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I drive a honda accord (automatic), and a friend of mine advised me that
when I am driving downhill, I should shift the gear to 3rd gear from D. If I do it everyday, 5-6 times daily, will it lower the performance of the car (gearbox) ? Or am I simply doing the right thing as anyone should be doing? Philip |
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Philip Tang wrote:
> I drive a honda accord (automatic), and a friend of mine advised me that > when I am driving downhill, I should shift the gear to 3rd gear from D. If > I do it everyday, 5-6 times daily, will it lower the performance of the car > (gearbox) ? Or am I simply doing the right thing as anyone should be doing? > > Philip > > > if it's a steep hill that would have you shifting to 3rd on a standard transmission, go ahead and do it. in fact, hondas downshift for you on hard braking. it doesn't have any detrimental effect on the transmission. |
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Philip Tang wrote: > I drive a honda accord (automatic), and a friend of mine advised me that > when I am driving downhill, I should shift the gear to 3rd gear from D. If > I do it everyday, 5-6 times daily, will it lower the performance of the car > (gearbox) ? Or am I simply doing the right thing as anyone should be doing? > > Philip *Myself*, I would leave it in drive unless the hill is super steep, and you need the extra engine braking to help keep from burning up the brakes. On just everyday hills, I would leave it in drive. The tranny will know if it needs to downshift. You really don't have to do it yourself. Ditto for going uphill. It will downshift automatically if it needs to, to keep from lugging the engine. On most smaller to medium grades at highway speeds, I would prefer to stay in OD unless it starts lugging. Saves gas. If you drive down a hill in OD, and switch to 3rd gear, all you are doing is burning extra gas and adding a slight amount more engine wear due to higher rpms. Unless you *really* need the engine braking , I don't see the point of going to a lower gear. I'd rather stay in OD if above 35-40 mph. MK |
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Philip Tang wrote:
> I drive a honda accord (automatic), and a friend of mine advised me that > when I am driving downhill, I should shift the gear to 3rd gear from D. If > I do it everyday, 5-6 times daily, will it lower the performance of the car > (gearbox) ? Or am I simply doing the right thing as anyone should be doing? > > Philip > > > I have never understood the recommendation to use engine/transmission braking instead of the regular brakes to slow a car down. I would much rather change brake pads than I would repair internal clutch packs in an automatic transmission. For that matter, I would rather do brake work than I would replace conventional clutches on manual transmission cars, especially for front wheel drive vehicles. Unless there is a reason why the brakes are not up to the job, I use them to do all of my slowing down. The only time I might manually down shift and automatic is when traveling on roads which constantly change from uphill to downhill and thus cause a lot of extra shifting of the transmission. John |
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John Horner wrote:
> Philip Tang wrote: >> I drive a honda accord (automatic), and a friend of mine advised me that >> when I am driving downhill, I should shift the gear to 3rd gear from >> D. If >> I do it everyday, 5-6 times daily, will it lower the performance of >> the car >> (gearbox) ? Or am I simply doing the right thing as anyone should be >> doing? >> >> Philip >> >> >> > > I have never understood the recommendation to use engine/transmission > braking instead of the regular brakes to slow a car down. I would much > rather change brake pads than I would repair internal clutch packs in an > automatic transmission. using the engine is "free" braking. using the brakes is not. once the pads get hot, efficiency decreases, and in extreme cases, fade to almost nothing. needless to say, you don't want that. [ask any truck driver that's used the emergency run-off ramps on grapevine in southern california - i drive through once or twice a month, and every time there's a truck either in, just towed off, or the evidence of a fresh brake failure on those ramps.] engine braking does not consume clutch packs in the automatic any more than any other shifting. in fact, it's less wearing than a full power acceleration shift. > For that matter, I would rather do brake work > than I would replace conventional clutches on manual transmission cars, > especially for front wheel drive vehicles. see above. > > Unless there is a reason why the brakes are not up to the job, I use > them to do all of my slowing down. for a lightweight vehicle in ordinary use, you can get away with this just fine. for a heavy vehicle, or a vehicle in heavy use, it's a highly dangerous habit to be in. use engine braking and keep your brakes cool for when you may really need them. > > The only time I might manually down shift and automatic is when > traveling on roads which constantly change from uphill to downhill and > thus cause a lot of extra shifting of the transmission. > > John > |
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>
