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Power FC power FC boost setting, bar, atm or kg/ccm2

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Old Aug 29, 2003 | 01:29 PM
  #1  
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power FC boost setting, bar, atm or kg/ccm2

I did some research that showed me 1 ATM =14.7, 1 bar=14.5 and KG/CCM=14.22 psi.

when I set my power FC lets say to 1.0, is that setting it for a target of 14.22?

and after I run, lets say it peaks at .80, does that mean its .80 X 14.22? Or is it displayed in bar or ATM?

Kinda confused thanks.
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Old Aug 29, 2003 | 06:51 PM
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The PowerFC uses kg/cm² for setting and displaying boost, so multiply by 14.22 to get PSI.
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Old Aug 30, 2003 | 11:56 AM
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heres the formula i got. . . . psi = (???)kg/cm^2 / 0.0703070

rock on. hahaha.

paul
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Old Aug 30, 2003 | 03:27 PM
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That is fine except the PFC in most peoples cars show boost incorrectly. Most PFCs show a lower boost than what is true. Notice that with power on and the engine off, the PFC show vacuum.

In my case, at 15PSI by boost gauge, my Blitz controller with it's own pressure sensor shows 14.7, and the PFC shows 13.4.

The PIM voltage on the PFC will be correct for the PSI by the Mazda manual.

Hook up your map sensor and boost gauge to a controllable pressure source. I use a hand air pump.

Then start at say 9 PSI working your way up to 18 psi. Do multiple test at each PSI recording the pressure of all devices. This will give you an idea of what is going on and which device is more accuarate.
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Old Aug 30, 2003 | 03:40 PM
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From: Buckhead
Originally posted by cewrx7r1
That is fine except the PFC in most peoples cars show boost incorrectly. Most PFCs show a lower boost than what is true. Notice that with power on and the engine off, the PFC show vacuum.

In my case, at 15PSI by boost gauge, my Blitz controller with it's own pressure sensor shows 14.7, and the PFC shows 13.4.

The PIM voltage on the PFC will be correct for the PSI by the Mazda manual.

Hook up your map sensor and boost gauge to a controllable pressure source. I use a hand air pump.

Then start at say 9 PSI working your way up to 18 psi. Do multiple test at each PSI recording the pressure of all devices. This will give you an idea of what is going on and which device is more accuarate.
im not concerned about accuracy. I have water injeciton, so with that system I have a pressure switch that I set at 8 psi with a mitty vac. Well my boost gauge shows 8 psi, the boost switch activates, so I know my boost gauge is more accurate. I need to know because of the pfc's overboost fuel cut off. its cuts if its over 25 pct over your target boost , so I'm trying to figure out my settings.
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Old Sep 3, 2003 | 11:12 AM
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Originally posted by cewrx7r1
That is fine except the PFC in most peoples cars show boost incorrectly. Most PFCs show a lower boost than what is true. Notice that with power on and the engine off, the PFC show vacuum.

In my case, at 15PSI by boost gauge, my Blitz controller with it's own pressure sensor shows 14.7, and the PFC shows 13.4.

...
I don't see near that much of a delta between a 3-bar GM map sensor with the PFC and the sensor from my AVC-R. I also see both zeroed out at power-on (engine-off).

Last edited by Badog; Sep 3, 2003 at 11:14 AM.
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Old Sep 3, 2003 | 02:19 PM
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ZeroBanger...

It's not 25% over your target boost, it's 0.25 kg/cm² over your target (page 28 of the PFC manual). E.g, if target boost is set at 0.80 and you hit 1.05, it will fuel cut. If target boost is 1.0, you'd have to hit 1.25 to fuel cut.
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Old Sep 3, 2003 | 02:45 PM
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From: Buckhead
Originally posted by skotx
ZeroBanger...

It's not 25% over your target boost, it's 0.25 kg/cm² over your target (page 28 of the PFC manual). E.g, if target boost is set at 0.80 and you hit 1.05, it will fuel cut. If target boost is 1.0, you'd have to hit 1.25 to fuel cut.
I understand thanks. take 1.0 X 1.25 and you get 1.25 or 25 pct. Its all the same to me.


Last edited by ZeroBanger; Sep 3, 2003 at 02:47 PM.
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Old Sep 21, 2003 | 05:31 AM
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Originally posted by cewrx7r1
That is fine except the PFC in most peoples cars show boost incorrectly. Most PFCs show a lower boost than what is true. Notice that with power on and the engine off, the PFC show vacuum.

I have noticed the exact same thing. My Boost contorler shows exactly the same as my boost gauge, but my pfc is always low. Even when the car is off. The Boost controler and gauge will show 0.00 and the pfc shows .200 or so.
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Old Sep 22, 2003 | 01:45 PM
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I lied, it is closer to .035 or so.
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