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Old 12-01-2012, 05:20 AM   #1 (permalink)
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Default Rear wheel spin

Hi,

i have problem with rear wheel spin, looks like there is no power to front wheels and heard some bang. The driveshafts apear to be O.K. any advise what else can be wrong? I suspect front diff or propshaft, but that would have to be serious power to brake propshaft. Is there any thread which shows exactly how this works? Any help would be appriciated. The car electronics only detects recent ABS sensor malfunction on one of the rear wheels, but i thing this should not affect 4WD as the front should be engaged at all times.
There is a possibility, that im just imagining it and the rear is likely to spin whit DSC off. Is there some simple test for this? I was thinking about leave my handbrake on a little bit so i would disengage the rear, then step on it and see if there is any power. But it realy feels like there is too much power to rear compared to front.

Last edited by lmiksche1; 12-01-2012 at 07:32 AM.
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Old 12-01-2012, 09:13 AM   #2 (permalink)
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IMO, I really wouldn't drive the car anymore until you get it checked out. You could have broken any number of things, and could be doing more damage each time you drive it.
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Old 12-01-2012, 09:46 AM   #3 (permalink)
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Mazdaspeed 6 Technical Training

That guide includes details on the awd system.

Assuming loss of torque to front axles, I'd suspect a problem with the front diff or perhaps the pto. It sounds as if one corner of the front is no longer getting drive.

If you're not mechanically inclined & well tooled than I would suggest contacting your Mazda dealer or mechanic of choice.
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Old 12-01-2012, 10:43 AM   #4 (permalink)
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Well, the problem is, that when i put car to the Mazda garage, they said they couldnīt find anything wrong, no broken driveshafts or so, except the faulty ABS sensor in the rear. I tried to put a little bit of hanbrake on to disengage the rear and i got positive spin in the front, at at least one whel, but as there is just standard diff in the front it will transfer more torque to unloaded side. So i assume there is propably just so much torque that the tires canīt handle that any more. But i assume should something be wrong wit the diff or so, the electronics should detect it and give some warning. Correct?
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Old 12-01-2012, 12:41 PM   #5 (permalink)
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I don't think anyone here can really determine what your problem is, without significantly more information. What mods are done to the car? What condition are the tires in? What were the driving conditions? What were you doing at the time the tires were spinning, ie launching, flooring it around a curve in the rain etc? That kind of thing.
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Old 12-01-2012, 02:07 PM   #6 (permalink)
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Well the mods are simple. Stage 1 map + COBB SRI, 99oct fuel boostin 20psi. But running BBR map, not the COBB AP. The problem seems to be bad enough especialy on wet road, under full throtle at about 3-4,5K RPM, even on second gear it just breaks traction on straight road, it looks to me, that its just the rear, that spins, but could be the front as well, canīt tell for sure. Tires are standard winters Yokohama 215x35x18". But if some light comes on, its the traction contol, the 4WD light is off all the time. If i switch off the DSC, it just goes wild, but no indication of 4WD problem on dashboard and the garage says so as well, nothing they could see on diagnostic and visualy it looks O.K. as well, not sure if they look into the diff, but surely, if there is problem with diff, it wouldnīt be spining either front wheel when u put the handbrake on. So im realy getting to conlusion, that the problem is in my head, not in the car. But if im not mistaken it should only transfer more power to the rear only when it detects difference btw. front and rear wheel speed, so why would be then the rear spinning if so? I had the look at the shematics, but im not sure if i realy 100% understand how this works.

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Old 12-01-2012, 02:36 PM   #7 (permalink)
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Quote:
Originally Posted by TiGraySpeed6 View Post

It sounds as if one corner of the front is no longer getting drive.
Like a gearing for the front wheels sheered and is limiting transfer?



Try changing your PTO and trans oil. See if there is any metal parts or shavings.

As far as power distribution, its a 50/50 system and will send more power to the front if need be. I don't think power transfer to the rear ever exceeds 50%
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Old 12-01-2012, 04:02 PM   #8 (permalink)
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unless you broke a spider gear in the front diff, it seems very unlikely there is hard failure in the front. Its pretty stout. That leaves the PTO and wheel speed sensor. You said it was defective, but it didn't throw a code and was it replaced??
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Old 12-02-2012, 02:10 AM   #9 (permalink)
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Itīs due to be replaced on tuesday. It only throw code for the wheel speed sensor of the ABS system. Could that be the cause? When i think of it, if it can actualy trigger the ABS, it surely must report to DSC, that the rear is going slower then the front, but only one wheel. Sorry iīm little bit a new to this what is PTO? Yes the limit is 100/0 to 50/50, so i dont think, there should be rear slip.

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Old 12-02-2012, 06:31 PM   #10 (permalink)
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Well weīve just got some snowfall, so i took the advantage of it and there is definately power to both front wheels, but i stil think that the balance of power front to rear is a bit off.
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