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  #1  
Old 01-27-2014, 04:34 PM
ramman2012 ramman2012 is offline
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Default Interesting incidental - 1.5 MPG increase

All,

Hi, just joined this forum to share an interesting find with my 2012 Ram crew cab 4x4 Express truck. I am EE electrical by trade and a Ham radio operator and installed my gear into this truck. Noting that the altenator is a nice hefty 160 AMP size I wasnt worried about power although I am running a 500w 10 meter RF amplifier. On key downs at full power (45 AMP draw) I noticed especially at night the head lights flickering pretty bad. I run 6 gauge from the battery to the radio gear so no conceren there. This should'nt be happening. The issue has then got to be with under rated stock wiring. This is where I read about the "BIG THREE" wiring change under the hood. Big Audiofiles running mobile amps etc use this change to beef up power delivery. This is where it gets interesting.....I perform the BIG THREE by not removing but adding in parallel addtional 6 gauge battery cables to the stock small cables running from:

1. The (-) battery to fender ground.
2. The Battery (+) to fuse box feed.
3. Right front cylinder head engine (available threaded bolt) to left shock tower bolt(ie frame connection to engin block)
4. added cable from stock altenator (+) output to Battery (+) post following stock cable.
5. I also beefed up the stock (-) ground run straight run down form the (-) battery post to the frame behind the front left tire at frame.

Ok, so I made 5 changes but effectively still falls under the Big Three change rules to follow. You can google Big Three wiring change and see those basic rules to follow or implement.

All cables simply doubled up providing an effective 3 to 4 guage conenctions.

Now, not a bit of head light flicker, voltage maintianes 14.2v charging voltage at all times.

But here's what else has occured and what I wanted to share with you.

1. Slightly brighter headlights.

2. Engine starts are far quicker...no lag in starter (Same stock battery BTW) It's more of a snap start vs the ruh..ruh..start. Starter has better power feed even though I did not increase the starter cable feed size.

3. Here's the kicker...I am seeing 1.5 MPG average increase in fuel economy!! I actually had a tank on a long mostly freeway trip to Monterey a couple weeks back get me 18.2 MPG! Otherwise very same drive to work and back. This has to be due to increased power delivery to the ignition system and a stronger spark through those independent coils.

This addtional big three wiring done by yourself would cost you about $30.00 tops in cable and dual bolt lug battery lead clamps all available at your local auto store.

Just wanted to share this out. I have a photo of my install I need to find and will add it back here.

Happy camper! Best upgrade yet since making my move to 5w-20w mobile one synthetic. Smooth an quiet....

PJ
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Last edited by ramman2012; 01-27-2014 at 09:53 PM.
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  #2  
Old 01-27-2014, 05:13 PM
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joostan joostan is offline
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Wow...did Dodge really cheap us that much on copper wiring? You haven't changed plugs/coils recently? Different gas? I'd be curious to see if this increase remains over time.
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Old 01-27-2014, 05:26 PM
ramman2012 ramman2012 is offline
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Nope...same Safeway low grade unleaded gas, no changes other than turning to Mobile one synthetic..but that was long before this change when the truck rolled 12k miles...same drive aside from that mostly highway trip to Monterey ,CA. Obviously I bought gas at a couple differnt stations but always low grade unleaded. I am going to run a tank of Chevron premium next and see if it picks up more. I heard you can gain an additional ~1mpg running premium. BTW..just added photos above to original article.
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Old 01-27-2014, 05:43 PM
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finn5033 finn5033 is offline
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So can you forsee any issues this may cause? Could it end up frying the radio or EVIC or anything? Would this void warranty if anything did happen? I assume it woud if it can be traced to doing this?
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Old 01-27-2014, 05:56 PM
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spellingHi Finn5033,

I cannot speak for the dealer or warranties. All this does is beef up what is already in place. I have not added any new routes other than the additional ground from Engine block to frame rail. Your engine is mounted on rubber engine mounts and relies on a single small ground. There are many electrical devices floating on top of the engine. This mod only helps deliver full power under electrical load by bettering the power and ground paths by lowering inductance over the stock small power cables used. Since you bring this up...I of course assume no responsibility here although this Big three is nothing new....only that It was starkly noticed that the fuel economy after the last 5-6 tanks of same fuel made a jump after this change. If interested take article and photos above and consult your dealer. I'm sure they will say hog wash but...not true...not true...I can tell by engine starts and headlight brightness alone!

Last edited by ramman2012; 01-27-2014 at 06:07 PM. Reason: spelling error
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Old 01-27-2014, 06:07 PM
Red-Stripe Red-Stripe is offline
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Quote:
Originally Posted by ramman2012 View Post
All,

Hi, just joined this forum to share an interesting find with my 2012 Ram crew cab 4x4 Express truck. I am EE electrical by trade and a Ham radio operator and installed my gear into this truck. Noting that the altenator is a nice hefty 160 AMP size I wasnt worried about power although I am running a 500w 10 meter RF amplifier. On key downs at full power (45 AMP draw)PJ
Isn't the 10 meter class an an amature class restricted to 200 watts? You mention you have 500 watts amplifier draw on your truck.
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Old 01-27-2014, 06:12 PM
ramman2012 ramman2012 is offline
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Funny guy...typical Hammy stretching his arms.....Yes, 200W PEP maximum allowed on 10M unless your dumping it into a KW Cantenna dummy load for testing purposes. If I may correct you, I have a 45 amp draw at 500W PEP...yes. At least I see you are reading and paying attention. Now back to our previous Ram truck forum. Thanks for the nudge.
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Old 01-27-2014, 06:34 PM
TJC.geotech TJC.geotech is offline
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If you've changed the voltage in the system, it may have affected the reference voltage that some of the sensors use, and your increased fuel economy is a result of a measurement error.
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Old 01-27-2014, 06:56 PM
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That's kind of what I was thinking.
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Old 01-27-2014, 07:11 PM
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ramman2012, Do you go by the EVIC for mileage or X-amount of miles divided X-gallons used?
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