Dr Jiulin Teng
Welcome! I am Dr Jiulin Teng. Over the years, I have developed insights into a number of issues of popular interest. A photography enthusiast, I have also captured photos of places and people that tell stories. This website is dedicated to my thoughts and my photos.
Mercedes 725.0 9G-Tronic, aka NAG3, is one of the most advanced automatic transmissions for passenger vehicles today. Let us analyze the advantages and trade-offs of the 9G-Tronic and delve into how its gear train works.
These photos were taken in December 2025 in various parks in Zhongshan.
The ZF 8HP represents both a major evolution in the philosophy of the 6HP and a considerable revolution in gear train design. Today, let us analyze its advantages and trade-offs and delve into how its gear train works.
The ZF 6HP can be considered the world’s first modern automatic transmission, influencing all future models with a series of conscious trade-offs. Today, I analyze the advantages and trade-offs of the ZF 6HP and delve into how its gear train works.
The Mercedes 722.9 7G-Tronic was the world’s first 7-speed automatic transmission for passenger cars. Today, let us analyze the advantages and trade-offs of its design and delve into how its gear train works.
The Toyota–Aisin AA80E remains the most robust and reliable 8- and higher-speed transmission. Today, I analyze the advantages and trade-offs of its design and delve into how its gear train works.
In this article, I comment on the seven best-looking Chinese EVs on the market.
In no small part thanks to how controlled TCC slip is managed, modern automatic transmissions can have noticeably different drive feel and reliability.
There is a lot of confusion and certain amount of misinformation on the mechanics of AWD systems. Today, I cover the six types of AWD mechanisms found in passenger vehicles.
I discuss the five passenger cars currently on the market with the best designs to me.
These photos were taken in Ganzhou in mid-November 2025 during a brief stop.