I have bought this model as is without building instructions. So I don't know if this is an original model or a fantasy car. I'm interested whether this is a original LEGO model, which one it is and if there are instructions available to rebuild it / let my son rebuild it.
Inclined to think this is someone's own creation rather than an original LEGO Model.
First hint, I could identify the 2x3 slope with the X on bricklink here: https://www.bricklink.com/v2/catalog/catalogitem.page?P=3298pb016
And this element only seems to be available only in 3 sets, none of which are a blue dragster or even Technic sets for that matter.
Likewise, searching for motor blocks (both types) in sets in trans-clear color also doesn't turn up anything.
There's also quite a bit of a mismatch between the elements in the model... studded Technic, non-studded technic, city elements, old tires, new tires,...
Also, the quality of the build and aesthetics are not up to the level of an actual Lego model in my opinion...