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#11
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Assumptions: R X Final X Torque = Wheel Torque (is this right?) Suburban R:2.085 Final: 3.73 Total Ratio: 7.78 Torque: 385 Wheel Torque: 2994 BMW R: 3.295 Final:3.154 Total Ratio:10.39243 Torque:300 Wheel Torque: 3117 Is that math right? |
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#12
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This ZF box will not handle uphill tow in reverse - you are lucky it was not damaged.
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#13
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Well that was a minor detail I overlooked. Thanks all for your input.
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#14
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Elaborate, where are you getting this info?
__________________
| '17 F15 X5 35D - Work horse | '17 F48 X1 MSport Daughter's daily | '22 Tesla MY LR Wife's Daily | '09 E70 X5 35D - Out to pasture | |
#15
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#16
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More info from my digging... Talked to a ZF-certified transmission shop owner, and he thought I was describing a properly operating transmission. He's never heard of any issues with reverse like I was describing on the ZF8HP. Since the RPMs were staying low, that is an indicator that the transmission wasn't slipping.
I also removed "X5" from my google searches on backing uphill with trailers, and it is not an uncommon problem with vehicles that do not have a 4wd-low gear range. Now trying to figure out how to fit that circular driveway in our front yard. |
#17
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On this 8HP45 car - in reverse if the load is high as determined by the DME - engine torque is reduced (engine rpms reduced as you experienced) to protect the transmission...had to look up my notes about this complaint from another car.
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#18
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Is this the same for the 6 speed tranny?
__________________
| '17 F15 X5 35D - Work horse | '17 F48 X1 MSport Daughter's daily | '22 Tesla MY LR Wife's Daily | '09 E70 X5 35D - Out to pasture | |
#19
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I dont think so. I back-up my race car and trailer up to a short, relatively steep driveway and never felt power reduction. Perhaps there was not much room for the reverse gears and the 8 speed and they made them really tiny and fragile.
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#20
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Thats my experience as well, I have backed up my boat with no noticeable loss of power.
__________________
| '17 F15 X5 35D - Work horse | '17 F48 X1 MSport Daughter's daily | '22 Tesla MY LR Wife's Daily | '09 E70 X5 35D - Out to pasture | |
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Tags |
reverse, towing, transfer case, zf8hp45 |
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