Congratulations Steve - a major milestone accomplished.
A couple things: yes, the increase in airspeed will help : 110k - 150k is about 36%; will be interesting to see if your cooling follows in linear fashion.  Too much pressure in the cowl from an undersized outlet is highly unlikely - to over-pressurise (a balloon or tire) it takes both a sealed inlet and a seal outlet - the cowling will flow as much air as it can; the rest will simply never enter the openings.  On the other hand, if you have leaks into the cowling that are not part of your cooling ducts this DOES increase pressure under the cowling and will work against the low pressure area needed behind your heat exchangers.
Good luck and keep up the posts as you move forward ... Jeff

Hi People

The Glasair has finally left the ground and had a successful first flight.
I've attached a graph of the data. OAT was 63F
I was really very pleased given our smallish 20in2 coolant inlet area and <9in2 oil inlet area for ~190hp.
The temps are a bit hot (~220F) but we didn't go beyond 110 knots. I suspect when we get the airspeed up above 150knots into her nose we'll see some improvement.
My hunch is we might have too much pressure in the cowl. The exit air area is approx. 30in2.

Appreciate any of your thoughts from the first flight data.

Cheers

Steve Izett
Glasair Super II RG Renesis 4 port RD1C EC3 EM3