Why did Toyota secretly design an engine to outperform Ferrari and never sell it? In the 1990s, Toyota built the 1LR-GUE V10 engine for the Lexus LFA, an ultra-rare supercar that took over a decade to develop. The engine revved from idle to 9,000 RPM in just.6 seconds, so fast that analog gauges couldn't keep up. They had to use a digital tachometer. The sound was tuned with Yamaha's music division, resulting in one of the best exhaust notes ever. But here's the crazy part. Toyota lost money on