megan manifold lowered my boost?

[pearlS13]

hey guys i just recently installed a megan racing manifold on my s13 and noticed my boost actually dropped a little? I was boosting around 14psi with the stock manifold and now im down to about 12-12.5ish psi.Is this normal?I also have a hks wastegate actuator and its been so long since i have adjusted it i forgot what way to turn to increase boost? Is it clockwise or counterclockwise?

thanks.

[nzmoman]

i wouldnt change the boost until I know why the pressure dropped!

[pearlS13]

my theory is since the new manifold has less restriction especially in the collector area the pressure would drop a little. I don't know if this makes sense or not?

[91RMKS13]

It might have changed because you put on the new manifold.

[ser2102]

maybe you have an exhaust leak? id double check the torque on the bolts.

[pearlS13]

There is no exhaust leak, you would clearly hear it if it was leaking from the head or the turbo gasket.

[wildacexxx]

this happened to me when i went from a 1 piece aluminum hotpipe back to the stock one. i was boosting almost 8 psi now the most i boost is lik 6

[dustyk]

It's normal for your boost to go down if you changed your manifold.

You should have less backpressure so the boost should go down slightly, I had the same issue when I swapped the manifold, I had to slightly change my boost controller settings to get the same boost.

Also with the HKS actuator, shortening the rod makes the boost go higher.