Quote:
Originally Posted by Sliderintrainin
the kouki blacktop type x(1997-1998) came with a skinny 02.
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The S13 1998 Type-X Blacktop SR20DET engine came with a J4 ecu and a normal fat O2 sensor.
They stopped using the skinny O2 after the 1992 redtops , iirc.
My $.02:
Buy an AEM wideband gauge, and use the narrowband analog output configured to your desired cruise A/F Ratio. I set mine around 15.2-15.5 for best fuel economy. A redtop ECU automatically jumps to about 1A/F richer during idle after a few seconds, so it will idle around 13.8-14.1 and cruise around 15.2-15.5 when set this way.
This scenario gives you a wideband, which is an amazing tuning tool as well as insurance for the engine in a long term scenario, and will support any modifications you make with assurance the engine is running like it should be... And you get the benefit of a closed loop at whatever air fuel you desire.
This is how mine behaves, your experience may differ!