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Old 17-03-2020, 16:40   #1
Babylon6
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Quaife Diffs

Been thinking of fitting Quaife diffs front and/or rear on my 7 GT-A.

Any point or am I wasting money? Running about500 and going for 600 later this year.

Also, anything to watch out for? I know I might need to machine the front diff to fit.
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Old 21-03-2020, 20:03   #2
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Do you have a front Mitsubishi LSD fitted at the moment?
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Old 22-03-2020, 13:41   #3
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So my GT-A is running an ACD unit at the front, so I am presuming yes, it does have an LSD.
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Old 22-03-2020, 20:03   #4
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Quote:
Originally Posted by Babylon6 View Post
So my GT-A is running an ACD unit at the front, so I am presuming yes, it does have an LSD.
ACD is the centre LSD, not the front.

The front is a Torsen helical LSD, exactly the same as the Quaife. Replacing a Mitsubishi LSD with a Quaife is pointless and will gain you nothing. If you have an Open diff in the transfer box, just fit a second hand Mitsubishi LSD.

In regards to the rear diff, again, the AYC is better than a Quaife LSD. The AYC is an active diff, which helps reduce understeer and oversteer, a helical is just an analogue diff with the added downside in that it doesn’t work if an inside wheel is lifted.
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Old 23-03-2020, 20:18   #5
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Is there any way of easily knowing what front diff you have? Can you spin one front wheel whilst off the ground and the opposing wheel will spin in the same direction rather than opposite?
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Old 23-03-2020, 22:54   #6
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Is there any way of easily knowing what front diff you have? Can you spin one front wheel whilst off the ground and the opposing wheel will spin in the same direction rather than opposite?
Do you mean front or centre?
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Old 23-03-2020, 23:14   #7
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This video is not perfect but watching it thru slowly has helped me understand what is actually going on in different Transfer cases and how it affects the centre diff, front diff and torque distribution to the rear diff.

It also mentions some different options in the Transfer case inc ACD and Non-ACD (USA CTs).

It would be great if an evo expert live Clive had time to make proper videos for us covering CP too

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Old 24-03-2020, 08:30   #8
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I watched the same video, which was in part why I asked my original question. The other reason is a few people with GT-As running high power have changed out for wavetrac/Quaife/helical diffs. Prefer to know what the point is if I was to consider doing the same. Also going for a 2.3 stroker so not sure of how good stock is and whether I should upgrade.

Plus, both my centre and rear are knackered so I need to sort that out. A good point to replace anything that can improve things.
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Old 24-03-2020, 23:36   #9
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Quote:
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Do you mean front or centre?
The front diff.

I have ACD centre and an RS rear already due to having a GT. What I want to know is do I have an open or torsen front diff.
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Old 26-03-2020, 23:46   #10
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Isn't that deduced by looking through the shafts and if you have a lateral pin then its open? Last few minutes of the video above talks about it.
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Old 26-03-2020, 23:55   #11
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Originally Posted by Clivew View Post
The front is a Torsen helical LSD, exactly the same as the Quaife. Replacing a Mitsubishi LSD with a Quaife is pointless and will gain you nothing. If you have an Open diff in the transfer box, just fit a second hand Mitsubishi LSD.
what is worth doing on the transfer case? Was looking at Sheptrans site and seems to focus more on ring and pinion upgrades.
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Old 19-04-2020, 20:24   #12
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Quote:
Originally Posted by Clivew View Post
The front is a Torsen helical LSD, exactly the same as the Quaife. Replacing a Mitsubishi LSD with a Quaife is pointless and will gain you nothing. If you have an Open diff in the transfer box, just fit a second hand Mitsubishi LSD.
So I have an open diff in the front of my 7. Added complexity with mine being a GT-A, is the carrier shaft is machined to be slightly shorter to accomodate the auto gearbox (nearside drive shaft is longer that standard 7).

I want to go for some sort of LSD but all there seems to be out there are 8/9 units, which has a different carrier.
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Old 20-04-2020, 23:26   #13
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one of the best mods. Just do it. And since it is open do the 8mm to 10mm bolt upgrade.

p.s some use wavetracinstead of quaife. it is up to you. i chose quaife
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Old 21-04-2020, 09:23   #14
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O definitely am going to do it. Just as soon as I figure out what diff will fit my cone.

What’s involved in the 10mm bolt upgrade?
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Old 21-04-2020, 16:40   #15
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I think the 8-10mm upgrade is for a different age Evo
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