Subject	Your adjustment is creating the issues.....
Posted by	Greg D. (Specialty-Z) on October 21, 2015 at 2:36 PM
	This message has been viewed 928 times.
In Reply To	My max boost is 15 psi...or not? posted by evan_aggie on October 21, 2015 at 10:20 AM
Message	Based on your details I would say your true cracking pressure is only 7 PSI. The JWT 530 comes with a 12 PSI actuator spring, if you adjust your preload cracking pressure at 9 PSI, your not installing any preload, you have not even reached the spring pressure. If you do not preload to at least spring pressure, the exhaust back-pressure will simply blow the wastegate door open. What is happening is the backpressure of the exhaust is opening the wastegate very early and adding lag due to less exhaust driving the turbine wheel. In order to get 15 PSI boost with lower preload than the exhaust back pressure and wastgate spring, your running your duty cycle on the boost controller way too high. Because of the mess your making due to the wrong adjustments, your loosing control at higher loads when the turbo has the ability to make more boost. The more engine load you have, the more exhaust energy you have to drive the turbine. Boost controllers are designed to increase boost by delaying the signal to the wastegate actuator, but they can not work properly if the preload of the actuator is set lower than the actuator spring, especially when preload is set lower than the exhaust backpressure between the exhaust valves and the turbine wheel.
Follow Ups	My max boost is 15 psi...or not? - evan_aggie 10:20:19 10/21/15 That may be boost creep - BlackholeZ 11:28:38 10/21/15 My boost controller seems spot on and works well...below 15. (n/m) - evan_aggie 11:48:30 10/21/15 Your waste gates should be set at the lowest desired psi. - bartz32tt 14:02:38 10/21/15 Your adjustment is creating the issues..... - Greg D. (Specialty-Z) 14:36:19 10/21/15 Greg, you programmed my Greddy unit. - evan_aggie 15:33:00 10/21/15 To be clear - I'm actually quite happy with how the - evan_aggie 15:36:44 10/21/15 20 psi spikes on pump gas seems like a problem.. (n/m) - Boosted1 19:35:52 10/21/15 Again, your set up is in-correct.... - Greg D. (Specialty-Z) 19:49:12 10/21/15 How do you get to the PS WG? - evan_aggie 22:12:22 10/21/15 Evan, email or call Dane he might be able to give you some - Krazyd27(Houston) 11:17:59 10/22/15
Post a Followup	You cannot reply to this message because you are not logged in.