engine braking
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engine braking
i have an idea how engine braking works (caused by the engine's resistance to rotation via compression) . anywho this may be a dumb question but during engine braking does the computer do things to facilitate this, like changing the timing or fuel delivery?
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From: 29 Palms, California MCAGCC
Rep Power: 0 Sorry I dont have an answer for you, but Im curious why you want to know. Its just never been asked for, and if this site is dwindling down on things to say about our cars, then we need some new topics.
It somewhat depends on what kind of tranny you have. If you slow down most of the time by downshifting, then it would because the rpms are going up and down.
It somewhat depends on what kind of tranny you have. If you slow down most of the time by downshifting, then it would because the rpms are going up and down.
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Rep Power: 0 i guess i posted this b/c i was bored and it was something that i always wanted to know. [IMG]i/expressions/face-icon-small-tongue.gif[/IMG]
i really don't think its transmission dependent b/c an automatic can downshift also (or manually move from D to D3) albiet not with extreme prejudice of a manual. but i know that going for high to low rpm has something to do with it. the higher the rpms are the more engine braking you get.
anyway i just wanted to know what the ECU is thinking while this is going on.
i really don't think its transmission dependent b/c an automatic can downshift also (or manually move from D to D3) albiet not with extreme prejudice of a manual. but i know that going for high to low rpm has something to do with it. the higher the rpms are the more engine braking you get.
anyway i just wanted to know what the ECU is thinking while this is going on.
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Rep Power: 0 the ecu maintains any rpm specific changes but it doesnt specially retard timing or choke the motor or anything else like that when you're "engine braking"
Engine braking is just letting off the gas and slowing down because it takes more work to compress the cylinder than is being provided by the combustion stroke. The ecu doesn't really care if you're just letting off for the hell of it, or actually downshifting over and over to slow down.
IMHO my grandfather always said "It's easier to replace your brakeshoes(pads) than to replace your clutch" now of course, this refers to pulling up to a stop sign and going from 5th-1st clutching every time to slow down, not going down a hill and letting off to maintain/slow your speed. -- I'm drifting again......
to answer your question, the ECU doesn't do anything out of the ordinary when you engine brake, fuel delivery changes because you're not on the gas etc.... but its not like engine braking causes your ecu to do something it wouldn't when you just let off for a few seconds.....
av
Engine braking is just letting off the gas and slowing down because it takes more work to compress the cylinder than is being provided by the combustion stroke. The ecu doesn't really care if you're just letting off for the hell of it, or actually downshifting over and over to slow down.
IMHO my grandfather always said "It's easier to replace your brakeshoes(pads) than to replace your clutch" now of course, this refers to pulling up to a stop sign and going from 5th-1st clutching every time to slow down, not going down a hill and letting off to maintain/slow your speed. -- I'm drifting again......
to answer your question, the ECU doesn't do anything out of the ordinary when you engine brake, fuel delivery changes because you're not on the gas etc.... but its not like engine braking causes your ecu to do something it wouldn't when you just let off for a few seconds.....
av
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Rep Power: 0 actually engine breaking is done in a manual by downshifting...you can use that in conjuction with your brakes to improve your stoping distance...you just have to know ur engine and when to do it so you wont send the RPM's shooting up like crazy. 1-20 is 1st gear, 20-40 is 2nd gear, and so on. Thats what i usually follow in my car.
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