After all the time spent designing, welding, prototyping, and fitting, we were more than anxious to test the cooler and see if all our work would pay off.
Testing wouldn't be easy though. The weather outside was growing colder every day, and cold is the enemy when you're trying to push the limits of a heat exchanger. Nevertheless, on-road testing would yield the most relevant results for our customers, so we had to try. We hitched a trailer to our 5.9L Cummins volunteer truck, loaded our 6.7L Powerstroke, and hit the road. Temperature sensors in the inlet and outlet of the transmission cooler would let us know when we had maxed out the cooling potential of the stock cooler. Once the inlet and outlet temperatures leveled out, we could record the final temperature and swap in our cooler to repeat the test. But the temps never leveled out.