[Streckfu's951]

Originally posted by sellingporsche
This is a VERY valid point. I elected to go with a HKS EVC (Electronic Valve Controller) aka boost controller which I imagine is the same as the Lindsey unit. If you dont raise the fuel pressure the boost will cut when you boost for long periods of time.

I'm not familiar with the EVC but the LBE is purely mechanical. It uses a ball and spring as a pressure valve. The spring preload (set by screwing the two body peices of the LBE together) determines the boost pressure in which the signal is sent to the CV.

I made that point because some people are tempted to adjust the LBE beyond the stock boost setting without adjusting their fuel. This will result in an overly lean condition which leads to either overboost (what you described) or detontation which will cause the headgasket to fail.