ProductsThe SimTek ECU range caters for the Subaru Impreza and Legacy, GC8 / GDB engine codes.
There are currently 4 models;  > E1S96 - Covers MY93-MY96 Series 1 / 2 - E1S97 - Covers MY97-MY98 Series 3 / 4
- E1S99 - Covers MY99-MY00 Series 5
- E1S02 - Covers MY01-MY06 ‘Newage’ Non Drive By Wire
The SimTek ECU range are only available ‘installed and mapped’
Tech Info · MAF Less System By using a speed/density based control strategy, the need for the Mass Air Flow meter, and the associated limitations and potential problems can be eliminated. The ECU can be configured to operate with either the OEM MAP sensor or any commercially available 0-5V sensor. · Real Time Live Mapping All SimTek ECUs have real time live mapping, providing your mapper with the information and ability to get the most from your engine. There is no need to stop the engine whilst changes are made, and there is no limit to the number of changes that can be made. Your mapper can see the effect of changes instantly. · Plug ‘n’ Play All the SimTek ECUs have no requirement for ‘adapter looms’ or wiring modifications, and fits into the OEM case, providing for a neat and reliable installation. This also allows for the vehicle to be easily returned to the OEM ECU should the vehicle be sold. · Advanced Wastegate Control The wastegate control system incorporates features commonly found on high end aftermarket boost controllers, thus eliminating the need for this additional expense. This includes engine speed and throttle angle 3D closed loop control, along with gear dependant corrections. · Multi-Maps ‘Multi-Maps’ enables you to effortlessly change between maps as your requirements demand. You can have a map setup for ‘normal driving’, which is optimised for fuel economy and then change to ‘track day’, which is optimised for performance. The choice of what your Multi-Maps do is down to you and your mapper. The Multi-Maps allow changes in Fuel, Ignition & Boost. They are ‘full maps’ not just a single modification, to a common base map. You can choose how you select your desired map, either using an add-on selector switch (allowing the maps to be changed ‘on the fly’ whilst driving) or by using the throttle pedal position at switch on. · Knock Warning The ECU uses the OEM Knock Sensor to listen for ‘Knock’. This is then fed to a Digital Signal Processor for analysis. If the DSP decides that knock is detected, the Check Engine Light will be flashed to give the driver warning that engine damage could be occurring. In an effort to avoid damage, you then have the option of switching to the alternate calibration (map) whilst the cause of the knock is identified. This is often down to a low quality tank of fuel. · Closed Loop Fuel Control The ECU uses the OEM narrowband lambda sensor to give optimal fuel control in the idle / light throttle / cruise regions. The ECU checks that the signals from the sensor are valid, and will switch to Open-Loop if it believes the sensor to have failed. As an option, it is possible to connect a true wideband sensor. · OEM Driveability The use of 24 x 24 fuel and ignition maps, gives unparalleled resolution and results in excellent road manners for light throttle driving. Advanced acceleration enrichment features give crisp throttle response even when using large injector configurations. Comprehensive starting strategies which are replicated from the OEM ECU, ensure ’first turn’ starting in all conditions. · Anti Lag System As a cost option, the ECU can have ALS installed. Three ALS calibrations are available, allowing for ‘Jacked Open Throttle’ based systems as well as driver selected Hard / Soft modes. Air charge temperature is monitored by the ALS system to reduce the risk of engine damage due to high charge temperatures. · Launch Control and Full Throttle Gear Change As part of the ALS cost option, the ECU has the ability to provide launch control and full throttle gear change (FTGC requires the use of a non-syncromesh gearbox to gain maximum benefit) · Gear Change Output (Shift Light) The ECU provides a ‘Shift Light’ output to indicate to the driver the optimum point to change gear. The point at which the output is activated is gear dependant. · Multi Stage Engine Speed Limiter The ECU has a progressive engine speed limiter using a combination of fuel & ignition cuts. This provides full over speed protection, whilst not giving a sudden loss of power. · Individual Cylinder Fuel & Ignition Trims The ECU allows for each cylinder to have it’s own fuel & ignition ‘trimmed’ to allow for small differences between cylinders. When combined with the Knock Sensor DSP, which can not only detect knock but can discriminate which cylinder is the cause. This permits the engine output to be balanced so that all cylinders are performing equally. · Automatic Water Spray / Injection Control On vehicles equipped with an intercooler water spray or aftermarket water injection system, the ECU can take control of this to provide closed loop charge temperature correction. Trigger levels are determined based on engine speed, throttle angle, boost pressure and air charge temperature.
FAQ These are some of the questions we get asked about the SimTek ECUs … Q:What are the main advantages of the SimTek over the OEM ECU? A:The Simtek uses a MAP sensor to control the engine’s fuelling and ignition rather than the MAF sensor used by the OEM ECU. The ability to eliminate the MAF gives more accurate fuel and ignition control at high boost which can give performance gains.Also,in the case of the MY99-00 cars, it improves reliability as these MAFs are notoriously fragile. Q:Will my car be difficult to start? I have heard tales of after market ECUs giving starting problems particularly when cold. A:The Simtek software has been designed to replicate the “strategy” of the OEM ECU in this area.With correct mapping, starting either cold or hot is not a problem.Some customers have remarked that the starting has improved over the stock ECU! Q:How will it drive off boost? A:The 24×24 fuel and ignition maps allow for very precise settings to ensure that the “driveability” is not compromised over the stock ECU.The acceleration enrichment strategies are also very comprehensive again ensuring the “flat spots” can be eliminated. Q:Can I transfer the SimTek if I sell my car? A:You keep your OEM ECU so you can put this back into your car (assuming any other mods allow this) if required.The SimTek uses the standard loom so re-installation of the OEM ECU is simple.The Simtek will transfer over to any Impreza or Legacy with the same plug layout. Q:Do I get a warranty? A:Yes! We guarantee the ECU against failure caused by manufacturing defects for 2 years. Q:Can the SimTek cope with really big power outputs? A:The SimTek will enable any engine to achieve its optimum performance.Simteks are now running anything from standard road cars with 300BHP up to heavily modified drag racers with 650+BHP. Q:What other features will I get? A:The SimTek has been designed with both road and competition use in mind.For safety of the engine it has the ability to detect “detonation” and warn the driver through the check engine light.It has 3 stages of rev limit all user configurable.It has twin maps for different fuel or boost requirements.For the serious competitor it has two stage Anti-lag and launch sytems.For the ultimate in engine mapping all four cylinders have individual fuelling and ignition trims.It uses an Air Charge Temperature sensor to automatically trim the ignition timing to further protect the engine from detonation caused by high charge temps.It also uses this sensor to control water spray or injection systems. Q:Can I still read the fault codes? A:The “Check Engine light” (CEL) has a double function with the SimTek as a detonation warning and shift light.To read the engine sensors to diagnose faults requires the use of a lap top with the Simtek software.Your Simtek Dealer can obviously access these readings,but the software is also available to the end-user as detailed in the Price List. Q:Will my car still pass the MOT? A:The SimTek still uses the stock lambda sensor to control idle and part throttle fuelling, so assuming no other modifications are preventing the correct emissions from being achieved, the car will still be able to pass.
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