Join Date: Sep 2015
Location: Milwaukee, WI, USA
Mentioned: 2 Post(s)
Tagged: 0 Thread(s)
Quoted: 76 Post(s)
Yeah, turbocharging a SkyActive engine has been done before as evidenced by Mazda's own 2.5L engines in the CX-4 and CX-9, but it's not as simple as just slapping on a turbo and tuning some software if you want to do it reliably. Mazda has done some tricks to get their "dynamic pressure" turbo 2.5L from eating its own guts. Notably, Mazda says their turbo 2.5L SkyActiv engine has a compression ratio of only 10.5:1 where the naturally aspirated version is at 13:1 compression ratio.
Software alone can't fix added stress on rotating parts that likely weren't designed for those added stresses forced induction will create. I would imagine that any boost pressure added on this engine with a regular off-the-shelf turbo kit would need to be so limited, that I can't see it being worth the expense.
Mazda's next-gen SkyActive 2 engines are reported to be running similarly to a Diesel engine, intentionally using auto-ignition for its combustion cycle, and they say they won't need spark plugs at all. Those engines will be pushing total compression ratio up to around 18:1, which again is very diesel-like.
His: 2018 Mazda6 Grand Touring, Machine Grey Metallic
Hers: 2016 CX-5 Sport, FWD, Reflex Blue