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I think you may have your terminology mixed. Overboost suggests (for example), if you have your dawes set at 14psi, when you accelerate you 'overboost' and hit 16/18 psi before it settles at 14. When limp mode happens you will have max 10psi with virtually no acceleration until you lift off the throttle then power will return.
Limp mode in my experience is a combination of too high MAF voltage and/or too high boost. If you have ECUtalk its easy to see it happen.
Overboost on the other hand is fine tuning dawes and needle. I still get a slight overboost on mine but I like the quicker spool-up rate With my setup I will 'overboost' to 19/20 under WOT then settle to 17psi.
With my setup I will 'overboost' to 19/20 under WOT then settle to 17psi.
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