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Old 9th April 2010, 19:30   #16
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Originally Posted by Tejas@perioimpl View Post
Good project! Where are you getting it done?

I don't think the low bonnet will be able to house the XD3P. You will need to go for a high bonnet.

EDIT:

What dif ratio are you using? For 31" tyres you will need to go for 5.38 or you will loose power / torque during OTRs.
nope ,as i said i have seen a low bonnet with the xdp3 which he made earlier.

I am getting it done at a place owned by a punjabi guy called Rajeev Dham.
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Old 9th April 2010, 19:47   #17
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Originally Posted by garrett_t16 View Post
please explain the point which @tejas said about loosing power of torque during otr's.
The difs can be 5.38, 4.88, 4.22, etc

5.38 gives max torque and lower speed.
4.22 gives less torque and more speed comparatively.

Now, your 4.88 is a perfect compromise for speed and torque. However, this suitable for the OE 215/75/15 tyres which are approx 29.5" in diameter.
Thus, for every rotation of your tyre, your axle moves 4.88 times. Or you can say that your axle needs to rotate 4.88 times to move your tyre by one revolution.
Your 31" tyres now will cover more ground per revolution. Thus you will get more on-road speed. But, when you come to off road terrain, you will loose power since they axle has to work more to rotate the tyre and also the 31" tyre is very heavy.

Thus, to come back to the same efficiency as the original 4.88, when you put 31" tyres, you have to change your dif to 5.38.

Hope this is clear.

EDIT:
Where is Rajiv Dham's workshop in bombay?

Last edited by Tejas@perioimpl : 9th April 2010 at 19:48. Reason: see edit
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Old 9th April 2010, 19:58   #18
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Quote:
Originally Posted by Tejas@perioimpl View Post
The difs can be 5.38, 4.88, 4.22, etc

5.38 gives max torque and lower speed.
4.22 gives less torque and more speed comparatively.
Tejas, which 4.22 axle are you talking about? I presume it is 4.27, typo?
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Old 9th April 2010, 20:00   #19
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Originally Posted by SPIKE ARRESTOR View Post
Tejas, which 4.22 axle are you talking about? I presume it is 4.27, typo?
Sorry yes typo... Hope my other info is correct!

See you soon!
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Old 9th April 2010, 21:07   #20
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Quote:
Originally Posted by Tejas@perioimpl View Post
The difs can be 5.38, 4.88, 4.22, etc

5.38 gives max torque and lower speed.
4.22 gives less torque and more speed comparatively.

Now, your 4.88 is a perfect compromise for speed and torque. However, this suitable for the OE 215/75/15 tyres which are approx 29.5" in diameter.
Thus, for every rotation of your tyre, your axle moves 4.88 times. Or you can say that your axle needs to rotate 4.88 times to move your tyre by one revolution.
Your 31" tyres now will cover more ground per revolution. Thus you will get more on-road speed. But, when you come to off road terrain, you will loose power since they axle has to work more to rotate the tyre and also the 31" tyre is very heavy.

Thus, to come back to the same efficiency as the original 4.88, when you put 31" tyres, you have to change your dif to 5.38.

Hope this is clear.

EDIT:
Where is Rajiv Dham's workshop in bombay?
thanks Tejas,
i get the point now but what i think is that if the classic works fine on and off the road with the 4.88,and 29.5'' tyres than the bigger,more powerful engine should balance out the effect with 31'' tyres. RIGHT ?

guys im a newbie at jeeps so please answer my stupid questions as i think over everything practically so help me out.

and now that the diffs delivery is taken and they are already in place i dont think there is much we can do , till what extent will this affect my jeeps off-road capability , i mean it wont be a sitting duck right?

and ya RAJIV has his workshop midway between goregaon/malad, mumbai.

Last edited by garrett_t16 : 9th April 2010 at 21:09.
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Old 9th April 2010, 21:50   #21
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and ya RAJIV has his workshop midway between goregaon/malad, mumbai.
Congrats man. would love to drop by and check your jeep out some day
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Old 9th April 2010, 21:50   #22
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Garrett

Firstly congrats on getting your own JEEP.. and becoming a Jeeper.

This is a daring and very very interesting project. Many a people (Read ME!) will hesitate taking up such a project for the fear of reliability. Hope you have found a real good mechanic.

Wish you all the best and i for sure will be following this thread closely.

Cheers

Nishanth
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Old 9th April 2010, 21:56   #23
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Congrats man. would love to drop by and check your jeep out some day
sure man .you are most welcome to drop by.
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Old 9th April 2010, 22:02   #24
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Fascinating project! I wish you the best in making your Jeep a real 1-off
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Old 9th April 2010, 22:04   #25
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Originally Posted by hgnishanth View Post
Garrett

Firstly congrats on getting your own JEEP.. and becoming a Jeeper.

This is a daring and very very interesting project. Many a people (Read ME!) will hesitate taking up such a project for the fear of reliability. Hope you have found a real good mechanic.

Wish you all the best and i for sure will be following this thread closely.

Cheers

Nishanth
thanks man ,
the only thing was i wanted to do things my way .ground up, i did not want to take a used jeep and restore it,and dont worry i know some pretty good mechanics especially for diesels as I have some pretty massive diesel engines in most of my civil equipments
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Old 9th April 2010, 22:31   #26
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Originally Posted by garrett_t16 View Post

i am going for a plain look just black ,no stickers,no ropes,nothing saying 'turbo' or 'power steering'
Even I like the completely plain black jeep that I luckily found when I bought one...the ropes and like Tejas and I talked earlier on JT, the red handled shovels can be surely avoided! Though IMHO, the low bonnet looks go best with the old-school NDMS tyres and not radials especially 31"ones

Quote:
Originally Posted by garrett_t16 View Post
thanks man ,
the only thing was i wanted to do things my way .ground up, i did not want to take a used jeep and restore it,and dont worry i know some pretty good mechanics especially for diesels as I have some pretty massive diesel engines in most of my civil equipments
Fortunately or unfortunately I ended up buying a jeep where I didn't have to do much except the 4wd conversion which is in process. Someday I'd love to do up a jeep from ground up. Actually saw a few old govt 4x4 scrapped 540s and still get tempted!

On the diff ratios, I've also been told to get the 9/44 ratios i.e. 4.88. How does this combination work with the 2112 Peugeot?

Good going man and all the best!

Cheers,
Adi
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Old 9th April 2010, 22:42   #27
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as AVR said, the 4.88 diff ratios can also be called 9/44.
so similarly what can the 4.27 & 5.38 be called ?
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Old 9th April 2010, 23:32   #28
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Dear Garrett T16 - 4.27 is 47/11 and 5.38 is 43/8.

Best of luck. You'll need it!

Best regards,

Behram Dhabhar
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Old 10th April 2010, 00:27   #29
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Dear Garrett T16 - 4.27 is 47/11 and 5.38 is 43/8.

Best of luck. You'll need it!

Best regards,

Behram Dhabhar
Mr. Behram,

What were the standard ratios that 540DP came with? My mechanic told me 8/37. Is that true?

Adi
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Old 10th April 2010, 01:08   #30
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Dear AVR - MM540 came with 5.38:1. MM540 / MM550 with XD3P engine came with 4.88:1. Even today, Bolero SLX 4 wheel drive comes with 4.88:1 only.

You recently purchased a 2 wheel drive MM540 in Ahmedabad? If yes, you have to do a lot of work on your vehicle. Please PM me. I will guide you in totality.

Best regards,

Behram Dhabhar
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