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

Reply  Post New Thread
 
Submit Tools LinkBack Thread Tools
Old 08-23-2008, 03:03 PM   #21 (permalink)
Master EcoModder
 
aerohead's Avatar
 
Join Date: Jan 2008
Location: Sanger,Texas,U.S.A.
Posts: 15,922
Thanks: 24,011
Thanked 7,230 Times in 4,656 Posts
If you could magically perform back-to-back tests,simultaneously,you could easily measure the difference.----------- One thing to consider.The alternator load may have been a design criteria for the cars powerplant design and may effect it's BSFC.----------------------------- By arbitrarily lowering the "load" on the engine,you could actually move it into a regime of lower efficiency.-----------------------------------------------I lost an alternator in Amarillo,Texas,in the CRX.It was going to be two days to get a part.I went to Walmart,bought a spare battery and battery charger.I drove,in two days,to Phoenix,Arizona,running constant-loss off the battery I charged in the motel room.I'd topped off the tank in Amarillo,and by Phoenix,I'd showed no measurable gain in MPG.------------------------------------ I have also purposefully removed the alternator belt and conducted mpg tests,and never showed any measureable difference.--------------------------- The CRX alt drops field exitation during acceleration,then resumes with manifold vacuum increase.--------------------- Also,cheap,adjustable,normally-closed vacuum switches can be adjusted to open-circuit the field,while under acceleration.----------------------- I've found the manufacturers systems so efficient,reliable and of little load,I no longer consider modifications to them for a daily driver.Just my opinion.

__________________
Photobucket album: http://s1271.photobucket.com/albums/jj622/aerohead2/
  Reply With Quote
Alt Today
Popular topics

Other popular topics in this forum...

   
Old 09-01-2008, 11:13 AM   #22 (permalink)
Master EcoModder
 
Join Date: Jul 2008
Location: united kingdom
Posts: 262

Tracy - '00 vauxhall corsa
Thanks: 0
Thanked 11 Times in 4 Posts
here is my system. i have 144v of NiMH batteries hooked up to the power inlet side of a power supply, (where you would normally plug it into the mains). you can put DC into these even though they usually work on AC. the other side it comes out at 15.5v. i selected 15.5v with the trimmer pot because it was closeest to 14.5v that the alternator tops off at yet still gave enough voltage difference to get a decent amount of power. the power supply is from ebay and is for a computer or something? its rated at 350watts. i have a watts up meter in the line to tell me whats going on. i didn't drill through the fire wall yet i just tapped into the cigarette lighter port.

the car drew about 130watts, 8amps whenever the engine was running. when full lights were switched on this went up to 170watts. the voltage settled at 15.2v. weird thing was i couldn't EOC with it plugged in. the engine wouldn't switch off. this is why i will probably wire it straight to the battery.

i was pretty pleased with this first attempt. ill test it at the weekend when i need to drive somewhere.





Attached Thumbnails
Click image for larger version

Name:	Dsc00730.jpg
Views:	139
Size:	43.4 KB
ID:	1639   Click image for larger version

Name:	Dsc00734.jpg
Views:	128
Size:	63.4 KB
ID:	1640   Click image for larger version

Name:	Dsc00729.jpg
Views:	123
Size:	59.0 KB
ID:	1641  
__________________
Nissan Leaf 24kwh. Average FE = 300mpg 3.6miles/kwh (@plug)

Last edited by modmonster; 09-01-2008 at 11:22 AM..
  Reply With Quote
The Following User Says Thank You to modmonster For This Useful Post:
redpoint5 (07-28-2012)
Old 09-01-2008, 11:35 AM   #23 (permalink)
Master EcoModder
 
Join Date: Jul 2008
Location: united kingdom
Posts: 262

Tracy - '00 vauxhall corsa
Thanks: 0
Thanked 11 Times in 4 Posts
that should be 4.5% saving in fuel @ 55mph according to that handy spread sheet i found on this site. -who posted that?

