Is it too lean for Induction kit?
28 November 2001, 02:04 PM
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Guys,
I have a MY94 WRX wagon with full decatted Magnex exhaust. I have been thinking of replacing my K&N panel filter with an induction kit but would like some advice first.
If I fitted an Induction Kit do you think the car would be running too lean to be safe?
I had my car MOT'd recently and I think I had a value of 7% CO can you tell from this how lean it is running?
Is there any other way of telling whether I'd be safe fitting an induction kit?
TIA...
I have a MY94 WRX wagon with full decatted Magnex exhaust. I have been thinking of replacing my K&N panel filter with an induction kit but would like some advice first.
If I fitted an Induction Kit do you think the car would be running too lean to be safe?
I had my car MOT'd recently and I think I had a value of 7% CO can you tell from this how lean it is running?
Is there any other way of telling whether I'd be safe fitting an induction kit?
TIA...
28 November 2001, 05:30 PM
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7% CO is the roughly the equivalent of the lambda target the Link ECU comes set with as default for >1.0bar boost on MY99/00 UK spec if that helps.
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29 November 2001, 01:57 PM
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MAF should compensate, but MAF can under-read with induction kits due to smoother air flow than standard. In practice this has been implicated in lean problems - see Stephen Done's thread in Drivetrain a month or so back with induction kits and strange dyno results.
Your MOT tester would have been testing CO at idle or fast idle. If the MAF is reading correctly then it should compensate fuelling. 7% CO would be appropriate at wide open throttle, full boost is what I am saying. 5% CO might be more appropriate at idle once warmed up since you don't have cats.
If anything it sounds rich at idle based on the above but I am no expert. I have only looked at things to try and interpret lambda voltages when altering boost.
Your %CO at idle tells you nothing about how lean it could run on boost which is where you risk det in an import rather more than a UK car given the setup for 100 octane.
To know for sure you need it checked on a rolling road or with a select monitor or lambda link.
[Edited by john banks - 11/29/2001 2:00:59 PM]
Your MOT tester would have been testing CO at idle or fast idle. If the MAF is reading correctly then it should compensate fuelling. 7% CO would be appropriate at wide open throttle, full boost is what I am saying. 5% CO might be more appropriate at idle once warmed up since you don't have cats.
If anything it sounds rich at idle based on the above but I am no expert. I have only looked at things to try and interpret lambda voltages when altering boost.
Your %CO at idle tells you nothing about how lean it could run on boost which is where you risk det in an import rather more than a UK car given the setup for 100 octane.
To know for sure you need it checked on a rolling road or with a select monitor or lambda link.
[Edited by john banks - 11/29/2001 2:00:59 PM]
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