The car goes into limp mode, limiting you to 5000RPM. At 5000 you don't feel an abrupt stop like it cuts fuel flow, but you know it's not allowing you to accelerate, though. If temps continue to rise you'll see a message in the instrument cluster that says the engine is overheating and power has been reduced to prevent damage. It's an odd message, since the oil temp was fine. You can continue to accelerate if you upshift, but you'll definitely be at a disadvantage.
If I was short shifting and staying above third then it was possible to last the session, though 3/4 of the time I'd overheat after 20-25 minutes.
The transmission is only required because it has the internal pump. If you install the radiator, hoses, and an external pump (which is what I had planned) we should be good. By the sound of it, this guy did just this and it proved out. Thanks.
No worries. Happy to answer questions. Let me give you a bit of insight into my purchase process. When I was looking at the GT350s I actually wanted an R, but they weren't available and were going for exorbitant amounts of money. I decided I could benefit from a back seat anyway and went with a GT350. If you remember, the GT350R had an optional Electronics Package that added the nav and radio back in. That's how I would've gotten the GT350 if I could have, but the Track Package and Technology Package were mutually exclusive for 2015 and 2016.
I've not heard one owner say theirs overheated in the street. Just a bunch of people want free coolers say it's possible to overheat in the street.
