Compression Ignition Addict
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Sorry for the science part - just don't "know what you know". Personally, I think you are fine. I assume that your coolant level is about 1/2" below the minimum mark when you are cold? Also assume it is a 50/50 mix (or slightly higher)? I will say that I haven't seen the peak pressures you did, but then again I don't see the grades that you do. Bottom line, Ford set their specs where they are for a reason (ie the cold fill mark, the 221 deg F ECT to defuel the engine, where to initiate the cooling fan on high speed, etc). You were working your engine pretty hard and you didn't puke. That's a good thing.
If you have some restriction in the coolant flow to the EGR cooler (which you might have some, but if so, it isn't enough to worry about yet), then there is a possibility that there is some flash boiling going on in the EGR cooler. This can add some back pressure. Also, keep an eye on the EGT's (if you have a gauge). Sometimes stuck turbo vanes can elevate the EGTs.
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Last edited by bismic; 10-15-2012 at 11:33 AM.