So I am trying to explore running 24 - 30 psi using the stock BCS and ECU. Evo_Kid had a great writeup using new pills, but I have not seen the same results as he did and wanted to run some theory by some of you.

So my theory is that in addition to removing the pill before the BCS, could we add a MBC inline to the BCS and just bleed off additional air (crank the MBC to max psi) all the time or just use an inline T that bled off air all of the time? Then we could just use the WG duty tables to fine tune boost. This seems like it would be a lot easier than making a #58 or #59 pill. Thoughts?

FWIW - I replaced the factory pill near the turbo with a #58 pill. My WG duty settings last night were 95 and I was not able to get above 22psi in 3rd gear (really no different than stock pill with 127.5 wg setting). I have bumped the duty cylce up a bit this AM and will make a few runs after the kids have had breakfast .

I definitely understand why folks go the MBC route now and to all (including Warrtalon) I apologize for downplaying the effectiveness of the MBC. That said, I would still rather be able to figure this boost situation out using the stock BCS and ECU, although it may prove impossible....

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With the bleeder installed I can get 25+ psi easily....now I need help adjusting boost across gears (load) and improving the taper. See Post #3...

 

In theory, you can use both the stock system and a Manual boost controller..

1) an MBC is a restrictor system, so you would use it in place of the first restrictor from the vacuum source to set the base boost level

2) You can use the stock solenoid as a bleed system (as it is used stock) to do the additional control, since you would then use it to bleed additional air to provide fine control

In theory this works pretty well, in practice it doesn't do as well, but you can at least use the MBC to set your base boost to 20psi, and use the BCS to provide additional control.


Second theory..

Use a perrin solenoid in a restrictor configuration, where as the duty cycle of the solenoid increases, the line gets restricted more.. Similar to the MBC in some ways..

My honest opinion on the stock Boost maps are they don't offer the level of control I am looking for, so I use an external EBC (Apexi AVC-R) however if you take the time to set it up, and you have reasonable expectations, the stock system works pretty well.

 

OK well I have now got the stock system boosting much more than before and think I am very close to a happy compromise without the need for an EBC.

I installed a bleeder inline to the BCS (from the T) -- the bleeder has a #59 hole drilled in to bleed air to the atmosphere. I have done just a few runs but was hitting 25 psi in 3rd and 4th gear (and more like 22 / 23 in 2nd -- will need to do more testing). I set the WG duty cycle to 15 and boost limit to 275 and had the recommended error corrections (did not zero out). I did see a weird spike in 4th to 25/26 and then a what I will call blow off and boost drop to like 20 and then settle at 23...I wonder if I hit max load and the system tried to correct? (Sorry I was not logging but will do so tomorrow...)

With the WG duty at 15, I have a lot of room to improve the top end taper.

Any ideas? What do you think? Thanks to all of you for your advice.....