Posi-Traction Rear?
07-25-2002, 08:00 PM
#1
Registered User
Thread Starter
Join Date: Jul 2002
Posts: 266
Posi-Traction Rear?
I'm new to these Camaros =) I have a 2002 Camaro SS. Is the rear end posi-trac? Or what? I'm not even 100% familiar what that means, but someone asked me today - claimed he had a 98 Z28 that was, and I didnt know...
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-2002 Red Camaro SS
Chesapeake, Virginia
http://www.HeadRushPerformance.Com
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-2002 Red Camaro SS
Chesapeake, Virginia
http://www.HeadRushPerformance.Com
07-25-2002, 08:18 PM
#2
Registered User
Join Date: Nov 2000
Location: Charleston,SC
Posts: 747
Posi traction or LSD as you'll sometimes hear it called is basically the same thing.There is a minor difference but for now it works like this:
-When you step on the gas both rear wheels turn.Where as with an open rear end only one tire turns.
Hope that helped.There is an entire technical speil that I'm not 100% sure about but that's the basic concept.Good luck.
Kevin
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1998 Black Z28 A4
-------1/8-------
8.584 @ 83.64 MPH
Taylor 10.4mm wires,!EGR,!FRA,SLP Lid,MAF Ends,IAT Tricker,TB Bypass,Manual Fan Switch,and Dynomax Cat-back
BMR STB and Sub-frame Connectors
Pics
-When you step on the gas both rear wheels turn.Where as with an open rear end only one tire turns.
Hope that helped.There is an entire technical speil that I'm not 100% sure about but that's the basic concept.Good luck.
Kevin
------------------
1998 Black Z28 A4
-------1/8-------
8.584 @ 83.64 MPH
Taylor 10.4mm wires,!EGR,!FRA,SLP Lid,MAF Ends,IAT Tricker,TB Bypass,Manual Fan Switch,and Dynomax Cat-back
BMR STB and Sub-frame Connectors
Pics
07-25-2002, 10:36 PM
#3
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Join Date: Jan 2002
Location: Oshawa - Home of the 5th-gen
Posts: 5,308
Posi-traction / Posi-trac / "Posi" / LSD - Limited Slip Differential / whatever you want to call it --- here's what happens:
inside the differential, the posi unit uses a set of springs and a clutch pack to stop the spider gears from turning, which in essence "locks" the rear axles, so that when the drive shaft turns the main ring gear, both axles will turn together as if they're one. If the rear end were an open type, both wheels will still turn, but if one tire was on pavement, and the other was on ice (for example), then the tire on ice would spin free, since there is no friction on that side, but the tire on the pavement would not move, therefore, the car would go nowhere. If a car with posi was put in the same situation, both wheels would want to turn, so even though one is on ice, the one on the pavement would still turn, and your car would move.
The benefit of a posi rear end is that, in a race or at the track, if one tire cannot get the same traction as the other, it will not allow that one wheel to start spinning and let the other one slow down --- both wheels are forced to turn at the same speed. HOWEVER, the posi does allow the axles to turn at different speeds if one wheel becomes lodged (ie: in off-roading situations), or while going around a corner (one wheel is allowed to slow down so that your rear tires don't squeal so bad going around the turn). If the car had a solid axle, it could or would snap in those situations, so the posi allows some of the differential function, without sacrificing straight line traction.
That's a little better explaination for ya!
BTW: all Z28's and T/A's (and SS's/WS6's) have LSD's.
