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This is what a 1,200-hp twin-turbo 4-rotor looks like in a Miata

We've seen the diminutive Mazda MX-5 Miata swallow plenty of big engines, but New Zealand drifting ace "Mad Mike" Whiddett is roaring into where-no-man-has-gone-before territory. Wanting to replace his 515-horsepower "MADBUL" RX-7 and its twin-turbocharged, three-rotor 20B engine, his new ride is an NC-series Miata with four rotors and twin Garrett turbochargers courtesy of Pulse Performance Race Engineering. It is called "RADBUL," and expected power at standard boost is 1,200 hp, but the builders at Pulse Performance think it will get up to 1,500 hp at full boost. And yes, that exhaust exits through the hood. Four-rotor engines are actually popular - builds are detailed on forums like this one from 2007 and this one from 2008, this UK company or this Canadian company will sell you one complete - but they're usually being prepped for an RX-7. Mad Mike's choice of a Miata for this enterprise makes this about as extreme as you can get, short of throwing it into a Mazda R360. You can watch Mad Mike tell the story of the build in the video, and check out the first and second installments about the build on the Red Bull site.

Mazda working on lithium-ion batteries to replace lead-acid starter batteries

In the quest for ever better fuel economy, car companies are looking for every single advantage possible, no matter how small. This is evident in everything from active grille shutters to the 48-volt mild-hybrid electric assist systems like that in the new Ram 1500. For Mazda, the latest target for potential efficiency gains is the lowly 12-volt starter battery. The company announced that it is partnering with two other companies, ELIIY Power and Ube Industries, to develop a lithium-ion starter battery that would be used on mainstream models in place of conventional lead-acid units. Mazda plans to have them ready for use by 2021. The advantage here would be that 12-volt lithium-ion batteries would be much smaller and lighter than the lead-acid ones they replace. And lighter cars don't need as much fuel to move around. Plus, as an added benefit, making cars lighter also often makes them faster and better handling. This is why companies such as Lotus and Porsche have offered optional lithium-ion 12-volt batteries for some lightweight sports cars. A potential downside to the use of these batteries is increased cost. Lead-acid batteries from your local parts store will run you between $100 to $150. AGM batteries could be between $200 and $300. As for lithium-ion batteries, Lotus introduced the option on the Evora 400 in 2016, and the option cost $1,690. Odds are that a company such as Mazda won't be absorbing all those costs, meaning that the cost of these future Mazdas could increase with a change from lead-acid to lithium ion. Related Video:

Miata buyers prefer a manual gearbox, says Mazda

Earlier, we wrote about Toyota's underwhelming 2018 manual transmission sales figures. To recap – as Toyota's representatives told CarBuzz – the automatic Corolla outsold its manual equivalent to a ratio of 100 to 1, and just one in three Toyota 86 buyers picked a manual version of the rear-drive coupe. What about the other famous rear-wheel-drive offering from Japan, Mazda's MX-5 Miata? A case can be made that an 86 buyer cross-shops the Miata, and vice-versa, but what kind of split do Mazda's sales figures reflect in comparison? We reached out to Mazda for some sales data, and PR program manager Tim Olson told us 76 percent of Miata soft-top buyers go for the classic stick-shift option, leaving just 24 percent of buyers preferring the automatic. Both transmission options for the Miata are six-speed. The figures are based on year-to-date sales data for the 181-hp 2019 Miata, from July 2018 through April 2019. Interestingly, the more coupe or targa-like, retractable hardtop RF variant takes a step towards the 86 when it comes to transmission choices. While RF buyers still preferred the manual, the split was far closer to half and half: 52% went for the manual, and 48% chose the automatic. Perhaps this reflects the RF's more grand tourer-like image, and it might also be indicative of the RF's higher pricing. If you're going to spend nearly $34,000 for a Miata, another $600 for an autobox doesn't necessarily mean that much – choosing the auto on the base, Sport trim level soft top roadster is a $1,350 bump instead. While the $26,650 base Sport isn't exactly spartan, on a roadster it's fine to have less cushiness. With the higher-specced Club trim level, the auto's price tag shrinks to the aforementioned $600, as it is on the RF Club. There's no base Sport for the RF, as the cheapest RF is the $33,865 Club. But still, the manual shifter's snick-snack feel is one of the Miata's classic traits that has been with it since its inception 30 years ago. Sources say fewer than 5% of the original first generation Miatas were made with an automatic gearbox, but it's obvious trends and tastes are changing – although to be fair, automatics are getting much better as well.