Direct Injection

Technical Library › Functions and TuningUpdated Sep 2026

Direct injection comes up a lot as more modern engines get swapped and tuned. Here's where Haltech stood on DI control when this article was written, and how we help customers plan around it.

Direct injection (DI) sprays fuel straight into the combustion chamber at very high pressure, instead of into the intake port. That needs a high-pressure mechanical pump, special high-voltage injector drivers and very precise timing of each injection event. It's a different job from running port injectors.

When Haltech wrote its original note on this topic, it didn't offer a product that could control direct injection, and said DI was something it hoped to add in future. Product lines change, so check the Haltech range or ask us for the current situation before you plan a build around it.

Options for a DI engine

  • Convert to port injection. A common path on swapped engines: add a port-injected intake and run it on a Haltech.
  • Keep the factory ECU for fueling. On some builds the factory computer stays in place and other parts of the system are handled separately.

Every engine is different. Book a free consultation and we'll talk through what makes sense for yours.