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View Full Version : Manual Boost contollers....



JUDGENINJA
Wednesday 2nd March 2005, 04:26
Well peeps I haven't raised enough cash to get the RICA unit I'm desperate to own so I'm going to opt for a MBC for the time being.....

I'm trying to get info on how they work....

Does the tuning dial screw in to close the valve or hold it open..?
Does the valve work on pressure or vacuum..?

Have people seen the brass one on Eaby for 22.99?
Is it true that the brass one will be more reliable than the steel one?
Is the price a good price?

I did have a thought could I get one from a hydralic suppliers etc..and would it be cheaper?

anyway any info would be good...?

Bracer
Wednesday 2nd March 2005, 09:14
Boost controllers serve two functions; increase boost levels beyond the set wastegate spring pressure and reduce the "pre-opening" of the wastegate-controlled boost pressure.

A manual boost controller will allow you to increase boost levels beyond what the wastegate spring is set. How does it work? Below is a diagram of a manual wastegate.

http://www.turbosaturns.net/images/manual%20boost%20controller.gif

In order to run a manual boost controller we need to tee off of the vacuum line which runs from the turbo compressor housing to the compressor reference port. The manual boost controller works using a spring and check ball, by screwing the adjusting screw into the boost controller you put more pressure on the spring which reduces the amount of airflow through the boost controller and into the boost controller port. Less airflow means less pressure will be assisting the spring to keep the wastegate plunger shut. The pressure in the vacuum line going to the compressor reference port will equal the pressure the turbo is producing. A boost controller will allow you to direct some of that pressure to the top of the wastegate diaphragm creating two opposable forces. By adjusting the spring pressure of the boost controller you can vary the amount of boost that the turbo will make before opening the wastegate's plunger. If you want to run a higher boost level than the wastegate spring allows you will need a boost controller.


The manual boost controller is a very simple device that can help you make more power from your turbo setup. Here are three additional things to keep in mind about wastegates:

Without a line running from the compressor housing to the wastegate's compressor reference port boost pressures will keep increasing forever. This will quickly destroy your engine!

Run a wastegate as close to the desired boost pressure as possible this will help the boost controller handle the pressure better.

You can't reduce your desired boost pressure lower than the spring rate.



Brass ones are more common but this is due to it being a easier material to work with.

The straight or "Inline" style MBC's are supposed to be better than the ones that "Right Angled", giving quicker responce and less spikes.

Hope this helps :wink:

JUDGENINJA
Wednesday 2nd March 2005, 09:21
Your a fountain of knowledge as always....!!!!!

An inline one it is then...
Thanks

JUDGE

Bracer
Wednesday 2nd March 2005, 09:43
Your a fountain of knowledge as always....!!!!!

An inline one it is then...
Thanks

JUDGE

Just glad to be of service mate :wink:

lance
Wednesday 2nd March 2005, 10:50
Judge
I have a mbc sat in my car unconected that you can have for 10+ postage, if you are intrested, or I can bring it to Avon Park!

JUDGENINJA
Thursday 3rd March 2005, 02:23
Yes Please....PM sent...

Wobbly Dave
Thursday 3rd March 2005, 02:24
I am feeling the love! :lovestory

JUDGENINJA
Thursday 3rd March 2005, 03:38
I do start worry when you start to feel the love.... :shifty: have you been playing that spank the monkey game ??????.........lol

Wobbly Dave
Thursday 3rd March 2005, 04:37
I was speaking more of the ovlov! Namely the spirit of mutual appreciation and co-operation, in respect of a Swedish car marque.

Bracer
Thursday 3rd March 2005, 09:40
I was speaking more of the ovlov! Namely the spirit of mutual appreciation and co-operation, in respect of a Swedish car marque.

We love feeling the love, dont we Dave :wink:

Justin
Thursday 3rd March 2005, 09:55
Im right there with ya, Dave and Bracer, the force is strong in you 2 ;)

Wobbly Dave
Thursday 3rd March 2005, 11:06
I came short of using "group hug". What with Lance giving the MBC away practically and Steve to tell how to set it up ... I tell ya - I'm welling up :beer:

JUDGENINJA
Monday 16th July 2012, 02:46
Thread resurection - not for any other reason than to follow up on Stibo's declaration to VPC love...this was my first ever thread in 2005, as you can see VPC love was strong back there too... A group of normal(ish) people willing to help me out..... The people may have changed, but the sentiment in the site is alive and well....

lance
Monday 16th July 2012, 08:06
I'm still here, forgot I had an Mbc but remember judges 850 and good old days at the pod and avon