Mechanical vs. electrical/air locker - Defender Source
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  #1  
Old May 15th, 2012, 01:52 AM
CDeWan
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Clay DeWan
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Mechanical vs. electrical/air locker

Alright nother stupid question. I am currently running a detriot locker in the rear and a true track up front. I think I have taken about a 3mpg hit. Anyone else experience the same running mechanical locking diffs (I know it is clutch pack)....

On the flip side anyone notice any difference in mpgs running air/electical actuated lockers?
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  #2  
Old May 15th, 2012, 08:16 AM
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No you haven't. It is not possible.
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  #3  
Old May 15th, 2012, 09:08 AM
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Quote:
Originally Posted by CDeWan View Post
I think I have taken about a 3mpg hit.
Check your cats.
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  #4  
Old May 15th, 2012, 04:49 PM
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No you haven't. It is not possible.

Really? Why?
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  #5  
Old May 15th, 2012, 04:56 PM
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I run mine full locked all the time and my mpg goes up!
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  #6  
Old May 15th, 2012, 05:07 PM
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Quote:
Originally Posted by ini88 View Post
I run mine full locked all the time and my mpg goes up!
how do you go round corners?
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  #7  
Old May 16th, 2012, 10:09 PM
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Clay DeWan
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your right I am on crack

Quote:
Originally Posted by Red90 View Post
No you haven't. It is not possible.
Your right I don't check my odometer every time I fill up to keep track of my mileage. Silly me shouldn't have posted a question like that. O.k. so lest say at leat 2 and no more than 3 since I installed both and if your telling me that the a locker or a limited slip has less moving parts and less drag on the drive line then an open diff then apparently my differentials are talking to my speedo at the time of install and came up with a plan to F* with my mind.

Anyone else have a good comment on the mileage with an open diff compared to a more sophisticated one such as a locker or limted slip. I used to go 210 on a full tank after the conversion I am no about 180 per tank.
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  #8  
Old May 16th, 2012, 10:55 PM
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Did you change your pinyon/ring gear ratios when you put your lockers in? If not, I see no reason (in regards to lockers) for that to affect your mileage. Tune up time, air filter, cat's ?
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  #9  
Old May 17th, 2012, 12:04 AM
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Quote:
Originally Posted by leastonce View Post
how do you go round corners?
with lots of chirping and dog howling
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  #10  
Old May 17th, 2012, 12:21 AM
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Jack up 1 wheel. With the T-Case in neutral and the parking brake off, can you manually turn the raised wheel?

Easily?
Yes but difficult?
No?

If itís 1 then youíre on crack and should stop that as it will ruin your healthÖ J

If its 2 or 3 then that is your 'loss' because of the locker. It will result in increased tire scrub and extra effort required on the part of the engine when the wheels are travelling different distances such as in a corner or on uneven surfaces.

I would be surprised it's as much as you're seeing but not surprised that it's there.
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  #11  
Old May 17th, 2012, 02:21 AM
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Clay DeWan
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Ian,
I will try that but I imaging the result will be 2 or 3..Whiskey Tango Foxtrot I will give it a shot. I kept the same ratio 3:54 I believe as I used the same ring and pinion from the stock diffs. Just had it smogged and changed the plugs so ain't quite sure what is going on. I am sure there is a thread with what mileage folks are getting....anyway maybe I will move to a GM Gen4 conversion as there is a Defender Guru near me who is working on a plug and play with a 6 speed auto mated to it. He can get within about 1 inch of where the normal T case sits. Won't get diesel mileage but even with the 5.3L, 300HP would be nice.
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  #12  
Old May 17th, 2012, 08:33 AM
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Quote:
Originally Posted by CDeWan View Post
...and if your telling me that the a locker or a limited slip has less moving parts and less drag on the drive line then an open diff then apparently my differentials are talking to my speedo at the time of install and came up with a plan to F* with my mind...
The diffs have no drag on the drivetrain at all, no matter the brand or design and have zero effect on mileage, period. This is just a plain simple fact. If there was any drag at all the diffs would overheat and die very quickly.

The diff themselves act exactly the same in a straight line. Just the same two roller bearings spinning. There are no "other" moving parts.
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  #13  
Old May 17th, 2012, 09:23 AM
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The only only change was the lockers?

You've been keeping mpg data for the year or so prior to the change?

If the data is correct, then there has to be some major drag somewhere in your axle(s).. Id drive it for 15 mins or so around town and then get down there and feel for heat somewhere, which might lead you to the source of drag.
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  #14  
Old May 17th, 2012, 10:05 AM
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Could it be the change in the gas? Winter vs. summer fuel? Or the changes to 15% ethanol?
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  #15  
Old May 23rd, 2012, 05:24 AM
CDeWan
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Clay DeWan
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not sure as now I am at a loss. Thanks everyone for trying. back to my crack O..I mean Defender as I spend all my crack money on it.
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