I see all thies posts about "im running rich" "im running lean"

How do you guys fix this? Sorry if it's a dumb questions, but how would you fix your mixture?

Also, would a fuel controller (APEX-I S-AFC) give any help with our cars. I used to be a honda guy and the fuel controllers were a must with a modded car....

Thanks,
Chris.

 

That's what I was wondering. I was thinking about the Apex myself.

 

an S-AFC is a band-aid solution. The real solution is an updated air/fuel curve in the ECU, which is only possible by a TechnoSquare reflash or by installing an aftermarket ECU. Personally, I dislike the TS reflash as well, because it's a one-shot deal by a company way out in CA, which means I can't tune it myself on my own car. I really want an aftermarket ECU, but there aren't any good solutions at the moment. I'm praying that Apex'i will release a Power FC application, or AEM will release an EMS application. Neither company has announced anything yet.

 

Keep an Eye out for the XEDE from Vishnutuning.com....From what I read it seems to be a piggyback ECU that will adjust timing and A/F without the ECU knowing it..It looks like it has been sucessful on the WRX's and has different downloadable programs for it..And I think you can tune it youself..

 

I wouldn't call the an AFC controller a band-aid solution. As we have cars running well over 800hp with these solutions. The ecu flash is a great way to aid the proper controll of you af, but is best done with the car on the dyno. Alot of times the af controller is all you need to get to the proper afc, sometimes a combination of ecu flash and afc is needed depending on injectors used, etc.
Before using buying afc I would recommend getting a wideband device to measure where you lean / rich. Or tuning with the afc on a dyno so you can see you're af curve through the rpm range.

 

there is no doubt that an AFC can be used to correct A/F ratios, even on high-powered cars.. but I still maintain that a full ECU is the more appropriate way of handling things. The full ECU uses feedback, such as airflow, throttle, RPM, etc to maintain an appropriate A/F ratio. The AFC usually just uses an RPM/adjustment table, which I consider to be a "band-aid" solution. The mere fact that an AFC adjusts MAF readings to fool the ECU into altering A/F is the first sign that an S-AFC isn't the best way to tune a car. Anytime you're "fooling" the ECU into operating a different way, you should revisit your tuning approach and make sure you're really solving the problem instead of just hacking together a solution that works.

The S-AFC doesn't account for humidity, oxygenated fuel, boost, etc, etc. Anytime these parameters change, your A/F ratio should change too.. but that won't happen with a system tuned with an S-AFC.

 

I understand that there are "Better" ways to tune a car...but I was just curious why I havent seen one on a Z...Well I will be one of the first...I am going to purchace one pretty soon here. I used to have a 2001 Prelude that I fully built turbo with internals, and I went with the AEM Standalone, but that was because of the needs of pushing 400hp from a H22 4cyl. I did love it though, you could hook up a wideband to the computer and set a fuel ratio and it would adjust accodingly.....crazy stuff.

Chris.

 

I'm having the Apexi Safc installed and dyno-tuned on my Z before xmas and will be sharing my results. As for it being a "band-aid solution", all I can say is that every Z runs a little differently; a maf calibrated to you particular car sounds like a good idea to me.

...and someone has installed an Apexi:
https://my350z.com/forum/showthread....highlight=safc

 

the afc doesn't update the a/f curve????
this is news to me... can someone confirm or explain this statement to me?

 

It does update the Fuel Curve, but it doesnt change the fuel curve in the ecu. It takes what the ECU puts out and modifys it slightly. Some people think that it's just tricking the car and not actually fixing any problems. But the way I see it.....If the fuel curve it changed- I dont care how it's done ;-)

Chris

 

"It takes what the ECU puts out and modifys it slightly. "

I think this statement is incorrect; the Safc intercepts the maf's signal, modifies it and than passes it on to the ecu.

 

My mistake- I always thought it modified the output signal...not the input.

Chris.

 

I think the SAFC will be beneficial down the road. For those members that already have full bolt-ons it would be a great choice. IMO, the only beneficial thing added by a TS ECU flash is the raised rev limit. The SAFC II actually has 2 different programs available, someone could have their car tuned in Summer and winter and then switch between the two settings.