BMW hasn't ruled out the idea.
Before anyone had the chance to drive it, the 2020 Toyota Supra took some flack for "only" producing 335 horsepower from a BMW-sourced 3.0-liter turbocharged inline-six. But as several dyno and track tests have now revealed, the Supra's output was underrated and the car is even quicker than advertised.
Major outlets have tested the Supra at just 3.8 seconds to 60 mph, but there will undoubtedly be people out there hoping Toyota builds a faster version. The B58 BMW engine powering the Supra could easily be tuned to deliver more power, but in a recent interview with Autocar, BMW M division president Markus Flasch proposed an alternative solution for a more powerful Supra.
BMW builds a more powerful inline-six called the S58, which debuted under the hood of the X3 M an X4 M producing 473 hp or 503 hp in Competition guise. This twin-turbocharged inline-six will also be employed for use in the next-generation M3 and M4 and possibly the rumored M2 CS. But what if it also found its way into the Supra?
"We’ve certainly made no offer to supply the engine to Toyota - and no request has been made, as far as I know. But it’s an interesting idea, if unlikely for now. It would be a lot for us to give away, you might say. But I’d never say never,” Flasch said. If Toyota did buy the S58 for use in the Supra, it would be the first time an outside manufacturer was granted access to an M engine since the McLaren F1's S70 V12.
"As a rule, we don’t offer BMW M engines to third parties because we consider them such a strength of our cars,” Flasch explained. "I think it would be a hard decision for a lot of the team to accept particularly with the S58 being so new. Why would we sell it before we had a chance to use it ourselves in all the places we plan to?" It seems unlikely for now but BMW hasn't out the idea. Flasch did say, "never say never," after all. Perhaps if Toyota sees enough demand, it will make an agreement with BMW to supply the engine.