Interesting differences in EGT's, I can only get max 14 psi atm but have something to try soon so hopefully can get the boost up a bit more, when we went from Yarrawonga to Echuca along the Murray Valley highway recently with outside temps around 32c with a very strong head and side wind with camping gear and a couple swags and chairs on the roof we were sitting around 415c EGT's @ 100k's and nearly touched 500c when overtaking, that road was a EGT killer, normally we can range from 350-360c @100K's and funnily enough when getting to 110K's the EGT's can go down to 325c pending weather temp but normally sit 15-20c lower at 110k than 100.
As soon as it cooled down a bit heading towards Melbourne (same day and about 30c around there instead of 32c) the EGT's dropped back to around 385c and then in the evening was back down to 365c as we headed towards the Valley(home).
Conclusion was ambient temperature can and does affect EGT's(in our vehicle), add other variables like head winds/side winds and affects it even more.
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