------------------
2002 Z28 - A4, 2.73's, Blk/blk, leather, T-tops, sport appearance package - just bought on June 26, 2002! - Pics
1981 Z28 - 383, TH350 trans., 3.42 posi - sold August, 2000 - Pics
1973 Camaro - Dad's & my project in the works - to be built: 355 Chevy, 11.5:1 pop-ups, "camel hump" heads (w/2.02 valves), solid cam, 4-speed.....it should be quick! - No Pics yet.
inside the differential, the posi unit uses a set of springs and a clutch pack to stop the spider gears from turning, which in essence "locks" the rear axles, so that when the drive shaft turns the main ring gear, both axles will turn together as if they're one. If the rear end were an open type, both wheels will still turn, but if one tire was on pavement, and the other was on ice (for example), then the tire on ice would spin free, since there is no friction on that side, but the tire on the pavement would not move, therefore, the car would go nowhere. If a car with posi was put in the same situation, both wheels would want to turn, so even though one is on ice, the one on the pavement would still turn, and your car would move.
The benefit of a posi rear end is that, in a race or at the track, if one tire cannot get the same traction as the other, it will not allow that one wheel to start spinning and let the other one slow down --- both wheels are forced to turn at the same speed. HOWEVER, the posi does allow the axles to turn at different speeds if one wheel becomes lodged (ie: in off-roading situations), or while going around a corner (one wheel is allowed to slow down so that your rear tires don't squeal so bad going around the turn). If the car had a solid axle, it could or would snap in those situations, so the posi allows some of the differential function, without sacrificing straight line traction.
That's a little better explaination for ya!
BTW: all Z28's and T/A's (and SS's/WS6's) have LSD's.
------------------
2002 Z28 - A4, 2.73's, Blk/blk, leather, T-tops, sport appearance package - just bought on June 26, 2002! - Pics
1981 Z28 - 383, TH350 trans., 3.42 posi - sold August, 2000 - Pics
1973 Camaro - Dad's & my project in the works - to be built: 355 Chevy, 11.5:1 pop-ups, "camel hump" heads (w/2.02 valves), solid cam, 4-speed.....it should be quick! - No Pics yet.
that was the short answer!? 
Do you want the long answer?? 
07-26-2002, 03:36 AM
#6
Registered User
Join Date: Oct 2001
Location: Corpus Christi, Texas, US
Posts: 390
Think of it this way, when you are going strait power is given evenly to both wheels, as you turn the outside wheel is given more power. Plus i think these things have detroit lockers, look into that.
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'02 Red Z28, ebony leather, M6, T-tops, Trac. cont., hurst shifter
Borla (the expensive cut-out), Wisperlid W/K&N, FRA, Cags eliminator, Strange 4.10's, G2 Rear Girdle, Valv. Synthetic 10W-30, Redline gear oil, Fat hurst shift ****, Lead foot
Soon to be:
Alpine Screen, Orion xtr 800.4, xtrpro 1000, Kicker 12L7 in a milhouse, Focal polykev K2's, Focal utopia 6" audiom midrange.
------------------
'02 Red Z28, ebony leather, M6, T-tops, Trac. cont., hurst shifter
Borla (the expensive cut-out), Wisperlid W/K&N, FRA, Cags eliminator, Strange 4.10's, G2 Rear Girdle, Valv. Synthetic 10W-30, Redline gear oil, Fat hurst shift ****, Lead foot
Soon to be:
Alpine Screen, Orion xtr 800.4, xtrpro 1000, Kicker 12L7 in a milhouse, Focal polykev K2's, Focal utopia 6" audiom midrange.
07-26-2002, 07:21 AM
#7
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Thread Starter
Join Date: Jul 2002
Posts: 266
Kick *** description guys, thanks!
Just one question, just for clarification. My Car has LSD/Posi/whatever then?
So all Camaros do? Or only Z28/SS? Or whats the story there? =)
------------------
-2002 Red Camaro SS
Chesapeake, Virginia
http://www.HeadRushPerformance.Com
Just one question, just for clarification. My Car has LSD/Posi/whatever then?
So all Camaros do? Or only Z28/SS? Or whats the story there? =)
------------------
-2002 Red Camaro SS
Chesapeake, Virginia
http://www.HeadRushPerformance.Com
07-26-2002, 09:50 AM
#8
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Join Date: May 2001
Location: Memphis, TN, USA
Posts: 1,122
<font face="Verdana, Arial" size="2">Originally posted by Desolate_Flux:
Just one question, just for clarification. My Car has LSD/Posi/whatever then?</font>
Just one question, just for clarification. My Car has LSD/Posi/whatever then?</font>
Yes .. your ccar has posi.
