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Old 06-02-2003, 04:04 PM   #1
Jon Bogert
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Member#: 1133
Join Date: Mar 2000
Location: SE PA
Vehicle:
09 GTR, 02 996 C4S
95 993 C4, 71 911, 04 STI

Question Stock MY00 ECU fighting RRFPR?

Bert at Union 7 was messing around with the formerly Rimmer supercharged 2000 RS (not mine) which now has a low pressure turbo, much like mine. He's observed some strange behavior that I don't recall being discussed here.

Ideally, a properly tuned RRFPR will keep the mixture correct under boost. The O2 sensor is happy, the ECU is happy and the car runs fine.

But if you make the mixture slightly rich for best response (and safety at the critical 4000RPM point), the ECU will gradually pull back the injectors to reach a mixture that matches it's settings. Bert noticed this behavior after resetting the ECU, then driving around with a wide-band O2 sensor hooked up. The ECU would gradually learn to defeat the RRFPR.

I recall reading quite a bit about this happening with a S-AFC on a 00-01 car, but not with an RRFPR.

Let me know what you think...
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Old 06-04-2003, 02:53 PM   #2
Jon Bogert
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95 993 C4, 71 911, 04 STI

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Huh--nobody knows anything about this? Or has it been covered so much that everyone's bored of talking about it?

Just to recap, the stock ECU defeated the RRFPR within 30 seconds after a reset. Scary stuff...
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Old 06-04-2003, 03:43 PM   #3
dyswtric27
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Wow i am a little surprised. What rrfpr are you running?

I ran a vortech 10:1 plate with my MY00 and it ran fine for awhile until i got the link. Just insanely rich, but no real bother there. I get confused on this, but shouldnt the ECM not bother with the 02 sensor while at full throttle, therefore just going by a preset map or does it actually adjust to compensate for a/f?
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Old 06-04-2003, 03:47 PM   #4
Jon Bogert
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Join Date: Mar 2000
Location: SE PA
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09 GTR, 02 996 C4S
95 993 C4, 71 911, 04 STI

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Bell RRFPR. But that shouldn't matter.

It seems that even when it goes "open loop" it's monitoring the front O2 sensor and altering it's open loop map. So the next time you floor it, it's using the revised map.
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