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-   -   mbc no good for low psi? (https://www.homemadeturbo.com/forced-induction-7/mbc-no-good-low-psi-79428/)

WTF 06-25-2007 11:13 AM

Re: mbc no good for low psi?
 
i got an 11.somthin psi spring too, might just throw that in there, what will 11psi on a ford 60/63 on a Ls motor do?

Minor Threat 06-25-2007 12:09 PM

Re: mbc no good for low psi?
 

Originally Posted by WTF
i got an 11.somthin psi spring too, might just throw that in there, what will 11psi on a ford 60/63 on a Ls motor do?

Be a lot of fun to drive?

jeffescortlx 06-25-2007 03:52 PM

Re: mbc no good for low psi?
 
Why not shim the 6 pound wastegate spring to what ever you need and not even use the MBC?

WTF 06-25-2007 05:33 PM

Re: mbc no good for low psi?
 
i made a post about that actually, i was thinking about that but its gona be a bitch taking it apart and shimming it until its right, probly just gona run 11psi :1

samson 06-25-2007 09:00 PM

Re: mbc no good for low psi?
 
Run the 11psi spring and it will end up being about 9.67psi anyway due to IC pressure loss DEPENDING on your vaccum source (manifold = higher, turbo = lower).


JP

biscuit 06-25-2007 10:03 PM

Re: mbc no good for low psi?
 

Originally Posted by hard2obtain
you need to cut the spring a little, i do that, now i can go from 6 to any psi

note: i use an internal wastegate set at 6psi

+1

Easiest thing to do...


losesomethinbra 06-25-2007 10:16 PM

Re: mbc no good for low psi?
 
One question... If you were to use an electronic boost controller would that help reduce spool time by keeping the wg closed until the last possible second?

Ok I looked into it and the answer is yes.. But does anyone here know if its really that big of a difference? It doesnt sound like a big deal unless I'm competing in drag events trying to shed one tenth of a second...

Minor Threat 06-25-2007 11:46 PM

Re: mbc no good for low psi?
 

Originally Posted by losesomethinbra
One question... If you were to use an electronic boost controller would that help reduce spool time by keeping the wg closed until the last possible second?

Ok I looked into it and the answer is yes.. But does anyone here know if its really that big of a difference? It doesnt sound like a big deal unless I'm competing in drag events trying to shed one tenth of a second...

You will probably fry tire regardless of how quick your turbo spools, so until you fix your traction issues, don't worry about it.

lkailburn 06-26-2007 02:11 PM

Re: mbc no good for low psi?
 
i had a cheap egay mbc that did the same thing. couldn't go any lower than 11psi. ended up just not using it for the time being because even cutting the spring didn't change anything. maybe i didn't cut enough off.

-Luke

samson 06-26-2007 07:14 PM

Re: mbc no good for low psi?
 

Originally Posted by losesomethinbra
One question... If you were to use an electronic boost controller would that help reduce spool time by keeping the wg closed until the last possible second?

Ok I looked into it and the answer is yes.. But does anyone here know if its really that big of a difference? It doesnt sound like a big deal unless I'm competing in drag events trying to shed one tenth of a second...


If I'm not mistaken, that's how external gates work already, but I think I'm wrong...I forget. Internal bleed and fluctuate and suck.


JP


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