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So I did a bunch of research before getting an interceptor gauge and from what I saw the stock map should be able to read 1.5 bar, after hooking up vac looks normal but I’m only getting 3.3lbs of boost then it stops. I removed a conventional boost gauge so I know I’m getting the boost. Any ideas?
If you have a stock LS3 MAP sensor #55573248 then google says it will read from 0-130Kpa.
So not 1.5 bar... 18.8psi LESS atmospheric of 14.7 = 4.1psi boost is all you could hope to read.
Sounds like you are pegging the stock MAP and would need something with higher range capabilities.