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simple Boost question

Old 02-06-2012, 08:52 PM
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Default simple Boost question

Im turboing a 250cc kawi, but thats not important.

I would like to run 4psi for cassual ridding and 8-14psi when I want to ride hard.
For this I will get the TURBOSMART Dual Stage MBC........BUT........

The wastegate spring is default @ 7psi, does this mean I would never be below 7psi?

I'm having a head-scratcher thinking about controlling the boost in that^ way if the wastegate will not release under 7psi.


Would the setup likely only come out to around 4psi anyway due to plumbing and the intake plenum tank?

Are there any boost controllers for the COLD(intake) side that would allow me to do this? Like a controlable BOV?

Im sure I will have more questions, but this one has me stumpped
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Old 02-07-2012, 09:23 AM
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It won't start opening until about 7. I have a 9psi spring and i get as high as 10.2 psi boost sometimes. If your set up is right you will get 7psi or higher.
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Old 02-07-2012, 05:22 PM
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So I understand that the TURBOSMART Dual Stage MBC can allow it to remain shut. But I wish it could also open it sooner, stupid spring.(I understand why it can't)

So let me throw this out there, maybe I shouldnt.
Could I run a second, smaller wastegate, someplace on the intake side? Maybe next to the BOV and put a 4psi spring in it? I say to use a wastegate, because I have yet to find a controllable bov, that works like the WG does with the turbosmart MBC.

Does that ^ sound dumb? or way out there?
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Old 03-02-2012, 11:29 AM
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Or just get a 4 psi wastegate
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