Discussion
Does it clunk after motorway miles? Have you ever put friction modifier in it? Does it spin one inside wheel when going around T junctions?
If the answer is yes/no/yes then go to your friendly servicer and get some modifier in.
Mine has started the above slightly, but have done about 30k since the modifier went in.....
On another note is their any connection between diff lock up and axle tramp? - Had a bad case of tramp (first time ever) the other day on a dry warm road with warm tyres.
If the answer is yes/no/yes then go to your friendly servicer and get some modifier in.
Mine has started the above slightly, but have done about 30k since the modifier went in.....
On another note is their any connection between diff lock up and axle tramp? - Had a bad case of tramp (first time ever) the other day on a dry warm road with warm tyres.
racebreed1 said:
no not the illegal stuff!
does the VXR LS2 have a LSD? i think i can get one wheel spinning up which would indicate its gone open on me!
does the VXR LS2 have a LSD? i think i can get one wheel spinning up which would indicate its gone open on me!
It is meant to, but I've noticed the same. I'll get it looked into when I'm next near a reputable garage. Doing a spot of car control practice in the office car park resulted in the tyre on the inside of a turn getting atomised. That ain't right!
Axle tramp according to my research is the diff searching for traction, it sends torque alternately from one side to the other looking for grip. This was nicely illustrated by Granada recently with his drag strip axle tramp skids pic.
Interestingly enough the GTO boys have been running different axle shaft weights on each side of the diff to fix this. And more interestingly the latest CTS-V, yes the LSA 6.2L SC one, runs a 35mm shaft one side and a 55mm on the other to address this exact issue, in the article it explained why this was done as per above.
Various things help, but that appears to be the best fix, though I think a torsen type diff or similar may well be a better performance solution without messing about with all that. Also easier to maintain and more reliable. No friction modifier required etc.
Or if you are insane you might like a detroit locker lsd or equiv.
Interestingly enough the GTO boys have been running different axle shaft weights on each side of the diff to fix this. And more interestingly the latest CTS-V, yes the LSA 6.2L SC one, runs a 35mm shaft one side and a 55mm on the other to address this exact issue, in the article it explained why this was done as per above.
Various things help, but that appears to be the best fix, though I think a torsen type diff or similar may well be a better performance solution without messing about with all that. Also easier to maintain and more reliable. No friction modifier required etc.
Or if you are insane you might like a detroit locker lsd or equiv.
wolfracer said:
Does it clunk after motorway miles? Have you ever put friction modifier in it? Does it spin one inside wheel when going around T junctions?
If the answer is yes/no/yes then go to your friendly servicer and get some modifier in.
Mine has started the above slightly, but have done about 30k since the modifier went in.....
On another note is their any connection between diff lock up and axle tramp? - Had a bad case of tramp (first time ever) the other day on a dry warm road with warm tyres.
If the answer is yes/no/yes then go to your friendly servicer and get some modifier in.
Mine has started the above slightly, but have done about 30k since the modifier went in.....
On another note is their any connection between diff lock up and axle tramp? - Had a bad case of tramp (first time ever) the other day on a dry warm road with warm tyres.
modifier? whats that and is it covered under warranty?
The question should be, have you had the oil changed in the diff?
The standard Holden oil will not let the LSD work properly this has been said many times over the years on this forum.
If you get the oil changed to a decent after market brand it should work fine.
Friction modifier is an additive for the good oils which makes the clutch cones slip more. If you just change the oil in the diff will be locking up and making noise allot of the time.
With the addition of friction modifier you can get the diff to lock and be able to reverse in a carpark without making noise.
The standard Holden oil will not let the LSD work properly this has been said many times over the years on this forum.
If you get the oil changed to a decent after market brand it should work fine.
Friction modifier is an additive for the good oils which makes the clutch cones slip more. If you just change the oil in the diff will be locking up and making noise allot of the time.
With the addition of friction modifier you can get the diff to lock and be able to reverse in a carpark without making noise.
I recently had the diff oil change during a service at Monkfish and the difference has quite surprised me, i was getting the occasional "clonk-clonk" coming off the motorway and one wheel spinning this has all gone now but also the car is so much smoother to drive at low speeds around town gear changes are now smooth without that agricultural backlash between gear changes (dont expect miracles but its significently better)
L2VXR said:
I recently had the diff oil change during a service at Monkfish and the difference has quite surprised me, i was getting the occasional "clonk-clonk" coming off the motorway and one wheel spinning this has all gone now but also the car is so much smoother to drive at low speeds around town gear changes are now smooth without that agricultural backlash between gear changes (dont expect miracles but its significently better)
That's because Monkfish set it up properly for you. The original OP obviously has not got his LSD doing what it should do - lock up under power to drive both rear wheels at the same time. You can still get clonking as the diff releases itself to work as a "differential" should.I'll hazard a guess that there are loads of people that don't know if their diffs are setup or working properly.
It's basically a crap design that I believe has been fixed in the VXR8's.
If you want a proper LSD ( that works) you need either a Kaaz or a True Trac.
MyM8V8 said:
L2VXR said:
I recently had the diff oil change during a service at Monkfish and the difference has quite surprised me, i was getting the occasional "clonk-clonk" coming off the motorway and one wheel spinning this has all gone now but also the car is so much smoother to drive at low speeds around town gear changes are now smooth without that agricultural backlash between gear changes (dont expect miracles but its significently better)
That's because Monkfish set it up properly for you. The original OP obviously has not got his LSD doing what it should do - lock up under power to drive both rear wheels at the same time. You can still get clonking as the diff releases itself to work as a "differential" should.
I'll hazard a guess that there are loads of people that don't know if their diffs are setup or working properly.
It's basically a crap design that I believe has been fixed in the VXR8's.
If you want a proper LSD ( that works) you need either a Kaaz or a True Trac.
With respect it is the oil!! The design is fine as long as there is a decent oil in it basically the standard oil is no good and you get one wheel smoking. The oil has been a problem since the VT series of cars. This problem comes up again and again on this forum and once the oil is changed the diff works fine!
Kaaz looks like a clutch type arrangement anyway, just more and thicker ones and some adjustment.
Torsen type aka truetrac looks cool as its all mechanical but apparently doesnt transfer torque in free wheel spin situations, it needs some torque resistance to work. (ie) Bad in ice or free air
Get a mini spool
Torsen type aka truetrac looks cool as its all mechanical but apparently doesnt transfer torque in free wheel spin situations, it needs some torque resistance to work. (ie) Bad in ice or free air
Get a mini spool
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