It’s a pure “cool factor” tuning party trick, but it also teaches you how VVT affects cylinder filling at low RPM — knowledge that directly translates to building better part-throttle response and midrange torque maps later.
Save your stock idle cam map first. Then, on a dyno or quiet street, increase exhaust cam retard by 5° increments at 800–1000 RPM / 0% load. Log misfire counts. The moment you see misfire spikes or MAP drops below 35 kPa — back off 2°. That’s your ghost cam limit. Eurodyne Maestro Tuning Guide
Want me to expand this into a full guide section with actual map axis examples and safety warnings? It’s a pure “cool factor” tuning party trick,