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Understanding the Toyota RAV4 Hybrid

WeberAuto · 1.7M views · 2021-01-23 · 39:08

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Overview

Weber State's Professor Kelly explains the Toyota RAV4 Hybrid transaxle, including its planetary gearset eCVT and all nine operating modes. It also covers how the engine reaches nearly 40 percent thermal efficiency.

On Hacker News

HN points to it as the clearest hands-on explanation of how Toyota hybrids work.

Recommended by 3 HN people across 3 months · HN mentions 2023–2026

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What people said

globular-toast · 2026-05 · Strong recommendation

I understood after I watched the brilliant Weber Auto video on it, published 5 years ago[0]. I liked it so much I "gently" encouraged my partner to get a Yaris hybrid, which gets about 69mpg average. It's not unusual to see 80+ on individual trips. She was a little sceptical about having an auto at first, because us Europeans still think it's 1980 and that manuals are superior, but she came around after a few minutes of driving. To be fair, though, classic "slushbox" autos actually were/are garbage, as are chain actuated CVTs. The hybrid system gets you immediate acceleration like an electric, none of this awful lag you get with a slushbox. It's hilarious to me that 34mpg is considered remarkably good, though. I know it's a "minivan" but my Golf GTI gets 42mpg and is actually fun and arguably cool. I can also fit 5 people, furniture, and 2.4m lengths of timber in it comfortably. [0] [VIDEO]

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hedgehog · 2025-12 · Recommendation

The planetary gear "eCVT" systems that Toyota and Ford use in many models are mechanically a lot simpler than a traditional automatic or sequential manual transmission. Few moving parts and no clutches at all. I don't know what the long term reliability of those drivetrains is is but I wouldn't be surprised if it's measurably measurably better than a traditional transmission + engine. There's a long educational video from Weber State University that gives a good walkthrough of what's going on in those things. [VIDEO]

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somerandomqaguy · 2023-07 · Recommendation

Toyota's eCVT? Not at all. The gas engine can drive the front wheels directly. [LINK] Conceptual explanation of the system. [VIDEO] Weber Auto giving an extensive hands on explanation.

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Sources

Video by WeberAuto, played through YouTube.

Data and selection notes

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