I think 160 is possible with a good babylon start. I'm playing a "bad" babylon start, and despite a number of screw ups I should have the tech tree completed by t170. This was bad in the sense of: no faith generation. I had to send one of my settlers far far away to pick up Uluru and get 4th religion... Not ideal. But I needed more practice at quick anyway so I decided to play through. By end game I was only be able to faith purchase 1 GS. Better faith *alone* would have allowed me to finish the tech tree by 160. Secondly, two neighbor AI went insane with prophets like I've never seen, fighting over my cities with 4 prophets, converting them every turn. This took away my swords into plowshares belief in three of my cities including my capital for most of the game. Also they don't update the text for quick: it's 66 gold when a city converts, not 100.
Anyway, I wasn't able to rush buy most science buildings, so I think that also added like 10 turns. Plus, I had to remote settle to get aluminum. So, in conclusion, I think 160 is quite possible on a better map. I'm fairly certain I'll finish around then on my next start.
I do agree that winning by t130 is unrealistic. The game doesn't scale. For one thing, combat, scouting and anything else movement related slows things down. Even just the turns lost moving settlers into position is huge. Spain's advantage with free settler (or two) is gigantic because of this, but you're talking a LOT of re-rolling for that...
But also, you can't get as fast a start in general. CS quests to kill barbs take longer, and that hurts too. There are tons of reasons it doesn't scale, but I think the record with a lucky Spain start would be 140, whereas 210 isn't even a record on standard... Anyway.
EDIT: Wow, totally blew the end of that game. Made so many mistakes in the last few turns that I added ten more turns due to misclicks and accidents. The final insult: I didn't see the missionary standing on my railroad 1 tile from my capital, and so when I selected my capital as the destination for my spaceship part, the game helpfully re-routed my spaceship part around the missionary, across a river. It took 2 turns to get back across the river and add the part.
Oh well, it was a test playthrough anyway. But still. ARGH
