Infiniti’s New VC-T Engine - Infiniti QX50 Forum
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post #1 of 8 Old 08-15-2016, 03:24 PM Thread Starter
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Infiniti’s New VC-T Engine



We may have thought that Infiniti’s new 3.0-liter twin-turbo V6 engine, codenamed VR30, was the most powerful and fuel efficient production engine that the manufacturer had to offer but their recent announcement has revealed another trick up their sleeves.

Set to be presented at the 2016 Paris Motor next month on the 29th, Infiniti will show off the first ever production-ready variable compression ratio engine. Shortened to VC-T (Variable Compression-Turbocharged), this will be one of the world’s most advanced internal combustion engines ever created.

This engine has been in development for more than 20 years and Roland Krueger, president of INFINITI Motor Company, claims the new four-cylinder turbocharged gasoline VC-T engine is going to be a “revolutionary next-step in optimizing the efficiency of the internal combustion engine."
What makes this technology so special is the engine’s ability to deliver the same power as a high-performance 2.0-liter turbo gas engine but at higher level of efficiency. It can automatically and seamlessly adjust the height the pistons’ reach which in turn changes the compression ratio when needed.
The engine displacement can drastically change, anywhere from a high performance 8:1 compression ratio to a fuel sipping 14:1 is possible. By doing so, the VC-T motor can optimize the compression ratio to tackle the task at hand, something that engines with a fixed compression ratio cannot do.



Besides reducing fuel consumption and emissions, the new VC-T technology will also decrease noise and improve vibration levels, help the engine shed a few pounds and make it more compact. According to Reuters, when it’s compared to a conventional 3.5-liter V-6 engine, the 2.0-liter VC-T engine was found to be around 27% more efficient.

Even though Infiniti isn’t the first one to develop a variable-compression engine, the company may be the first one to bring it to production. We’ll just have to wait for their press conference on the 29th at 12:30 p.m. local time to have an idea of which model they plan to debut this technology in.
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post #2 of 8 Old 09-02-2016, 06:11 PM
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I'll stay away from it for a while, don't know what to expect with it and rather not be on the receiving end of potential issues. After a year on the market then I might give it a look.



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post #3 of 8 Old 09-24-2016, 08:04 PM
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I am avoid turbos, that is why I ended up with a QX50 and not a Lexus NX or Mecedes GLC or Audi Q5. My other choice was Acura's RDX with a naturally aspirated V-6.
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post #4 of 8 Old 07-09-2018, 05:11 PM
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I could not stand the thought of a FWD or AWD 4-banger crossover. All I wanted was 6 or more cylinders and RWD, which limited the market considerably. It came down to the 2017 QX50 or QX70 for us. The QX70 was just too beg for our needs, as was the BMW X5. I love the 3.7 V6. Great car. I'm leery of the new engine and the CVT.


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post #5 of 8 Old 07-10-2018, 10:41 PM
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We love the new engine. Lots of power and plenty of torque. Excellent gas milage.
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post #6 of 8 Old 08-15-2018, 05:06 AM
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2000 miles on our 2019 QX50 and I really like it. Very smooth, plenty of power, and getting ~26 mpg around town.
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post #7 of 8 Old 08-15-2018, 05:59 PM
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So I must not be driving mine right. My gas mileage is 19 mpg which is worse than my 2015 q40. What might I be doing wrong?
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post #8 of 8 Old 08-16-2018, 05:21 AM
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Tonya --

My 26mpg, around town = driving in "Standard mode", no hard acceleration, just easy driving.
I also reset the avg mpg gage with each fill up. Not that this changes the MPG, but it updates the MPG more quickly.
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