maddog20

When I boost I goto .7 BAR back to .6 and hold steady in third gear.2nd gear I goto .6 and hold steady maybe drop slightly. I have tried to adjust this with a hallman boost controller but no luck. Searched for boost leaks none found. Has any Greddy turbo owners expericed this? Any suggestions?
Thanks

ITR41

mine did that on the stock wastegate settings but I put on a Profec-B and it holds at 11psi on the nose. I think it is the way the wastegate is set up from greddy

Jefnes

Where it signal line to the wastegate connected to?

If its connected right to the compressor housing then THIS is the
cause of your 'apparent' loss of boost. The smaller the intake piping you
have the worse this condition is. Take a look at the stock eclipse plumbing
its like 1.5" ID with several HARD 90deg bends...HORRIBLE.

Explanation: What you are seeing is the pressure loss across your intake system.
The grater the flow, the greater the loss. i.e. pressure seems to drop as rpms
go up.

Fix: Change the 'reference' point that wastegate is connected to. i.e. plug the hose
connection off the compressor housing and run the wastegate line to the maniflold.
Now the wasgeate will keep the MANIFOLD pressure constant. The compressor
outlet pressure will rise to compensate for the head loss of the intake system.

Understand?

Jeffrey Atwood

maddog20

So your Profec B helped? I thought a MBCs usually work better to combat these problems over EBCs? I'd hate to spend the money on that and it not work.

chri5

It sounds to me that the .7bar is more of a boost spike issue, and your actual boost setting with your mbc is .6 or slightly less...

maddog20

Jefness I have tried that. It seems to hold boost better then when it was connected to the compressor but it still doesn't hold the boost dead on .7Bar?

maddog20

Bump

94dxt

so does connection the WG to the manifold help hold boost better? makes sense

maddog20

Yes this method holds boost better. I also shortened the actuator arm by 1 turn.