Is it actually possible to just turn up the boost ?.......Do these chips not have a built in failsafe to stop overboosting, e.g my own 4x4 saf has a stage 1 chip of unknown origin and the car has run 1 bar boost for the 4 years i've owned it, However , a problem early on with the amal valve led us to fit a bleed valve as a temporary measure whilst waiting for a new amal, as you know adjusting the bleed valve up or down allows adjustment of the boost setting but what we found interesting was that the chip would not let the boost go above 18 psi. Infact when the boost kicked in and 18 psi was reached the chip cut power to the engine altogether, very much like hitting a rev limiter, Quite violent and the first time it happened pretty unnerving, indeed i had visions at the time of all sorts of mechanical mayhem going on under the bonnet. Needless to say when the new amal arrived the bleed valve was removed and the boost was set correctly by way of the actuator. Obviously no long term damage was done because that was nearly 4 years ago and the car has been fine ever since, but as a result i have always assumed that these chips had safety protocols written in to them to provide a safe boost limit and protect engine internals from lean running and piston melt-down. Am i right or am i wrong ?