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Old 27th February 2012, 21:31   #1
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Default MM540 2WD to 4WD - Mileage drop after conversion

Hi Guys,

I recently got my 2wd mm540 to a 4wd, although everything is running smoothly, there is a huge drop in mileage and has become a cause for concern. But it is a very capable off-roader, but the mileage stinks!

Before in the 2wd I used to get somewhere around 12-13 Kmpl. But now after the conversion to a 4wd. I don't think its giving me even 8kmpl roughly!

I spoke to my mechanic and he insisted that we get the diesel pump serviced, But even after so, the problem is still the same!

My thoughts are, is there something that has to do with the crown pinion ratio? It has the original 540 diffs and crown pinons.

I am aware that the The Tcase and the front differential will add another 70+ Kilo weight on the jeep.. But I dont think that would make a huge difference though? or does it?

I haven't installed lamda though! will this help?

Any thoughts on this gurus?
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Old 28th February 2012, 10:25   #2
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Default Re: MM540 2WD to 4WD - Mileage drop after conversion

Quote:
Originally Posted by yamaniac View Post
Hi Guys,

I recently got my 2wd mm540 to a 4wd, although everything is running smoothly, there is a huge drop in mileage and has become a cause for concern. But it is a very capable off-roader, but the mileage stinks!

Before in the 2wd I used to get somewhere around 12-13 Kmpl. But now after the conversion to a 4wd. I don't think its giving me even 8kmpl roughly!

I spoke to my mechanic and he insisted that we get the diesel pump serviced, But even after so, the problem is still the same!

My thoughts are, is there something that has to do with the crown pinion ratio? It has the original 540 diffs and crown pinons.

I am aware that the The Tcase and the front differential will add another 70+ Kilo weight on the jeep.. But I dont think that would make a huge difference though? or does it?

I haven't installed lamda though! will this help?

Any thoughts on this gurus?
Hi Yamaniac,

Please check the following

1) Front & Rear Brakes are binding.

2) Change the Front Axle Flange to Free Wheeling Hub.

3) Check the Front & Rear Differential Ratio

4) Rear Prop Shaft Alignment

Regards,

Arka

PS - Post a few pics of the front and rear Diff, under the chassis.
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Old 28th February 2012, 10:50   #3
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Default Re: MM540 2WD to 4WD - Mileage drop after conversion

With the added 4WD you should experience a drop of about 2Kmpl more or less, on account of the increased weight and the fiddly bits added in.
More than that is strange.
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Old 28th February 2012, 12:22   #4
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Default Re: MM540 2WD to 4WD - Mileage drop after conversion

Quote:
Originally Posted by yamaniac View Post
But now after the conversion to a 4wd. I don't think its giving me even 8kmpl roughly!
In my limited knowledge:

Get a free wheeling hub. It frees the front axle and differential, and should get you back the 2WD mileage.

Also, have you retained the left aligned rear differential?. If so, I guess with a T-18 TC, (IIRC, you got that?) The prop shaft will be angled and be far from efficient.

So, please get a right aligned rear differential (If not done).

Other than that, unless the work is shoddily done, I dont see a reason for the drop in mileage.
Quote:
I haven't installed lamda though! will this help?
Yes, please..

Last edited by dhanushs : 28th February 2012 at 12:29.
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Old 28th February 2012, 21:52   #5
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Default Re: MM540 2WD to 4WD - Mileage drop after conversion

Hi,
Simple things first. Is the speedo/ odo showing correct readings?

Regards
Sutripta
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Old 28th February 2012, 22:51   #6
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Default Re: MM540 2WD to 4WD - Mileage drop after conversion

Hi yamaniac,

I observed 2 to 3 Kmpl of drop in mileage after 4WD conversion.
I have FWH installed.

HJ13
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Old 29th February 2012, 18:22   #7
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Default Re: MM540 2WD to 4WD - Mileage drop after conversion

I did Ahmedabad-Lonavala-EXAMM-Karjat-Ahmedabad in 2010 with my DP-engined 540 and I got an average of 13.5 for the entire trip which included expressways (lol in a jeep!) and offroad (jungle slush trails). And my Jeep is 4wd with FWH!

Freewheeling hubs is the way to go! Fix them up and then see if you still don't see reasonable performance improvement then it can be other things.

Cheers,
Adi
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Old 29th February 2012, 20:02   #8
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Default Re: MM540 2WD to 4WD - Mileage drop after conversion

Thanks alot for the input guys!

Hi Arka,

I Will post a few pics soon, I am currently in the UK right now on some work, will post it by the end of this week. Thank you so much!

Quote:
Originally Posted by ex670c View Post
Hi Yamaniac...

...under the chassis.
Quote:
Originally Posted by shankar.balan View Post
With the added 4WD you should experience a drop of about 2Kmpl more or less, on account of the increased weight and the fiddly bits added in.
More than that is strange.
Quote:
Originally Posted by dhanushs View Post
In my limited knowledge...

...I dont see a reason for the drop in mileage.
Yes, please..
Quote:
Originally Posted by Sutripta View Post
Hi,
Simple things first. Is the speedo/ odo showing correct readings?

Regards
Sutripta
Quote:
Originally Posted by HJ13 View Post
Hi yamaniac,

I observed 2 to 3 Kmpl of drop in mileage after 4WD conversion.
I have FWH installed.

HJ13
Quote:
Originally Posted by AVR View Post
I did Ahmedabad-Lonavala...

...Cheers,
Adi

Last edited by suhaas307 : 29th February 2012 at 23:03. Reason: Please avoid quoting large posts as it may inconvenience small-screen and mobile users. Thanks :)
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