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Pfc Boost Controller Problems

Robo's

By Robo's,
in Engines & Forced Induction

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Robo's Mentor

Robo's

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Just installed my PFC Boost Controller. Now i had to buy the AVCR Pressure sensor which i beleive is the same. Anyway, ive got 2 problems with it.

1) It reads less pressure than my boost guage and stock guage. Max pressure i see is .7 when im running at least 17psi on my guage. Even when my boost and standard guage are on zero, the PFC shows a negative pressure. I teed the T-Piece off the same line as the stock guage.

2) I am getting no midrange boost. It shows 10psi then bang at 4000rpm i get 16psi in a flash. Its like something is holding it back and then it clicks and i get boost and power. Its not the turbo as witth my HKS adjustable actuator i was getting heaps more power down low. The only change was lengthing the arm on the actuator.

Ive been reading that these computers learn boost but how long does it take?

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Robo's Mentor

Robo's

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Further testing, i just cannot seem to get any decent boost under 4000rpm, (only 11psi)and then bang it shoots to 17psi just like a switch. I might change actuators, ive changed all the settings (boost and cycle) and it doesnt seem to be doing anything to solve this.

If all fails, i'll be disconnecting the PFC boost controller and using the good old reliable HKs actuator arm as my boost controller, then i can get alot more boost down low.

Sydneykid Grand Master

Sydneykid

Posted
Posted

Suggestions follow;

Problem #1. My guess is you have a wiring error, test it out by placing a multimeter across the MAP sensor output. You should see consistent and linear voltage changes as the boost changes. If not, you have the earth/active/sensor wires mixed up.

Problem #2. Most likely related to problem #1. Just to be sure I would check the vacuum hose connections carefully, you may have the in and outs crosssed over. The Apexi solenoid is a normally closed style, no voltage = closed vent). Apply 12 volts and make sure that when you blow in the fittings, the solenoid opens the bypass vent.

Hope that helps

:) cheers :)

Robo's Mentor

Robo's

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I think i must have crossed the wires somewhere, i will check again. Maybe the voltage coming out of the map sensor is reading in the wrong PFC connection. I just hope if i swap it, it doesnt burn my PFC out.

Changed actuators and problem 2 is now fixed, im getting at least 15psi at 3500rpm now, much better.

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