Go Back   EcoModder Forum > EcoModding > DIY / How-to
Register Now
 Register Now
 

Reply  Post New Thread
 
Submit Tools LinkBack Thread Tools
Old 08-25-2008, 09:19 AM   #11 (permalink)
EcoModding Lurker
 
Join Date: Aug 2008
Location: Virginia
Posts: 87

Brown Bus - '98 GMC Sonoma X-Cab SLS
90 day: 31.37 mpg (US)
Thanks: 0
Thanked 2 Times in 2 Posts
Electrical concerns aside, fuel pumps are heat-sinked by a rather large quantity of sloshing fuel. Can't see a slight increase in heat produced making them much hotter. They fail when people run them dry - that's when they get hot.

The increase in resistive heat assumes an increase in current, which highes on a substantial decrease of inductive back emf. That is true for the case where shaft speed is reduced through application of a load - thus deflecting shaft speed from the free speed. In our case, simply decreasing the voltage (which by nature lowers the free speed of the motor, as well as the speed under load) at the SAME load does not produce the same effect.

Again, what if you were to use a 14 volt battery system rather than a 12 volt system? I just don't think a battery charger (or a power inverter) is going to be able to keep your primary charged when considering the loads of the vehicle.

__________________
Meh Truck
  Reply With Quote
Alt Today
Popular topics

Other popular topics in this forum...

   
Old 08-25-2008, 09:44 AM   #12 (permalink)
dcb
needs more cowbell
 
dcb's Avatar
 
Join Date: Feb 2008
Location:
Posts: 5,038

pimp mobile - '81 suzuki gs 250 t
90 day: 96.29 mpg (US)

schnitzel - '01 Volkswagen Golf TDI
90 day: 53.56 mpg (US)
Thanks: 158
Thanked 267 Times in 210 Posts
What evidence do any of you have that the systems weren't designed to operate at a reduced battery voltage? Alternator belts break and cars still run for a time, engineers know this. Sometimes alternators just stop working altogether and you don't know till you have a dead battery.

I think the "low voltage fear so go buy an inverter and two chargers and an extra deep cycle battery and lug them around" plan should be rethunk.
__________________
WINDMILLS DO NOT WORK THAT WAY!!!
  Reply With Quote
Old 08-25-2008, 09:50 AM   #13 (permalink)
EcoModding Lurker
 
Join Date: Aug 2008
Location: Virginia
Posts: 87

Brown Bus - '98 GMC Sonoma X-Cab SLS
90 day: 31.37 mpg (US)
Thanks: 0
Thanked 2 Times in 2 Posts
Quote:
Originally Posted by dcb View Post
What evidence do any of you have that the systems weren't designed to operate at a reduced battery voltage? Alternator belts break and cars still run for a time, engineers know this...
I'm with you there, but just supposing that there's a reason why everything operates at 13.5 normally.

I'd rather not test out how a SRS system works at 9 volts. However, in the case of airbag systems, they're designed to work in a compromised situation (a crash) so I'd think they could do the job.

Lights would be dimmer. Windows slower. My power locks already struggle when cold. A 14 volt battery system would be a nice way to avoid these things.
__________________
Meh Truck
  Reply With Quote
Old 08-28-2008, 01:40 PM   #14 (permalink)
Master EcoModder
 
Join Date: Jun 2008
Location: NorCal
Posts: 451
Thanks: 1
Thanked 40 Times in 26 Posts
No trying to discourage anyone from scrounging parts, but sometimes being able to order what you need is the way to go. There's a lot of battery options availble thru automotive performance catalogs, including 16v batteries, chargers, step down transformers, isolation switches, sealed battery boxes and battery relocation kits and charging lugs. Check out the battery disconect switch for $16, every dragrace car with a relocated battery is required to have one, so the cost has come down. These catalogs are a good place to steal ideas to suit your own ecomodder or other needs. As someone else mentioned, West Marie is a great source of all-weather 12v electrical items, I've used many of their electrical products on race cars and trailers, very superior reliability compared to the absolute junk sold at the chain auto parts stores.

Powermaster 16V Battery Accessories - JEGS

and

Powermaster XS Power Batteries - JEGS

  Reply With Quote
Reply  Post New Thread


Thread Tools


Similar Threads
Thread Thread Starter Forum Replies Last Post
VX Info...WARNING: lots of info! TomO Off-Topic Tech 1 01-05-2010 12:39 PM
how do i locate my speed sensor wire and injector wire? modmonster OpenGauge / MPGuino FE computer 5 01-13-2009 06:08 AM
Perhaps honda specific: Will a code 41 (o2 sensor heater) tank my mileage? SVOboy Off-Topic Tech 13 08-04-2008 09:35 PM
WTB: 1 wire o2 SVOboy For Sale 8 05-11-2008 06:01 AM
DIY - Wire Tuck SVOboy DIY / How-to 4 01-25-2008 02:14 AM



Powered by vBulletin® Version 3.8.11
Copyright ©2000 - 2021, vBulletin Solutions Inc.
Content Relevant URLs by vBSEO 3.5.2
All content copyright EcoModder.com