barkeep

Can the powerfc control boost when there are no pills in the lines leading to the wastegate actuator and turbo precontrol?

My powerFC is not controlling boost at all, and I thought maybe it was because those pills were removed when my original boost controller was removed. I installed the dawes device (manual boost controller) on those lines as a method of debugging my problem. I could control boost with that device.

I'm worried that when the installed the powerFC, they cut the wrong computer wires.

Also, My manual boost guage always reads about .1 bar higher than my powerFC reads. Is this normal?

-confused

es

I'm pretty sure you need restricion orifices. Even with a boost controller you need the PC restrictor orifice!

The Power FC doesn't measure boost in Bar. It's KGmm^2 which = 0.980665ish Bar.

barkeep

the PC restrictor orifice?

es

Pre-Control restrictor orifice. Commonly referred to as the Pre-Control Pill...

barkeep

ahh ok. I did'nt know the term.

So with that precontrol pill, you can still control boost with the powerfc?

es

Yes. Those pills are part of the factory boost control system.

The flow circuit goes:
Pressure from the primary turbo snail through the pill to the actuator (meaning the pill is restricting flow. Later model FDs had the restriction built into the hose nipples), This pressure opens the actuator, opening the WG door by colapsing the 7LBS spring. The ECU (factory or PFC) raises boost by venting that pressure from the actuator via the side nipple on the actuator, which connects to the hard metal pipe bolted to the front of the engine, then a rubber hose connects to the Solenoid valve that's bolted to the UIM. (the PC system is the same, but the sol valve is switched at different times for different reasons. RPM vs: Pressure)

& that is how they get 10PSI from a wastegate with a 7PSI spring.
Eric.

cewrx7r1

iTrader: (2)

And, the PFC in most cases does read boost incorrectly low! Do a search on this forum about it, as this is always a PFC newbie question.

es

Hey Chuck. I adjusted my offset through the datalogit to 3600 which zero'd the commander while the engine was not running. That is at sea-level in Florida so I'm sure different settings would apply for different areas.

Since I've done this I've seen pretty accurate readings between the autometer & the Commander. I will upgrade to Defi gauges but I've spent lots already just bringing the car back to life, I am moving in a month, the car needs a paint job...

particleeffect

i'm confused here. i take it that the PFC only controlls the WG solenoid duty cycle, so i understand the need to control the PC on my own. but i'm lost when it comes to the WG/secondary turbo boost control.

do i need restriction in the WG line? i know running the hose unresiticted to the WG actuator would normally run 7 lbs of boost, but that is on the stock ECU's duty cycle correct? since you change the WG duty cycle electronically with the PFC, i don't understand the need for a restriction here, seems like it would just restrict the responce of the WG to run what you set it at.

particleeffect

nm that. i take it the PFC controlls both solenoids. which begs the question of why we need restriction in either line? right now i'm running HD valves and i don't have my pills anymore. so if i can just hook up the hoses straight it would help alot.

particleeffect

ok, i can't control boost at all either. no restriction in my lines either. and while i haven't found any reason as to why the PFC would need such restictions i guess i'll have to try them out again.

so can anyone tell me the PFC boost settings for a stock 10-8-10 pattern so that i can retune my bleed valves for such, and then go from there with the PFC?