I have an FP Black that originally was tuned on a Forge 15lb wga. Boost controller is the Grimmspeed. Car is boosting 25-26 lbs and was experiencing boost creep. Swapped over a FP 25lb wga and right off the bat, the turbo spooled faster but any type of WOT and the boost went sky high. So I swapped back to the Forge 15lb wga until I can get my car properly tuned and dialed in since I am not experienced with tuning the Grimmspeed.

Only problem is, even with the Forge 15lb wga, the boost is still spikes excessively at any type of WOT. I figure i might need to adjust the preload on the WGA but if the symptoms are exactly the way it was when I put the 25lb wga on. Am I missing something here?

Btw, the preload on the 15lb appears to be similar visually as when I first had it on originally so I can't see how it is that much different in the way the boost is now.

 

If you didn't change the length of the arm on your old actuator it shouldn't have changed anything. Is the weather different than before?

Why did you want to go with a tighter actuator if you already had boost creep? I would have thought that would make the problem worse. I'm running an 18 psi actuator on my Black because I was worried about creep with the 25 psi one.

 

Well, the length of the arm is at or close to where it was when I put it back on and saw the boost shoot for the moon. I then tried adjust it twice and same results. Check vacuum lines and still the same problems.

Btw I had 2 people recommend going 25lb because we were trying to figure out if the 15lb wasn't up to the task of running 26+ lbs of boost.

Frustrating....yes. Any help is appreciated. Still trying to figure this out.

 

The only thing I can think of is that you have the vacuum lines incorrectly routed to the 3-port or one of them is leaking badly. Try hooking the wastegate actuator directly to a boost source and see if it runs at wastegate pressure without any crazy spikes. If that's okay, then you know that the problem isn't the actuator.

 

make sure the boost controller hoses are not kinked you could also get the 3 port adjusted so that it doesn't spike too much.

 

I would hook the actuator to an air compressor regulated down to 30psi and check that its working properly and the diaphragm is not blown.

I find it interesting how 10 years ago internal gates and actuators were the poor mans way for boost control on hybrid turbos. I remember talking to FP when the original FP30s were due for release and they told me internal gates were junk and there was no way to consistently hold high boost pressures for solid HP figures without a quality external gate. Now with their incarnation of "colored" EVO turbos, internal gates are now satisfactory for a 600whp combo.

 

set the preload according to fp's instructions on their website and then test it while its on the turbo with an air compressor.But if you had a boost creep issue with the 15lb i dont see how the 25lb will help unless the 15lb had a leaking diaphragm. As said above i would be looking at the vacuum lines and boost controller for issues.