I wouldn't be to worried, the DSG is "cooled" (or heated depending) on how you look at it via a coolant loop. The coolant also runs through the engine oil cooler.
What you should be looking at is comparing DSG temp to coolant temps and oil temps, they should all be pretty close. Oil under regen should climb to 220F/104C. I've seen oil temp high as 230-235 on my TSI under heavy acceleration, I'd be guessing the DSG temps would climb to that if I kept romping on it.
The DSG has pretty much zero wear (thus heat generation) except for starting off from a stop as it slips the clutches, shifting and under load heat isn't really being generated.
I will say I think the Golf R has an external oil radiator (not tied into a coolant loop) thats in the fog lamp area. If you want you should be able to source Golf R (or estate) parts and could add additional coolant.
Also where'd you get the bosal tesla adapter, and how much?
From what I've read from other thread,the no.1 reason people suspect VW from banning towing with DSG TDI is the transmission overheating.
That's why I try to monitor everything to see if there's really an issue and also not harm my beloved wagon while doing so.
From what I've find out on the interwebs, 135celcius seem to be the maximum temperature the transmission will tolerate before warning light and decreased torque.
All my towing where less than 50kms (30miles) and my recorded data seem normal:
@31c
Max oil temp: 116c
Max centrifugal clutch temp:108c
Max transmission fluid temp:109c
All these are well under limit.
Even if I'm still a little bit stressed when I tow with my do-not-tow TDI DSG GSW, I'm starting to look more at the road than the gauge and temperature graph and enjoying the ride...
I'm starting to wonder if there is any reason at all.
I mean yeah, I wouldn't try to tow that 2k lbs camper @80mph. But if kept @60mph and under and driven accordingly, I can't find any problems so far.
In 1month, I'm going to Sandbanks Ontario, 500km away.
I'll be monitoring everything again, even with my friend calling me a nerd. Eh.
That will be the ultimate test, my camper will probably be at his heaviest. I'll try to drive it on the scale.
I also ordered airlift bags.
I'll update you guys if anything happens.
...I'll update you also if nothing happen. Eheh