Quote:
Originally Posted by GuidoK
If it wouldn't be tuning you'd get an engine light with some obd2 code like p0171 or so.
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Not necessarily. My father burned up an engine about a year ago because it leaned out at high rpm... culprit was the fuel pump not keeping up with the demand. There was no check engine light.
As you increase boost you also increase the need for more pressure to pump the fuel, because the pump must fight against higher pressure in the cylinder. Granted this is not a turbo car and we're only looking at 8-9 psi, it definitely doesn't help the pump out. At 9 psi, the pump will have to create 9 psi more than on a NA motor to achieve the same pressure delta between the pump and cylinder.
Leaning a mixture out is dangerous. Most tuners want no more than 12:1 at full throttle, because detonation at high rpm can be catastrophic. The extra fuel also serves to cool the mixture.
Rated, I wouldn't run your car above 6500 rpm until you confirm that it's an inaccurate sensor. I would definitely install a wideband as soon as possible.