Andrzejsr
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| posted on 31/10/22 at 09:59 AM |
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Visco vs helical differential
I am looking for a opinions and others experience regarding driving type-7 car with Visco-LSD differential and Helical - TorSen differential.
Are there easy to feel / experience differences between both ? In road driving and occasionaly tempting to make rear of the car more
'lively' .
It is for road car with not tuned Zetec 2.0 , not for a track one.
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snapper
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| posted on 31/10/22 at 02:04 PM |
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I run a Quaife ATB (helical/Torsen) diff, you cannot feel it in normal road driving but I do notice it when going hard into a roundabout, there is a
moment when the rear feels loose (weightless) then it grips and pulls well out of the roundabout.
I believe that the Ford viscous diff has a very mild LSD effect and was designed for the much heavier Sierra but is the cheapest way to get an LSD in
to your car.
Plate (or clutch diffs) need the diff setting up for your particular use unlike a viscous or Torsen diff
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pewe
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| posted on 31/10/22 at 03:49 PM |
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On the hairdresser's I have a Torsen.
It gives very positive drive especially out of tight corners.
The only problem is it makes a god-awful clanking noise if you try and use it on a skid pan.
Interestingly a mate's Nissan Z also sounded terrible on the same pan.
The 5 owners with viscous diffs report they aren't as long lasting as mechanical diffs - worth bearing in mind if you're buying
second-hand,
I don't know the specific reasons for that but i assume either Youtube or one of the many MX5 forums can tell you.
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Andrzejsr
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| posted on 31/10/22 at 06:32 PM |
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Yes in the case of visco need to be sure it was taken from a car where it was really working nice ( by chance have such opurtinity from a sierra with
30 000 km years ago and landed on the shelf, but with 3,62 ratiio , need to open, inspect etc to put my current 3,92 ratio from open one). Or be
prepared to change the grease/silicone or what it is inside between plates.
Also talked to a man who have some experience with Sierras, says that this grease can become hard as stone and destroy diff including .
By the way my current open (that was described when I was buing it) diff is strange behaving - when rear wheels up, and I turn left wheel , right
wheel tuns in the same direction . I thought that is the behaviour of LSD diffs ? also when turning driveshaft with those wheels up both turn in one
direction.
If other person keeps one wheel stedy , I can quilt lightly turn the other wheel (again both rear wheels in the air)/ I am little confused. One person
I talked to who had few Sierras, told my I might have a LSD but with heavily degraded grease. But not likely, as I was buing it from a company who
rather knows technical aspetcs and in price of open diff rather than (even in the need of changing a grease) LSD ( Plyskool , yes, I heard of the
end, but cant think they dont know if its open or dead LSD. In the end will need to look inside .
One more I thoughtm, maybe there are some risistance inside the diff (bearing or sth) that mimics some traction grip even when wheels up so diff
"thinks" both tyres have grip so both turn one direction?
In the car , driving, trying to take a turn more "spirited way" its not behaving how I suppouse LSD should.
So anyway during winter need to take it out., Just thinking which way to go visco or helical. That behavior of helical "engaging" I
suppouse is not observed in Visco ? for road car that plus for visco I think .
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pewe
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| posted on 1/11/22 at 10:46 AM |
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quote:
Originally posted by Andrzejsr
So anyway during winter need to take it out., Just thinking which way to go visco or helical. That behavior of helical "engaging" I
suppouse is not observed in Visco ? for road car that plus for visco I think .
TBH the only time I've been aware of the Torsen engaging has been on the skid pan - otherwise it locks up smoothly - so much fun on tight uphill
hairpins as you plant your right foot on the apex and rocket up the hill - oh yes! 
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Andrzejsr
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| posted on 1/11/22 at 04:23 PM |
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Ok, now understrand.
Wonder if there are users of Blackline Traction Torsen diffs ?
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