I've been having a few problems with my LET when on boost.
With the Amal Valve connected it wont boost above 10PSI. At 10PSI there's hesitation and the fueling goes lean, like its being cut or throttled back. If I connect the vacuum hose from the turbo to the actuator it boosts fine and fuels correctly.
Originially I thought it was a fueling problem but I've replaced the injectors and pump/filter. There is a problem when the fuel is low as it happens more often but this is overcome when I have more than 1/3 tank.
So, the Amal valve seems to pulse at 10PSI for some reason. No ECU light.
I was thinking about a MBC but I'd like to fix the Amal valve problem first so I know there are no other hidden problems.
I've tried 2 Amal Valves. Currently running Evo5 chips.