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Old 01-07-2003, 08:38 PM   #1
Corn-Picker
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Question Different types of differentials

I noticed that the STi is advertised as having a "mechanical rear limited slip differential" and the normal WRX has a "viscous rear limited slip differential." What's the difference? I'm guessing the mecanichal one is better and transfers power more quickly when a wheel slip occurs
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Old 01-07-2003, 08:40 PM   #2
ciper
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http://forums.nasioc.com/forums/show...hreadid=297873

similar question

Im guessing the rear in the STI is the same we seen in the current WRX while the front is some type of torsen.
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Old 01-07-2003, 08:52 PM   #3
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From what I read, the front one does not use gears and is electronically controlled. So it can't be torsen. The rear one might be torsen like because Torsen is pure mechanical.
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Old 01-07-2003, 09:20 PM   #4
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front diff is a suretrack diff, made by AP racing. Check AP racings website. Rear diff is mechanical rather than viscous, basically in non techy speak its a more violent lockup but gives more traction (still looking for a body shop to invest in ) The centre diff is an electromagnetically controlled mechanical diff giving anything from 65/35 R/F torque split upto 50/50 fully locked.
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Old 01-07-2003, 09:55 PM   #5
ciper
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I always beleived that mechanical meant in contrast to electronic, so in this sense a viscous unit would be mechanical right?

I went to AP Racings site and found no info of the lsd, only brakes and such. I searched the web and found gearboxes with this LSD installed but no information on its function.

Can you help me to find the information?
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Old 01-07-2003, 10:16 PM   #6
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My guess is that it will have a clutch type rear diff
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Old 01-07-2003, 11:36 PM   #7
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coming from a 4wd background, a viscous LSD means that there's a fluid inside the diff, what when slippage occurs, the fluid heats up and become more solid so the gears inside will act like a closed diff. not 100% lockup like a spool or my ARB air locker.

on my truck, i have a detroit true-trac LSD (front axle has the TT while the rear has ARB) that uses helical gears to get the 2 sides to work as one.

check out tractech's pdf about the tru-trac. they also list a sure-trac diff too.

http://tractech.com/Products.htm
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Old 01-08-2003, 01:15 AM   #8
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Quote:
Originally posted by johnfelstead
front diff is a suretrack diff, made by AP racing. Check AP racings website. Rear diff is mechanical rather than viscous, basically in non techy speak its a more violent lockup but gives more traction (still looking for a body shop to invest in ) The centre diff is an electromagnetically controlled mechanical diff giving anything from 65/35 R/F torque split upto 50/50 fully locked.
Are any of you guys finally jealous of us?

Seriously, while your educating us on drivetrain stuff, would a 2.5 litre engine be likely to use different gear ratios in the transmission? also for the differentials?
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