Howdy,

I got my rs turbo set up with std boost/ignition timing etc

It boosted to 7psi, and ran perfect!

few months later, i noticed it boosted to 12psi? it did hesitate if you put your foot to the floor, but if you do it slowly it boosted fine, no hesitation probs.
Took it out not long ago, was fine, still boosting to 12psi, but no miss-fire?

it kinda goes like:

d-d-d-d-*pop*(from exhaust)

new fuel tank wasnt exactly mint inside, plug leads are shite, new plugs, dizzy im not sure what nick it is in.

Just wondering really what reason it would suddenly decide to hit 12psi? ive no bleed valve, piped up via amal valve, im sure it has a turbosystems chip, any ideas? and am i right in thinking it will be fine (ign timing/fueling) if it hits 12psi and IS infact chipped? (didnt hit overboost so i assume it is?)