The most misunderstood aspect of the Toyota hybrid synergy drive system

if not, do it again with an instrument that can show the engine RPM, fuel cut status, battery state of charge, and current. Use the cruise control as described in #38. Datalog this and/or capture it on video showing your preparation, your roll down the hill, and the absence of engine braking.

At this point, you are the one owing the forum evidence of your contrarian claim.

 

I also won't accept a negative result based on ear alone, without instrumentation. I have enough relatives with significant enough hearing impairments to know that not everyone can hear it.

I must note that your dispute with our statements is also anecdotal, without any proof or evidence. While many of us have seen documentary evidence posted here, going back long long before you (or even I) joined this forum. And experienced it first hand, both without and with instrumentation.

 

Given B mode is just a momentary switch contact to the hybrid system, it’s hard to comprehend how engine braking could be anything other than completely computer controlled.

Just had automatic engine braking in D happen today on a pair of steep mountain grades in Colorado. Never used B and frankly never do. The car quickly filled the battery using normal light brake controlled regen. The hybrid system automatically switched to no fuel engine braking and reved higher if I braked slightly harder.

I also tried cruise control and the system automatically maintained the set speed without operating the hybrid brakes. In both cases the unfueled engine reved abnormally high.

There are more interesting technical explanations on what actually happens to achieve engine braking but I would recommend gaining a thorough knowledge of the Toyota e-cvt system first. Spoiler alert, Brake mode is less efficient than D mode by design. I will say certain “deal” assumptions are wrong.

 

You're gonna feel it more than hear it in a 2024. Like I said in my post, if you go down a downhill, the car will detect this and increase regenerative braking as well as a bit of engine braking to slow your descent. It is more noticeable in SPORT but will also happen in the other ECT modes.

It should not be consider as automatically engaging "B" mode by the car. "B" mode can only be engaged physically with the shifter.