Who the Elite 550 is for
We recommend the Elite 550 for four-cylinder engines and simpler builds that need solid fuel and spark control without a lot of extra outputs. It's also a common choice for piggyback installs where the factory ECU keeps running the rest of the car. Nothing is locked behind extra fees; every ESP feature is enabled out of the box.
Inputs and outputs
| Channel | Qty | Notes |
|---|---|---|
| Fuel injector outputs | 4 | Peak and hold, 0-8A peak / 0-2A hold |
| Ignition outputs | 4 | Distributor, multi-coil or Haltech multiplex CDI |
| Engine position inputs | 2 | Broad trigger pattern support |
| Digital pulsed input | 1 | Digital signals only |
| Digital pulsed outputs | 5 | For fans, pumps, solenoids, lights |
| Analog voltage inputs | 2 | Spare sensors or switches |
| Dedicated sensor inputs | 3 | Throttle position, coolant temperature, air temperature |
| Internal MAP sensor | 1 | 3 bar, good for up to 29 psi (200 kPa) of boost |
| CAN bus | 1 | For Haltech CAN expansion devices |
Two analog inputs and one digital input is where the 550 gets tight. CAN-based devices such as Haltech wideband controllers help, because they don't use up those pins.
Features
- Sealed case rated IP67, but only with the waterproof USB cable or waterproof USB cap fitted. Both are sold separately.
- Single 34-position AMP connector
- Sequential, semi-sequential, batch or multipoint injection
- Load from throttle position, MAP or MAF
- Closed loop O2 control and user-definable tables
- Tuned with ESP software
Specifications
| Spec | Value |
|---|---|
| Supply voltage | 8 to 16 VDC |
| 5V sensor supply | 100 mA maximum |
| Dimensions | 5.0 x 5.0 x 1.54 in (127 x 127 x 39 mm) |
| Weight | 0.77 lb (350 g) |
100 mA is plenty for the usual TPS, MAP and pressure sensors, but it's shared. If you're adding several powered sensors, add up their draw before you wire them all to the ECU's 5V.
Buying and wiring
You can get the ECU alone, with a plug and pin set for a custom loom, or with a basic universal wire-in harness. Wiring details are in the basic harness diagram, the premium harness diagram and the complete pinout. Need more outputs? Compare the Elite 750.
