BP turbo build/advice

Boosted Performance · 01-22-2019, 10:46 PM

Quote:

Originally Posted by James10694

Now that were on the topic of wastegates.. I'm still having overboosting/boost creep issues. I spoke with my tuner and he sent me an updated map. Fixed the problem for a day and then started overboosting the next. I know it's not a cold weather issue because its been happening all year.

I've seen alot of other platforms having boost creep issues with the external tial wastegates. I could be going down the wrong path here but has anyone swapped to a different wastegate completely and has anyone else had this issue? I spoke to solidus about this and he said his wastegate spring pressure was not rated for what tial claimed when tested. Even if that's the case. Shouldn't the tuning keep the boost pressure from going over? I'm not the most knowledgeable when it comes to turbochargers so I'd appreciate any help or advice

I'm having a vacuum pressure test done just to rule out any type of vacuum leak.

I have not heard of any customers having issues with any boost creep.

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.

James10694 · 01-23-2019, 12:50 PM

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.

BP kit folks. Question on wastegate plumbing.

NeverBoneStck · 01-23-2019, 02:33 PM

So people are not using the yellow spring? What spring are they using??

solidus · 01-23-2019, 05:05 PM

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.

James10694 · 01-23-2019, 08:46 PM

Quote:

Originally Posted by NeverBoneStck

So people are not using the yellow spring? What spring are they using??

This is what I need to know as well. My tuner recommend the red spring

Boosted Performance · 01-24-2019, 12:59 AM

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.

James10694 · 01-24-2019, 01:01 PM

That is exactly what I'm getting ^. Especially in 3rd and 4th gear between 5k and 7k RPMs

Boosted Performance · 01-24-2019, 01:27 PM

Quote:

Originally Posted by James10694

That is exactly what I'm getting ^. Especially in 3rd and 4th gear between 5k and 7k RPMs

There has to be an issue somewhere in the plumbing. I see the power output in your signature, is that where the issues is, or is it when you are just on spring pressure, with the EBP installed, but bypassed when only on spring?

James10694 · 01-24-2019, 03:31 PM

Quote:

Originally Posted by Boosted Performance

There has to be an issue somewhere in the plumbing. I see the power output in your signature, is that where the issues is, or is it when you are just on spring pressure, with the EBP installed, but bypassed when only on spring?

I had my shop do a vacuum leak test today and he found no leaks.Right now the EBC is plumbed in but not being utilized. It's running on spring pressure and I believe completely bypasses the EBC. I'm installing the red wastegate springs today and replacing a faulty O2 sensor. I'll be getting an updated tune as well. Hopefully that fixes my issue. I'll keep everyone posted.

solidus · 01-24-2019, 04:04 PM

Quote:

Originally Posted by James10694

I had my shop do a vacuum leak test today and he found no leaks.Right now the EBC is plumbed in but not being utilized. It's running on spring pressure and I believe completely bypasses the EBC. I'm installing the red wastegate springs today and replacing a faulty O2 sensor. I'll be getting an updated tune as well. Hopefully that fixes my issue. I'll keep everyone posted.

Just because , did you keep the Greddy solenoid? I replaced mine with an aftermarket just in case. Wanted to start out fresh. Can't be wiring because the polarity doesn't matter when splicing to the evap.

James10694 · 01-24-2019, 04:29 PM

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.

solidus · 01-24-2019, 04:41 PM

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.)

jwick · 01-24-2019, 06:39 PM

Quote:

Originally Posted by solidus

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.)

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.

solidus · 01-24-2019, 06:55 PM

Quote:

Originally Posted by jwick

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.

The signal to the Evap control solenoid is hijacked and the signal sent to the boost control solenoid. Simple splice of the two evap solenoid wires redirected to the boost solenoid.

jwick · 01-24-2019, 06:58 PM

Quote:

Originally Posted by solidus

The signal to the Evap control solenoid is hijacked and the signal sent to the boost control solenoid. Simple splice of the two evap solenoid wires redirected to the boost solenoid.

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.

01-23-2019, 12:50 PM	#497 (permalink)
James10694 Track Member Join Date: Oct 2013 Location: Las Vegas NV Posts: 916 Drives: 2010 370z Nismo Rep Power: 13	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. BP kit folks. Question on wastegate plumbing. __________________ Boosted Performance Single Turbo 618whp/489 tq

01-23-2019, 02:33 PM	#498 (permalink)
NeverBoneStck A True Z Fanatic Join Date: Oct 2009 Location: Beaverton, Or Posts: 1,110 Drives: 2008 G37 S Rep Power: 18	So people are not using the yellow spring? What spring are they using?? __________________ Juiced! That is all you need to know !!

01-23-2019, 05:05 PM	#499 (permalink)
solidus Track Member Join Date: Oct 2014 Location: Orlando, Florida Posts: 694 Drives: 15' Nismo Black 6MT Rep Power: 10081	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. James10694 likes this.

01-24-2019, 12:59 AM	#501 (permalink)
Boosted Performance The370Z.com Sponsor Join Date: Feb 2010 Location: Edmonton, AB Posts: 1,629 Drives: Z's Rep Power: 3382	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. __________________ 750WHP starting @ $7,500 to the door FOR DETAILS VISIT: http://www.the370z.com/members/boosted-performance.html FB: https://www.facebook.com/Boosted-Per...6303179791462/ IG @boostedperformanceyeg

01-24-2019, 01:01 PM	#502 (permalink)
James10694 Track Member Join Date: Oct 2013 Location: Las Vegas NV Posts: 916 Drives: 2010 370z Nismo Rep Power: 13	That is exactly what I'm getting ^. Especially in 3rd and 4th gear between 5k and 7k RPMs __________________ Boosted Performance Single Turbo 618whp/489 tq

01-24-2019, 04:29 PM	#506 (permalink)
James10694 Track Member Join Date: Oct 2013 Location: Las Vegas NV Posts: 916 Drives: 2010 370z Nismo Rep Power: 13	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. __________________ Boosted Performance Single Turbo 618whp/489 tq

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