Greddy Profec B Spec 2 - Overboosting???

[Will.]

Hi guys, recently had my Gredd Profec B 2 Boost Controler installed on my S15, I had a mechanic punch in the settings and I set the limit to 12 PSI, When i take it for a good fang on the straight, it overboosts to 13 - 14 psi??? whys that? I set the limit to 12 PSI for a reason...


what could be the problem?

 

[drifter]

Does it hold that boost or is it just a spike and then settles down? If it stays high, drop the "set" value, if it's a spike drop the "gain" value and try again. The "set gain" can also causes spikes if it's too high so try that if the first 2 don't work