[PLexo50]

I apologize for the long and boring post but I do need some help from you smarter fellas.

Oh yeah, long time listener, first time caller.

I just bought my 87 turbo! Bought it not running and from what I can see and what the PO has told me, has a lindsey upgrade kit(exactly what, I'm not sure). From what I can see, it has a lindsey wastegate(not sure of single or dual port), chip, boost gauge(autometer), a/f meter(autometer), aftermarket fuel pressure regulator). So after replacing the alternator the car runs and drives, and low-load driving and idle seems fine(idle speed is kind of high comparing to specifications 9-1000rpm warm).

My problem occurs under heavy load. Seldom in first, mostly in gears 2-5, it'll spike past 20psi(autometer gauge), and exhibit what feels like a overboost cutout. If I modulate the throttle at any speed and maintain below 18psi, the car pulls very well with no abnormalities. Some things to note during the alternator replacement: it appears the banjo bolt on the intercooler pipe has a vacuum line that runs the length of the manifold and ends up at a T on the firewall, which one end runs to the wastegate and doesn't look installed. Which I assume would explain why the boost pressure doesn't change no matter how many times or direction I turn the adjustment knob. Now I'll have to double check which WG I actually have and if the vacuum hose is connected(it's too cold right now), but I'm just stating what I can see at this point.

1) Would anybody know the specified boost range for said aftermarket parts?
2) What and where is the cycling valve and if possible resource a vacuum diagram?
3) Does the lindsey wastegate have a default(spring) pressure it opens at or is it dependent on the single vs dual port configuration?

It's late, I'm tired, nice to meet ya'll!