I had been gradually building up the top speed, looking at the data and fine-tuning the engine settings.

Street had always built his own frames and tuned his engines.

He reportedly took extra time tuning the engine so that it would sound like the full-scale model.

When tuning an engine for higher performance, different pistons and higher lift camshafts are often installed.

Teams are not allowed to tune their engines, but can adjust suspension, brakes etc.