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Registered
Join Date: Jul 2003
Location: Back in B'ham, AL
Posts: 3,459
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Differential testing
If, with the car jacked up, you turn one of the rear wheels in one direction the other turns on the same direction you have limited slip; if it turns the opposite direction you don't have limited sliped but a standard differential.
The question is: What do you have when you turn one of the rear wheels and nothing happen to the other wheel??? On another words, you can turn either one of the rear wheels in any direction and the other one does not move. |
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06-22-2008, 10:05 AM
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Max Sluiter
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You have a broken differential
 I don't think it is broken, actually. I think you have an open differential. Do you have the car in gear? If yes and it does this, then I am not experienced enough to tell. If this is an early car, make sure you do not have a failed "simplified" differential Edit: 901 posts :-)
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1971 911S, 2.7RS spec MFI engine, suspension mods, lightened Suspension by Rebel Racing, Serviced by TLG Auto, Brakes by PMB Performance Last edited by Flieger; 06-22-2008 at 10:28 AM.. Reason: 901 posts |
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06-22-2008, 10:28 AM
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Immature Member
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Parking brake partially engaged perhaps?
If it's in gear and this happens... it's broken.
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1984 Carrera Coupe = love affair 1997 Eagle Talon Tsi = old girlfriend (RIP) 2014 Chrysler 300 AWD Hemi = family car "Lowering the bar with every post!" |
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06-22-2008, 08:20 PM
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Registered
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The car is in neutral, and you can turn one rear wheel in any direction and the other one just sits there...
While running there is no noise at all, plenty of power, excellent handling... the whole things appears normal. Puzzled??? |
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06-23-2008, 04:36 AM
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Moderator
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Spinning one and watching the other usually but not always works. There is some preload that is sensitive to input torque.
Have someone hold one while spinning the other, an effective lsd will make that difficult to do. An open or worn out lsd will not present much resistance.
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Bill Verburg '76 Carrera 3.6RS(nee C3/hotrod), '95 993RS/CS(clone) | Pelican Home |Rennlist Wheels |Rennlist Brakes | Last edited by Bill Verburg; 06-23-2008 at 04:49 AM.. |
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06-23-2008, 04:46 AM
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Max Sluiter
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Put it in gear, too.
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1971 911S, 2.7RS spec MFI engine, suspension mods, lightened Suspension by Rebel Racing, Serviced by TLG Auto, Brakes by PMB Performance |
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06-23-2008, 05:05 PM
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Registered
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If it's in neutral, you're just spinning the tranny guts instead of the opposite wheel. Put in in gear like Flieger sez.
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'88 Coupe Lagoon Green "D'ouh!" "Marge - it takes two to lie. One to lie, and one to listen" "We must not allow a Mineshaft Gap!" |
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06-23-2008, 06:09 PM
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Registered
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Location: Back in B'ham, AL
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I was at the track this past weekend for the PCA Club Race and noticed that almost all the 911/GT3/GT2 while on the jacks warming up (engine running) and fine tuning - in neutral - had the rear wheels spining, slowly but spinning... both in the same direction. However, there where some others - on the same mode - but the wheels were still. Why the difference?
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06-24-2008, 06:12 AM
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1971 Porsche 911S
1984 Porsche Carrera
Eagle Talon TSi AWD
Chrysler 300 AWD Hemi
1976 Porsche Carrera 3.0
1995 Porsche 993 Carrera Coupe
1988 Porsche 911 3.2
