is there some sort of safety feature to prevent from high levels off boost being run whilst the engine is still coldish.

Its just after about 3 miles the temp. guage is in middle , so nice and warm, but when put foot flat on floor the engine kind on dies and i end up shooting forward on to the steering wheel. This has happened 3 times now and seemed to be the same feeling as when I tried turnibg the boost up to about 18psi for go.

Is it just the injectors running out or something else?

well a car with boost solenoids connected will run in safety boost until at working temperature.

If the boost is on a contorller though i dont know, unless the fuel map is different at low temperature?

Are you sure Clarkey or is that a theory ? It certainly wasn't the case on mine.

Std car will run in safety boost until warmed up. If it doesn't happen at other times it's not likely to be injectors etc. 3 miles is not necessarily long enough to warm everything up. Temp guage is wildly innacurate and in the centre position covers a range from lukewarm to very hot. Try leaving it a bit longer before you boost. Costs nothing but patience.

With most chips the car is in standard boost until 60 deg C, the the boost solenoid control valves are enabled allowing the boost to be raised to 9.5psi (or above depending on how you've frigged it). If the BSCV's are disconnected, with say a boost controller, then I presume you can hammer it from cold without knowing.