While it is possible to sublimate nylon at low temperatures, there are many types of nylon and they react differently to dyes.
There are some nylon fabrics that are pre-treated with additives to help with dye absorption, and the ones most commonly used in textiles are nylon 6. The latter, nylon 66, can be harder to dye, but it has a higher melting point at 265 C. Nylon 6 has a melting point of 215 C.
There are a lot of mixed reactions online. Some printers claim that nylon will take on a more light vintage print, while some say that it can be even more vibrant that polyester. Some say that dye retention is great after washing while others say there will be transfer. However, there is a tendency for the dye to oxidize in the sunlight, which will fade over time.
So why nylon instead of polyester? It all comes down to what the fabric is being used for. For performance, polyester has better moisture wicking properties and pilling resistance (nylon absorbs more water, stays wet longer, and will impede breathability). The great thing about nylon is that it lasts longer (when dry) and it is much softer, smoother, and stretchier; as silk substitutes, nylon is great for hosiery and knitted garments.
If you believe nylon is still the better option for you, the key is to test, test, test. Each fabric blend must be tested to determine whether it is suitable for printing or not, as well as what temperature and time works best. So for your next sublimation printing project on nylon, let us help! Summer is coming and nylon sublimation is perfect for swimwear!