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Power FC - Can anyone see anything wrong with this?

BoOsTeD_RB26
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BoOsTeD_RB26 Experienced

BoOsTeD_RB26

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People,

Last night I took my car for a nice little drive, only to have the check engine light come on, but only once for some reason.

Can anyone see anything wrong with this?

The peak readings were as follows:

Injector Duty: 74.9%

Ignition Timing: 35 Deg

Air Flow: 4740 mV

Engine Rev: 7552 rpm

Speed: 97km/h

Air Temp: 47 Deg

Knock: 19

Water Temp: 80 Deg

What could it be? Car is running beautifully, no hesitations, nothing. Just curious as to why the light popped on for a little bit. Obviously isn't detonation because the knock reading is really low, only thing I can think of is maybe AFM's (which are RB25DET units)?

Anyone shed some light?

BoOsTeD_RB26 Experienced

BoOsTeD_RB26

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Injector Duty Cycle, AFM and Knock all set it off...

The only one even close is AFM voltage, but I didn't think that 4.7V was enough...

That's EXACTLY what I've been thinking. The max voltage for the AFMs is something like 5.1 or 5.2 volts or something. But even still, it's still not enough. Hmmm.

Any PFC gurus out there?

raz0r$harP.UK Grand Master

raz0r$harP.UK

Posted
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From the PFC manual:

・The lamp will illuminate when the pressure sensor is at maximum capacity

・During detonantion, the lamp will flash 3 times in 0.1 second intervals

・The lamp will flash for 0.5 seconds when the injectors are at maximum capacity

paulr33 Grand Master

paulr33

Posted
Posted

yeah as other have stated it will come on (if enabled as well in the setting menu) when:

injector duty hits 98%

airflow meter value hits 5.1 volts

knock reaches what it considers "excessive"

in your case those max values for afm and inj duty look fine so it would be safe to assume it was knock given you didnt post the knock value? you can make it so it only flashes engine light for knock by disabling inj duty and afm warninig

Sydneykid Grand Master

Sydneykid

Posted
Posted

On the 3 warnings (AFM, knock, inj) the PFC has adjustments for the thresholds. Check your settings as I have seen a knock threshold set at 20, usually it is set at 40 or 60. Using the Datalogit, we have found that the peak readings recall seems to need more than 1 event. If you had like 21 knock for a millisecond it may be enough to get the warning light to flash once. But the recall needs maybe 2 milliseconds to log it.

My advise, don't strees, move on:cheers:

BoOsTeD_RB26 Experienced

BoOsTeD_RB26

Posted
  • Author
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yeah as other have stated it will come on (if enabled as well in the setting menu) when:

 

injector duty hits 98%

airflow meter value hits 5.1 volts

knock reaches what it considers "excessive"

 

in your case those max values for afm and inj duty look fine so it would be safe to assume it was knock given you didnt post the knock value? you can make it so it only flashes engine light for knock by disabling inj duty and afm warninig

Just wanted to point out that the knock reading was 19 (as in first post). Nothing to worry about.

As for the pressure sensor, I don't have one, or rather it's been disabled, as I have a boost controller "external" to the Power FC (profect B).

Boost is currently set at 1bar.

Might have to go and see someone with a datalogit so they can have a look at these thresholds.

Thanks a million people!

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