Update: This is officially debunked by Nelson as the quote mentioned below did not come from him.
Yesterday the admin for MB.com, Nelson, verified the group name of the Nascar vehicles (The Wreckers) and revealed that the alt mode of "Einstein" is the blue Mercedes seen in Chicago with the other Transformers vehicles. At the time, he also corrected everyone that the Mercedes Benz is an E550, not E350 and linked to his picture of the car. Same pic I used for the post yesterday (and now today). However, I do not recall seeing the photo title of "Mercedes E550 "Q" on the set Transformers 3 in Chicago, Il" Not saying it was added later, just that didn't pay enough attention to remember if one was there or not. Main point is the title tells us the name of the character is simply "Q".
Could this be a reference to the omniscient god-like character from Star Trek: The Next Generation? Or the legendary Q (for Quartermaster) from the James Bond films that supplied him with all his gadgets along with sage advice as most memorably played by the late great Desmond Llewelyn? According to TFW2005, it is the latter as they posted "His name is "Q." Like in James Bond. -Nelson-” I wasn't able to find where the quote came from (guess via an email) but the flickr account is Nelson's so that verifies the Q name and I don't see Michael Bay (who ultimately approves the names assuming they clear legal) being much of a Star Trek fan so a James Bond homage is likely. I guess Wheeljack didn't get Bay's approval or legal's (Hasbro sadly allowed a lot of their G1 trademarks to lapse and couldn't retrieve all of them) as he was essentially the quartermaster of the Autobots in the G1 cartoons. Thanks to Chris and Jeff for the link.