Well not to take away from a P&W tech rep but that is simply not true. Fuel is not being dumped into the can from the very first selection of idle on the mode switch.So there is not 10 secs worth of fuel.
I again go back to my 212 days. If memory serves passing thru 10% ( maybe it was 12) Ng, we rolled the throttles on and waited for light up. I remember flying with a pilot one time who set the throttles to idle and then hit the starter. I was shocked and assumed that we would get a hot start. Nothing out of the ordinary happened, as the Ng went thru about 12% the light up was normal.
So again, I go back to the flow divider and the pressure required to open it.
Geoff.....where are you on this?