[schwap]

In N.A. generally that is referred to as an "engine dyno", and what's known in the UK and other colonies as a "rolling road" is a "chassis dyno".

[evm9]

I've never heard any term except dyno (or dynamometer), but I much prefer those terms simply because it's more apparent to someone that doesn't have an understanding of engine & car testing.

I'm a fan of names that give insight into what the thing/product/service/company actually does.