I'm going to take my 00 GT out and do some data logging on the Predator. My question is what is the proper a/f ratio I am supposed to have? Also, since I turned the tc off my ABS light comes on all the time. Anyone else have this problem? My steering wheel does shake quite a bit when I brake. What would cause this and does it have anything to do with my ABS light?
proper a/f ratio
- Thread starter Nice1Ford
- Start date
Crzyhrse
Active Member
What would be considered the normal area for a N/A Mustang would be 12.8-13.2. Being still alittle outside these boundaries is still ok though.
jstreet0204
Active Member
depends on how you are driving. under normal driving conditions and idle it should be around 14.7:1 under wot the stock tune should go to about 12:1 if it was modifed, around 13:1
SamMan
New Member
Steering wheel shaking during braking could be a warped rotor. My a/f N/A stayed right around 13.1.
hognutz
New Member
well a/f ratio at cruise should be 14.7 to 1. now at WOT it depends on tune. n/a it should bei somewhere between 12-13.
I disabled my traction control and my abs light is not on.
stearing wheel shaking wile applying the brakes could be a sign that you need a brake job or a rotor is warped. I would suggest just doing a brake job. you will either have to have your rotors turned or buy new ones so you will find the problem.
I disabled my traction control and my abs light is not on.
stearing wheel shaking wile applying the brakes could be a sign that you need a brake job or a rotor is warped. I would suggest just doing a brake job. you will either have to have your rotors turned or buy new ones so you will find the problem.
propellerhead
New Member
BlackenedSVT
Active Member
Nice1Ford said:
Shaking steering wheel while braking usually indicates warped rotors. I'd hav them taken off and inspected with a micrometer or cut. Perhaps your pads are very low as well and/or master cylinder fluid is low. If that happens the ABS will de-activate itself. I'd look into checking your brakes.
And i believe most people on here run a little rich, at around 13.1:1 Air/Fuel Ratio, which many on here call "lean"
jstreet0204
Active Member
propellerhead said:The Predator shows you a/f ratio?
If you don't have a wideband, you can calculate closed loop a/f relatively accurately by logging the fuel trims.
propellerhead
New Member
I thought the fuel trims were meaningless at open loop. Where did it say that?jstreet0204 said:
1LowGT
New Member
propellerhead
New Member
jstreet0204
Active Member
propellerhead said:
Sorry, that was a typo I meant to say closed loop fuel trims. I'll go back and edit that post.
To calulate you have to log LAMBSE (EEC's tageted a/f ratio) and KAMRF (fuel trims)
Multiply the two to get your actual a/f ratio. This only works within the range that the o2's are accurate, about 14:1 to 15:1 but I've seen many people tun maf curves and injector slopes without a wideband using only these tow parameters.
propellerhead
New Member
Got'cha.
The Predator only lets you tweak WOT (open loop) fuel ratio. I hope you're not trying to adjust WOT fuel based on non-WOT estimates.
The Predator only lets you tweak WOT (open loop) fuel ratio. I hope you're not trying to adjust WOT fuel based on non-WOT estimates.
jstreet0204
Active Member
propellerhead said:
I don't have a predator I use a Tweecer and a wideband for tuning. I was just showing how you could get some sort of idea of your a/f to see how far off your MAF curve is.
propellerhead
New Member
Ok. You have more capabilities with your Tweecer than Nice1Ford does with a Predator. I hope Nice1Ford doesn't try to adjust his WOT fuel based on non-WOT fuel trims.jstreet0204 said:
