Finally getting started now that it is warmer

pishta said

Could you drill a tapped hole into the PV restriction area and screw in an idle screw to alter the PVCR area? Not looking at mine but I drilled mine out to .076 and perhaps I went a little overboard. I can always plug and redrill but adjustability would be very cool with a wideband O2. With a fixed PVCR hole you could adjust with the wastegate..too rich, just add a few PSI!

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There are a few companies that make jetted ones, but the "jet" is tiny. The adjusting screw is an interesting idea, but not sure how that could be accomplished because it's all internal.

The issue with going too big is that it will run way too rich right when the power valve opens then and only get a little better on the top with boost. The idea is that even though the hole is a set size, pressure increases with boost, therefore flow should also increase. So just adding boost isn't really the answer.
What I noticed is that it only works that to a certain extent. It's the whole transition from vacuum to boost that seems to be a problem area... I am in no way an expert, just stating what I've noticed on my car and remembering some of what I've read.
There's just a lot of testing / tuning involved with balancing main jet size, power valve restriction size and power valve open time based on driving conditions.

Go too big on the power valve and it'll bog just before boost comes in ...that's what mine was doing and I had to close off one of the ports cause I apparently went WAYY too big...lol