Fiesta ST Map switching mods base tune

[razorlab]

OK I may be confused then I will wait till you present more info. But you will still need to mix a E30 or E40 in the tank and the meter will tell you which tune to run (or switch it if that at somepoint happens) Or am I off base on this ?

Yes, for now you will still need to mix based on something like the chart below. However after mixing you will know EXACTLY the % in the tank because the gauge and sensor will tell you.

 

[rodmoe]

Yes, for now you will still need to mix based on something like the chart below. However after mixing you will know EXACTLY the % in the tank because the gauge and sensor will tell you.

Ok I am on the right page then and yes I still have the chart and a couple of handy online apps that work on my Phone http://www.intercepteft.com/calc.html

Oh one thing I noticed about the Chart it is for 10% Egas I can use Pure 91 and get a lil bump on my Oct. not that is matter but it will affect the mix if doing a full tank..

 

[razorlab]

Ok I am on the right page then and yes I still have the chart and a couple of handy online apps that work on my Phone http://www.intercepteft.com/calc.html

If I can get COBB on board then the ECU will switch automatically to the map that matches the ethanol percentage in your tank.

 

[rodmoe]

If I can get COBB on board then the ECU will switch automatically to the map that matches the ethanol percentage in your tank.

That will be sweet indeed

 

[Sourskittle]

That would be awesome.
Tire circumference.... Yea.... I know all that.... You guys all know your tire circumference, right? Lol

 

[razorlab]

That would be awesome.
Tire circumference.... Yea.... I know all that.... You guys all know your tire circumference, right? Lol

Just look it up on the tire manufacturer site.

 

[Sourskittle]

It has that? Lol.
I've never heard of that, but... I'm not a wheel/tire guy either.

 

[Sourskittle]

Map switching mods base tune

874 revolutions per mile. Does that help? Lol
http://m.tirerack.com/tires/specification.jsp

1.1" taller than stock
7.6" wide vs 8.4" wide

Geezzz... Now I realize why they seemed so big. 2lbs heavier than stock.

 

[razorlab]

You can figure out the approx circumference from the overall diameter that manufacturers publish on their site.

A tire with a 24.65 diameter would have a 77.44266415331448 circumference.

Divide diameter by 0.3183

 

[RAAMaudio]

To get a bit more detail measure thread depth as they wear.

Also the air pressure can make a pretty big difference and the width of the rim.

AND, tires specs are not always correct, sometimes purposely misleading when it comes to width but usually pretty close in diameter.

 

[Sourskittle]

So razor... What effect on the ecu does this tire setting stuff have ? I mean... Besides maybe a speed correction, what can it tell? Not sure what the point is... Having accurate info can't hurt, but what's it control?

 

[razorlab]

So razor... What effect on the ecu does this tire setting stuff have ? I mean... Besides maybe a speed correction, what can it tell? Not sure what the point is... Having accurate info can't hurt, but what's it control?

Not sure yet, I need to email Braden about it. I would imagine it has links to the speedometer, the ABS system, and maybe the torque vectoring system.

 

[Sourskittle]

Well... What ever it does

 

[iso100]

Not to mention that E85 is not always 85% ethanol. They vary it greatly based on climate. The only way to know for sure is to use a sensor.

 

[onederer]

Well... What ever it does

n00b .03937 is your friend ...or 25.4

 

[Sourskittle]

Seemed to of corrected my speedo

 

[RAAMaudio]

That is a great function, I was going to ask them about it but now already done, your speedo, odometer, mileage estimate, and just might make a difference in the areas Razor posted which could be fairly important.

Here is the best and easiest way to measure diameter.

Park on a level surface, measure from the ground to the center of the hub/center cap/etc.....double it, that is the best you are going to get.

BUT, it will be different on a hot day, cold day, hot canyon run, autocross, out on the track....so you could check them all and average it or even change it accordingly if going full tilt anal....

If will change less if you use dry air or even better nitrogen which is why it is used by many race teams to control tire temps better as higher temps can change the contact patch and sidewall stiffness significantly.

That is also one of the ways NASCAR guys can make those cars so darn fast, the measure every single tire and can change the stagger of the car with just a lb or two, or less, air pressure adjustment.

 

[razorlab]

The real time mileage on the dash is computed by injector fueling calculations, IPW, and a multiplier. You can also change that in ATR. I change it to make the dash MPG meter more accurate on Ethanol blends. Without it, the dash gauge is off.

 

[RAAMaudio]

I sure do not miss stand alone, piggy back, jetting, etc......so many ways to tune and now look what we get for cheap and all it can do.....and great people figuring it out and sharing it

Even if you pay for a custom tune it does not cost that much.

 

[COBB Tuning1]

One thing I just found last night is that ATR now has the tables for tire settings that the ECU uses for checks. I'm wondering if that is also tied into the vectoring. I'm going to ask Braden about it.

Not that I've seen thus far. This will help bring anything like cruise control and per wheel speeds back in line but will not effect the odometer or speedometer. The signal for those comes from the ABS module, at the moment.

Cheers,
Braden @ COBB