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Old 05-27-2021, 01:39 PM   #291 (permalink)
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His (Benny) - '06 Honda Insight MT
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Last 3: 78.73 mpg (US)

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Quote:
Originally Posted by Autobahnschleicher View Post
Realy dumb question:
Could I reduce my parasitic drag from the alternator by using a DC-DC converter and an additional battery to keep my cars battery fully charged the entire time?
Basicly using one or more powertool batteries to keep the cars battery charged and the inefficient alternator from doing anything.

I've got 12 Ah worth of 18V LiIon batteries, that should keep the battery charged up for quite a while.
You'd have the losses from the DC-DC but it would eliminate the loss from the alternator if you could find a way to turn it off. Sounds a lot more complicated than just building a higher capacity 12V battery.

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Old 05-27-2021, 02:20 PM   #292 (permalink)
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Aerospyder - '00 Toyota MR2 Spyder
Team Toyota
90 day: 39.67 mpg (US)

Simme - '83 IFA Simson Suhl S51
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The Idea obviously includes charging the 18V batteries externaly and using them to charge the 12V battery via a step down DC-DC to keep the battery charged at 100% all the time.
This causes the alternator to not charge the battery, wich should reduce parasitic drag.
Removing /bypassing it would be rather complicated in my car as it sits in front of the engine behind the firewall and under the roof.
It's REALY hard to reach.
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Old 05-27-2021, 02:34 PM   #293 (permalink)
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Blackfly - '98 Geo Metro
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Last 3: 70.09 mpg (US)

MPGiata - '90 Mazda Miata
90 day: 52.07 mpg (US)

Winter beater Metro - '00 Chevrolet Metro
90 day: 61.98 mpg (US)

Fancy Metro - '14 Mitsubishi Mirage top spec
90 day: 58.72 mpg (US)

Even Fancier Metro - '14 Mitsubishi Mirage top spec
90 day: 70.75 mpg (US)
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Autobahnschleicher - you could do it either way.


Daox set up his Mirage to feed the alternator ~15 V via a DC-DC converter, which effectively turns the alternator off to reduce engine load & save fuel.



This also gives him the option of 12v regeneration via a switch tied to the brake lights. EG. Activate regen when going down hills [if trying to hold speed] or when actually decelerating.


Most of his regeneration happens by recharging the battery from the grid though. Regen just extends "range" a bit.



Thread: A better alternator delete
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Honda mods: Ecomodding my $800 Honda Fit 5-speed beater
Mitsu mods: Oops, I did it again! Bought another cheap, 3-cylinder Mirage. Mods in progress...
Ecodriving test: Manual vs. automatic transmission MPG showdown



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www.MetroMPG.com - fuel efficiency info for Geo Metro owners
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Old 05-27-2021, 02:34 PM   #294 (permalink)
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Blackfly - '98 Geo Metro
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Last 3: 70.09 mpg (US)

MPGiata - '90 Mazda Miata
90 day: 52.07 mpg (US)

Winter beater Metro - '00 Chevrolet Metro
90 day: 61.98 mpg (US)

Fancy Metro - '14 Mitsubishi Mirage top spec
90 day: 58.72 mpg (US)

Even Fancier Metro - '14 Mitsubishi Mirage top spec
90 day: 70.75 mpg (US)
Thanks: 3,808
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Quote:
Originally Posted by PaleMelanesian View Post
I can answer that one: Because the engine is off for the downhill glide. With no engine running, there is nothing to run the alternator.

Yessir.
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Mitsu mods: Oops, I did it again! Bought another cheap, 3-cylinder Mirage. Mods in progress...
Ecodriving test: Manual vs. automatic transmission MPG showdown



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Old 06-05-2021, 08:03 PM   #295 (permalink)
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Black and Green - '98 Honda Civic DX Coupe
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90 day: 66.42 mpg (US)

Black and Red - '00 Nashbar Custom built eBike
90 day: 3671.43 mpg (US)
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I am reviving this challenge for this summer. I have hardly driven my car in a year, and it currently is not even SMOG TESTED. I have coolant leaks, rusted disc brakes, and a pesky intermittent wiring problem. But I am on it and wanna get it back to legal and rolling for the return to in-person work in a little while.

