BP turbo build/advice

Hotrodz

Oh and as mentioned a vented hood is a good thing. I also will open my hood when I get home just to let the vehicle cool more efficient on hot days.

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PongSanity

For the boosted guys... What are your intake temps? With the stillen cai (yes I'm still NA. It sucks) I'm 10° over ambient temperature.


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instroke

I hope I can explain this clearly - if you can see in the Diagram from the Turbo to the Boost selenoid - you have a T - the bottom of that T it takes you to both wastegates.

If you change where the Turbo is and where the wastegates are - so the bottom of the T would have the presure source (turbo) and the other vacuum lines the same for the Wastegates - would this have any effect on the proper operation of the boost controller?

So all you are doing is changing the direction of the T...


[IMG][/IMG]

jwick

Picture doesn't show o up on my phone.

For a good example, here's how my vacuum/pressure lines are routed.

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'10 G37T 6MT Graphite/Graphite - BP - G37T Build

jwick

Now that I can see the picture on my PC changing the direction of that Tee has no impact, infact I would run it like you described and not in the picture. I routed all mine where the pressure source hit the Tee and has to divide in half to the downstream users but it shouldn't matter for the volume of tubing compared to PSI, it'll all equalize in the line basically instantly.

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Boosted Performance

With this configuration, you will see less than spring pressure at the manifold. If you run it like this, you are taking your pressure source at the compressor, where the boost will always be highest, as this does not take in to account the pressure drop across the piping and intercooler. So if you put an 8psi spring in the gates, you may see 7psi at the manifold due to the 1psi drop across the system.

So, what you can do is run the boost source to the lower ports of the wastegates from the nipple on the driver side charge pipe (this is the port available in the kit). Then, instead of plugging the port on the compressor, you can run it to Port #1 of your solenoid, and then from Port #2 to the top half of the wastegates.

This configuration would work perfectly fine.

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TcRocket

Well said Sasha exactly how I'm running my vacuum lines

instroke

My Innovate Scg-1 is set at the lowest duty cycle - but it's overboosting over 10 - 12 psi. Gain is set low.

I am thinking the solenoid is not working correctly - so I bought a Turbosmart manual boost controller.

Sasha or Jwick - I unhooked the line going to the top of the wastegates. Is it ok to run like this? for testing purposes...

So the Turbosmart manual has line from boost source underneath driver's intake - and into controller then out of controller to T'd side of both wastegates.

crossing my fingers...

jwick

Clarification - the manual boost controller is plumbed into the top port of the WG?

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instroke

no it's the the side's of each wastegate - but I just got back, short little cruise - still boosting 10 psi. Kept it below 5 k...

I re-hooked the SCG1 back up... this is weird.

jwick

That's because you have the manual boost controller plumbed incorrectly. You need to take the source from the driver intake and tee it to both lower ports on the WG. Then either take a second pressure source to the boost controller and then Tee it to the top ports on the WGs.

Either that or you could Tee of the intake tap, run one side to another tee and to each of the lower ports of the WGs, then the other side of the original Tee will go to the manual boost controller and then get teed again and run those to the upper ports.

Easiest way to check if everything is correct now is to simply remove the boost controller and run straight to the WGs. Leave the upper ports open to atmosphere. This should be WG spring pressure. If you used the yellow spring you should be around 7-8lbs.

Edit - if you take a look at my diagram a few posts up you'll see how I plumbed mine.

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instroke

Jwick thxs - I do have it hooked up - just like in your second Paragraph or picture. And still got me to 11.5 pds tonight.

At the beginning of all this - I changed a Vacuum line from Driver's intake T to Bottom wastegate T's. I changed it as it was really close the the engine, and I thought it might have been leaking. I used a Turbosmart 1/4" but I think Sasha uses 6mm. This is a small difference but could this be the cause?

But tomorrow night I will remove the left vacuum line from the Selenoid - that runs to the T'd upper WG's. And then remove the right side Selenoid hose and plug it and wire tie just in case. So essentially the right side intake tube will be running to WG's bottom ports. If I get boost about 8 psi ---- this would be a WG problems then right? I am on 7 psi springs... thxs again for the help...

Boosted Performance

There has to be an issue with the plumbing somewhere. Just double check the lower port side of things, and make sure there are no leaks/kinks. That is about the only way you will overboost.

What colour springs did you put in the gates?

The best way to test it all, is to disconnect the lines on the top half of the gates, and leave them open to atmosphere. With this, you should see close to spring pressure boost levels.

If you are seeing anything higher, this is the area you need to focus on.

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instroke

So I found the issues with my boost spiking so high - I had 4 missing wastegate plugs. Two from one side lower ports and a plug from each of the top ports of each wastegate, 4 in total.

So Sasha supplied me with 4 more - and they are all back in. I added some high temp thread sealant and I have control of my boost again.

I think what happened last year, just before storage, I took my Z to my favorite oil change place and they had a line up, being impatient, I drove elsewhere, and the guy working on my car has an extra set of wastegate plugs. It kinda makes sense cause my boost was acting up at the end of last year. I will never let a stranger work on my Z again.

Car feels great at only 8.5 psi - the turbo spooling thru shifts is sooo enticing! Great kit! thxs again Sasha!

1cleanZ

glad to hear you figured it out!

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