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YOUR RESEARCHTiptronic "clunk" 2nd to 1st at various RPMs.
Leading reported evidence
Replace mount, and the clunk went away
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My dad's o2 tip did this, it was under cpo warranty, they replaced the mount, and the clunk went away.
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Suggestion
This is not really a problem with the transmission or the software - as someone else noted, there is almost no reason to ever shift from 2 to 1 while moving at any speed, rather, you should do it just before stopping if you plan to use 1st when you accelerate.
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Suggestion
No real need to use engine compression to brake anyway, unless coming in too hot down a steep ramp or something like that...
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Suggestion
This is not really a problem with the transmission or the software - as someone else noted, there is almost no reason to ever shift from 2 to 1 while moving at any speed, rather, you should do it just before stopping if you plan to use 1st when you accelerate.
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I searched old threads and only found one from 2004 that discussed this issue in 996 tiptronics. I have a low mileage 02 Targa with tip. Bought used in December and now have finally driven it a couple of thousand miles (won't do this much normally but drove it to/from 500+ miles biz locations for the thrill in 1st month of ownership). What I've noticed is a very sensitive transmission to the speed at which you downshift manually from 2 to 1. I drive around town in manual always and from a stop choose to "launch" from 1st vs. 2nd as I love the wind-out "note" and keep it in gear longer than A would. So, you have to downshift at some point. I'm finding at ~2K RPM the transmission will easily move into 1st with no vibration and no "clunk"... but at ~2500 RPM you will get a clunk in the xmission. Also when one is nearly stopped or very low RPM you can also get a "clunk" and resulting vibration. Non-issue at any other RPM with any other gear 3 to 2, 4 to 3, 5 to 4. So questions:
1. Normal yes/no?
2. is clunk indicative of other xmission issues?
3. surely not, but any relationship to RMS problems? (car has no RMS history 25K miles to date)
4. Is this causing extraordinary wear on xmission?
5. Have 2 yr/50K CPO warranty.. take it in and ask dealer to check it out?
Thanks for any input/suggestions on above. 40+ days of ownership and Love the vehicle.. a lot of fun to drive and constant head turning with the Targa roof from SUV's and taller vehicles that I pass or when they pass me! Should have done this many moons ago.
1. No (except perhaps when the engine/transmission is cold, i.e. not up to operating temperatures)
2. Perhaps a mismatch between ECU and TCU F/W revisions (yes, I know, you've heard that one before, but don't mention the vehicle, please)
3. No
4. Yes
5. Yes, as long as you can replicate it. Ask to take them for a test drive.
BTW, yes, I did ask the 'dead guy', but only because it was you.
I am not sure I understand. Are you saying that you are going 2000 RPM in second gear and manually shifting into first? In driving a stick, do you normally shift into first? I hope not. Shifting into first is really designed to launching a car from a stopped position. If you are moving, you should not need to shift into first.
RMS usually does not happen in a Tip.
If you are at ~2500 RPM in second, placing it into 1st, you are trying to force the engine into a good 4000+ RPM range
instantly
.
Your clunk in the sudden jarring of all the components finally mashing the transmission mounts. Your mount is probably shot, they die a lot in these cars.
I wouldnt be doing what you are doing anyways, kinda hard on the trans unless you mash the throttle a little to take the load off of it.
I bet your motor mounts (or at least one) are shot. My dad's o2 tip did this, it was under cpo warranty, they replaced the mount, and the clunk went away. also, you really shouldn't shift it to first until the vehcile speed is pretty slow. Good luck.
It does exist, but the number are less because tiptronic gearboxes have a better support of the driveshaft, so there is less vibration. Not due to the number of tips vs manuals.
With the introduction of 3.6l engines, GETRAG added a third bearing to the driveshaft to reduce these vibrations.
Why not just let it "auto-shift" down to 2nd, then click it into 1st once completely stopped? That's what I do w/ no issues.
No real need to use engine compression to brake anyway, unless coming in too hot down a steep ramp or something like that...
never shift into 1st unless you are standing still...I know what you are talking about..sometimes I make the mistake to shift into 1st while rolling to a standstill (in manual) and it is like shifting a regular stick into first gear and letting the clutch come up....I wouldn't call it a clunck though..
I have had an '02 C2 with tiptronic for more than 5 years and I can say that achieving a smooth 2 to 1 shift is an artform - the transmission will not do this all by itself. Even when new my transmission would make a very slight "clunk" if I shifted from 2 to 1 at a standstill. The clunk is even worse if shifting from a relatively high RPM in 2 (like the 2000 RPM mentioned). I have noted that getting a smooth 2 to 1 shift can only be achieved when your foot is on the brake and the car is just about stopped and in the process of decelerating (say, somewhere between 7 and 2 mph). If the car is coasting I will get a clunk.
This is not really a problem with the transmission or the software - as someone else noted, there is almost no reason to ever shift from 2 to 1 while moving at any speed, rather, you should do it just before stopping if you plan to use 1st when you accelerate. It's a skill you need to acquire just like learing to heel & toe or properly shift a manual transmission. And by the way, very few people can achieve a totally smooth 2 to 1 shift with a manual trans, so why should an automatic be any smoother?
"I are an engineer" and this post was philosophical and also one of concern. I can understand lurching, tire skid etc. but the clunk seemed a bit odd. However upon reflection and reading the various comments, I would agree with many, if not all, of the comments on limiting or eliminating 2 to 1 shifts. I've found even switching to 1st at a stop or nearly stopped it can clunk. guess I was trying to find the optimum RPM or point where there would be no clunk at all. Doubt it is the mounts but could be. Lastly, the best advice is to just come to a stop and let RPM's get to 0 and then change. Grazie amicos.
My tippy used to clunk when downshifting from 2nd to 1st when at a standstill. The issue ended up being failure of the tranny mount...... Just my 2 cents
They all do this to some extent - another tip idiosyncracy...
Best advice is don't downshift to first unless you're stopped.
I had a G35 which acted the same way, however it always started in first and would always automatically downshift to first smoothly. My current Beemer is always smooth proving a properly developed tranny can operate that way!
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