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Thread: Optimizing Accel and Decel Reply to Thread
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Topic Review (Newest First)
09-06-2012 11:52 AM
kam327
Quote:
Originally Posted by Fresh1 View Post
Yes, that sucks. But when there's not too much traffic, it's nice to breeze past them just as the light changes, and pull away as they shrink in the mirror!
Yep, doesn't happen real often but when it does it's sweet!
09-06-2012 11:45 AM
Fresh1
Quote:
Originally Posted by TboneZX3 View Post
I cheer for those guys. They race ahead and trigger the light so I don't have to stop.
Quote:
Originally Posted by kam327 View Post
I just hate it when they pass me then merge into my lane, putting me further back in the train of cars.
Yes, that sucks. But when there's not too much traffic, it's nice to breeze past them just as the light changes, and pull away as they shrink in the mirror!
09-06-2012 11:31 AM
kam327
Quote:
Originally Posted by TboneZX3 View Post
I cheer for those guys. They race ahead and trigger the light so I don't have to stop.
I just hate it when they pass me then merge into my lane, putting me further back in the train of cars.
09-06-2012 11:19 AM
Fresh1
Quote:
Originally Posted by TboneZX3 View Post
I cheer for those guys. They race ahead and trigger the light so I don't have to stop.
Good Point!
09-06-2012 11:15 AM
TboneZX3
Quote:
Originally Posted by Fresh1 View Post
Yes, I always find it entertaining to see drivers rush up to the red light as if they have the devil on their backs, or that they somehow think they can intimidate the light into changing green faster just for them!
I cheer for those guys. They race ahead and trigger the light so I don't have to stop.
09-06-2012 11:12 AM
Fresh1
Quote:
Originally Posted by kam327 View Post
Yes, that's what I would do too. Whatever you can do to avoid having to accelerate from 0 back up to cruising speed is paramount and trumps any of the decel scenarios.
Yes, I always find it entertaining to see drivers rush up to the red light as if they have the devil on their backs, or that they somehow think they can intimidate the light into changing green faster just for them!
09-06-2012 10:49 AM
kam327
Quote:
Originally Posted by Fresh1 View Post
I see what you're saying. I was thinking of the scenario where you're on a very quiet road, and you see a red light far ahead (the kind that can stay red 'forever'). In that kind of case, I would just coast in D until the light changed ... then BOOT IT cuz of the gas I had just saved!
Yes, that's what I would do too. Whatever you can do to avoid having to accelerate from 0 back up to cruising speed is paramount and trumps any of the decel scenarios. I'm just talking about when you know you'll have to stop no matter what, like a stop sign or a train crossing.
09-06-2012 10:21 AM
Fresh1
Quote:
Originally Posted by kam327 View Post
Technically I can imagine that might burn even less fuel, sure. But I guess it seems to me that scenario is less practical in an everyday sense than the two I considered. Who wants to slow way down in the beginning and then creep along at 10mph or so that final 1 or 2 tenths of a mile to the stop? True "creeping" is thought to be hard on the DCT clutches, plus you're going to royally piss off anyone behind you. That might be delving into "hypermiling" territory, whereas all I want to do is do some "easy" stuff in the hopes of increasing MPG by a modest 1 or so.
I see what you're saying. I was thinking of the scenario where you're on a very quiet road, and you see a red light far ahead (the kind that can stay red 'forever'). In that kind of case, I would just coast in D until the light changed ... then BOOT IT cuz of the gas I had just saved!
09-06-2012 10:08 AM
kam327
Quote:
Originally Posted by Fresh1 View Post
I am thinking along the same lines as suss6052 ... If you know you have to slow down, why not take your foot off the gas at the start of the "test stretch", slow down in gear (faster than in N due to engine braking) and then just creep along for the rest of the stretch? ... Maybe this would use even less fuel than slowing down in neutral? (i.e. in actual driving I wouldn't wait to slow down like in your nifty test! :) ...
Technically I can imagine that might burn even less fuel, sure. But I guess it seems to me that scenario is less practical in an everyday sense than the two I considered. Who wants to slow way down in the beginning and then creep along at 10mph or so that final 1 or 2 tenths of a mile to the stop? True "creeping" is thought to be hard on the DCT clutches, plus you're going to royally piss off anyone behind you. That might be delving into "hypermiling" territory, whereas all I want to do is do some "easy" stuff in the hopes of increasing MPG by a modest 1 or so.
09-06-2012 09:58 AM
Fresh1
Quote:
Originally Posted by suss6052 View Post
The question is what if you're going to have to stop anyway, why would you hold the higher speed longer before coasting in gear vs coasting in neutral to try and maintain a higher speed at the end of the coast?
Quote:
Originally Posted by kam327 View Post
Is that a question for me? Again, my assumption is that you want to reach the stop at the same speed either way, so you can coast longer in neutral because your rate of deceleration will be less without the drag of the engine.
I am thinking along the same lines as suss6052 ... If you know you have to slow down, why not take your foot off the gas at the start of the "test stretch", slow down in gear (faster than in N due to engine braking) and then just creep along for the rest of the stretch? ... Maybe this would use even less fuel than slowing down in neutral? (i.e. in actual driving I wouldn't wait to slow down like in your nifty test! :) ...
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