Trying to figure out causes that would make the boost "Wavy" in 3rd and 4th gears.. Car seems to hold fine in 1-2.. spins in 1st pretty bad, second seems to hold well at 10psi. When I hit third it starts waving some... might go to 11psi or so.. 4th its pretty bad, I can feel it spiking to 13psi and then back down, up and down.. Im running a TIAL 38mm wastegate controlled by a Greddy profec B spec II. Gain is set to the lowest setting of "5".. Im kind of stumped here. Any ideas to lead me in the right direction?

 

what happens if you increase the GAIN setting. what are your SET and START BOOST settings?

how are the vac lines routed?