Apexi pfc boost controller instructions

[RB power]

hi does anyone have english instructions for the Apexi pfc boost controller kit?

[RB power]

mmm does anyone know how to use one of these?

[Sydneykid]

mmm does anyone know how to use one of these?

It is pretty simple............

There are 2 settings, Boost (that controls the amount of boost) and Duty (that sets the solenoid duty, controls the boost climb rate). There are 4 options for boost level, I have mine set as follows;

0.70/48

0.80/54

0.90/60

1.00/66

So 0.7 bar has a fast climb rate and 1 bar has a slower climb rate.

Hope that is of some help:cheers:

PS, there are instructions in the Commander manual.

[RB power]

cheers..

the instructions i have are in japanees... and the only english one i can get is for an rx7

[snake]

Just on this topic, Does the Map sensor for the boost controller need to read negative pressure from the manifold, will it be quite happy just to be plumbed into a intercooler pipe? Thanks.

[Peter Wilson]

Hi guys,

I now have my PFC boost control kit hooked up, and it doesn't seem to follow the logic above....

1 0.70 kg/cm2 48255

2 0.75 kg/cm2 50 255

3 0.80 kg/cm2 54 255

4 0.85 kg/cm2 56 255

When I set the max boost for 0.85 kg/cm2, the duty cycle seemed to affect actual boost more than the boost setting.

ie: 0.85 48 gave 0.7 kg/cm2

0.85 70 gave 0.9 kg/cm2

I mucked around and found that 0.85 66 gave the correct 0.85 kg/cm2 max boost level. This seems to match the Apexi AVC-R instructions

which say:

"When max boost of ACTUAL driving is HIGHER than target boost, adjust the duty LOWER. If the max boost of ACTUAL driving is LOWER than target boost, set the duty HIGHER"

This doesn't make sense to me, as the whole point of closed-loop boost control is that the ECU should work out the correct solenoid duty cycle from the pressure sensor, not need to have it keyed in!

Also, if the boost is really controlled by the input duty cycle, this makes a lie out of altering boost climb rate by changing this variable...

Two other things have me wondering:

1) Why are their four lines for different boost levels?

2) There is a third column, which is set at 255 for all rows and can't be changed via the hand controller - what is this number?

Any help welcomed (especially from Sydneykid!)

Cheers, Peter.

[Bass Junky]

Hey There.

I also have the PFC boost control.

The way it works is that the 0.8,8,9,1.0 Bar settings sets the max HELD boost. You will find that no matter what the other setting is, on sustained full throttle, the boost kit will hold at that boost.

It may spike however if the duty cycle is too high a number, which will bring boost on really fast, it will spike and then settle down to the max boost number.

The 255 bit, is a non user adjustable display. When you change the max boost number, this goes back to 255. Once the PFC has learnt how to control the set amount of boost, this number will change to a different number, which is simply a display number. You cannot adjust this.

You should asjust the gain so that you don't spike the boost. You can check this by watching the line graph whilst ramping through the boost.

BASS OUT

[Peter Wilson]

Thanks Bass,

That makes sense - the peak reading I was getting was from the peak-hold function, and the actual boost may well have settled back down to a steady 0.85 after the spike. I will look at the trace line more closely.

Sounds like the duty setting I have now is as aggressive I can get in boost climb rate without overshooting.

Nobody has an answer on why there are 4 lines tho' - if you can control steady peak boost with the first number and climb rate with % duty cycle, why do we need any more than one line of code?

I will keep my eye on the 255 number, but it has not changed so far...

Cheers, Peter.