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928S4 928GT 928GTS

The ProMAX Performance chips for the 928 S4, GT and GTS models have been extensively developed to provide not only a power increase, but also improved smoother running. All flat spots and anomalies have been engineered out of the original compromise chip (ECU EPROM). To ensure that emissions are not effected, changes beneath 3,000 rpm are minimal. The timing curve on these chips is substantially smoother than the original with the often pronounced step in the mid-range made more progressive. Power gains at the top end are between 5-14%. Power increases of up to 18% have been recorded on cars fitted with a modified induction system and free flowing exhaust (with cat bypass). NOTE: 2 chips are supplied for the 928 - LH (fuel injection) and EZK (ignition ECU). NOTE: Only available for 32 valve models (S4, GT, GTS).

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How can performance be so easily improved? Why didn't Porsche build this performance into the car to begin with? There are many reasons for this. Some cars are deliberately kept in a lower state of tune so as not to get too close to the performance of other models (i.e. marketing reasons). Other reasons included ensuring the car could use low octane fuel and survive a few missed services.

If you are prepared to use 98 octane fuel (not essential, but best to get the maximum performance) - you can enjoy the performance that your car is actually capable of. Power gains are anything from 10-25bhp (often more) with torque gains of 14-30lbft. NOTE: All power and torque gains are dependent on your car's current engine condition, modifications and induction system. Power gains can not be guaranteed.

IMPORTANT: Applicable to cars from 1983 model year onwards (928 S2 with Motronic ECU). NOTE: Please select your model type - see the table below.