EFI Conversion Electrical Support
Converting a classic car from carburetor to electronic fuel injection means re-engineering the entire sensor and wiring layer. We handle the electrical complexity — ECU integration, sensor wiring, harness adaptation, and CAN bus signal routing — so the engine runs right the first time.
The Real Challenge
Why EFI Conversions Fail
The engine is the easy part. The wiring is where most conversions stall.
A carburetor needs fuel and ignition. EFI adds MAP, MAF, IAT, CTS, TPS, O2, crank position, cam position — each needing its own wiring run, ground reference, and signal conditioning.
A bad ECU ground causes misfires, sensor noise, and erratic idle. Old classic car chassis grounds were never designed for the precision that modern ECUs demand.
The ECU needs a clean crank position signal. Installing a trigger wheel and crank sensor on an engine that never had one requires precision alignment and proper shielded wiring.
Most EFI swaps change how cooling fans are controlled. The original thermostatic switch may be gone. The ECU may not have relay outputs. This is exactly the problem our Fan Controller Module was built to solve.
What We Do
EFI Conversion Services
We help select the right ECU for your swap — standalone aftermarket units (Haltech, AEM, MegaSquirt), factory PCMs from donor vehicles, or OEM replacement units. We handle pinout mapping and base calibration guidance.
We build sensor harnesses to spec — correct wire gauges, proper shielding on sensitive signals, factory-style connector terminals, and clean routing that won't chafe or catch heat.
Modern ECUs broadcast data on CAN bus. We route that data to digital dashboards, data loggers, or our custom instrument cluster — giving you live engine data in a classic-looking build.
When the thermostatic switch is gone and the ECU can't drive fans directly, our Fan Controller Module takes over. Reads temp from sensor or CAN, drives relays, fails safe. Already tested in a real engine swap.
See the prototype →We rebuild the ground network for EFI — star topology from battery, dedicated ECU chassis ground, sensor signal grounds separated from power grounds. Eliminates noise-induced misfires and sensor drift.
When the EFI conversion is installed but not running right — we diagnose it. Scope-trace sensor signals, verify timing, read ECU fault codes, and isolate the wiring issue causing misfires or poor idle.
Common Platforms
Swaps We've Worked On
LS1/LS3 into classic Chevrolets, muscle cars, and trucks. Gen III/IV wiring adaptation.
SBC/BBC with aftermarket EFI throttle body or multi-port injection kits (Holley Sniper, FiTech).
Custom engine builds using Haltech, AEM, MegaSquirt or similar standalone management systems.
RB, SR, 1JZ/2JZ, and similar imports. CAN bus and sensor integration in UAE market vehicles.
Process
How We Work
- 1Review Your Build
We review the donor engine, target vehicle, and chosen ECU. Identify what's missing — trigger wheel, sensors, harness connectors, relay outputs, ground paths.
- 2Design the Wiring Plan
Document every sensor, its signal type, wire gauge, shielding requirement, and connector. Map ECU pin-to-sensor assignments. Plan the ground network topology.
- 3Build & Install
Build harnesses to spec, install modules (fan controller, sensor hub), run wires with proper protection and routing. In UAE: on-site installation available.
- 4Commission & Verify
Verify each sensor signal on a scope, check ECU fault codes, confirm fan control behavior, and document the final configuration for future reference.
Planning an EFI Conversion?
Tell us the engine, the car, and where you're stuck. We'll tell you what the electrical work involves and whether we can help — no obligation.