Jump to content
The mkiv Supra Owners Club

Fitting manual boost controller


black_widow87
 Share

Recommended Posts

Hi guys, took my car to a local garage to get my manual boost controller fitted. When i got the car back it would not boost over 0.2bar and whichever way i twist the knob it would not change boost :( They obviously didnt fit it correctly!!!

If anyone can recommend somewhere in the midlands area who knows how to fit these kinda things PROPERLY i very much appreciate it :D

 

CHEERS

jake

Link to comment
Share on other sites

Something sounds very wrong there bud. Only a boost leak or a fooked turbo would cause THAT low boost. Do you only get 0.2 all the way through the rev range or does the 2nd tubby come in with a bang after 4krpm?

 

It is such a simple job to do I just can't believe they managed to get it so wrong, I certainly wouldn't recommend going back there for anything.

 

In the mean time I would get it removed ASAP to make sure they haven't fooked your turbo by having it set too high. As long as when you remove it and get it back to stock it boosts you are safe. I can't see what would be causing this though.

Link to comment
Share on other sites

sounds like they have done something which is not too good

 

Got any pics of where they have fitted it?

 

A manual boost controler just vents some of the pressurised air to atmosphere instesd of allowing it to open the wastegate so in theory when fully shut you should have stock boost or what ever the RR is set at and fully open would be bad. it sounds like they might have pulled a hose off somewhere by mistake/didnt relise and you simply have a boost leak. other than that your tubbies have bit the dust

Link to comment
Share on other sites

sounds like they have done something which is not too good

 

Got any pics of where they have fitted it?

 

A manual boost controler just vents some of the pressurised air to atmosphere instesd of allowing it to open the wastegate so in theory when fully shut you should have stock boost or what ever the RR is set at and fully open would be bad. it sounds like they might have pulled a hose off somewhere by mistake/didnt relise and you simply have a boost leak. other than that your tubbies have bit the dust

 

No, a manual boost controller restricts the pressure from the manifold to the actuator. It doesn't vent anything, it just restricts the flow via a ball and spring (if you get a half decent one, there are other methods).

 

When it is fully shut the restriction is at its maximum and the car will overboost by quite a bit. When it is fully open the car will operate as normal.

Link to comment
Share on other sites

Something sounds very wrong there bud. Only a boost leak or a fooked turbo would cause THAT low boost. Do you only get 0.2 all the way through the rev range or does the 2nd tubby come in with a bang after 4krpm?

 

It is such a simple job to do I just can't believe they managed to get it so wrong, I certainly wouldn't recommend going back there for anything.

 

In the mean time I would get it removed ASAP to make sure they haven't fooked your turbo by having it set too high. As long as when you remove it and get it back to stock it boosts you are safe. I can't see what would be causing this though.

 

Yes iv had it removed straight away and now the boost is back to normal at 1bar. When it was fitted the first turbo fuctioned as normal boostin to roughly 0.7bar, but as soon as the second tubby came online it would not go above 0.2bar :(

Do you think it may be a dodgy controller as both turbos still now function properly???

Link to comment
Share on other sites

Yes iv had it removed straight away and now the boost is back to normal at 1bar. When it was fitted the first turbo fuctioned as normal boostin to roughly 0.7bar, but as soon as the second tubby came online it would not go above 0.2bar :(

Do you think it may be a dodgy controller as both turbos still now function properly???

 

 

Ahh that's different, sounds like everything is OK.

 

Nothing to do with the controller, the controller has no way of lowering the boost. It is all to do with the installation. Do you not fancy doing it yourself? It is really straight forward, you only need to intercept 1 hose and the job is done :)

Link to comment
Share on other sites

after a quick search there seems to be 3 types of manual boost controller

 

Bleed valve - works as I said

Ball and spring - works as scott M said

Diaphragm type - found little info so far

 

just some info on what they do

 

http://en.wikipedia.org/wiki/Boost_controller

 

Anyone using a bleed valve is mad. It is basically a deliberate boost leak. Granted it is only a small one but it is a leak none the less. The pressure in the intake manifold is generated by the turbos (obviously), a pipe basically comes from there to the actuator, when it hits a certain boost pressure the actuator opens. If you install a bleed valve between the manifold and the actuator some of the air is bled via the valve. This means that the pressure in the manifold will drop ever so slightly. As you are setting the boost controller at a particular setting (1.2bar) some of the pressure is being lost via the leak. This means that the turbos have to work of the equivilant of 1.3bar (a guess), 1.2bar for the pressure wanted and 0.1bar for the pressure lost via the leak.

 

Not good :)

Link to comment
Share on other sites

Join the conversation

You can post now and register later. If you have an account, sign in now to post with your account.
Note: Your post will require moderator approval before it will be visible.

Guest
Reply to this topic...

×   Pasted as rich text.   Restore formatting

  Only 75 emoji are allowed.

×   Your link has been automatically embedded.   Display as a link instead

×   Your previous content has been restored.   Clear editor

×   You cannot paste images directly. Upload or insert images from URL.

 Share

×
×
  • Create New...

Important Information

We have placed cookies on your device to help make this website better. You can adjust your cookie settings, otherwise we'll assume you're okay to continue. You might also be interested in our Guidelines, Privacy Policy and Terms of Use.