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Old 06-16-2012, 09:51 PM   #1
Breticus
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Default 168mm vs 188mm (Small vs Medium) case differentials?

What is the advantage of going with medium case over small case?
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Old 06-16-2012, 10:07 PM   #2
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Take a look at metricmechanic.com, lots of info on diffs. Just checked out their new site, dig a little, there is ton of good info across the board and there are alot of very helpful forum members.

Last edited by Noneone2; 06-16-2012 at 10:12 PM. Reason: info
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Old 06-16-2012, 10:23 PM   #3
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Quote:
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What is the advantage of going with medium case over small case?
Different ratios, better fuel economy OR better acceleration. Medium cases are built a little beefier, handle more power good if you plan on doing an engine swap or going FI.
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Old 06-16-2012, 10:24 PM   #4
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Ahhh I see. So all I would need for one of those is the new differential and some E30 CV axles?
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Old 06-16-2012, 10:26 PM   #5
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And shim the rear ABS sensors.
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Old 06-16-2012, 10:30 PM   #6
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Does the '95 have ABS sensors?
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Old 06-16-2012, 10:34 PM   #7
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Does the '95 have ABS sensors?
Yes.
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Old 06-16-2012, 10:35 PM   #8
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So what do you guys mean by shim? Just grind down?
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Old 06-16-2012, 10:36 PM   #9
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The reason they need to be shimmed is because the e30 halfshafts have larger diameter ABS tone rings. The teeth on the tone rings pass by the ABS sensors which are magnetic and generate a pulse. It works exactly the same way the speed and cam sensors work. If you don't shim the ABS sensors, the ABS tone rings will rub and destroy the sensors. All you need is a washer with a 5/8" hole to raise the sensors about 1/8th of an inch.

Last edited by cooljess76; 06-16-2012 at 11:05 PM.
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Old 06-16-2012, 10:40 PM   #10
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Quote:
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So what do you guys mean by shim? Just grind down?
http://www.318ti.org/forum/showpost....9&postcount=75

btw, you probably don't have to cut them like I did, just drill a hole where the bolts go through.

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Old 06-16-2012, 10:47 PM   #11
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And they still work?
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Old 06-16-2012, 11:03 PM   #12
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Quote:
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And they still work?
Not sure I understand what you mean, but yeah they still work.



See the "toothed" ring on the axle? That's the ABS tone ring. It's larger than the one on the 318ti axle. Therefore, if you force it into the trailing arm, it will destroy the ABS sensors if they're not shimmed. The sensors mount in a hole on the trailing arms and the magnets ride about 1/32nd of an inch above the tone rings.

Last edited by cooljess76; 06-17-2012 at 12:22 AM.
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Old 06-16-2012, 11:07 PM   #13
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Quote:
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So what do you guys mean by shim? Just grind down?
Just to clarify, you DO NOT grind the sensors. You want to do the exact opposite and raise them. That's what shim means.
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Old 06-16-2012, 11:21 PM   #14
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AHH! So I just need a spacer of sorts? I can do that. Just a decent sized washer?
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Old 06-16-2012, 11:29 PM   #15
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This may sound stupid, but I don't need a left and a right cv axle do I? You just buy 2 and flip the other one around?
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