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Old 09-10-2005, 02:52 PM   #24
2phless
Scooby Specialist
 
Member#: 69343
Join Date: Aug 2004
Chapter/Region: South East
Location: 'tween Lewisville&Clemmons NC
Vehicle:
1998 TransAm cnvrtbl
Black

Default

I like Ride's MBC better than mine, but here is how I did it to get some control to my fingertips.

I used the TurboXS dual stage MBC. It is not a ball and spring BC but a bleed-off style BC similar to the ABC that comes with the UTEC. Difference is this one always has a little bleedoff, and the nipple for it's inlet port is restricted to about the same size as the stock 'pill'. That could be replaced with an open port but I just pulled out the stock restrictor and replaced it with this setup, stage 1 closed all the way.








Like this it acts like the ABC to give the solenoid settings a little more headroom. And by swapping the pill for this part closed I gained about 1 psi across the map. So it won't take a lot of change to the map to get it set back the way you want it.

I have stage 2 turned out 2 turns and is activated by the UTEC's built-in AND activated output solenoid. It's designed to come on over XX rpm at XX tps etc... and I use it to fightof the taper. Which is not so bad anymore now that I installed a larger helper spring.

I have a manual activate button (momentary so I have to hold it to get the 2nd stage to open on the TXS BC.) And in solid full boost situations that'll bump the boost up from about 20 to about 25? (where I rease the button in a hurry so it might go higher... I'm not that curious.) But above 5.5-6k areas it just helps the taper and keeps me well above 15 psi like I used to see.

Although it's a little outdated, I'm on the front page of this site with a list of most of my mods.

www.subarusti.org
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