07-26-2002, 02:50 PM
#9
Registered User
Join Date: Jun 1999
Location: OR
Posts: 2,368
98+ Z28 all have Torsen diff's. actually the Torsen's don't have clutch's.. instead they have smoe wierd gear arrangement that somehow transfers tq between wheels when it senses slippage....
Then, there is then Auburn(spelling?) posi option, that uses clutches..
Then, there is then Auburn(spelling?) posi option, that uses clutches..
<font face="Verdana, Arial" size="2">Originally posted by Desolate_Flux:
Kick *** description guys, thanks!
Just one question, just for clarification. My Car has LSD/Posi/whatever then?
So all Camaros do? Or only Z28/SS? Or whats the story there? =)
</font>
Kick *** description guys, thanks!
Just one question, just for clarification. My Car has LSD/Posi/whatever then?
So all Camaros do? Or only Z28/SS? Or whats the story there? =)
</font>
07-26-2002, 05:55 PM
#11
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Join Date: May 1999
Location: Chelsea, MI
Posts: 2,881
Did someone say our cars have Detroit Lockers?
hahah
Anyways
Posi and Limited Slip are almost the same thing. if you wanted to get all techy, then no we dont have Posi's we have limted slips.
Odds are this guy had either the Torsen or Auburn Limited Slip anyways.
Ignore people like that, they havnt the slightest idea whats goin on.
------------------
DaveD
1998 WS6 #207
-ARE Stage II Head/Cam
1998 Regal GS
-It Has Boost
The Phantom of CamaroZ28.com
Http://PhantomTA.cz28.com
hahah
Anyways
Posi and Limited Slip are almost the same thing. if you wanted to get all techy, then no we dont have Posi's we have limted slips.
Odds are this guy had either the Torsen or Auburn Limited Slip anyways.
Ignore people like that, they havnt the slightest idea whats goin on.
------------------
DaveD
1998 WS6 #207
-ARE Stage II Head/Cam
1998 Regal GS
-It Has Boost
The Phantom of CamaroZ28.com
Http://PhantomTA.cz28.com
07-27-2002, 07:20 AM
#12
Registered User
Join Date: Nov 1999
Location: Lincoln Park, MI US
Posts: 446
Posi (actualy called Posi-Traction) is simply the name GM gives to the Limited Slip Differentials that they put in their cars, FOrd calls them Trac-Locks (or used to at least, dont know if they still do) and Chrysler had a different name for them back in the day. They are all the same thing, which was explained already so I wont get into that.
The Torsen is a different animal, However I think GM still calls it a Posi, even though it isnt an LSD. It is a torque biasing differential, and both tires need to be under load for it to "lock up" its an oddball design. The company that makes detroit lockers also makes a nearly identical unit to the torsen, which is probalby where someone heard that they come with a Det locker.
ALL 98 Z28's came with Auburn limited slips. The torsen or a heavy duty Auburn unit could be had in an SS in 98. In 99 the standard unit became the Torsen, with the auburn heavy duty available as an option in the SS. (I assume this applys to the Firebird/WS6/Firehawk in the same manner, but I never looked into it)
The Torsen is a different animal, However I think GM still calls it a Posi, even though it isnt an LSD. It is a torque biasing differential, and both tires need to be under load for it to "lock up" its an oddball design. The company that makes detroit lockers also makes a nearly identical unit to the torsen, which is probalby where someone heard that they come with a Det locker.
ALL 98 Z28's came with Auburn limited slips. The torsen or a heavy duty Auburn unit could be had in an SS in 98. In 99 the standard unit became the Torsen, with the auburn heavy duty available as an option in the SS. (I assume this applys to the Firebird/WS6/Firehawk in the same manner, but I never looked into it)
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