know anyone at what speed or what rmb the 2nd turbo start working?
Think it\'s around 4K 4.5K rpm mark
Dont quote me on that though i\'m not too much of a tech head lol
The second turbo kicks in @4.5k.
yeah first turbo starts pretty much from word go 2500rpm+ & 2nd kicks in from 4500rpm on which is where standard boost pattern goes from .8 to .6 back to .8 bar as i recall......

Si
more or less, yeah! :p
geberally it kicks in at 4.5k, as long as sufficient pressure has been realised by the 1st turbo. You\'ll find a slight drop in power as it starts spooling then at about 4.8k Hold well tight and pray.