Service over the weekend, checked the intercooler fan operation and notice there is a fair amount of air spill out thru the gap between the intercooler shroud and the intercooler.
So manufactured a rubber seal and installed, removed the fan and took GU for a run.
Interesting.... EGT's were approx. 30 degrees lower than when the fan was installed.
2004 DI fan installed EGT 290-300 @ 10 psi boost @ 100 kph.
Fan removed and seal fitted EGT 250-260 @ 8-9 psi @ 100 kph.
Interesting.... maybe the fan was a restriction or the intercooler, thru the fins airflow rate is such that with a gap air just spills out thru the gaps. Sealing the gap forces more cooling air thru the intercooler finning.
Now to see results while towing a caravan.
Now to add some vortex generators and see if further ran air makes much of a difference.
My 2 bobs worth