WOT auto shift problem(?)
Thread Starter
Instructor
Joined: Dec 2007
Posts: 101
Likes: 0
WOT auto shift problem(?)
2008 Base Auto - 33000 miles. Cruising at 70mph today - floored it. Trans shifted to 2nd and reved to about 5500 - would not upshift (and ergo accelerate) until I let up on the throttle. Works fine with "more normal" half throttle downshifts. Some threads seem to indicate potential leaking seals - others say this is due to tire spin (at 70mph?)
Anyone having similar symptoms?
Anyone having similar symptoms?
Race Director
Joined: Dec 2005
Posts: 11,799
Likes: 106
From: God's Country, ID
2008 Base Auto - 33000 miles. Cruising at 70mph today - floored it. Trans shifted to 2nd and reved to about 5500 - would not upshift (and ergo accelerate) until I let up on the throttle. Works fine with "more normal" half throttle downshifts. Some threads seem to indicate potential leaking seals - others say this is due to tire spin (at 70mph?)
Anyone having similar symptoms?
Anyone having similar symptoms?
It's one of the reasons I always drive with the paddle shifters.
Team Owner
Joined: Sep 2000
Posts: 24,953
Likes: 2,668
From: Far NW 'burbs of Chicago
St. Jude Donor '13
Our 2009 A6 is now at 39k miles, and we've never had a problem with upshifting unless the rear wheels were spinning or the car had hit the rev limiter (only in paddle mode).
Race Director
Joined: Dec 2005
Posts: 11,799
Likes: 106
From: God's Country, ID
In his case it went from whatever gear he was in to 2nd gear at 70mph!
Its happened to me more than once. That is why I don't trust the computer to choose a gear for me when I want to downshift. I always use the paddles to avoid a possible over-rev.
Team Owner
Joined: Sep 2000
Posts: 24,953
Likes: 2,668
From: Far NW 'burbs of Chicago
St. Jude Donor '13
Good point.
We've never had the tranny select a "wrong" gear, bur sometimes it needs to upshift pretty soon after the downshift.
We've never had it act like the trans went into neutral and just let the engine rev freely, but others have reported that issue.
We are quite happy with tranny in our 2009 A6, but the 2006 A6 we had previously was not quite so good.
We've never had the tranny select a "wrong" gear, bur sometimes it needs to upshift pretty soon after the downshift.
We've never had it act like the trans went into neutral and just let the engine rev freely, but others have reported that issue.
We are quite happy with tranny in our 2009 A6, but the 2006 A6 we had previously was not quite so good.
Burning Brakes
Joined: Nov 2011
Posts: 795
Likes: 1
From: tacoma wa
hmmm, I dont know! were you scared to red line it? in sport mode mine will shift into second at 65 mph then rev to 6600 rpm and shift into third at 76 mph. try it again and hold it on the wood till it shifts. in D mode it will shift into 3rd at 71 mph. "note the rev limit in 3, 4, 5, 6 is 6500 rpm"
Team Owner
Joined: Sep 1999
Posts: 41,732
Likes: 1,717
From: Springfield MO
hmmm, I dont know! were you scared to red line it? in sport mode mine will shift into second at 65 mph then rev to 6600 rpm and shift into third at 76 mph. try it again and hold it on the wood till it shifts. in D mode it will shift into 3rd at 71 mph. "note the rev limit in 3, 4, 5, 6 is 6500 rpm"
If you have the 2.56 rear gear, then the shift points at 6500 RPM would be...
1st---50 MPH
2nd---90 MPH
3rd--132 MPH
4th--176 MPH
If you have the 2.73 rear gear, shifting at 6500 RPM...
1st---47 MPH
2nd---80 MPH
3rd--124 MPH
4th--165 MPH.
Thread Starter
Instructor
Joined: Dec 2007
Posts: 101
Likes: 0
hmmm, I dont know! were you scared to red line it? in sport mode mine will shift into second at 65 mph then rev to 6600 rpm and shift into third at 76 mph. try it again and hold it on the wood till it shifts. in D mode it will shift into 3rd at 71 mph. "note the rev limit in 3, 4, 5, 6 is 6500 rpm"
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Burning Brakes
Joined: Nov 2011
Posts: 795
Likes: 1
From: tacoma wa
yes i pulled the numbers from the ECM with efi live. stuff happens too fast to be looking and writing it down, LOL
i cant give you a big detailed note about HP and TQ vs. shift points. it is in my head but i cant articulate it.
your right the engine will be in the fat part of the tq curve at 4500 rpm, but it will bog down if you try to short shift it.
so my point is if your trying to go from point A to point B as quickly as possible. letting the computer shift for you will get you there first every time.
any yes it will spin the tires at 70 mph on a cold road.
my advise to you is to enjoy your car! but seriously! try it! floor it at 60-65 mph and hold on! "dry road"
i cant give you a big detailed note about HP and TQ vs. shift points. it is in my head but i cant articulate it.
your right the engine will be in the fat part of the tq curve at 4500 rpm, but it will bog down if you try to short shift it.
so my point is if your trying to go from point A to point B as quickly as possible. letting the computer shift for you will get you there first every time.
any yes it will spin the tires at 70 mph on a cold road.
my advise to you is to enjoy your car! but seriously! try it! floor it at 60-65 mph and hold on! "dry road"
