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Old 01-09-2013, 10:51 AM   #1
spiderpig
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Some Basic Info

So I got a wifi ODB2 connector and I bought DashCommand app for my IOS devices. In the advanced section for my car it asks for questions that I don't know. So I'd like to ask for you help in finding out details about my Ford Focus 2013 Titanium model with 17" polished wheels.

Here's the info I need:
Tire Size Specification: Enter as width/profile/diameter(in) (like 215/45/R18)
Final Drive Ratios: Enter a ratio for each forward gear starting at gear 1 and seprate them with a semicolon.
Wheel Circumfrance: overall circumfrance in inches
Drag Coefficient
Frontal Area (in ft2)
Maximum Engine Speed
Minimum engine speed
Shift Point(in rpm)
Tire resistance
Speed Correction
(I'm assuming I would have to figure it out somehow).

Any help to get these info would be great. I'm not a car guy but I'm a IT geek and love collecting data on my car.


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Old 01-09-2013, 04:08 PM   #2
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http://media.ford.com/images/10031/2013_Focus_Specs.pdf

That should give you most of it, probably.
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Old 01-09-2013, 05:48 PM   #3
spiderpig
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Looks like that has the final drive rations....will have to try to find the other data.
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Old 01-09-2013, 07:17 PM   #4
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Quote:
Originally Posted by spiderpig View Post
So I got a wifi ODB2 connector and I bought DashCommand app for my IOS devices. In the advanced section for my car it asks for questions that I don't know. So I'd like to ask for you help in finding out details about my Ford Focus 2013 Titanium model with 17" polished wheels.

Here's the info I need:
Tire Size Specification: Enter as width/profile/diameter(in) (like 215/45/R18)
Final Drive Ratios: Enter a ratio for each forward gear starting at gear 1 and seprate them with a semicolon.
Wheel Circumfrance: overall circumfrance in inches
Drag Coefficient
Frontal Area (in ft2)
Maximum Engine Speed
Minimum engine speed
Shift Point(in rpm)
Tire resistance
Speed Correction
(I'm assuming I would have to figure it out somehow).

Any help to get these info would be great. I'm not a car guy but I'm a IT geek and love collecting data on my car.
The tire size is printed right on the outside of the tire, its a 215/50/r17
Over all wheel diameter 25.5" with the 17" wheels.

Drag coefficient depends on if its a sedan or not. The sedan is at a 0.297 without the active grille shutters (with them on and fully closed it lowers to closer to 0.27 CDA afaik, the hatch is a little bit higher by a few clicks. I'd estimate it at nearer to 0.31 or so but it might be literally 0.299 or 0.300 vs 0.297 with the sedan.

Frontal area is usually calculated as 80% of the height and width of the front of the car.

Height empty is 57.7" (4.81 ft) for the sedan and hatchback.

The width with mirrors is 80.5" (6.71 ft) for the sedan and hatchback (i.e. they have the same frontal silhouette)

Frontal area is therefore approximately (0.8)(4.81*6.71) =25.82 ft^2.

Maximum engine speed is the redline which is typically 6500 rpm (sometimes it might go a little faster). Minimum is the target idle speed of 680 rpm.

Quote:
Optional PowerShift six-speed automatic
1st 3.917
2nd 2.429
3rd 1.436
4th 1.021
5th 0.867
6th 0.702
Reverse 3.507
Final drive 3.850 for gears 1, 2, 5 and 6; 4.278 for gears 3, 4 and R
Ergo actual gear ratios are the gear ratio* the effective final drive for that gear.

1st = 3.917*3.850 =15.082:1
2nd = 2.429*3.850 = 9.35:
3rd = 1.436*4.278 = 6.14:1
4th = 1.021*4.278 = 4.37:1
5th = 0.867*3.850 = 3.34:1
6th = 0.702*3.850 = 2.7027:1
Rev= 3.507*4.278 = 15.003:1

Shift point is way too variable to feed into the calculation.

Standard rolling resistance coefficient is about 0.010 for normal tires, low rolling resistance tires might be 0.008 or so. I don't have the figures for either the 17" continentals or the 18" Michelins.
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Old 01-10-2013, 07:00 PM   #5
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Thanks for the all the details! I have the sedan version so I'll input that data.

Also, found that it's asking for volumetric efficiency. It says the value between 60 and 85 is a good starting point. Any ideas?
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Old 01-10-2013, 07:23 PM   #6
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Quote:
Originally Posted by spiderpig View Post
Thanks for the all the details! I have the sedan version so I'll input that data.

Also, found that it's asking for volumetric efficiency. It says the value between 60 and 85 is a good starting point. Any ideas?
http://www.installuniversity.com/ins...n_9.012000.htm

Example calculations. You would need to log data first though.
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