Sentra SE-R

[SpecV_Scott]

Yeah, that makes no sense. You push the shifter all the way to the right, then back.

Lancer_Jordan: PMed ya. And the Crank pulley install wasn't bad. I've been driving on it for almost 2 years with no problems. Definitely worth the money. Also, mine is NOT an underdrive pulley. IMO underdriving sux because you have less power going to the alternator, which makes your car idle like crap. The lightweight one simply replaces your 8lb pulley with an aluminum one that's the exact same size but only weighs 15oz!

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).

[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.

[BABY J]

[QUOTE=SpecV_Scott]
Lancer_Jordan: PMed ya. And the Crank pulley install wasn't bad. I've been driving on it for almost 2 years with no problems. Definitely worth the money. Also, mine is NOT an underdrive pulley. IMO underdriving sux because you have less power going to the alternator, which makes your car idle like crap. The lightweight one simply replaces your 8lb pulley with an aluminum one that's the exact same size but only weighs 15oz!
QUOTE]

True, but the alternator is regulated (gotta love solid state electronics), if you ever hooked up a voltmeter to an underdriven Spec, you will see that the volts are still the same as stock. But this effect WILL come into play, say... uhhh... at idle, w/ the AC on, headlights on bright, fogs on, and a big audio setup. LOL. Anything over idle though and you should be fine to underdrive.

[Sentra]

my safc has been tuned before, but are you saying that when i do install the light crank pulley, i need to retune? Cause that was NOT on my plan list...