Chip is correct - I am trying to understand the subject as well as I can (albeit I accept that this may be a lengthy an tiresome process for others!!! )

Nonetheless, your input is appreciated, Phil.

Chip

Thanks for the description on the duration and the lift - this kind of makes sense now. This kind of also explains why often when people put different camshafts in their cars, they end up with a rather lumpy idle and low end performance!

So also, the idea of increasing the lift causing additional stress is usefully explained.

Lets come back to the Compressor Map. To be honest I dont know. If I had to hazard a guess, this would relate to the shape of the boost that is created by a turbo. Presumably you would need this data before you could map the car at all? I believe we did touch on this the other day when chatting about the cheaper turbos that do not come with that kind of data....

Is this correct? PErhaps someone has a sample sheet that I could see?

JJ