Crappy ford tune

[bhuff30]

I've got a 97GT, bone stock except for an off road H-pipe. After reading an article online from MM&FF, I was curious about the air fuel ratios on my 97. On their stock 96, the air fuel ratios were around 13.5:1 in the mid range, dropping to 12:1 at higher rpms.

I put the wideband on the 97, and it is not pretty! It is actaully around 13.8:1 in the mid range, dropping to 12:1 between about 4000 and 5500. That is scary lean in my opinion.

Why in the world would ford make it so lean in the low and mid range? Clearly, there is a lot or torque to be gained making the mid range richer and the top end a little leaner.

So what is the cheapest way to modify the fuel tables myself? (ie, which tuner).

 

[281CI96Coupe]

I am very interested as well, I hope some modular guru's chime in. I think I can answer part of your thread. During 96....Emissions got really big hence the midpipe, so maybe thats why they put that tune on the car. I think 96-98 has the most restrictive crap on the car.

 

[blkhorse]

being n/a,I see no problem.actually the leaner you can run without detonation will produce the most power

 

[DBMSTNG]

I've got a 97GT, bone stock except for an off road H-pipe. After reading an article online from MM&FF, I was curious about the air fuel ratios on my 97. On their stock 96, the air fuel ratios were around 13.5:1 in the mid range, dropping to 12:1 at higher rpms.

I put the wideband on the 97, and it is not pretty! It is actaully around 13.8:1 in the mid range, dropping to 12:1 between about 4000 and 5500. That is scary lean in my opinion.

Why in the world would ford make it so lean in the low and mid range? Clearly, there is a lot or torque to be gained making the mid range richer and the top end a little leaner.

So what is the cheapest way to modify the fuel tables myself? (ie, which tuner).

looks fine to me. supercharged cars typically run 12.5:1 below 4000rpm and N/A cars typically run 1 point higher a/f ratio than blown.

 

[bhuff30]

Most of you say it looks fine, but MM&FF picked up 12ft*lbs by making the mid-range richer. I'd rather see 12.9-13.2ish on an NA engine.

 

[DBMSTNG]

Most of you say it looks fine, but MM&FF picked up 12ft*lbs by making the mid-range richer. I'd rather see 12.9-13.2ish on an NA engine.

A.) take anything in MM&FF with a grain of salt.

B.) Ford has to tune for emissions and gas mileage as well as power. so power will not be the max possible straight from the factory.

 

[BurningRubber]

After I dyno'd my car with all the mods in my sig, my AF was around 13.8 leaning way out on the top end.

I added fuel and adjusted my spark advance, brought the AF down to around 13.4 or so and I gained 6.9 rwhp and 13 lb ft of tourqe.

I had been driving a while with an AF ratio like that, pretty scary.

 

[04GTMustang]

with my mods and the sniper tuner building the base tune my a/f was a perfect 13.0 across the board.