The Nissan VK56 has quickly become one of the hottest engine swap platforms around, and until now there hasn't been a true plug-and-play ECU and wiring solution built specifically for it.

That's where we come in.

This package combines a Haltech Nexus S3 ECU with a Mad Scientist Auto custom-built engine harness, giving you a professional, reliable engine management solution that's built specifically for your swap.

Our wiring quality has been proven on everything from my own record-setting VK56-powered S2000 to hundreds of customer builds, including K-Series, B-Series, LS, and countless other engine swaps. Every harness is designed, built, and tested in-house using premium components, including Raychem DR-25 heat shrink, to deliver the durability and reliability expected from a motorsports-grade harness.

No two swaps are exactly alike, which is why every harness is built to your specifications. After placing your order, we'll work directly with you through email or social media to configure your harness for your exact combination.

Choose the cam and crank sensor setup that fits your build using the dropdown options. We also offer discounted pricing on our VK56 ATI Damper & Trigger Kit when paired with Cherry Hall sensors for customers looking for the ultimate timing signal accuracy.

Just as important as the parts themselves is the support behind them. When you purchase from Mad Scientist Auto, you're not left to figure it out on your own. We stand behind every harness we build and are always available to help our customers throughout their project.

Base Package Includes

Haltech Nexus S3 ECU
Haltech Wideband Kit
Mad Scientist Auto custom engine harness built specifically for your application
Raychem DR-25 protected harness
Harness configured for either OEM Nissan sensors or Cherry Hall sensor setups

Whether you're building a drag car, street car, drift car, or off-road project, this package delivers a clean, dependable engine management solution designed to get your VK56 running quickly—and running right.

Collection: vk engine management

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Haltech Nexus S3 Plug & Play ECU & Custom MSA Harness Package for the Nissan VK56