17% saving at 35mph. load didn't seem to change with speed.
__________________
Nissan Leaf 24kwh. Average FE = 300mpg 3.6miles/kwh (@plug)
  Reply With Quote
Old 09-04-2008, 07:32 PM   #24 (permalink)
Master EcoModder
 
Join Date: Jul 2008
Location: united kingdom
Posts: 262

Tracy - '00 vauxhall corsa
Thanks: 0
Thanked 11 Times in 4 Posts
ok ive installed it straight to the battery now so i should be able to EOC again. im doing some miles at the weekend so i should be able to test it then.
__________________
Nissan Leaf 24kwh. Average FE = 300mpg 3.6miles/kwh (@plug)
  Reply With Quote
The Following User Says Thank You to modmonster For This Useful Post:
teoman (02-04-2017)
Old 02-04-2017, 05:57 PM   #25 (permalink)
Master EcoModder
 
teoman's Avatar
 
Join Date: Jan 2017
Location: Istanbul
Posts: 1,245

A3 - '12 Audi A3
Thanks: 65
Thanked 225 Times in 186 Posts
How did this work out for you in the end?
  Reply With Quote
Old 02-04-2017, 11:03 PM   #26 (permalink)
Master EcoModder
 
oldtamiyaphile's Avatar
 
Join Date: May 2009
Location: Australia
Posts: 1,510

UFI - '12 Fiat 500 Twinair
Team Turbocharged!
90 day: 40.3 mpg (US)

Jeep - '05 Jeep Wrangler Renegade
90 day: 18.09 mpg (US)

R32 - '89 Nissan Skyline

STiG - '16 Renault Trafic 140dCi Energy
90 day: 30.12 mpg (US)

Prius - '05 Toyota Prius
Team Toyota
90 day: 50.25 mpg (US)

Premodded - '49 Ford Freighter
90 day: 13.48 mpg (US)

F-117 - '10 Proton Arena GLSi
Pickups
Mitsubishi
90 day: 37.82 mpg (US)

Ralica - '85 Toyota Celica ST
90 day: 25.23 mpg (US)

Sx4 - '07 Suzuki Sx4
90 day: 32.21 mpg (US)

F-117 (2) - '03 Citroen Xsara VTS
90 day: 30.06 mpg (US)
Thanks: 325
Thanked 452 Times in 319 Posts
I think people might be over estimating how much power is needed to turn a starter motor. Assuming your car starts nice and cleanly, the starter load is almost not worth considering.

My supercap bank has a miniscule 90mah capacity. I was able to get four consecutive starts out of it in my Suzuki Swift (I immediately shut down the engine upon firing each time so the alt didn't have time to energize).

That's 0.3Wh per start. So a 60Ah battery is good for around 216 starts, assuming no other loads The starter is a big instantaneous load, but even with hard core EOC and city traffic it's total duty cycle is only maybe 60 seconds a day. It's actually 'always on' things like the ventilation fan that creates the majority of electrical demand.

I average 16mph, that's only a fraction faster than a NYC taxi. Over my 20km commute, I need the starter motor about a dozen times. Most of the time I bump start.

__________________






  Reply With Quote
Reply  Post New Thread


Thread Tools


Similar Threads
Thread Thread Starter Forum Replies Last Post
Electric fifth wheel (DIY through the road parallel hybrid) friedlbug Hybrids 41 10-14-2019 10:22 PM
News: VW to unveil 70 mpg (US) Golf diesel hybrid MetroMPG Hybrids 27 06-29-2010 07:50 AM
Home Brew Challenge for Electric Geniuses (make a DIY electric motor controller) WaxyChicken Off-Topic Tech 42 08-19-2008 01:05 AM
Series Motor - Speed vs Torque TomEV Fossil Fuel Free 3 03-02-2008 12:27 PM
AC Induction Motor used as Brushless DC? WaxyChicken Fossil Fuel Free 5 01-29-2008 09:26 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