EHS tuners have 6 modes of adjustment, they're 3 zones for tuning fuel quantity, and 3 zones for fuel timing (when quantity zones turn on or off). These zones are initially configured in the base mapping. You have limited adjustment room to make necessary changes to your modifications. All our controllers are set up out of the box for the big 3 packages. The preset map generally leaves enough adjustment to tune for minor engine improvements. EHS designs and develops each base map in house for maximum gains in a budget friendly controller.
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