Re: [MBZ] OT AWD and tire wear
Undiagnosed strut failure on my Jetta caused the fronts to rapidly wear. Now that I have replaced them the tire pressure monitoring nanny is unhappy. I think this car has the more primitive tire pressure monitoring system where it's actually monitoring rotation rate and comparing the wheels, the fronts are somewhat larger than the rears so it thinks the rears are down on pressure. That's only a guess on my part, the tires are all actually at the same pressure. I'm hoping as the fronts wear it'll balance out. I needed to replace one barely used tire on the pickup due to an unfortunate meeting with a curb, I think it has a similar tire pressure monitoring system and it was equally upset. After 1000 miles to camp and back it seems to have mostly worked it out now though. The light came on a couple times when we first left camp but after the tires warmed up it went out and stayed out... -Curt On Saturday, June 5, 2021, 10:43:53 PM EDT, Allan Streib via Mercedes wrote: So I realized today that the tires on the Element had been neglected as far as regular rotation. As a result, the fronts were significantly more worn than the rears. Reading about how the AWD works on that car, it's normally FWD with a hydraulic clutch that engages the rear wheels when needed. There are dual pumps in the rear differential. One pump is driven by the driveshaft from the front, the other by the rear diff. If all the wheels are turning at the same speed the pressures balance and the rear clutch is disengaged. If the front wheels are slipping, that pump will turn faster and create pressure that engages the rear wheels. So there can be a problem if the front and rear tires are not the same size. Apparently Honda says they should be within 3/4" circumference. I measured my tires and the difference is closer to an inch. Based on this explanation, I moved the unworn tires to the front, and the worn tires to the rear, as they fronts will then be turning a little slower than the rears. Hopefully the system will not see this as needing to engage the rear drive, as it's the opposite of the front wheels slipping. I also inflated the rears to 35lbs and the fronts to 30. I have not yet measured how much of a difference this makes. I really need to just get two new front tires, but most tire shops will not sell me two tires for this car. The rears are practically new as far as wear; they have a lot of tread left. Thinking of just taking the two front wheels in to the shop and having them mount two of the same tires. Allan ___ http://www.okiebenz.com To search list archives http://www.okiebenz.com/archive/ To Unsubscribe or change delivery options go to: http://mail.okiebenz.com/mailman/listinfo/mercedes_okiebenz.com ___ http://www.okiebenz.com To search list archives http://www.okiebenz.com/archive/ To Unsubscribe or change delivery options go to: http://mail.okiebenz.com/mailman/listinfo/mercedes_okiebenz.com
Re: [MBZ] OT AWD and tire wear
Either that or just carry them in as you suggested. I’ve done that on a couple of cars with my local tire guys. They don’t seem to care as far as the application if you carry in. You just tell them what tires you want and they do the rest. -D > On Jun 5, 2021, at 11:13 PM, Buggered Benzmail via Mercedes > wrote: > > Order done from TireRack or wherever > > --FT > Sent from iPhone > >> On Jun 5, 2021, at 10:43 PM, Allan Streib via Mercedes >> wrote: >> >> I really need to just get two new front tires, but most tire shops will >> not sell me two tires for this car. > > ___ > http://www.okiebenz.com > > To search list archives http://www.okiebenz.com/archive/ > > To Unsubscribe or change delivery options go to: > http://mail.okiebenz.com/mailman/listinfo/mercedes_okiebenz.com > ___ http://www.okiebenz.com To search list archives http://www.okiebenz.com/archive/ To Unsubscribe or change delivery options go to: http://mail.okiebenz.com/mailman/listinfo/mercedes_okiebenz.com
Re: [MBZ] OT AWD and tire wear
Order done from TireRack or wherever --FT Sent from iPhone > On Jun 5, 2021, at 10:43 PM, Allan Streib via Mercedes > wrote: > > I really need to just get two new front tires, but most tire shops will > not sell me two tires for this car. ___ http://www.okiebenz.com To search list archives http://www.okiebenz.com/archive/ To Unsubscribe or change delivery options go to: http://mail.okiebenz.com/mailman/listinfo/mercedes_okiebenz.com
[MBZ] OT AWD and tire wear
So I realized today that the tires on the Element had been neglected as far as regular rotation. As a result, the fronts were significantly more worn than the rears. Reading about how the AWD works on that car, it's normally FWD with a hydraulic clutch that engages the rear wheels when needed. There are dual pumps in the rear differential. One pump is driven by the driveshaft from the front, the other by the rear diff. If all the wheels are turning at the same speed the pressures balance and the rear clutch is disengaged. If the front wheels are slipping, that pump will turn faster and create pressure that engages the rear wheels. So there can be a problem if the front and rear tires are not the same size. Apparently Honda says they should be within 3/4" circumference. I measured my tires and the difference is closer to an inch. Based on this explanation, I moved the unworn tires to the front, and the worn tires to the rear, as they fronts will then be turning a little slower than the rears. Hopefully the system will not see this as needing to engage the rear drive, as it's the opposite of the front wheels slipping. I also inflated the rears to 35lbs and the fronts to 30. I have not yet measured how much of a difference this makes. I really need to just get two new front tires, but most tire shops will not sell me two tires for this car. The rears are practically new as far as wear; they have a lot of tread left. Thinking of just taking the two front wheels in to the shop and having them mount two of the same tires. Allan ___ http://www.okiebenz.com To search list archives http://www.okiebenz.com/archive/ To Unsubscribe or change delivery options go to: http://mail.okiebenz.com/mailman/listinfo/mercedes_okiebenz.com
