Go Back   EcoModder Forum > EcoModding > EcoModding Central
Register Now
 Register Now
 

Reply  Post New Thread
 
Submit Tools LinkBack Thread Tools
Old 03-19-2013, 03:47 PM   #11 (permalink)
Master EcoModder
 
Join Date: Sep 2009
Posts: 5,927
Thanks: 877
Thanked 2,024 Times in 1,304 Posts
Another advantage is the fuel can absorb engine heat which improves atomization. In the return systems a lot of that heat was returned to the tank and over some time would warm it up measurably and, as previously mentioned, increase evap emissions, which are generally offset by reduced fuel delivery from the injectors.

regards
Mech

  Reply With Quote
The Following User Says Thank You to user removed For This Useful Post:
Blue Angel (03-19-2013)
Alt Today
Popular topics

Other popular topics in this forum...

   
Old 03-19-2013, 08:59 PM   #12 (permalink)
EcoModding Apprentice
 
Blue Angel's Avatar
 
Join Date: Feb 2013
Location: Ottawa, ON, Canada
Posts: 190

Previous Car - '12 Chevrolet Cruze Eco MT
Team Chevy
90 day: 44.29 mpg (US)

535d XDrive - '16 BMW 535d M-Sport
Thanks: 17
Thanked 59 Times in 38 Posts
Quote:
Originally Posted by Old Mechanic View Post
In the return systems a lot of that heat was returned to the tank...
Thanks for adding that! I realized I didn't put that in there after posting and was too lazy to add it.
__________________
2016 BMW 535d
4100lb XDrive Eco-Yacht
  Reply With Quote
Old 03-20-2013, 09:29 AM   #13 (permalink)
Master EcoModder
 
Join Date: Oct 2011
Location: ellington, ct
Posts: 829
Thanks: 44
Thanked 104 Times in 80 Posts
The voltage to the FP on my '90 Toyota pickup (motorhome) varies. I assume that means it has the ability to vary pump power output. I think there is a return line, but, I'm not sure. Maybe Toyota was already doing this 23 years ago?
  Reply With Quote
Old 05-09-2013, 11:39 PM   #14 (permalink)
Busting Knuckles Often
 
Join Date: Aug 2012
Location: SE Michigan
Posts: 135

Blue Maxx - '04 Chevrolet Malibu Maxx LT
Team Chevy
90 day: 26.96 mpg (US)

Tink's Van - '08 Chrysler Town & Country Touring
90 day: 19.09 mpg (US)

2004 5 Speed Goldrolla - '04 Toyota Corolla CE
Team Toyota
90 day: 36.3 mpg (US)
Thanks: 313
Thanked 28 Times in 20 Posts
Some data to add

Quote:
Originally Posted by Blue Angel View Post
Found this old thread and wanted to add some info.

The newer systems like the one in the Cruze use an intelligent driver to manipulate the fuel pump RPM to vary fuel pressure and flow as required. As far as I know, no pressure regulator is used so every bit of gas pumped by the fuel pump is required by the engine. It wouldn't surprise me if lots of vehicles are using this system by now.
I don't know how prevalent they are yet, but ther are coming soon.

An Electronics supplier showed me today, as an example about the power of Matlab software, a PWM ECM controlled variable speed fuel pump with feedback loop to maintain the exact pressure at all times.

On a sample Mini Cooper run through Matlab Simulink, baseline fuel pump was 95 watts constant. Variable speed was averaging in the 55 watt range. And a brushless variable speed was in the 30 watt range.

To convert to theoretical FE changes, more Matlab analysis indicated a 0.5% to 1.5% FE increase due to reduction in alternator load. They considered this low hanging fruit, even though it was small, but measurable, FE improvement.
__________________


  Reply With Quote
The Following User Says Thank You to WesternStarSCR For This Useful Post:
Blue Angel (05-12-2013)
Old 05-10-2013, 11:23 AM   #15 (permalink)
...beats walking...
 
Join Date: Jul 2009
Location: .
Posts: 6,190
Thanks: 179
Thanked 1,525 Times in 1,126 Posts
Yep, every 746 Watts of electric "load" is another horsepower you're feeding gasoline to.
  Reply With Quote
The Following User Says Thank You to gone-ot For This Useful Post:
WesternStarSCR (05-10-2013)
Old 03-25-2019, 07:19 PM   #16 (permalink)
EcoModding Lurker
 
Join Date: Mar 2011
Location: Virginia
Posts: 7
Thanks: 0
Thanked 0 Times in 0 Posts
Quote:
Originally Posted by gone-ot View Post
...they're also touting their Regulated Voltage Control (RVC) system that is effectively an "on-demand only" field regulator system that holds battery voltage at ~ 12.3VDC instead of 14.7VDC all the time.

...instead, it only pumps the voltage up to 14.7VDC right after a heavy load (starting) then backs off to ~12.3VDC while cruising; but, goes back UP in alternator output voltage (if needed) during decelerations and breakings.

...good news for lamps and light bulbs, but not so good on batterys themselves.
After 8 years of owning a cruze with this system it has been so so on the bubs, it eats about 1-2 headlights per year but no other bulbs. Insofar as the battery, the OEM battery lasted 6 years. I too feared that the alternator would be hard on batteries but 6 years out of a battery these days isn't bad.
  Reply With Quote
Old 03-26-2019, 01:59 PM   #17 (permalink)
Thalmaturge
 
Join Date: Mar 2011
Location: The edge of nowhere
Posts: 1,156

The Tinyvan - '07 Honda Fit Sport

Spicy Italian - '13 Fiat 500 Abarth

eBike - '94 Trek Mountain Track 820
Thanks: 763
Thanked 637 Times in 424 Posts
Holy necro posting, batman!
  Reply With Quote
Old 03-26-2019, 04:07 PM   #18 (permalink)
Master EcoModder
 
Join Date: Jan 2011
Location: na
Posts: 1,025
Thanks: 277
Thanked 218 Times in 185 Posts
If you are buying you headlights at Walmart, stop they are only rated 150 hours. Go to rockauto or similar and get some Long Life bulbs for $6 each went with Hella's for the cobalts and Impala.. I finally started tracking when I replaced them and 150 hours is about it on the last one.

The impala also drops to low 12's a lot, asked when it was in for something else and they said it was normal.

  Reply With Quote
Reply  Post New Thread


Thread Tools




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