Hi all,

Have a GC8 with Greddy Profec B Spec II. Boost should go up to 1.5 bar but half the time it will just hit 1 bar and sit there blowing off. Can back off, accelerate again and sometimes will go to 1.5 bar no problem sometimes just back to 1 bar. Happens probably 50% of the time. Might go to 1.5 bar 5 times in a row then only 1 bar etc. Might go just go to 1 bar then 1.5 bar, it is all over the shop.

Any ideas?