Hey as u guys can tell by my member name i have a 1982 z28. just today i took the car out to open her up a bit and well i decided to do a little burn out at the end of my block and so i put it in 1st and hammered on the gas and spun the tire becuzi thought i had the one wheel wounder. but then i saw that i left to strips. so i had my friend get out of the car and stand on the drive side and so i dropped it into 1st again and proceded to hit the gas. he said that once i started on te gas the driver side tire jerked a little bit and then started to spin. i also woundered if i had posi so i jack the car up on jack stand and spun the drive side tire forward and the passener side spun the opposite direction. now do any of u guys think i might have a limited slip or what.

but anyway it was fun as hell to spin both tires. :lala:

 

Turn hard right and try a burnout(in an open area). Open type rear ends can do 2 wheeled burnouts if the traction is about the same on each wheel. If you spin the tire and the other spins opposite that is probably an open rear. Pop the cover and check to see for sure.

 

the thing is that i just did a brake stand(burnout) from a dead stop. i locked the brakes and hit the gas and both tires spun at the same time. and i let off the gas and just went straight.

 

i would say its a open rear

 

If the 2 wheels turn in opposite directions with less than 60 ft-lbs or so to force them, it's a one-wheel-peeler.

 

what he said ...... be glad your chassis is setup so that both tires spin at the same time

 

but its kinda funny becuz my brother has posi in his 91 z28. well its a really weak posi but it still works from a roll but anyway. we jacked his car up and we spun his wheels awhile ago like couple of months and they spun im pretty sure the opposite directions. and yet his posi still works when he hammers on the gas from a roll becuz that how weak his posi is. and i was watchin Popular Hot Rodding TV on TNN awhile ago and they were explaining things about posis and limited slip and what not. and with the limited slip they showed on a little animation that once the one wheel is spining the other will engage to spin to get the car moving. like they showed a old camaro on the thing of ice on the animation and they had the one wheel spining and then the other ingaged to get the car movin forward. i hope i have it on video becuz i think i might have recorded it but not sure.

also ive heard that if u have a one wheel wounder that if u get the car up to a certain RPM that the wheel not spining will start to spin? true or not true? i dunno what rpm i was at but it wasnt really high at all. like my car idles around 500 to like 700 maybe less then 700 and i went from a dead stop and once i started hittin the gas my friend said the driver side wheel started to brake loose and then the tire started spin. well gtg later:lala:

 

With an open diff, power is equal to both wheels until one spins easier than the other. The power follows the easiest path. RPM has nothing to do with it. "hammers on the gas from a roll becuz that how weak his posi is." not sure what you mean by that, hammering the gas from a roll will probably allow an open rear to grip. Put the right rear in a puddle of water, with the left rear tire dry, sitting on dry pavement. See what happens. Keep in mind that when it does the one wheeled spin, the actual speed of the wheel is twice the speedo reading.

Another test: Jackup one of the rear wheels, leaving the other firmly on the ground. Start up the car and put it into D. Watch how only one wheel spins.

 

that just doesnt seem like such a good idea....

 

tonight at the car show i ask this guy that know his **** and well he told me that he thinks i have limited slip. not posi or a one wheel wounder. becuz he said the same thing ive been sayin about wityh the limited slip if u jack the car up like the rear end and spin the tire and they go in opposite direction but when u do a brake stand he said that once the one wheel starts to spin the power gets delivered over to the other wheel and then both r spining. and thats limited slip. but all i know is that it was sweet to spin both wheels at the same time.:lala:

 

Posi is GM's name for limited slip--they are the same thing. Maybe he doesn't know ****? I used to many 2 wheeled burn-outs with an open rear car.

 

if u knew the guy u would think he knows his **** but since u dont then its just ur opion and i dont think anyone really cares since u dont know the guy. okay period. yes i know GMs name for posi is limited slip. but there is a difference between a posi and a limited slip. posi is always moving both tires and puttin the same amount of power to both tires, so u get better traction and whatnot. limited slip is when one wheel is spining and then it delivers the power from that wheel to the one that is not to get it to move and hence u spin both tires. but im stickin with the guy i know becuz he knows his ****.

 

I was just reading this post and found something really scary.
Now I know not everyone has this knowledge, although as I recall someone stated something about 2X wheel speed, this is not a good thing to do. Think about it, your tire is spinning 2X as fast as your speedo says, then the pinion(spider) gears are also spining twice as fast. now imagine the amount of heat and friction going on inside the diff itself. It actually gets hot enough to "weld" the pinion(SPIDER) gears to the shaft they rotate on. and if this happens you'll be buying not only a diff but you'll have to rebuild the entire rear axle( metal shavings in the bearings and wut not). When the Spider gears weld to the "pinion" shaft your diff will suddenly lock up, all in all its a bad situation.

 

Posi=limited slip. There is no difference. With limited slip, bot wheels will spin all of the time unless there is enough force trying to turn them oposite directions, such as going around corners. If your wheels turn oposite directions then it is an open rear. If you have posi/limited slip they will turn the same direction, or if the posi is worn out possibly one may not turn at all. I happen to agree that that guy at the car show probably didnt know what he was talking about if he said otherwise.

Ben

 

He's getting posi confused with a spool. Seems like that's happening a lot lately.

 

By the way that post by azzkker1 was actually by me. I forgot to log my friend off of my computer before I posted.

Ben

 

I had a 83 Z28 with posi. It worked fine. one thing I noticed was with the car jacked up and the tranny in neutral turning one wheel foraward and the other wheel would turn forward. With the car in park the wheels would turn oposite. My 89 IROC has worn out posi. I mean one wheel peel even in the rain. If I jack it up with car in neutral both tires spin same way. I never tried the 89 in gear. My 87 IROC has the borg warner with 327's. I never spun the wheels jacked up but it gets side to side every time you hammer it.

Rich