Different tires = blown transmission?
#16
09-03-2010, 02:05 PM
I just blew one tire. I ended up buying brand new PZeros all around. I got a different answer everytime I asked about whether I needed to replace all four. In the end, replacing all four tires seems to safest way to go. You can get all 4 for $1500 on tire rack right now. Much cheaper than a new tranny.
#17
09-05-2010, 04:32 PM
Let's say you have the same brand/model tire in the front and rear. The fronts are down to the wear bar and the rears are brand spanking new.
1. Since the fronts are down to the wear bar, they are actually smaller in diameter than if they were new
2. Since the fronts are down to the wear bar (and has more heat cycles) and the rears are brand new, there are different levels in grip between the front and rear.
Will the above situation tear up your AWD diff? I think not.
Just think of ALL of those AWD SUV, truck, and sedan owners out there that are running mismatched tires on 2 or more corners. I'd be willing to be that Lamborghini/Audi/VW does not engineer/manufacture the AWD diff, but a company that specializes in engineering/manufacturing manufactures the diff. This company probably engineers/manufactures AWD diffs for other car manufacturers as well.
/m
1. Since the fronts are down to the wear bar, they are actually smaller in diameter than if they were new
2. Since the fronts are down to the wear bar (and has more heat cycles) and the rears are brand new, there are different levels in grip between the front and rear.
Will the above situation tear up your AWD diff? I think not.
Just think of ALL of those AWD SUV, truck, and sedan owners out there that are running mismatched tires on 2 or more corners. I'd be willing to be that Lamborghini/Audi/VW does not engineer/manufacture the AWD diff, but a company that specializes in engineering/manufacturing manufactures the diff. This company probably engineers/manufactures AWD diffs for other car manufacturers as well.
/m
and regarding your assumption, I think you're wrong.. The differential is pre-programmed to not work or distribute torque under optimal situations, but starts working when recognizing different tire/stability reports.
When the car is set to distribute torque equally between the front and rear axle, lets say, that means that each tire should recieve 25% of the traction in usual conditions (thats if the torque distribution is 50/50 for example). The rear tires will have better traction, and therefore will change is traction percentage to 60/40 in favor of the rear for example. This will force the 'centre' differential to start sending more torque to the front, or react differently by either braking or so.
Let me know if theres any point to make clear
#18
09-06-2010, 08:27 AM
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yes, you will make your diff not like you. It may work, but you have a lambo? run all the same tires, advan ad08 is the ****
#19
09-06-2010, 09:52 AM
Im not saying that the differentials are not in good shape or unreliably built, I'm saying that they 'shorten' the lifetime of the parts, and thats undeniably true.
and regarding your assumption, I think you're wrong.. The differential is pre-programmed to not work or distribute torque under optimal situations, but starts working when recognizing different tire/stability reports.
When the car is set to distribute torque equally between the front and rear axle, lets say, that means that each tire should recieve 25% of the traction in usual conditions (thats if the torque distribution is 50/50 for example). The rear tires will have better traction, and therefore will change is traction percentage to 60/40 in favor of the rear for example. This will force the 'centre' differential to start sending more torque to the front, or react differently by either braking or so.
Let me know if theres any point to make clear
and regarding your assumption, I think you're wrong.. The differential is pre-programmed to not work or distribute torque under optimal situations, but starts working when recognizing different tire/stability reports.
When the car is set to distribute torque equally between the front and rear axle, lets say, that means that each tire should recieve 25% of the traction in usual conditions (thats if the torque distribution is 50/50 for example). The rear tires will have better traction, and therefore will change is traction percentage to 60/40 in favor of the rear for example. This will force the 'centre' differential to start sending more torque to the front, or react differently by either braking or so.
Let me know if theres any point to make clear
So even if you have the cheapest, all-season tires worn down to the wear bars in the front and the most expensive max perf summer tires in the rear, it's the grip in the rear that determines what gets transferred to the front. The front wheels have no input whatsoever.
/m
#20
09-06-2010, 11:33 PM
Lamborghini uses a viscous coupling system like the Porsche 996. In both situations, when the rear wheels begin slipping, power is routed to the front wheels. I don't know what the initial split on the Gallardo is, but on the 996 it is 5/95 front/rear; when the rear wheels slip, traction is transferred to the front wheels up to 40/60 front/rear.
So even if you have the cheapest, all-season tires worn down to the wear bars in the front and the most expensive max perf summer tires in the rear, it's the grip in the rear that determines what gets transferred to the front. The front wheels have no input whatsoever.
/m
So even if you have the cheapest, all-season tires worn down to the wear bars in the front and the most expensive max perf summer tires in the rear, it's the grip in the rear that determines what gets transferred to the front. The front wheels have no input whatsoever.
/m
I dont care about the split, I was just using the torque split example to clarify more.. My point is installing different tire (tread life or brand) shortens the life of the differential because it works continiously unlike normal situations where the differential doesnt work in normal situations.
My whole point is about over-working the differential, and the risks in the long term
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