05-03-2012, 11:49 PM | #23 |
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In the case of auto box, I’m assuming that the braking process is split it two parts. The first part where the auto box down shifts to use engine braking alone and then the 2nd part when the actual braking begins to activate. Is the transformation from the 1st part to the 2nd seamless or is there some kind of indication available there? Thx.
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05-04-2012, 10:11 AM | #24 | |
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Using the brakes briefly will intitiate engine braking. On a descent a quick dab on the brakes will instigate a down change, or two, if the brakes are dabbed hard enough. The box then typically holds the gear until you add a bit of throttle, to show you are wanting an up change. Also going downhill the 'box will change down, if the car speed increases, thus enhancing the engine braking effect. HighlandPete |
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05-04-2012, 10:47 AM | #25 |
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If engine braking isn't really a factor on the N20, what's happening when I press the decelerate switch on the steering wheel when cruise control is engaged?
It definitely seems to slow the car down WAY more than just letting up on the gas pedal does without cruise engaged. Does the cruise actually engage the brakes if you press down on the decelerate switch hard enough? And if so, do the brake lights come on? |
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05-04-2012, 11:04 AM | #26 | |
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05-04-2012, 11:11 AM | #27 | |
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05-04-2012, 09:42 PM | #28 | |
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11-05-2012, 07:33 PM | #29 |
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this is all part of the efficient dynamics. Somehow in sport mode i notice the engine brake is much more noticeable once foot leaves throttle. As for the rest of the driver modes the engine braking is reduced to allow for maximum coasting thus better fuel efficiency.
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11-07-2012, 02:47 PM | #30 | |
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03-21-2022, 06:58 PM | #35 |
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I'm glad someone bumped this as I've learned maybe I shouldn't engine brake as much as I used to in my e46. I have a steep hill near me, 2nd doesn't hold the car, and if I drop to first, the car sounds like it doesn't like revving to 5k rpms. Guess I'll just use my brakes more.
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03-22-2022, 04:04 PM | #36 |
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I noticed and posted the same thing within a month of ownership on our car, every other vehicle I've driven has had noticeable engine braking, whether auto or manual, the bummer though was almost non existent until you started dropping 3 or 4 gears and pushing the tach almost to the red line.... hardly a good compromise.
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03-22-2022, 08:17 PM | #37 | |
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As much as I downshift all the time and let it engine brake, its the wrong approach in most situations. Brake pads are cheap and easy to replace, transmissions and clutches are not. |
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03-24-2022, 09:27 AM | #38 | |
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03-24-2022, 09:29 AM | #39 | ||
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03-24-2022, 11:27 AM | #40 |
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I have a 6-speed and downshift a good bit for braking, but you're right it certainly doesn't slow the car down like older cars. I pump the gas a tic to rev-match. Last time I had a 340i loaner I noticed downshifting slowed the car noticeably more than my 4 cylinder.
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03-24-2022, 03:20 PM | #41 | |
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03-24-2022, 06:09 PM | #42 | |
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What's the equivalent of the old 'swingometer' indicating mpg wise? Any other abnormalities? Like revs hanging on, rather than dropping fast, back to idle? |
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03-24-2022, 07:39 PM | #43 | |
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I'm willing to bet what you are missing is the converter locking up which usually adds 10% more engine braking due to it bypassing the converter slippage losses. Just a thought... does it act the same in all modes? Maybe comfort/eco doesn't lock, but sport/sport+ does? I drive sport 100% of the time so I haven't paid attention to the other modes. |
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03-24-2022, 07:47 PM | #44 | |
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Also, if you guys think something is wrong, you can datalog decel and see what it looks like (TPS, AFRs, load target, etc) |
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