> > Unless there is a reason why the brakes are not up to the job, I use > > them to do all of my slowing down.for a lightweight vehicle in ordinary use, you can get away with this > just fine. for a heavy vehicle, or a vehicle in heavy use, it's a > highly dangerous habit to be in. use engine braking and keep your > brakes cool for when you may really need them. > > If engine braking is a good thing to do, then why do I see roadside message saying "Please avoid use of engine braking" at not-so-steep-ramp? Thanks. > > > The only time I might manually down shift and automatic is when > > traveling on roads which constantly change from uphill to downhill and > > thus cause a lot of extra shifting of the transmission. > > > John |
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ExtremeValue wrote:
>>> Unless there is a reason why the brakes are not up to the job, I use >>> them to do all of my slowing down.for a lightweight vehicle in ordinary use, you can get away with this >> just fine. for a heavy vehicle, or a vehicle in heavy use, it's a >> highly dangerous habit to be in. use engine braking and keep your >> brakes cool for when you may really need them. >> >> > > If engine braking is a good thing to do, then why do I see roadside > message saying "Please avoid use of engine braking" at > not-so-steep-ramp? because the jake brakes on trucks make too much noise for residential neighborhoods!!! why do /you/ think trucks have brakes like that??? > > Thanks. > > > >>> The only time I might manually down shift and automatic is when >>> traveling on roads which constantly change from uphill to downhill and >>> thus cause a lot of extra shifting of the transmission. >>> John > |
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"ExtremeValue" <raheem@gmail.com> wrote in message
news:1163742310.963913.22270@b28g2000cwb.googlegro ups.com... > > >> > Unless there is a reason why the brakes are not up to the job, I use >> > them to do all of my slowing down.for a lightweight vehicle in ordinary >> > use, you can get away with this >> just fine. for a heavy vehicle, or a vehicle in heavy use, it's a >> highly dangerous habit to be in. use engine braking and keep your >> brakes cool for when you may really need them. >> >> > > If engine braking is a good thing to do, then why do I see roadside > message saying "Please avoid use of engine braking" at > not-so-steep-ramp? > > Thanks. > Or "engine braking prohibited." I don't know why such ambiguous wording is used, and the "unmuffled engine braking prohibited" variation doesn't clear it up much. All of those refer to big rigs that use engine compression brakes, often called "jake brakes." I'm sure you've heard them on the highway in rural areas - a loud "brappppppppp" that can be heard a mile away. That's why they are restricted. Braking by selecting a lower gear is not only allowed, for heavily laden trucks it is mandatory. The CDL study guide here in Arizona - probably the same in all the lower 48 - warns a hill should be descended in the same gear that was used to ascend it. Mike |
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Michael Pardee wrote: > > "ExtremeValue" <raheem@gmail.com> wrote in message > news:1163742310.963913.22270@b28g2000cwb.googlegro ups.com... > > > > >> > Unless there is a reason why the brakes are not up to the job, I use > >> > them to do all of my slowing down.for a lightweight vehicle in ordinary > >> > use, you can get away with this > >> just fine. for a heavy vehicle, or a vehicle in heavy use, it's a > >> highly dangerous habit to be in. use engine braking and keep your > >> brakes cool for when you may really need them. > >> > >> > > > > If engine braking is a good thing to do, then why do I see roadside > > message saying "Please avoid use of engine braking" at > > not-so-steep-ramp? > > > > Thanks. > > > > Or "engine braking prohibited." I don't know why such ambiguous wording is > used, and the "unmuffled engine braking prohibited" variation doesn't clear > it up much. All of those refer to big rigs that use engine compression > brakes, often called "jake brakes." I'm sure you've heard them on the > highway in rural areas - a loud "brappppppppp" that can be heard a mile > away. That's why they are restricted. Braking by selecting a lower gear is > not only allowed, for heavily laden trucks it is mandatory. The CDL study > guide here in Arizona - probably the same in all the lower 48 - warns a hill > should be descended in the same gear that was used to ascend it. > > Mike Ever notice that brand new trucks don't make much noise when braking? Seems, (at least around these heeyah pawts), that owner/operators have a nasty habit of removing the muffling material from their exhaust "to be kewel" or worse, to "increase power." These are mostly gravel and construction trucks. I a big fan of engine braking and down shift on stops as a regular practice. Of course on my vintage tin with automatics, engine braking is automatically applied when ever you take your foot off the gas.... JT |
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I do a lot of mountain driving.
Downshifting saves your brakes. You dont want them to go out after hours of using them. A rule of thumb is, if you are using your brakes a lot, then you are driving incorrectly. (Applies to flat land driving too.) I can usually tell who the tourons are by excessive brake lights. |
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