Ok, I know I'm running rich cause my car has a bad gas smell and I get shitty gas mileage, so I bought myself an Apexi SAFC. My question is will I need a A/F gauge or a dyno to tune it, or can I do it just besed on readings from the SAFC itself? If so, how can I do it?

 

Shouldn't you be trying to figure out why the car is running rich?

Compensating for the problem will probably only buy you time before it gets worse. If you inadvertantly correct something and the mixture goes back to normal with the SAFC set to lean things out, you're gonna go POP.

 

if your gonna try and lean it out you should definetly get it dyno tuned. if you cant do that then at least make sure your using an egt & a/f gauge! not easy to tune off gauges if your a rookie though. im having a hard time. if you can afford some dyno time do it! it will pay off!

 

good point. Well how would I go about finding whats making it run rich? Know any of the common causes that I could check out?

 

The O2 sensor would be the first place to look, especially if your gas milage is really bad.

 

ok, ill check that today when I get home. How am I going to know if its bad?

And would I pass smog with a bad o2 sensor? Cause my car passed with flying colors.

 

so best thing to do is dynotune w/ a wideband o2?

 

To check the O2 sensor, replace it. If the problem goes away, then the sensor was bad.

Running rich is also a sign of sticky or leakign secondary injectors, or really bad primaries. Have your injector professionally cleaned.

 

how much an O2 sensor cost? And should I just pick one up at Kragen or something, or should I get it online somewhere?

 

You can get a generic O2 sensor for around $30...

 

A generic O2 sensor isnt that expensive.

I suggest you buy and A/F gauge, and also when you wire the SAFC use the blue wire on the SAFC and tap it into the O2 signal wire on the ECU. This will give you a voltage reading of the O2 sensor, it might be more accurate than the gauge when tuning.

 

since I'm gonna replace it anyway, would it be worth it to go with this kit? https://www.rx7club.com/forum/showth...threadid=47104

I've been reading alot about that, but I'm not sure if I can use it with my stock ECU and no Tuning Devices.