How to install a manual boost control? - Nissan Forum
Z31 300ZX(T) 1984-1989 Zs - Engine and Chassis Discussion

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post #1 of 20 Old Aug 18th, 2008, 01:40 PM Thread Starter
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How to install a manual boost control?

Ok so I got a manual boost control for my 84 300zx turbo and i want to make sure im going to put it on right. I was told that you install it to the J looking hose that connects from the turbo to the wastegate. I just thought that there might be more to it then that. thanks for the help.
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post #2 of 20 Old Aug 21st, 2008, 12:02 PM
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It goes between the source hose and the hose that connects to the wastegate. Yes. It really is that simple.

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post #3 of 20 Old Aug 21st, 2008, 02:05 PM
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just make sure you have it turned all the way down before the test drive and keep an eye on the boost gauge you should have installed...
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post #4 of 20 Old Aug 21st, 2008, 03:04 PM Thread Starter
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Thanks for the help but i dont understand what you mean by the source hose. I know the hose between the wastegate and the turbo but i dont know what you mean by the source hose. thanks for the help
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post #5 of 20 Old Aug 21st, 2008, 06:33 PM
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Well... A hose has a source. The source in this case is the point (or points) it comes off the turbo.

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post #6 of 20 Old Aug 21st, 2008, 08:16 PM
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the source hose is the one supplying the boost.
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post #7 of 20 Old Aug 21st, 2008, 11:19 PM Thread Starter
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thanks for the help but i have one more question. the manual boost control has a little adapter piece that has an arrow on it that says to wastegate. I am not sure how to hook the adapter up with the boost piece. Here is a picture of what i have (the adapter is on the right) thank you guys again.

http://www.made-in-china.com/image/2...roller-003.jpg
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post #8 of 20 Old Aug 22nd, 2008, 12:19 AM
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i know which one you have and you need these instructions. im borrowing these from another website.





The "T" piece gets spliced in, arrow towards waste-gate, between vacuum source and waste-gate, the "Controller" comes from the Black-Port on the Top of the "T" to the Top-Port (Adjuster end) of "Controller", and just vents to Atmosphere out the Bottom-Port.

The arrows on the thing are completely wrong. After doing some research on how wastegates work and how the check valve is setup (the "T" part). I believe the knock-off company did not actually do the research when they made the stickers. The knock-off "T" has the spring and ball set up a different way then the "TurboSmart" one. In the "TurboSmart" setup the ball is against the inlet side, the knock-off is on the wastegate side. They both function the same, but use different techniques. You can check by blowing through the "T" fitting on the top and seeing where the air comes out... the free flowing side is the wastegate side. Because it does not matter if there is a vacuum leak on the wastegate side as is does not use vacuum pressure.



The idea is under vacuum the ball is pressed against the opening by the spring stopping any air from going to the wastegate or the venting boost controller. And when you have boost, the ball pushes against the spring and moves the ball out of the way allowing the airflow through to the wastgate and boost controller. "TurboXS" used to do this with little rubber gaskets, that when under vacuum seated and sealed and under boost pushed out of the way venting boost pressure. The check valve design also makes it so depending on spring tension (like a BOV or Wastegate spring) it requires a certain amount of boost (pressure against the ball) in order to even let the boost pressure pass by to the wastgate actuator. Making it so the actuator does not creep open before your peak boost.

The entire point of the check valve is to stop you from having a constant vacuum leak to atmosphere when using the Manual Boost Controller.

Hooked up this way the kit works perfectly.

---NOTE---
Wastegates work exactly opposite a BOV... but do the same thing.

Wastgates use boost pressure to compress a diaphragm spring rated to compress under a certain amount of load to actuate a valve.
IE: When you have positive/boost pressure of 7psi-ish on your vacuum line, a 7psi rated Wastegate actuates and opens the "Wastegate-valve" allowing exhaust gases to bypass the turbo thus creating less boost.

Blow Off Valves use vacuum pressure to suction a diaphragm with a spring rated to compress under a certain amount of load to actuate a valve.
IE: When you have negative/vacuum pressure of 7psi-ish on your vacuum line, a 7psi rated BOV (most are more like 17psi rated springs hence the adjuster screw) actuates and opens allowing the excess boost in front of the closed throttle body to be vented without back-flowing into the turbo.

Last edited by Asleep; Aug 22nd, 2008 at 12:21 AM.
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post #9 of 20 Old Aug 22nd, 2008, 01:43 AM Thread Starter
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thank you so much this helps a ton. i was just so confused on how that thing worked but you helped me a lot. thank you
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post #10 of 20 Old Aug 23rd, 2008, 10:35 PM
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did you get it to work using these instructions?
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post #11 of 20 Old Aug 23rd, 2008, 11:33 PM Thread Starter
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i havent put it on yet because i cant really reach the tube from under the car, i will most likely lift my car up. The stuff you posted help me and i now know what to do. thanks a lot for the help.
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post #12 of 20 Old Sep 15th, 2008, 05:49 PM
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Careful to watch for boost spikes, you can blow up your engine quick.

Stop Snitching.

Yes... little girls do it.
Yes... insecure grown men do it.
Yes... it should be stopped.
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post #13 of 20 Old Nov 28th, 2008, 01:07 PM
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okayi followed asleeps instructions on the knock-off boost controller and so far i have put the t-peice in and connected the hose up to the boost controller but what does the other barb on the boost conntroller do?? it says it just vents into bay????
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post #14 of 20 Old Nov 28th, 2008, 02:28 PM Thread Starter
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yeah the other barb will just vent into the engine bay. its crazy how much faster the car is with the manual boost control.
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post #15 of 20 Old Nov 28th, 2008, 03:40 PM
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Quote:
Originally Posted by 50thZ View Post
yeah the other barb will just vent into the engine bay. its crazy how much faster the car is with the manual boost control.
So it just hangs somewhere and does nothing lol?

and is the knock-off boost controller anygood?
Does it spike lots?
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