Boost falling off - Zilvia.net Forums | Nissan 240SX (Silvia) and Z (Fairlady) Car Forum

Silvia_Drift · 06-17-2010, 07:18 PM

Hey guys. I'm having trouble with setting my boost. I want to set it for 19 psi but the boost is always falling off at high rpms. It usually falls off around 6600rpm and higher.

I have a HKS adjustable wastegate actuator so I tried bypassing the boost controller and adjusting it through the wastegate and the boost drop off was even worse.

I also tried playing with the gain and set gain values (Greddy Profec Spec 2) but that didn't do much.

I also fixed all of the boost leaks and while this improved response, the boost still falls off.

Could this be that the actuator is not good enough for the higher boost setting?

My setup:

Redtop SR
GT2871R .64
BC Step 3 cams
Greddy Profec Spec 2

06-17-2010, 07:18 PM	#1
Silvia_Drift Zilvia Member Join Date: Dec 2004 Location: Canada Posts: 159 Trader Rating: (1) Feedback Score: 1 reviews	Boost falling off Hey guys. I'm having trouble with setting my boost. I want to set it for 19 psi but the boost is always falling off at high rpms. It usually falls off around 6600rpm and higher. I have a HKS adjustable wastegate actuator so I tried bypassing the boost controller and adjusting it through the wastegate and the boost drop off was even worse. I also tried playing with the gain and set gain values (Greddy Profec Spec 2) but that didn't do much. I also fixed all of the boost leaks and while this improved response, the boost still falls off. Could this be that the actuator is not good enough for the higher boost setting? My setup: Redtop SR GT2871R .64 BC Step 3 cams Greddy Profec Spec 2