I believe they are talking about downshifting to slow the car in place of using the brakes. Not leaving the car in gear when going down hill.

New Z owner and had the same question. I always coasted downhill with my automatic Civic and after 16 years no transmission problems (that I know of).

But my Z really slows down when off the gas, even downhill. The Z also has stickier tires. I'll try paddle shifting to a different (higher?) gear.

The 2015 owners manual P 5-13 says "Caution: Coasting with the transmission in the neutral position may cause serious damage to the transmission".

Number 1 absolutely. The car must be left running if you're going to coast in neutral in an automatic.

104

Yup....it'll save more gas but not money. You'll be replacing the tranny.

104

quite a bit of miss-information in here.....

coasting down a hill with the 7AT in neural will not save you any money as the engine will be idling and using gas. When coasting in gear, the rpms will be held by the transmission and the injector will not inject fuel.

best way to see this is with an wideband gauge or dataloging your O2 sensor when driving.

Well, just to clarify, if your engine is idling, the injectors are opening. They're just running a vastly smaller duty per cycle. So they're open for a shorter period of time. If the injectors remain closed, your motor isn't running.

As for the mission; there's still fluid flow. The pressure is mostly maintained by the ECU. The issue is the sudden gear engagement when you need to accelerate again.

It's like trying to clutch start a manual: dumping the clutch in gear while rolling is bad news. Same issue with an automatic. Engaging those "gears" (they're clutch packs, really) while moving is sudden force on those parts.

I advocate leaving the car in gear, using a combination of engine braking and the cars actual brakes. That should help minimize wear on either part.

I've coasted downhill in neutral in MT cars for over 20 years and never had any issues. I don't know where you guys get this theory from, but to each his own.

really ?

not sure if serious....

:wtf2:

let me subscribe off this thread, I thought it was about the 7AT...