For car channels I’m enjoying Cleetus McFarland (https://www.youtube.com/user/GARRETTmitch) and Fasterproms (https://www.youtube.com/user/Fasterproms1) – quite a few of the videos cross over as they both share the same building but something very watchable about a bunch of guys messing with 1000hp cars whilst not taking themselves too seriously.
Tech related has to be Big Clive (https://www.youtube.com/user/bigclivedotcom), pulling apart random cheap / junky electronic stuff, informative but quite funny at times as he has a very dry sense of humour.