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AEM Engine Position Module

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AEM Engine Position Module

$321.30 $416.66 You Save $95.36 (23%)
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AEM ENGINE POSITION MODULE -- Dual optical trigger style; Elastomer module material, black module finish, billet aluminum housing material, natural housing finish, iron gear material; Made from 6061 ...(see more)
  • Brand SKU#: AEM 30-3255
  • Quantity Sold: Sold Individually
  • Anticipated Ship Out Time: 1-2 Business Days

Select more AEM parts under Electronic Control Modules, Ignition & Distributors from list below.

AEM Engine Position Module Review

Date Published:
  • Performance 4.5
  • Ease to Use/Intallation 3.5
  • Quality 5
  • Price 4
Overall Rating 4.3

AEM is well-recognized for its line of aftermarket performance products, and one of its latest offerings is the AEM engine position module. Also known as the EPM, the engine position module replaces the stock engine distributor and allows for the use of coil-on-plug or wasted-park ignition systems, which in turn can result in increased horsepower output from the engine. We managed to acquire several of these modules from AEM and put them to the test.


  • Provides precise engine position via dual zero-speed optical sensors
  • Can be used with any aftermarket EMS that recognizes the 24 & 1 pattern for crank and cam signals
  • Bolt-on systems available for all Chevy small block and big block engines, Ford 5.0L small blocks with EFI (1986-93), Ford 351 Windsor, 289 and 302 small block engines, and Honda B-, D-, H-, and F-series race engines
  • Four-wire connection (12V, ground, crank signal, and cam signal)
  • Output signal amplitude and waveform remain constant at all RPM
  • Shock-absorbing elastomer drive system
  • 24-tooth crank with 1-tooth cam pattern (Pattern available in cam/crank sensor wizard in AEMPro/AEMTuner/InfinityTuner)
  • 6061 T-6 billet aluminum construction
  • Limited AEM warranty

The upside

  • Precise, reliable performance. The module's optical sensors generate signals immediately regardless of the speed of the engine. In addition, each module comes with a special elastomer drive system that effectively protects against engine timing deviations and vibrations.
  • AEM's module easily adapts to any positive drive, half-engine speed devices. We tried this EPM on cars with cam and distributor drives, and it performed well on both instances.
  • User-friendly design. The module's simple four-wire connection makes it easy to install, while its crank's 1-tooth cam pattern makes it easy to set up and increase the module's accuracy.

The downside

  • Only works on a selected few vehicle makes. Currently, the AEM engine position module supports specific Chevy, Honda, and Ford engines. We are hoping that AEM would introduce support for engines manufactured by other automakers as well.
  • May damage the engine if improperly installed. This device is definitely not recommended for those with little or no experience in engine performance tuning.

The bottom line

The AEM engine performance module is a great alternative for car owners who are looking for an additional horsepower boost from their engines. It is especially ideal for weekend racers on a budget as the EPM allows for a more efficient horsepower output without requiring a major overhaul of the engine.

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