Pezza
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 posted on 13/6/06 at 03:43 PM |
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Diff ratio
Trying to find out the ratio of the diff that came with my part built car.
It doesn't have the normal little tag on it, think the chap lost it when he cleaned it up, but it does havve the following on the casing
83BG-4033BA
and below it and offfset III/1
any ideas? he thought he remembered it as being a 3.58 but I can't see that ratio listed anywhere.
Cheers
Ben
You couldn't pwn your way out of a wet paper bag, with "PWN ME!!" written on it, from the "pwned take-away" which originally contained one
portion of chicken tikka pwnsala and the obligatory free pwnpadom.
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chockymonster
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| posted on 13/6/06 at 03:47 PM |
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The number on the casing is just the part number for the casing.
2 options,
1st is to rotate the input shaft and count the number of turns it takes rotate a point on the drive shaft one complete revolution.
2nd is to take the back plate off as the ratio is normally written on the crownwheel.
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Pezza
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| posted on 13/6/06 at 04:02 PM |
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cheers i'll go try the turning trick now 
You couldn't pwn your way out of a wet paper bag, with "PWN ME!!" written on it, from the "pwned take-away" which originally contained one
portion of chicken tikka pwnsala and the obligatory free pwnpadom.
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jimgiblett
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| posted on 13/6/06 at 05:01 PM |
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My understanding IIRC. Is that if the diff is non LSD (ie open) the outputs will turn in opposite directions when you turn the input. To overcome
this hold one output stationary and the input should turn at half the ratio thus for a 3.62 diff only 1.81 turns of the input will be require to turn
the free output by one revolution.
HTH
- Jim
quote:
Originally posted by chockymonster
The number on the casing is just the part number for the casing.
2 options,
1st is to rotate the input shaft and count the number of turns it takes rotate a point on the drive shaft one complete revolution.
2nd is to take the back plate off as the ratio is normally written on the crownwheel.
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Liam
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| posted on 13/6/06 at 05:20 PM |
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The outputs wont turn opposite directions (you're mistaking the situation for when you turn one output and the other turns in the opposite
direction leaving the input still). Friction in the spider gears should be enough to prevent them moving in this situation and keep both outputs at
the same speed. However if one output is a bit stiff it may go slower than the other and throw your ratio calc out. Just keep an eye on your flanges
- if they dont move together at the same speed then jimgiblett's method will ensure accuracy.
Liam
[Edited on 13/6/06 by Liam]
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Pezza
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| posted on 13/6/06 at 06:14 PM |
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I got my old man to hold the offside shaft while I turned the input bit, got about 1.8 turns to 1 so I presume it's a 3.62
cheers chaps 
You couldn't pwn your way out of a wet paper bag, with "PWN ME!!" written on it, from the "pwned take-away" which originally contained one
portion of chicken tikka pwnsala and the obligatory free pwnpadom.
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