Ok, so I know its fine for my blowoff valve to leak at idle because I am running speed density.
I also know you are supposed to adjust your valve just as tight as is needed to keep it closed at idle. Any tighter and you run into surging/trailer hitching.
Now, with my Forge, it leaks(more like hair dryer on cold) at idle.
So I toss in the yellow(second strongest) spring in there. Less air but it still leaks. As soon as you snap the throttle it closes, no problem, but it leaks at idle. Maybe not a hair dryer now, but still quite a volume of air.
So I put in a couple of shims. Same thing.
Then I put in the red spring. Its pretty stiff, almost up to a crappy valve spring. Strong. STILL getting air at idle. Less, its harder to detect, but its definately still there.
So I take it apart while its running. I see that the engine vacuum is sucking the piston upwards into the "hat" part of the valve, as its supposed to, even with the red spring in there(wow, actually). And when its sucked fully up to the top, it can't block off the port into the intercooler pipe, so of course it leaks.
Anyone come across this before and/or know what to do?