2008 CX-7 AWD Vibration

29 messages, Last post on Oct 21, 2009 at 8:36 AM

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What is this discussion about? Mazda CX-7, SUV

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#28 of 29 Re: Need Your Help [wwest] by maavalous Oct 20, 2009 (2:44 pm)
Replying to: wwest (Oct 12, 2009 5:09 pm) Whoa there a minute. I don't have access to all the mfr. specs but I can assure you that the Toyota AWD is NOT the same as the Mazda (Toyata includes Lexus for my purposes). I did find info, and a video, of a Mazda engineer explaining their "internally designed and highly advanced active torque split system". Don't confuse the similarities between all F/awd systems with being the "same" system. All F/awd use a PTO, tailshaft and some form of rear differential control system. There is no way Toyota could be using the same system without buying it from Mazda and that isn't very likely. As for having cooling to the PTO... hmmm, I'm a bit surprised Toyota doesn't do it. But, perhaps it's because Mazda couldn't get theirs to keep from overheating? A lot of other F/awd designs do not have cooling as well (BorgWarner for one). All I know on that topic... but, seems like cooled would be better than uncool Replies to this message: wwest (Oct 21, 2009 8:36 am)
#29 of 29 Re: Need Your Help [maavalous] by wwest Oct 21, 2009 (8:36 am)
Replying to: maavalous (Oct 20, 2009 2:44 pm) I subscribe to techinfo.toyota.com and I cannot find any differences between the new Toyota F/awd system vs the one in the Ford Escape. Insofar as I know Ford being the first to introduce this system. "...buying form Mazda..." This new F/awd system may well have been developed by one of the transmission company's, independent of a single marque. I note the Porsche has now adopted the very same technique except for it being used for R/awd. "..Mazda couldn't keep theirs from overheating..." No, historically it was Ford that couldn't keep the PTO/ATC from overheating. Ford reacted by revising the firmware such that the driveline windup stress was significantly reduced. Apparently Mazda wanted to keep the full F/awd functionality and therefore added the cooling. It will be interesting to see how functional the Venza F/awd system is vs the RX350. I strongly suspect Lexus will soon either eliminate the PB for manually engaging the rear drive or add PTO cooling. Easier to revise the firmware once they discover that most driver's, even Lexus driver's, haven't a clue as to when to use, of not, the manual mode.

#28 of 29: Re: Need Your Help [wwest] by maavalous; Oct 20, 2009 (2:44 pm)

Replying to: wwest (Oct 12, 2009 5:09 pm)

Whoa there a minute. I don't have access to all the mfr. specs but I can assure you that the Toyota AWD is NOT the same as the Mazda (Toyata includes Lexus for my purposes).
I did find info, and a video, of a Mazda engineer explaining their "internally designed and highly advanced active torque split system". Don't confuse the similarities between all F/awd systems with being the "same" system. All F/awd use a PTO, tailshaft and some form of rear differential control system. There is no way Toyota could be using the same system without buying it from Mazda and that isn't very likely.

As for having cooling to the PTO... hmmm, I'm a bit surprised Toyota doesn't do it. But, perhaps it's because Mazda couldn't get theirs to keep from overheating? A lot of other F/awd designs do not have cooling as well (BorgWarner for one). All I know on that topic... but, seems like cooled would be better than uncool

wwest (Oct 21, 2009 8:36 am)

#29 of 29: Re: Need Your Help [maavalous] by wwest; Oct 21, 2009 (8:36 am)

Replying to: maavalous (Oct 20, 2009 2:44 pm)

I subscribe to techinfo.toyota.com and I cannot find any differences between the new Toyota F/awd system vs the one in the Ford Escape. Insofar as I know Ford being the first to introduce this system.

"...buying form Mazda..."

This new F/awd system may well have been developed by one of the transmission company's, independent of a single marque. I note the Porsche has now adopted the very same technique except for it being used for R/awd.

"..Mazda couldn't keep theirs from overheating..."

No, historically it was Ford that couldn't keep the PTO/ATC from overheating. Ford reacted by revising the firmware such that the driveline windup stress was significantly reduced. Apparently Mazda wanted to keep the full F/awd functionality and therefore added the cooling.

It will be interesting to see how functional the Venza F/awd system is vs the RX350. I strongly suspect Lexus will soon either eliminate the PB for manually engaging the rear drive or add PTO cooling. Easier to revise the firmware once they discover that most driver's, even Lexus driver's, haven't a clue as to when to use, of not, the manual mode.