Wasted Spark. For the price of a new BMW distributor cap and rotor arm, Wasted spark can be added to the Megasquirt system, boosting performance (a stronger spark) and reliability (no contacts to wear out).
Background
The Motronic ECU fitted to BMWs in the late 80's whilst reliable, is somewhat outdated now. It relies on an Air Flow Meter for air intake measurement, which is more restrictive to air flow than a more modern MAF sensor. Megasquirt takes this a step further, and uses a MAP Sensor instead, removing the need for any air measurement. Megasquirt also opens the door to using an alternative ignition system, such as Wasted Spark. For the price of a new BMW distributor cap and rotor arm, Wasted spark can be added to the Megasquirt system, boosting performance (a stronger spark) and reliability (no contacts to wear out).
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