Dsg 2-3 shift hesitation

[s4boost]

sorry to bring this back to life, but is this 2-3 shift hesitation common? Does the apr dl501 tune remedy it?


http://www.audizine.com/forum/showth...=1#post7424679

[AudBoost]

I can't say it's common but my 2011 Stage 1 with DSG tune does this on shifts at WOT. You have a 2012 which should have a Gen 1.5 DL501 so the hardware should be better than the Gen 1 in my car. But since you are stage 2 the added torque might be the cause for the momentary hesitation which is more than likely the clutches slightly slipping as they engage.

From Arin @APR
"Now, there are some differences between the years that I should point out:

2010 & 2011 have lower gearing, and can't close the clutches as hard or as fast as the later cars. That leads to less ability to fast shift and launch control not being as aggressive as the later ones.
2012 has the low gearing of the 2010/11 cars, but has better hardware and can grab harder/faster. It fast shifts like the 2010/11, but the launch control grabs harder.
2013/2014 have higher gearing, and the best grab, giving them the best fast shift and the best launch control.

In short, the 2010 and 2011 transmissions are the least beefy and least "grabby" of all of them. They made the transmission better in 2012 and really nailed it in 2013.

[shoe3k]

I can't say it's common but my 2011 Stage 1 with DSG tune does this on shifts at WOT. You have a 2012 which should have a Gen 1.5 DL501 so the hardware should be better than the Gen 1 in my car. But since you are stage 2 the added torque might be the cause for the momentary hesitation which is more than likely the clutches slightly slipping as they engage.

There are cars that do this stock like mine. It is pretty consistent on my car from 2->3 and 3->4 where it will shift, delay, drop 100-200 RPM before resuming acceleration when going WOT. I'm not sure why some think it is some sort of clutch slippage because if it was the engine's RPMs would climb quickly just like a traditional manual having issues with its clutch. I honestly think that the the ECU is doing something with the throttle that lets the RPM drop since it happens very fast with great consistency. I'm not sure if there is some sort of expected engine RPM that the ECU wants to see on each shift.

[cspcrx]

Check out the thread in this form on this very topic. It appears APR and GIAC are having this issue. They are working on it and it sounds like it may be do to Audis update.

[AudBoost]

There are cars that do this stock like mine. It is pretty consistent on my car from 2->3 and 3->4 where it will shift, delay, drop 100-200 RPM before resuming acceleration when going WOT. I'm not sure why some think it is some sort of clutch slippage because if it was the engine's RPMs would climb quickly just like a traditional manual having issues with its clutch. I honestly think that the the ECU is doing something with the throttle that lets the RPM drop since it happens very fast with great consistency. I'm not sure if there is some sort of expected engine RPM that the ECU wants to see on each shift.

I see what you are saying but I still think it has to do with the clutch(es) slipping slightly. Watch the video again and you'll see when the car changes from 2->3 the rpms hold for a split second and then drop. If the DSG was looking for a specific RPM than it would wait for the RPMs to hit that number before engaging the next gear. What looks like is happening is that the DSG engages the gear, senses slippage, reduces the torque by allowing the RPMs to drop allowing the clutch to fully engage. In a traditional manual it is up to the drive to reduce slippage caused by torque. A human is too slow to react so that's why the RPMs climb in a manual. Every time I have experienced slippage with a manual my first instinct is to let off the gas not keep my foot down until it grabs.

[s4boost]

I see what you are saying but I still think it has to do with the clutch(es) slipping slightly. Watch the video again and you'll see when the car changes from 2->3 the rpms hold for a split second and then drop. If the DSG was looking for a specific RPM than it would wait for the RPMs to hit that number before engaging the next gear. What looks like is happening is that the DSG engages the gear, senses slippage, reduces the torque by allowing the RPMs to drop allowing the clutch to fully engage. In a traditional manual it is up to the drive to reduce slippage caused by torque. A human is too slow to react so that's why the RPMs climb in a manual. Every time I have experienced slippage with a manual my first instinct is to let off the gas not keep my foot down until it grabs.

Unfortunately I agree. This seems to happen more often in manual mode allowing the transmission to shift itself(no paddles) and like the car was anticipating you shift, and then you didn't. And then it's like "oh sh*t, I gotta do this part" and then it shifts and is just 100-200 Rpms off. The fact that you can hear a change in the sound of the engine as the revs come down is the concerning part. Is it just roasting the clutch? Or is it cutting throttle? If it's roasting the clutch that's no good. The latter would be fine.

[jran76]

My car did not do it stock (at least that I noticed), but definitely has a slight hesitation with the APR DSG software. I posted the below in another thread, but here it is here....
-------------------

Here is a video of my slight hangup:


And a shot of the log file:



Other than the slight hangup, everything works great. I've only seen it on the 2-3 shift pretty consistently, but I haven't been to the strip yet to see what happens in higher gears.

[shoe3k]

My car did not do it stock (at least that I noticed), but definitely has a slight hesitation with the APR DSG software. I posted the below in another thread, but here it is here....
-------------------

Here is a video of my slight hangup:



Other than the slight hangup, everything works great. I've only seen it on the 2-3 shift pretty consistently, but I haven't been to the strip yet to see what happens in higher gears.

That is not the issue we are having and that seems like an issue with the flash. In your video the car seemed confused towards redline.







Watch this video in this thread starting at 13 seconds, which demonstrates the exact symptom by many:

http://www.audizine.com/forum/showth...=1#post7424679

The problem here is that the car will shift, do a quick pause, drop 100 RPM, and then continue normal acceleration. The symptom is very consistent and is pretty seamless if not for that pause after the shift. I can reproduce it going 2nd to 3rd and 3rd to 4th consistently in manual mode with the car shifting at redline, S mode, or manual with me using paddles. One interesting aspect of all this is if I go WOT from 1st gear and shortshift under 4500rpm in all gears the problem never appears. My car is 100% stock with 8700 miles, so I will be taking it to the dealer to show them the issue and see what is causing that 100 RPM discrepancy.

[cshocker]

Is this considered slipping or hesitation?

It's a lot worse when it's cold. No codes per VAG COM

https://youtu.be/_PRyj3iTmzE

[harrisonk8]

Sorry for bringing this back. I've been having this issues since Audi replaced my mech unit. Also getting a low speed shudder on 2nd gear. I am wondering if it might be fluid related. I doubt Audi checks the fluid level properly.