Go Back   EcoModder Forum > Introductions
Register Now
 Register Now
 

Reply  Post New Thread
 
Submit Tools LinkBack Thread Tools
Old 06-26-2008, 11:50 AM   #1 (permalink)
EcoModding Apprentice
 
bryn's Avatar
 
Join Date: Jun 2008
Location: trumansburg NY
Posts: 162

sputnik - '93 oldsmobile silhouette
90 day: 23.23 mpg (US)

home sweet home - '92 ford clubwagon E-350 xlt

very excelant - '92 honda civic vx
Thanks: 16
Thanked 10 Times in 10 Posts
vacuum brakes

has anyone tried to add a vacuum tank for EOC with power brakes?

__________________
  Reply With Quote
Alt Today
Popular topics

Other popular topics in this forum...

   
Old 06-26-2008, 12:01 PM   #2 (permalink)
Administrator
 
Daox's Avatar
 
Join Date: Dec 2007
Location: Germantown, WI
Posts: 11,203

CM400E - '81 Honda CM400E
90 day: 51.49 mpg (US)

Daox's Grey Prius - '04 Toyota Prius
Team Toyota
90 day: 49.53 mpg (US)

Daox's Insight - '00 Honda Insight
90 day: 64.33 mpg (US)

Swarthy - '14 Mitsubishi Mirage DE
Mitsubishi
90 day: 56.69 mpg (US)

Daox's Volt - '13 Chevrolet Volt
Thanks: 2,501
Thanked 2,585 Times in 1,553 Posts
I don't know about your cars, but I get a good three pumps on my brakes before I'm out of vacuum. This is enough vacuum 99% of the time. Plus, part of ecodriving is not using your brakes.
__________________
Current project: A better alternator delete
  Reply With Quote
Old 06-26-2008, 12:09 PM   #3 (permalink)
EcoModding Apprentice
 
bryn's Avatar
 
Join Date: Jun 2008
Location: trumansburg NY
Posts: 162

sputnik - '93 oldsmobile silhouette
90 day: 23.23 mpg (US)

home sweet home - '92 ford clubwagon E-350 xlt

very excelant - '92 honda civic vx
Thanks: 16
Thanked 10 Times in 10 Posts
i have one 5% grade for three miles speed limit 30mph and one 6+ % speed limit 55 hard with an auto
__________________
  Reply With Quote
Old 06-26-2008, 12:19 PM   #4 (permalink)
Master EcoModder
 
ttoyoda's Avatar
 
Join Date: May 2008
Location: boston ma
Posts: 381
Thanks: 0
Thanked 5 Times in 5 Posts
Quote:
i have one 5% grade for three miles speed limit 30mph and one 6+ % speed limit 55 hard with an auto
Is it possible to (safely) shift the auto into a lower range and have it stay there while you go down the hills? Then you might not need brakes.
  Reply With Quote
Old 06-26-2008, 12:25 PM   #5 (permalink)
EcoModding Apprentice
 
bryn's Avatar
 
Join Date: Jun 2008
Location: trumansburg NY
Posts: 162

sputnik - '93 oldsmobile silhouette
90 day: 23.23 mpg (US)

home sweet home - '92 ford clubwagon E-350 xlt

very excelant - '92 honda civic vx
Thanks: 16
Thanked 10 Times in 10 Posts
no i have to neutral to turn off and stop the motor then urn back on for speed and odometer.
__________________
  Reply With Quote
Old 06-26-2008, 12:28 PM   #6 (permalink)
EcoModding Apprentice
 
bryn's Avatar
 
Join Date: Jun 2008
Location: trumansburg NY
Posts: 162

sputnik - '93 oldsmobile silhouette
90 day: 23.23 mpg (US)

home sweet home - '92 ford clubwagon E-350 xlt

very excelant - '92 honda civic vx
Thanks: 16
Thanked 10 Times in 10 Posts
i could idle in a lower gear but its a 3.8 liter engine lots of gas just to do that
__________________
  Reply With Quote
Old 06-26-2008, 12:34 PM   #7 (permalink)
Master EcoModder
 
ttoyoda's Avatar
 
Join Date: May 2008
Location: boston ma
Posts: 381
Thanks: 0
Thanked 5 Times in 5 Posts
I take it your plan is add an additional volume to hold vacuum (sic) and plumb it in between the brake booster and the checkvalve in the brake booster line. For example if you had an big propane tank which you emptied, unscrewed the valve, cleaned out the oil that will be on the bottom, etc. you would use this as the tank. It sounds reasonable.

The down side of this is that it would take LONGER for the engine to establish a new vaccum if you used it all up while the engine was off. But if you plan ahead it could be OK. And it is better than no power brakes at all.
  Reply With Quote
Old 06-26-2008, 12:35 PM   #8 (permalink)
Master EcoModder
 
ttoyoda's Avatar
 
Join Date: May 2008
Location: boston ma
Posts: 381
Thanks: 0
Thanked 5 Times in 5 Posts
just to add, I think the vacuum is only used while you are changing the position of the brake pedal. If you keep the brakes pressed the same amount and don't move the pedal I don't think you lose the vacuum.
  Reply With Quote
Old 06-26-2008, 12:47 PM   #9 (permalink)
EcoModding Apprentice
 
bryn's Avatar
 
Join Date: Jun 2008
Location: trumansburg NY
Posts: 162

sputnik - '93 oldsmobile silhouette
90 day: 23.23 mpg (US)

home sweet home - '92 ford clubwagon E-350 xlt

very excelant - '92 honda civic vx
Thanks: 16
Thanked 10 Times in 10 Posts
yeah i guess i'll see what i can find for a tank, go from there. thanks for you thoughts on this
__________________
  Reply With Quote
Old 06-26-2008, 01:04 PM   #10 (permalink)
Administrator
 
Daox's Avatar
 
Join Date: Dec 2007
Location: Germantown, WI
Posts: 11,203

CM400E - '81 Honda CM400E
90 day: 51.49 mpg (US)

Daox's Grey Prius - '04 Toyota Prius
Team Toyota
90 day: 49.53 mpg (US)

Daox's Insight - '00 Honda Insight
90 day: 64.33 mpg (US)

Swarthy - '14 Mitsubishi Mirage DE
Mitsubishi
90 day: 56.69 mpg (US)

Daox's Volt - '13 Chevrolet Volt
Thanks: 2,501
Thanked 2,585 Times in 1,553 Posts
For long grades like that you can always use the e-brake for small amounts of braking so you don't use up your vacuum.

__________________
Current project: A better alternator delete
  Reply With Quote
Reply  Post New Thread


Thread Tools


Similar Threads
Thread Thread Starter Forum Replies Last Post
Woo Vacuum Pump! trebuchet03 The Lounge 10 05-14-2010 12:52 PM
Fiberglass or vacuum molded grill plug? JJW DIY / How-to 2 06-10-2008 01:12 PM
Vacuum gauge problems :( DifferentPointofView Instrumentation 3 05-14-2008 11:04 PM
Brakes, EOC (engine off coasting) and reserve vacuum Lazarus Hypermiling / EcoDriver's Ed 5 01-24-2008 08:17 PM
ABS Brakes Saved Me Today DifferentPointofView The Lounge 7 01-15-2008 08:20 PM



Powered by vBulletin® Version 3.8.11
Copyright ©2000 - 2024, vBulletin Solutions Inc.
Content Relevant URLs by vBSEO 3.5.2
All content copyright EcoModder.com