SAFC tuning question

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300max
Posts: 181
Joined: Tue Apr 01, 2003 8:23 am
Car: 1995 240sx ka-t 1997 Maxima SE

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My vehicle is a 95 240sx with Z32 maf and SAFC II 370cc injectors.

This is a 30 second log file during idle and minor throttle input (I was repositioning the car in the garage so a few backups and then a pull forward).

The purple line is the AFR and the redish line is the throttle %. I couldn't exactly calibrate the throttle percentage so the .1% reading and -.2% should be equated to 0% or no throttle input.

SAFC settings are -27% across the board hi and lo and the rpm point (Ne01) to alter air flow is set at 1000.

My question is how do I affect the AFR at idle if the the idle is less than 1000 rpms.

Should I lower the first rpm point (Ne01) to 800 rpms?

Also observe how the AFR jumps up after a minor throttle input (8.1%) and then bottoms out a soon as the throttle is released.

What causes that and should I be concerned?

Thanks
Modified by 300max at 11:18 PM 1/7/2005


skatanic28
Posts: 397
Joined: Thu Oct 10, 2002 5:35 am
Car: 96 240sx

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your idle seems really rich. i have the lowest correction point at 600 on mine, so it affects the idle still....in the high 14's low 15's. was the motor cold for this? what are your hotwire settings?

under light throttle the afr should still be mid-high 14's so i wouldnt worry about that. usually on decel my afr's go pretty high but that doesnt concerm me much, thats strange how yours go to 11.


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