I'm planning a hybrid conversion on a classic Hemi-powered car and need a solid methodological framework. Specifically, I want to understand the most reliable ways to size the electric motor, integrate the control electronics, and manage the power split between the combustion engine and the electric drive during varying load conditions. What are the key parameters to monitor, and which tuning strategies have proven effective in preserving engine reliability while maximizing torque delivery? Any recommended testing procedures or diagnostic tools would be helpful. How do you usually approach the calibration phase in such projects?
Best practices for integrating electric torque with a classic Hemi build
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Exactly—when I did a Hemi hybrid swap I started by matching the motor’s peak torque to about 30‑40 % of the engine’s max so the drivetrain stayed balanced, then used a CAN‑based controller that lets you monitor RPM, throttle position, battery SOC and inlet temps in real‑time. I tuned the split by running a chassis dyno and tweaking the torque‑bias map until the engine stayed under its torque limit during hard launches, while the electric assist filled in the low‑end gap. For calibration I relied on a combination of a data‑logger (e.g. NI‑LabVIEW) and OBD‑II diagnostics to verify torque requests, voltage sag and temperature spikes before final road testing.