Compressor Maps and Surge Limit
Ok so I've been trying to learn a lot about turbos ever since coming here and seeing the Quicktime kit. I pretty much have the idea of most of the stuff down except for the compressor maps/surge limit.
I plotted my "points" on a compressor map to a T76 turbo and came out with great efficiency at ~10psi from around 4500-6000rpm which I'm thinking will be my operating range. It stays on the right side of the surge line till around 2500rpm and lower, and I imagine I would be cruising the freeway at around 1500-2000rpm.
So my question is do I have to be on the right side of the surge line at all times even though I won't be into boost at that RPM?
Also I think a T76 seems a bit on the big side for what kind of numbers I'm looking to run (ie stock block 302, ~500 or less) but I decided on the T76 purely from the efficiency range of the turbo and where I am wanting to run it. Would it be better to go with a smaller turbo even though the efficiency range isn't as good.
If info is needed on my combo, I can add that too. As of right now my numbers are 290hp 315ft-lbs.