Houdini

iTrader: (3)

I'm doing a little budget planning here. I want a PowerFC. I also want to control boost. I hear that the PFC is not good enough to control boost accurately...right? Does it use the stock solenoids? Now, I see that a lot of people use the AVC-R to do the boost control. But I've also seen that Apexi makes an add-on solenoid for the PFC using the same technology as the AVC-R. It's a little cheaper than the AVC-R but not by much. What's the advantage of the AVC-R over the PFC add-on since the PFC does all the fuel management? or does it?

abflug-t78

use the solenoid from the avc-r kit, its the same one apexi will sell you anywas

Little 7

I got the same question with you coz I just got my PFC but I am thinking to buy the add on boost controller kits or buy a Profec B.
Does anyone have comment on the add on kits? Thanks

damian

iTrader: (2)

a lot of people have said the PFC does not control boost well, however, we do not know how many of those are using the stock solenoids, so it may be the stock solenoids causing the bad control, not the pfc.... what we need is for the people who get the PFC boost control to work fine to tell us weather they used sotck solenoids or an upgraded one...

rynberg

For $300 (or less used), a Greddy Profec B works great and is simple to use and tune. It's very easy to switch between the two different boost settings (or turn it off to run 7 psi).

The problem with the PFC is you are just guessing with the duty cycle values and when the weather changes, your settings will not have the same effect. It's also more difficult to switch between boost settings (albeit, not much).

insomniac

iTrader: (5)

Just get a Profec B
It's like "Boost Controller for Dumbies"

I have one, Rynberg also has one. We're both satisfy. Plus the price is right.
Set it and forget it!

cruiser

I got ProfecB from this forum for $200 used, as new.
Still waiting to get my car back from the service though. I hope Jason sends my Koyo soon so I can put it back on the street.

FormerPorscheGuy

Profec B all the way.

DaedelGT

Get the B. I ordered mine already

Houdini

iTrader: (3)

OK, here's a crazy question. Why is the solemoid valve for the AVCR only $149? 2003 Apexi Price List
or is that just parts of the solenoid?

911GT2

KDR in PA is installing my profec B with my new engine. They know I'm getting a PFC and have no problems with it, so I'd say get the B.

I have heard a lot of people complain that the PFC does everything but control boost well. So i got the profec first, because boost control is more important than fueling (if you leave it at the stock 10psi) to me.

xph

My understanding of the PFC is that the duty cycles you put in are just a starting point... The system actually learns your boost to control it.. While I dont think it is great at contolling boost as it can make mistakes, I think it is alot better than the B... My friend who has a be has to adjust it for temp practically every time he drives here in WI... Huge differences in air density between 50deg, 70deg and 90 deg.... it is like he has to play with jets on a carb... I on the other hand always seem to be within one or two PSI of my target boost, and if I go over it is just for an instant (like a spike), as the computer adjusts....

X

rynberg

The Power FC does NOT learn anything about boost. It controls boost by blindly opening the wastegate from the set duty cycles. Most people DO have to change the settings when the weather changes -- and I certainly don't count being within 1 or 2 psi as accurate boost control.

My Profec B has controlled boost to within 0.5 psi since it has been installed. It gives me the same boost setting at 40F and 90F. Your friend needs to tune his Profec better if he is getting different boost levels with temp changes.

xph

We are both wrong... The way the PFC works (according to the Datalogit manuals) is that it attempts to control the boost to the desired level by controlling the wastegate directly. In order to improve spool times, you should set a duty cycle close to the desired boost level you want. if you are under (as I must be), the PFC takes over boost control too soon, making the turbos spool slower, but there is very little chance of overboosting. If you are too high, then you will spike before the PFC starts to regulate the boost..

I suppose if you tweak this number on a low air density day, you would over boost on high air density days as you suggest.

The Datalogit manual describes the duty cycle as
"Duty; Duty setting determines the Waste Gate Control Solenoid’s initial position (% opening) before the Boost Control system starts to control boost"

X

I was under the impression that the PFC would learn where to start controlling boost and just used your duty cycle as a starting point... I see now that it does this each boost cycle, and indeed does not learn anything about your boost...

rynberg

Thanks for the correction, xph. My friend David fought with the PFC controlling boost for several months before he got it how he wanted it. I have anti-PFC boost control feelings from his experiences. The other advantage of the Profec B is I control boost using a nice new solenoid mounted in a cooler place, instead of the old heat-blasted stocker.

Alien7

iTrader: (1)

Hey I just installed this:

https://www.rx7club.com/forum/showth...hreadid=192249

works great!!

SPOautos

I just use a Hallman Pro, seems to work great for me

STEPHEN

vudoodoodoo

There a lots of boost controllers for sale on eBay for good prices. Profec B's/A's, HKS EVC's, etc.
There is a Blitz SBC for sale for $170 in the for sale section. Good deal IMO.

apneablue

Rynberg helped me tune my Profec B and it's freaking awesome...I have stock solenoid and tried using the PFC to control boost and it didn't work for me....The Profec B is truly boost control for dummies. I vote for both PFC and ProfecB.

R1Outcast

Okay, I'll probably get flamed for this, but I honestly need to know. It's my understanding that the PFC is for cars that are going to be running higher than stock psi. Am I right or wrong about this? If I'm right, then for someone who's happy with 10 psi, would a boost controller (ProfecB) alone be fine? Or is a PFC still needed and why?

potatochobit

iTrader: (1)

why does everyone like the profec B? i thought the blitz dual SBC ID2 was better for the FD?

R1Outcast

...anybody?

Scrub

iTrader: (25)

Do you have to do anything special to run the profec B with the PFC?

Houdini

iTrader: (3)

anyone have a diagram showing where the solenoid for the Profec B installs in the engine compartment?

insomniac

iTrader: (5)

Let it sit to the corner on the passenger side, next to the abs unit. I'll try to take a picture later tomorrow.