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Thread: The basics of boost control, wastegates and how to turn up the boost.

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Posts: 31-40 of 53
2012-06-23 09:47:07
#31
thanks for the prompt answers.

Originally Posted by BenFenner
The old Porsche setup is not electronic at all, so there is no wiring involved. It is a completely mechanical system.

I mean electronic boost control systems tend to use the same topology (using electronic valve instead of mechanical regulator), e.g:
http://www.gizzmoelectronics.com/pdf/IBC%20Instruction.pdf
I do not really understand why they do this and not use the bleeding method just as they do with internal wastegates.

Furthermore with my clarification you should notice that the typical EBC setup does apply pressure to both the top and the bottom of the diaphragm.

I really hope the diagrams and a little bit of re-wording I've done will help you see the pros and cons of each system. If you still have any questions, let me know.


I still cannot see any of the pictures in that post. Maybe I am experiencing some browser issues? I can see the picture in the first post of the thread btw.

Viktor
2012-06-23 23:53:10
#32
You don't see these three pictures in post #6?

http://www.sr20-forum.com/members/benfenner-albums-benfenner+misc-picture182-ebc-method-01.png
http://www.sr20-forum.com/members/benfenner-albums-benfenner+misc-picture183-ebc-method-02.png
http://www.sr20-forum.com/members/benfenner-albums-benfenner+misc-picture184-ebc-method-03.png
2012-06-24 00:44:47
#33
Do you plan on going into why newer cars like to use an EBC thats tapped to a vac source to control boost?

Also... if you are using a ext WG and it has two ports... (if you wanted lower boost) you could trap a slight vacuum into the top port of the wg instead of leaving it open to the atmosphere.
2012-06-24 03:02:59
#34
I'm not familiar with vacuum-based boost control, so I won't be getting into that any time soon.

Keep in mind, there are internal wastegate actuators with dual ports.
2012-06-24 03:15:07
#35
Originally Posted by BenFenner
I'm not familiar with vacuum-based boost control, so I won't be getting into that any time soon.

Keep in mind, there are internal wastegate actuators with dual ports.


Go check out an EvoX , threw me for a loop when i first saw it.
2012-07-03 12:45:47
#36
Has anyone had luck with the homemade mbc?
Last edited by SERpriz on 2012-07-03 at 12-46-10.
2012-07-03 12:48:44
#37
I have. Worked perfectly. No spikes.
This is on a RWD SR20 and a couple RWD BMWs.
Last edited by BenFenner on 2012-07-03 at 12-48-55.
2012-07-03 12:55:37
#38
K jw, need to make one up for the time being. You have any tips, or just follow the steps. Thanks for the fast response.
2012-07-03 13:00:52
#39
I like to build them exactly like the ones sold here: http://www.sr20-forum.com/turbo/35182-come-get-your-mbcs.html

That varies a little bit from most directions because it eliminates a piece, and removes the tapping requirement.
It can be a bit tricky to find the right ball and spring. You may have to get creative.
Do not forget to drill the tiny bleed hole in the main housing. That is important, and make sure you do it in the right spot so you don't have a constant tiny vacuum/boost leak.
2012-07-03 13:03:32
#40
Exactly my next question, do you remember what spring you used and how much boost you were at?
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