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The stock fuel system on the 3rd generation RX-7, with an appropriate ECU upgrade, can support upwards of 380HP* on the stock motor. The first component in the system to need replacing is the stock fuel pump. We offer an upgraded stock replacement pump which is an easy bolt in and can support over 500HP*.
Your next limitation in the fuel system comes from the injectors themselves. The stock fuel system uses two 550cc injectors for primaries and two 850cc injectors for secondaries which come on at higher RPMs. Those injectors, maxed to their extreme limit (100%), will support approximately 420HP* at stock fuel pressures. You don't want to push the injectors beyond 80%-85% duty cycle though for reliability reasons. To support more power on street driven cars, we recommend using additional injectors.
For those serious about RX-7 performance, looking for more power and more precise tuning we also offer alone ECU systems such as Microtech, AEM and the Power FC. Stand alone ECUs are only recommended for the more advanced tuners, those with experience, with access to a dyno and a wide band air-fuel meter
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