What would be a good target a/f ratio for around town and highway driving. Do I want a 14.7 or do I want to be on the rich side?



This is in a no boost vacume situation btw. I have been driving around w/ my laptop hooked up tweeking the car as I drive. (now I look foward to red lights to adjust it) My car seems really happy just a tad below stoich. Like 14.7-14.0 I have a lambda readout so I am reading 1.0 - 0.92. This motec is like learning to read another language sometimes. I need to see if I can change the map and temp from kpa and celcius.



I would really like this thread to turn into a tuning tips and opinions thread. I am a newb to this so any input is welcome.

while steady state cruising you have 2 choices.



1. if you have a cat it needs to be 14.5-14.7

2. if have no cat you can go leaner, until it starts to buck, on mine i can go about 15.5 before that happens but its port/exhaust/compression/# of rotors related



the factory tuning in these ranges is between 1500-1700rpms and 3500-3800 it runs off the o2 sensor at 14.7:1. and thats a good place to start.



over 3800 it goes full rich, and since you have a faster ecu you can kinda ramp it up ie at 4k go to like 13.5:1 maybe keep it there all the way up, but really nobody cruises that high