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What springs are in the gates, and what is the actual boost being seen? Also, which boost controller, and where is the boost reference for the wastegates (bottom) and boost controller pressure reference plumbed to? If the tuner "fixed it" and it worked for a day, it sounds like a boost controller issue. Actual boost creep due to poor exhaust/kit design would occur when you are trying to run low power/boost, not with higher boost. This is because at low power/boost, more exhaust gas needs to go through the wastegates, to bypass the turbine, and keep the boost low. |
I just started reading another thread and it seems that I'm not using the correct spring. I have the recommended yellow spring. Here's the link.
As for what I'm seeing. I'm tuned for 9psi and I see up to 10.3 psi on that map. Second map I'm tuned for 10psi and I have seen up to 13psi. It's not a surge or spike because it happens after running closer to redline. Map 3 Is tuned for 12psi. I haven't been able to run this map because I've seen as high as 15psi. I'm tuned with ecutek. Boost through the ECU. My tuner said the SCG1 BC I had installed wasnt working properly so we switched over to boost through the ECU. It's still plumbed in and I use it as my boost/AFR gauge. As for where its plumbed into. I'm not entirely sure. I tapped the manifold for boost pressure. http://www.the370z.com/forced-induct...lumbing-2.html |
So people are not using the yellow spring? What spring are they using??
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You use whatever spring combo that nets your desired wastegate pressure. I use my Greddy Profec in the same manner since I also have boost by ECU. Seeing as the solenoid is opened by a signal from a map sensor its reading manifold pressure which is also where your boost reference for the controller is tapped up front. That reference for me is also split with a 5psi hobbs switch and the fuel pressure regulator.
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Yes, you can use any spring you want, as long as the car is tuned for it.
As for "boost creep", I am not sure that it is understood. Boost creep is an uncontrolled increase in boost as the RPM's go up. So if you are starting at say 8psi at 4k RPM, and hitting 12psi by 7k RPM, then it is considered boost creep. I have not had any customer experience boost creep, this includes the local guys, where I installed the same kit you guys are running. |
That is exactly what I'm getting ^. Especially in 3rd and 4th gear between 5k and 7k RPMs
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Its actually a innovate SCG-1. I'm not 100% what solenoid it is but it is still on the car. After reading more threads and remembering my EBC didnt work properly. I'm beginning to think that this is a plumbing issue. I plumbed in the vacuum lines per sashas instruction manual. I had a shop do the boost controller plumbing after. I'm wondering now if the reason my tuner could never get it to function properly was because it was plumbed incorrectly. Still somewhat abnormal considering the car ran great for a while after it was tuned. If the WG springs and 02 sensor doesnt cure my boost creep problem I might just have the boost controller solenoid removed and the plumbing completely redone.
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My setup with boost by ECU has only one vacuum line teed going to the lower wastegates from the solenoid. Previously on the EBC it was this. ( very easy for you to verify on your own.)
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How does Ecutek control the solenoid? Do you have to wire it into the ECU? My EBC is plumbed (not sure if my ports are the same on the solenoid) the same way as yours but obviously my solenoid runs to my controller. |
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I always wondered how that worked. That’s pretty simple and wouldn’t require me ordering anything else assuming you can use any solenoid. I assume the solenoid is just a milliamp signal that translates into percentage open. |
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