CHALLENGE RENEWED. See post #1 to "get it" and understand.
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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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Old 06-05-2021, 09:22 PM   #296 (permalink)
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Blackfly - '98 Geo Metro
Team Metro
Last 3: 70.09 mpg (US)

MPGiata - '90 Mazda Miata
90 day: 52.07 mpg (US)

Winter beater Metro - '00 Chevrolet Metro
90 day: 61.98 mpg (US)

Fancy Metro - '14 Mitsubishi Mirage top spec
90 day: 58.72 mpg (US)

Even Fancier Metro - '14 Mitsubishi Mirage top spec
90 day: 70.75 mpg (US)
Thanks: 3,808
Thanked 6,686 Times in 3,466 Posts
I didn't realize it was on hiatus... I thought it was just me.
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Honda mods: Ecomodding my $800 Honda Fit 5-speed beater
Mitsu mods: Oops, I did it again! Bought another cheap, 3-cylinder Mirage. Mods in progress...
Ecodriving test: Manual vs. automatic transmission MPG showdown



EcoModder
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www.MetroMPG.com - fuel efficiency info for Geo Metro owners
www.ForkenSwift.com - electric car conversion on a beer budget
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Old 06-06-2021, 11:36 AM   #297 (permalink)
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Black and Green - '98 Honda Civic DX Coupe
Team Honda
90 day: 66.42 mpg (US)

Black and Red - '00 Nashbar Custom built eBike
90 day: 3671.43 mpg (US)
Thanks: 2,373
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Quote:
Originally Posted by MetroMPG View Post
I didn't realize it was on hiatus... I thought it was just me.
I had been making it a summer thing, so it "ended" and it was fun to see you renewing it earlier this Spring. Let's just make it a permanent summer game, every summer. We'll define summer loosely, say May 1 to Sept 30. I will edit the OP to reflect its annual-ness.
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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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Old 06-08-2021, 10:48 AM   #298 (permalink)
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Black and Green - '98 Honda Civic DX Coupe
Team Honda
90 day: 66.42 mpg (US)

Black and Red - '00 Nashbar Custom built eBike
90 day: 3671.43 mpg (US)
Thanks: 2,373
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Got links?

At the start of this Northern Hemisphere warm season, I'm reviving this challenge. Here is the list of the current record holders, people who got either a 70 mpg tank or a 70 mpg average on a single run. See post #1 for details of the challenge and the "prizes."

What I am looking for now is help finding profile and/or garage links for these vehicles:

THE LISTS OF WINNERS (in no particular order):

1. FTA (Full Tank Average)
PaleCivic (96 Civic DX)
PaleFit (08 Fit Sport)
Winter-beater-Metro (00 Chevy Metro)
BlackFly (98 Metro)
Sport Coupe (92 Ford Tempo GL)
AerocivicLB (92 Civic CX/VX)
The Little Car (00 Chevy Metro)
Nut Wagon (91 Civic Wagon DX)
Daox's Paseo (97 Toyota Paseo)
ecoDrudge (07 EU-spec Ford Fusion TDCi)
...others...?

2. SRA (Single Run Average)
Swarthy (14 Mitsubishi Mirage DE)
Black & Green (98 Honda Civic DX)
GreenTDI (11 Skoda Fabia Estate)
K-sight (00 Honda Insight de-hybridized with a K24 swap)
Mirage #2 (14 Mitsubishi Mirage SE)
... others ...?
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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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Old 06-09-2021, 09:40 PM   #299 (permalink)
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Join Date: Mar 2011
Location: Coastal Southern California
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Black and Green - '98 Honda Civic DX Coupe
Team Honda
90 day: 66.42 mpg (US)

Black and Red - '00 Nashbar Custom built eBike
90 day: 3671.43 mpg (US)
Thanks: 2,373
Thanked 2,155 Times in 1,463 Posts
Alright, by popular demand this challenge is now year round, all the time. I am adding links to the garage pages of the winners in post #1. Post a link if you have one and time to help me collect them.
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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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Old 06-10-2021, 04:28 AM   #300 (permalink)
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This is unfair because its canadian but my Smart CDI was quite good. I would race it around in kamloops(hill city, traffic, -30c to +45C) for a lifetime avg of 4.2L/100km

https://www.fuelly.com/car/smart/for...mespeed/759642

My 2001 corvette uses more fuel rolling down a steep highway hill than the smartcar used coming up the same hill at 100km/h.

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