calio64

just installed a s-afc and apexi turbo timer that has o2 sensor voltage reading and a a/f reading on it...im trying to adjust the s-afc so its perfect..this ecu i got from r-magic in japan was on a race car so its gives my car to much fuel so it runs rich (i think)...so i have this s-afc to tune the gas down a little and i would like to know what the best 02 voltage is on these rx7's to go by...were is the reading at perfect so i know when its starting to get rich or lean?and if somebody can give me website or tell me were i wanna run rich and werei wanna run lean that would be awesome

thanx for any help

1987RX7guy

iTrader: (3)

Don't attempt tunning basing yourself on the stock narrow band O2 sensor. Go to a dyno shop with a wideband and tune it there.

Evil Aviator

I agree with the advice to go to a professional shop for tuning, but I disagree with the reasoning. The narrow band O2 sensor will work just fine for tuning, as will no O2 sensor at all. The key here is to have a good tuner working on the car. No offense, but if you are asking questions like this, then you need to take the car to somebody else. I often take my car to professionals for advanced work, not because I am stupid, but because I am smart (at least in this respect, lol).

Number of car engines blown up by Evil Aviator in 19 years = 0

Nowhere

There's a dyno shop (NO personal experience!) on Highway 17/92 in longwood, look in the phone book for transco transmissions, It's right next door to them. If you know where 17/92 and 434 intersect, it's about 1 ~ 1.5 miles north on your right (if you're heading towards lake mary).

Give'em a ring, see if they have any rotary experience. Lemme know, I want to get mine tuned also

Nowhere

Or here's what I found on the yellowpages.com

DYNO TUNING BY VINCI HI PERFORMANCE
3915 EL REY RD, ORLANDO, FL 32808
Phone: (407) 292-4500

arch8300

Do you guys know if there is a rotary shop in the area?? I am in lake mary.

calio64

thanx for the info ill call these people and ask if they can help us out

calio64

theres this great shop on obt in orlando named fuego racing they are fc specialist...they are cool guys there # is 4074381568 ask for jose...

and that dyno shop on 17/92 does not to rotary cars..the guys at fuego racing refered me to a shop in apopka named lugo performance there # is4075221505

Scott 89t2

you don't need a rotary guy to tune a S-afc.
you'd only want a rotary guy if you were playing with the timming.

as long as the shop knows how to use buttons on the S-afc. just tell them you want it at 11.9:1. it's easy.

calio64

11.9? would that be the a/f ratio? is that what i wanna set it at on my gauge with the s-afc?i have a decent a/f ratio digital meter on my apexi turbo timer and now it reads 12.5 -14.0 is this to rich?

thanx for the advice

calio64

my gas mileage is horrible right now

Scott 89t2

it's air flow ratio. the lower the richer. at 14:1 at full throttle you'd pop your engine in a sec.... way to lean

either that reading is at crusing or your 02 sensor and gauge are usless which most are. which is why everyone says to go to a dyno and use a wide band one.

Evil Aviator

You really need to take your car to a professional tuner. At least the tuner will have insurance, and is able to compensate you if he blows up your engine. I cannot say the same for the comments on internet forums.