Quilshaft
Member
- Posts
- 20
- Location
- Clare Ireland
When trying to figure out your VCU issue this might help clarify things.
Hi all this is a long post but needed- I'm reading all the threads on VCUs and there is much focus on time tests ,which is a good way to test its true but I'd like to add my 2p worth and point out that a stiff VCU ( they do seem to tighten up as they get old)-,will load the transmission more ON road because the wheels are held more rigidly by the Tarmac in a " wound up " condition. The wind up is caused by the fact that it is not possible to ever get all the wheels exactly the same diameter and therefore revolutions per mile. It can be seen therefore that the stiffer the vcu the more stress will be present and this compounds with vehicle speed because the faster the vehicle is moving the greater wheel rpm discrepancy that must be dissipated by the the vcu per minute and at 60 mph it only takes 60 seconds to cover a mile so ... The resultant difference must be able to be released AS it is occurring. I don't know any numbers but personally I'd like to be able to turn my VCU fairly easily. When I lose front wheel traction the vcu operates similarly to a torque converter in providing " a proportion " of the torque sufficient to move the vehicle to the next place the front wheels can grip again and that's all it does. The freelander is a front wheel drive car with some standby rear wheel push if needed. Please don't reply to this post I'd like to create an uncluttered bit of stuff thingy thanks guysngals
Hi all this is a long post but needed- I'm reading all the threads on VCUs and there is much focus on time tests ,which is a good way to test its true but I'd like to add my 2p worth and point out that a stiff VCU ( they do seem to tighten up as they get old)-,will load the transmission more ON road because the wheels are held more rigidly by the Tarmac in a " wound up " condition. The wind up is caused by the fact that it is not possible to ever get all the wheels exactly the same diameter and therefore revolutions per mile. It can be seen therefore that the stiffer the vcu the more stress will be present and this compounds with vehicle speed because the faster the vehicle is moving the greater wheel rpm discrepancy that must be dissipated by the the vcu per minute and at 60 mph it only takes 60 seconds to cover a mile so ... The resultant difference must be able to be released AS it is occurring. I don't know any numbers but personally I'd like to be able to turn my VCU fairly easily. When I lose front wheel traction the vcu operates similarly to a torque converter in providing " a proportion " of the torque sufficient to move the vehicle to the next place the front wheels can grip again and that's all it does. The freelander is a front wheel drive car with some standby rear wheel push if needed. Please don't reply to this post I'd like to create an uncluttered bit of stuff thingy thanks guysngals
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