‘Juices’ is a kind of slangy term that means ‘a person’s vitality or creative faculties’. The creative faculties are of course what is referenced in the expression mentioned in the question linked to by jwpat7 in the comment above; in this case, it’s the other meaning we’re looking for.
Since a person’s vitality is seen here as a kind of ‘juice’ (originally most likely referring on some level to bodily fluids: especially blood was, in Mediaeval times, often considered to be a source of energy, health, and vitality in humans), it makes sense that it should be set ‘flowing’, since that’s what liquids do.
This meaning is extended from the meaning the OED has as sense 2:
The fluid part or moisture of an animal body or substance; now usually in pl. the various liquid constituents of the body, the bodily ‘humours’
Obviously, if you think of it as being ultimately just a kind of euphemism for blood (and sweat and bile and all the other humours), getting it to flow, and flow faster especially, would be a sign of physical exertion or excitement: when we run, our blood actually flows faster, and our pulse increases.
The phrase is often also used in a sexual manner, where the reference is to the various kinds of sex-related bodily fluids that are released when people become aroused. Whether the sexual meaning came first or the exertion meaning came first (or whether they are really to be separated at all), I do not know; I cannot find any quotes for that. But it is clear that they are both in use.
In the quote from your NYT article, the meaning is definitely that of physical exertion–based excitement. He is comparing the ‘rush’ he gets from driving to a kind of race where he’s not going to let anyone pass him and be faster than him.
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