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Old 04-04-2012, 09:18 PM   #1 (permalink)
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P&G EOC LOD BSFC(?) catching up...

So, I've been working on Pulse and Glide with Engine Off Coasting, and only accelerating downhill, then I come back and I find that the new thing everyone is talking about is BSFC.

I finally have my Ultra Gauge and I'd like to catch up, but I'm finding info a little bit strewn about.

What are we currently experimenting with in terms of driving technique that would greatly improve my fuel efficiency and how should I be setting up UG to assist me in this venture?

I'm assuming a page1 with engine load, Instant L/100km, torque something, RPM, average L/100km...

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Old 04-04-2012, 10:47 PM   #2 (permalink)
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Quote:
Originally Posted by ace0snipe View Post
how should I be setting up UG ... ?

I'm assuming a page1 with engine load, Instant L/100km, torque something, RPM, average L/100km...
These days, I have my UG page 1 set up this way:

Longterm fuel trim and Load% across the top.
O2 and coolant temp lower left.
RPM and trip MPG lower right.
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Old 04-05-2012, 08:12 AM   #3 (permalink)
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P&G is all about reducing BSFC. To P&G at peak efficiency you'll likely need to do some testing on your own, but the general rule is ~80% load and keep rpm under 2500 or so. Each engine's peak efficiency point will be different, but this seems to be the area where most fall.

For the record I prefer to accelerate up a hill and coast down. It helps maintain a more constant speed. It also seems more natural since you need power when you're going up a hill, not down.
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Old 04-05-2012, 12:32 PM   #4 (permalink)
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Ok, what gauges would I need to display to do this efficiently?

My current display:

Inst. L/100KM | Avg L/100KM
========================
torque Nm | Engine load%
Inst. L/H | Avg L/H

I haven't been able to find any "tutorial" threads. Just some general information.

Also I noticed that while cruising in gear (I know, I know...) that the mileage seems to be better at 90 KMH than 80KMH or 100KMH. Which is weird because I would think the slower you're going the more gas your going to save.

Is this due to better torque for approximately the same engine load causing more speed to cover more distance for relatively same fuel consumption? Is that what BSFC is? If that is it, how do I apply that idea to accelerating when P&G? Engine load and fuel consumption will be spiking and then dropping, Will the UG be able to calculate that?

My current P&G strategy has been based on speed and coming back I noticed that people are using time. So I've been accelerating to ~80KMH and dropping to ~60KMH and accelerating slowly back up. This seems to be against the idea that's currently going around which is to accelerate quickly and use the momentum to glide.
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Old 04-05-2012, 01:02 PM   #5 (permalink)
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Throttle % | Inst. MPG
==================
DTE | MPG Trip
Inst. GPH | Coolant Temp

I used to have load in the upper left, but it wasn't all that helpful. If I ever get to hacking in a kill switch it'll be:

Throttle % | Inst. MPG
===================
Inst. GPH |Short Trip MPG
Coolant Temp | MPG Trip
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Transmission type Efficiency
Manual neutral engine off.100% @MPG <----- Fun Fact.
Manual 1:1 gear ratio .......98%
CVT belt ............................88%
Automatic .........................86%

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Old 04-05-2012, 03:01 PM   #6 (permalink)
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RPM and Engine Load are the key items here.

I like to run my pulses in the 1500-2100 rpm range, at ~85% load. Like Daox, I pulse uphill and coast down. I find a speed range of about 15 mph works well. (25-40 mph or 35-50) Pulse from the low speed up to the top, then EOC down until you hit the lower speed again.

Keep an eye on the trip average mpg. Try to keep it moving up at the end of each p&g cycle. Particularly, at the end of the glide. Do whatever pulse you need to get up to speed, but then use the glide to make your numbers.
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Old 04-05-2012, 05:10 PM   #7 (permalink)
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Sorry to hijack the thread, but this question could probably help others too. My biggest issue with P&G on the highway is the hills. So here is a scenario. Lets say you have just coasted down a hill and are facing a long hill with a moderate grade. Do you accelerate to your target speed at 85% load and then coast again even on the uphill, or do you reach your target speed and then stay there until the top?
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Old 04-06-2012, 08:00 AM   #8 (permalink)
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I do both, depending on how much energy I have at the moment. Sometimes when I'm beat I just hit the cruise at a little below the PSL.
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Quote:
Originally Posted by sheepdog44 View Post
Transmission type Efficiency
Manual neutral engine off.100% @MPG <----- Fun Fact.
Manual 1:1 gear ratio .......98%
CVT belt ............................88%
Automatic .........................86%

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Old 04-06-2012, 10:22 AM   #9 (permalink)
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Quote:
Originally Posted by cbaber View Post
Sorry to hijack the thread, but this question could probably help others too. My biggest issue with P&G on the highway is the hills. So here is a scenario. Lets say you have just coasted down a hill and are facing a long hill with a moderate grade. Do you accelerate to your target speed at 85% load and then coast again even on the uphill, or do you reach your target speed and then stay there until the top?
Bold is my answer.
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Old 04-06-2012, 12:28 PM   #10 (permalink)
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Quote:
Originally Posted by cbaber View Post
Sorry to hijack the thread, but this question could probably help others too. My biggest issue with P&G on the highway is the hills. So here is a scenario. Lets say you have just coasted down a hill and are facing a long hill with a moderate grade. Do you accelerate to your target speed at 85% load and then coast again even on the uphill, or do you reach your target speed and then stay there until the top?
You might also want to see this test I ran on coasting uphill on freeways: http://ecomodder.com/forum/showthrea...tml#post252933

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See my car's mod & maintenance thread and my electric bicycle's thread for ongoing projects. I will rebuild Black and Green over decades as parts die, until it becomes a different car of roughly the same shape and color. My minimum fuel economy goal is 55 mpg while averaging posted speed limits. I generally top 60 mpg. See also my Honda manual transmission specs thread.



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