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Electromotive TEC GT Engine Management System

this part is Pikes Peak tested this part is Bonneville TestedInstallation Instructions Available Video Available

First off, I have to say that you produce a series of amazing products. I just got my management system the other day and the instructions appear clear, and the parts are all well-crafted, including the fuel rails and the distributor cover plates. Thomas V.

The 928 Motorsports TEC GT Engine Management System (EMS) kit is a complete replacement for all of these items on your 928:
  • The entire stock ignition system
  • The entire stock fuel injector system
  • The entire fuel injector wiring harness
  • The distributor caps, ignition coils, and spark plug wires
  • The stock LMB (injection) computer
  • The stock EZK (ignition) computer.
  • The stock MAF (Mass Air Flow) Sensor

There are two reasons to upgrade to the 928MS TEC GT Engine Management System:

The TEC GT kit for the Stock 928 Owner
The TEC GT kit for the Tuner/Performance Enthusiast

The TEC GT kit for the Stock 928 Owner
Perhaps you are starting to experience these costly issues with your 928; a broken and damaged injector wiring harness, a MAF sensor that need rebuilding or replacing, or an EZK or LMB computer that needs replacing.

These items are expensive, and they aren't getting any younger nor easy to find, either. Additionally, even when all these pieces of the original ignition and fuel systems are in tip-top shape, they still represent the state of technology available the year your car was built. In contrast, after you have installed our kit your engine management will be up-to-date with the latest and most reliable systems available.

Our kit will replace both the EZK (ignition) and LMB (fuel) computers with this one fully-integrated system, and will include the necessary adapters to use as many of the stock sensors as we can so it will be very plug-and-play. For example, our kit uses the stock 60-minus-2 timing ring and the stock inductive pickup, vastly simplifying the install. Our kit is distributerless and features 2 coil packs with coil-near-plug technology.

This all-new and fully modern EMS is away to lower the cost of ownership and increase the reliability (and enjoyment) of your 928.

The TEC GT kit for the Tuner/Performance Enthusiast
For those performance enthusiasts that keep pushing the 928 into higher HP and greater performance, our complete kit will exceed the output of any piggy-back electronics or EPROM burner.

And think about it - for a little more than the price of an EPROM burner, you get rid of all that old crumbling wiring, old coils, and limited capabilities and replace all of it with all new, powerful and versatile equipment.

The 928MSTEC GT system will support Superchargers, Turbochargers,modified intakes and large lumpy cams. One limitation owners of boosted cars report is the point where the MAF sensor can no longer measure air flow.Its simply maxed-out, and cannot "see" the additional air being delivered, and so cannot supply the matching fuel. Now the MAF will be gone (along with its restrictions) and you can tune the high-boost application correctly.

Some other features:
  • Direct-fire coil-near-plug distributerless ignition, with significantly higher firing voltages and spark duration. The DFU's are completely weather-proof and their firing is controlled far more precisely than distributor-equipped systems.
  • The fuel map has 256-point high resolution interpolation between data points, and adjustments up to 0.001 millisecond. Much greater resolutions than the old stock LMB fuel computer.
  • Spark timing is precisely controlled under all conditions, including rapid engine acceleration (system counts 3,060 points in one revolution of crankshaft), Much higher resolution than the stock EZK ignition computer.
  • Long, 1000+ microsecond spark duration - 60+° duration at 10,000 RPM! (CD based ignitions only have 3° of spark duration at 6,000 RPM)
  • Ignition timing is now load-dependant instead of rpm-dependant, making it much more flexible and safer for the engine. Your expensive engine will last longer because of less stress on internal engine components due to the TEC GT super-accurate ignition event.
  • For the boosted 928 - instead of the current system that has no Manifold Air Pressure inputs and a static fuel map; you will now have a dynamic fuel map that responds to boost and adjusts both the ignition timing and fuel injector phasing accordingly.
  • Comes with 4 user-definable outputs that the Tuner can use to control electric radiator or intercooler fans, waste gates, and other devices. RPM and MAP-activated set points allow you to control any other RPM activated item like shutting off the AC compressor automatically at a specific RPM or MAP value, or switching on an auxiliary fuel pump at a set RPM or MAP value.
  • Also has 4 user-definable inputs that the Tuner can use to process or log data from wheel speed sensors, add an ignition-advance trim, add an all-electronic instrument cluster, a NOS-retard, and other uses. Will support both high and low-impedance injectors, with their faster switching and better idle capabilities on cars with aggressive cams.
  • The capacity for 2-injectors per cylinder where needed, and smooth injector switching through the RPM range. It also provides staged injector settings, sequential injector settings (with a camshaft position sensor), and phased-sequential firing.
  • The system has automatic battery voltage compensation so that low battery voltages do not modify injector phasing.
  • The system has a deceleration fuel cut-off to stop backfiring during a rapid decel.
  • The system will upgrade your 928 from the on/off/on SPDT throttle position sensor we have now and bring us to the better potentiometer-style Throttle Position Sensor (TPS). This makes a new list of features available to you including TPS data logging; TPS-mapped fuel enrichment ; "Valet Mode" if you want t o restrict the engine output for your kid or wife or Valet; and it adds tuning capabilities that include blending the TPS position to the MAP sensor for an improved idle when the car is equipped with lumpy camshafts.
  • You can choose from 3 rev-limiters, or a sequentially more severe "soft limiter".
  • The knock sensor threshold can be adjusted, and what happens when a knock is found can be controlled and configured.
  • Full data logging capability built in.
  • No moving parts to wear out or replace Closed-loop, open-loop, and Auto-tune functions (of course).
  • CAN BUS support.
  • Proudly made in USA


  • TEC GT Electronic Control Unit
  • TEC GT 6' Main Wiring Harness
  • Two Direct Fire Ignition Units
  • Pre-wired TEC Power/Fuse/Relay Wiring Harness
  • MAP (Mass Air Pressure)
  • Sensor MAT (Mass Air Temp)
  • Sensor Bosch D-type TPS (Throttle Position Sensor)
  • PC Serial Communications Cable
  • TEC GT Software for Windows PC
  • Complete Electromotive Installation Instructions

Porsche® 928 1987-95 kit includes everything in the kit above plus:
    Adapter bracket to mount TPS to Porsche® Throttle Body
    MAF Sensor Adapter with MAT bung
    Complete Custom Spark Plug Wire Set
    928 Motorsports Porsche® 928-specific installation instructions

Porsche® 928 1985-86 32v kit includes everything in the 2 kits above plus:
    Adapter mount for knock Sensor
    Porsche® 928 Knock Sensor
    MAF Sensor Adapter with MAT bung
    Complete Custom Spark Plug Wire Set
    928 Motorsports Porsche® 928-specific installation instructions

Porsche® 928 1978-1985 16v kit includes everything in the 3 kits above plus:
    Crankshaft Reference Mark Sensor
    Crankshaft Sensor Mount
    Distributor Hole Plug

Items that you may need depending on the year of your car: flywheel with timing gear (we have those if you need them), throttle body and intake/inlet tubing and connectors.



Price (USD)



Electromotive TEC GT Engine Management System


Ships in 1 Week or Less

* Domestic US shipping shown. International shipping will be calculated based on location.


Phone: (920) 485-0928
Email: info@928motorsports.com

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Horicon, Wisconsin USA

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