Post Reply 
 
Thread Rating:
  • 0 Votes - 0 Average
  • 1
  • 2
  • 3
  • 4
  • 5
ALTERNATOR DRAG HOW MUCH HP DRAIN?
Author Message
hygear Offline
Member
***

Posts: 242
Joined: Aug 2008
Reputation: 1
Post: #1
ALTERNATOR DRAG HOW MUCH HP DRAIN?
There has been debates on just how much your cell can affect your mileage gains from amp draw.Now here's a formula to calculate how much horsepower you're losing.This is not my quote,but a formula from a racing site!!!!!!!!!

How much horsepower does an alternator pull ? You can mathematically determine the horsepower cost at any given load. (Remember, alternators respond to load. If there is no load present the alternator is basically freewheeling.)


Amps x Volts = Watts
Watts / 745.7 (one HP) = Electrical HP Produced by the Alternator
HP x 15% Efficiency Loss = HP Loss
HP + HP Loss = Total HP Used


Example:
57A x 14.9V = 849.3 Watts
849.3 Watts / 745.7 = 1.14 HP
1.14 HP x 15% = 0.17 HP
1.14 + 0.17 = 1.31 HP Total

Now we know the cost to run the electrical system. The most important question is what is the payback ? Which way does the horsepower benefit you ?

2005 Dodge Ram 1500 Quadcab 4x4 5.7 hemi
09-19-2008 10:33 AM
Find all posts by this user Quote this message in a reply
realtyroy Offline
Member
***

Posts: 158
Joined: Sep 2008
Reputation: 0
Post: #2
RE: ALTERNATOR DRAG HOW MUCH HP DRAIN?
That's very interesting, I would have thought it would have taken more HP from the engine than that.

Roy

RealtyRoy-HHO Scambuster
http://pmgen.com/hhoscambusters/

2002 Dodge Durango SLT 4.7
2001 Audi A6 2.8 Quattro
1964 Chev Impala SS 409 My baby!

A day is a day but the day I save gas is a good day!!
09-19-2008 01:30 PM
Find all posts by this user Quote this message in a reply
hygear Offline
Member
***

Posts: 242
Joined: Aug 2008
Reputation: 1
Post: #3
RE: ALTERNATOR DRAG HOW MUCH HP DRAIN?
realtyroy Wrote:That's very interesting, I would have thought it would have taken more HP from the engine than that.

Roy


I agree,it's much different than what I've been told about how it can affect mileage gains.I've got 345 horses to play with and I doubt 1 or 2 or less will be missed AFAIK.

2005 Dodge Ram 1500 Quadcab 4x4 5.7 hemi
(This post was last modified: 09-19-2008 02:18 PM by hygear.)
09-19-2008 02:16 PM
Find all posts by this user Quote this message in a reply
JonnyBravo Offline
Member
***

Posts: 62
Joined: Jul 2008
Reputation: 0
Post: #4
RE: ALTERNATOR DRAG HOW MUCH HP DRAIN?
Glad to see someone took the time to explain the relation between electrical load and load on the engine. For some reason, many people think 30A is a significant load on the engine, or that alternators have significant drag, even with no load present. Smile

'94 Ford Explorer 4.0L - Fargo, ND
09-19-2008 05:20 PM
Find all posts by this user Quote this message in a reply
hydrotinkerer Offline
Member
***

Posts: 367
Joined: Aug 2008
Reputation: 0
Post: #5
RE: ALTERNATOR DRAG HOW MUCH HP DRAIN?
Interesting, Very interesting. I learned something today.
09-19-2008 06:49 PM
Find all posts by this user Quote this message in a reply
rudagray Offline
Collaboration is the Key to Success!
***

Posts: 308
Joined: Jul 2008
Reputation: 1
Post: #6
RE: ALTERNATOR DRAG HOW MUCH HP DRAIN?
So should we just all add a secondary Alternator to run the HHO? and if at ~60A as the example above we only lose 1.3HP...

I must be missing something Smile Crazy

Always remember there is a fine line between genius and insanity, so don't cross it.
Wile E. Coyote never learned and he was a SUPER GENIUS! Roadrunner made him insane.
If all great minds thought alike, we'd get nowhere, the differences can make us all prosper.
10-02-2008 10:26 AM
Find all posts by this user Quote this message in a reply
Verdfrepler Offline
Member
***

Posts: 11
Joined: Sep 2014
Reputation: 0
Post: #7
RE: ALTERNATOR DRAG HOW MUCH HP DRAIN?
A great exchange of information.

dubli
09-09-2014 05:23 AM
Find all posts by this user Quote this message in a reply
Post Reply 


Forum Jump:


User(s) browsing this thread: 1 Guest(s)