Sentra SE-R

[Big J]

As far as you SAFC....you have to get it tuned on the dyno. I gained about 8whp from tuning. Plus I get better gas mileage now (2-3mpg better on average).

You can tune it with a wideband data logger like a zt-2. Just tune it for a 13.1 a/f ratio, that's the magic number for the qr motor. The ECU will automagicly readjust the a/f ratio over time and adjustments below 50% throttle and 3000 rpms will instantly be overriden by the closed loop function and matain a 14.7 a/f ratio. If you have a data logger and some SAFC tuning knowlege you can tune it yourself. You can also cut/disconnect the primary and secondary O2 signal wires and the ECU will run in open loop all the time and never set any fuel trims, meaning your tune will never drift off (but you'll get an occasional engine light). I should have my SAFC-ll and ZT-2 data logger in the next week, I'll post some graphs when it's set up. You can also wire the throttle input of the safc to a MAP sensor (you have to add a MAP sensor) instead of the TPS (both are a 0-5v signal) and base adjustments on manifold pressure instead of throttle position (that's what I'll be doing). The ZT-2 will log a/f, tps, rpm, map voltage, egt, knock, ait, maf, and just about any other sensor you want to monitor.