Rad cap might have had it just be safe and change it, if not you could actually be over heating so might be worth swapping out to a fresh alloy radiator
Just out of interest how much for kit, because genuine said turbo kits are rrare. No point in even offering a big turbo like that up to a standard engine anyway, far to old school and large for the little glanza engine
Shame to hear but at least it's sorted now,I did try will when I was weighing up my mapping options like him and racetech seemed like they didn't have the time. Of day to speak to me so I left it with the great lads at td. I did see it ripping up at japfest2 sounded epic!
Definitely something wrong, mine used to start on point in winter times back when it was loved lol, I'd start by checking ignition components and fuel system