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Regarding the question about EBP to boost ratio, like so many other things, it depends. Also, should point out that is a different question than absolute EBP or boost, as those are typically mechanical limits.
Essentially, the question is about pumping efficiency and net air flow. As the EPC becomes relatively larger than boost, there are times during the overlap of camshaft exhaust and intake events when backflow can occur. This becomes more of an issue as overlap increases. OE diesel camshafts have little overlap, so the ratio is not as critical. Competition diesels may have greater overlap, due to longer event durations. In this case, the ratio is more critical, but often other modifications on the exhaust side including turbine sizing etc. keep it in check and lower.
I have struggled to get specifications on the camshaft in our engines. IF ANYONE CAN GET ME CAMSHAFT SPECS, I can provide a more detailed and specific answer.
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