Mazda's Secret To Efficient Turbo Engines

How Mazda Makes Turbocharged Engines Efficient In The Real World

Mazda's 2.5L turbocharged inline four-cylinder engine won a Ward's Auto 10 Best Engines award in 2017 for the CX-9. The engine is now also used in the 2018 Mazda 6. The engine produces 227 horsepower on regular gas, and 310 lb-ft of torque. It has a unique approach for downsized turbo engines, which generally result in good fuel economy at low loads, but fail to provide efficiency when the driver demands more power.

Several of the clever technologies within this engine include a 4-3-1 exhaust that maximizes exhaust scavenging for turbocharged engines, while also providing two separate airflow paths to keep the turbo spooled at both low and high RPM. The engine also has cooled EGR to increase the load at which a stoichiometric air fuel ratio can be used. Check out the video for full details about how this engine provides loads of torque, but still offers good fuel economy.

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[RalstigRacing]

This is why, to me, Mazda is the most exciting car manufacturer right now. They are really letting their engineers have fun and design fundamentally good engines.

[metalbyku]

Mazda is most underrated car manufacturer. Always been. Mazda's game is very strong now. Both engeenering and design

[aaronhowell]

Mazda’s reason for including EGR really makes me like them so much more. EPA doesn’t change, but they want for the customer to get real results. So good.

[spamcan]

I love Mazda, they're the little company that could. My next car will be a Mazda.

[waydigga]

Mazda is truly a champion of the ppl. I feel like ppl that buy these types of cars may not care as much about fuel economy, but its nice that Mazda is delivering real world numbers instead of lab numbers.

[strangeclouds]

EE's Sunday morning uploads are just like Saturday cartoons as a kid.

[TheZProtocol]

Mazda is a very underrated automaker. They really stand out from the rest in styling and engineering!

[dwoodcob]

Mazda have been saying recently that they have found a way to double the efficiency of the 13b Renesis (RX8) Rotary engine. Many have been wondering how, including me for a while. Part of the problem with the Rotary is how hot the combustion chamber gets in these power plants. Mazda have leaned on using very rich fuel mixtures to address this in the past. Watching this has made me think, maybe they plan implementing some style of cooled EGR system for a Rotary? @EngineeringExplained what is your take on that’s?

[AHMEDMOOSAJI]

This is commitment
You just got married and still posting
Hats off

[coscorrodrift]

Damn, very interesting conclusion at the end, i think it's the right decision, props to Mazda for that. They may get less mainstream attention but for people who care like the people watching this channel it's surely good publicity to do that instead of going the cheating emissions route lmao

[Tiggzne]

Thank you for this video. I'm currently looking to upgrade my Mazda 3 GT to a 6GTR, but growing up I heard 4cyl turbos were bad news. Now I'm actually impressed and excited that I get to be a part of such an advanced and intelligent brand.🖖🏾👍🏾

[ben]

Faszinating technique. I really Like mazdas Philosophy to Focus on the needs of the customer

[matt_b...]

How do you start your Sunday? "Hello everyone, and welcome!"

Thanks for another great video this week.

[mikeculp]

I have a CX9 with this engine and I have to say it's pretty impressive. I do actually get the fule economy that they advertise and I'm happy with the power. Under normal circumstances I get about 26-27 mpg (in a 7 passenger suv)

[pvflyer]

My wife just bought a CX9 signature and all I can say is it doesn't feel like a 4cyl feels more like a 6cyl. So much torque, however you have to run higher octane 92 in order to achieve higher HP's. thanks for all those great videos

[TheParot]

I bought a Mazda six 2018 model recently. Love it. Great handling, great acceleration, the cooled seats are great. They had just offered Apple CarPlay as a paid for retrofit which I’m getting installed soon. Wouldn’t know what Else I could need in a four-door sedan.

[InexplicableBill]

Jason, I'm glad I discovered this video! I just replaced the spark plugs on my wife's 2019 CX-5 2.5 Turbo... and was wondering what that little device was mounted to the top of the engine. Cooled EGR - Neat! Now I'm going to research if it needs servicing. Back in the day, her 1995 Honda Accord EX wagon had a known EGR issue where carbon deposits would build up in the internal ports and cause drivability issues. I used to tear it down every year and clean the waxy carbon gunk out, and it would run great for a while after that. This Mazda one though, I look forward to understanding it more.

[gooniac]

Great explanation! I got the new Mazda6 and am amazed at the torque! I am still getting used to it but the fuel economy and performance is much better than my Mazdaspeed6! The Speed may have had better top end power but overall this engine is so much better! I am averaging 2.5mpg better with this one! Mazda got it right! Now to just get an AWD system....

[scenicroutetravelers]

I click on EE and see this crazy white board full of different colors and think I will never figure it out. By the time your done with your presentation, I completely understand it all. Im not quite sure how you do it, but please never stop! Thank you very much for all of your time and efforts sir!

[bobbyross]

This is why I'm such a big Mazda fanboy!