sonix7

alright here is the background. I have a stock turbo set-up, DP, intake, Med SMIC the high flow cat is coming soon . I just bought a PFC and an Innovate WB02 uninstalled. I had sequential problems after a hose job so I diagnosed that sucessfully. When I got it fixed I tested the pattern and I was getting creep on the secondary transition. I saw the needle hit like 14 and I let off the gas, this was getting on the freeway. So I ordered a MBC, I installed that but I have not dialed it in. Here is my question, I am installing the PFC, should I keep the MBC on and dial it in before I install the PFC? or should I take the MBC off and use the PFC to control boost? or both. What is my best scenario with this? all opinions and/or guidance is much appreciated. Thanx

NeoTuri

iTrader: (2)

To be honest, I've not been able to get the PFC to reliably control max boost, but that's just me.

I'm currently in the process of installing a MBC.

sonix7

should I take it out and let the PFC do learn mode and then put it back in to control max boost? I am just worried that if I leave the MBC it will mess up what the PFC learns and reads, is there something I am missing?

twokrx7

iTrader: (1)

Hope I don't come off as an ******* bit it sounds like you got a boost spike at transition? Creep occurs at higher rpms well past transition due to open exhaust and your mods indicate a stock main cat and catback; this should net zero creep. Maybe the hose job messed up stock boost control resulting in a spike at transition?

sonix7

your right it was a little spike. I don't know about if that caused a problem but I tested every piece of the control system for proper operation. I am at a mile higher than sea level, if that has anything to do with it. My friend that has nearly the same set-up, he has a high flow and I do not, has the PFC and says it controls his boost and he also does not get any spikes or creep. So maybe the stock cat is causing my problem? I am getting a bonez soon. Will the MBC conflict with the PFC learning the stock boost pattern when I install it? I have the stock pill and can replace it easily. What do you guys think?

books

iTrader: (8)

I was helping someone setting up the target boost by adjusting the duty cycles via the Commander. The boost level would not rise. Later I learned he still had his MBC connected.
He disconnected it and now the PFC is allowing him to reach his target boost.

I have had success using the PFC to control boost, but others have not.

I would suggest using the PFC to control boost without the MBC and if the PFC does not control boost to your satisfaction, you can later hook up the MBC.

sonix7

good advice books, thanx. this is what I am gathering from all my research . I think you helped me make my decision.

books

iTrader: (8)

thanks

OKRX-7

I have needle valves in place of the pills on my seq setup and use the PFC to adjust the solenoids and it boosts great, holds rock solid at 1 kg/cm2 (14.2psi). I also have a ported wastegate and midpipe though.

TwinTriangles

Ive been using just my PFC to control boost for quite some time now. It works great but I was limited to 14psi as anything above it could not be controlled. If you want help setting it up let me know, I live in fort collins also.

alberto_mg

I had difficulty controlling boost in 2 FDs running Power FCs. One had minor mods - DP, cat back, small SMIC; the other has major mods - full exhaust, FMIC, injectors, street port etc. The biggest problem was in the colder winter months where I had it set at 10psi and it would run 12psi. No amount of dialing duty cycles down would work. In both cases I installed a used Greddy Profec B Spec 1 and it fixed the issue.