does a A/F gauge serve any purpose if you have a SAFC?

 

a/f guage is old history, I dont know anyone who buys em anymore since people are using wideband kits. I know PLX kits has a box to convert the narrow band signal to wideband on Autometers a/f guages. Look into PLXdevices.com, I recomend the M-300,400,500 and 500r. Good for getting afc dialed in

 

To a degree they do. They will give you a basic reference, but they really arent much more than blinking lights. The best way to tune an SAFC is to do what PK said, invest in a wideband. That will give you near perfect numbers to tune by.

 

soory, im new. what a widband?

 

a wideband o2 sensor tells you the acutall a/f ration not just a rich lean light show from autometer

 

http://www.innovatemotorsports.com

 

<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by BLUE EH3 &raquo;</TD></TR><TR><TD CLASS="quote">soory, im new. what a widband?</TD></TR></TABLE>

so do you understand the concept of afr tuning? the perfect afr is 14.7(stoich) i believe, which with a narrowband o2 output, would be about .4 to .5 volts. when you tune with an autometer type gauge you are getting a really rough estimate on the afr. granted for tuning, you dont want a perfect afr (or stoich condition), you usually want to run a tad rich.

anyhow, what a wideband does is instead of taking a 0 - 1v reading, it takes a 0 to 5v reading, greatly expanding your scale and increasing your afr readout accuracy.

 

Wideband = better resolution

 

i will just get a safc

 

And adjust it how ? by the seat of your pants......
Its your car, good luck with the tuning the afc

 

ok??<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by PK SPEED &raquo;</TD></TR><TR><TD CLASS="quote"> And adjust it how ? by the seat of your pants......
Its your car, good luck with the tuning the afc</TD></TR></TABLE>

 

he's saying that a regular old afr gauge is not going to be an accurate enough tool to help you tune your car via an AFC. you will at the very least need some sort of device that allows you to see better how the engine is functioning at a certain rpm; hence the wideband o2 sensor and gauge set up. otherwise, a dyno is your friend.

better?

 

can i tune my AF with a safc.?

 

Thats what an SAFC is for, to tune your air/fuel ratio. You can make adjustments +/- 50%, and depending what model you have, at about 500 rpm increments.

 

you cant tune with a narrowband O2; unless your tunning for 14.7.

 

i actually successfully tuned my car once with the autometer guage hooked up to a new 02 sensor.

my buddies car had been tuned nicely (14.7:1 partial throttle, 12:1 WOT, boosted sohc, made nice power onthe dyno)

i watched his autometer gauge as he was driving around a bit. it bounced back and forth when it was partial throttle, and was a solid 3 or 4 bars into green at WOT.

so, my buddy got the chip burner out, and we went to town trying to make my car do that. burned chip after chip, and played with the adjustable fuel pressure regulator. i was tuning the car with turboedit, and was going to drive it from grand rapids michigan to niagara falls that night for the niagara crx meet, so it had to be better than it was, it was smoking black from rich-ness, and getting 12-15 MPG on the highway.

after about an hour, the car seemed to be running great, and wasnt smoking at all anymore.

got 30 mpg or more to niagara and all the way to jersey and back afterwards.

never detonated.

got it on a dyno a while later, w/ a Wideband 02, and it made GREAT power (185 whp and 155wtq at only 6.5 psi with a old *** d16a6, stock engine)

and the AF ratios were 14ish partial throttle, 12-11 ish WOT.

i couldnt believe it. sorry about the long post.

 

in closed loop, the car pretty much tunes itself to 15-14.4.
Im sorry to disagree, but at 12:1 AF the O2 sensor reads the same voltage as lets say 14:1 or 10:1

 

correct if i am wrong:

1- a/f gauge is used to montior AFR
2- safc is used to tune and montior AFR

Ps. what screen do u leave it on?


Modified by BLUE EH3 at 6:28 PM 4/13/2005

 

any one?

 

yes, but none of the APEX'i units have an AFR monitoring setting.

weird, huh?

 

<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by iakona &raquo;</TD></TR><TR><TD CLASS="quote">yes, but none of the APEX'i units have an AFR monitoring setting.

weird, huh?</TD></TR></TABLE> what do u mean?

 

<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by iakona &raquo;</TD></TR><TR><TD CLASS="quote">yes, but none of the APEX'i units have an AFR monitoring setting.

weird, huh?</TD></TR></TABLE>

you can do the blue wire trick to monitor the output voltage of your o2 sensor through the safc. search HT for it and you'll find a tutorial.

<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by BLUE EH3 &raquo;</TD></TR><TR><TD CLASS="quote">any one?</TD></TR></TABLE>

dude, all of your questions have been answered.

 

thank u