Speedometer Calibration

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Feb 5, 2013 | 06:44 PM

#21

rriddle3

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Bullitt Member

Joined: January 24, 2013

Posts: 291

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Quote:

Originally Posted by stupidgenius36

...I just noticed that you're local...I'm curious which dealerships you took it to?

Started with Bankston Ford of South Fort Worth on Loop 820 - completely disregarded anything I said and pretty condescending.
Second was the selling dealer, Don Davis Ford in Arlington. Good effort, but quit when Ford said that GPS wasn't accurate enough.
Finally went to Bankston Ford on Bryant Irvin Rd and they listened to me and followed through.

Feb 6, 2013 | 09:23 AM

#22

FordService

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Joined: October 25, 2010

Posts: 5,279

Likes: 16

From: Dearborn, MI

Quote:

Originally Posted by rriddle3

UPDATE:
Took it to another dealer. They verified the rear axle gear ratio, the tire and wheel size, and contacted Ford engineering hotline who told them to reflash the PCM. The tune was stock, but somehow things got corrupted, causing the speedo error. Got it back and checked it with GPS and at 60mph on the gauge it reads dead-nuts-on. Everything was done under warranty. Yea!

And, Deysha, thanks for the connections. Jason with FoMoCo talked with the dealership and then with me today. I'll let him know tomorrow that things got sorted out.

Awesome! Thank you for the update and you're very welcome!

Deysha

May 3, 2014 | 11:17 AM

#23

Chefgunner

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Joined: May 3, 2014

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Same Issues with Speedometer

I am having the same issues exactly with my 14 GT. But I have the 3.73 gears. Same Pirelli Tires. No problems until I got tuned.
Any Ideas?

May 3, 2014 | 02:23 PM

#24

Joeywhat

Cobra R Member

Joined: February 6, 2014

Posts: 1,564

Likes: 41

From: Motor City

Quote:

Originally Posted by Chefgunner

I am having the same issues exactly with my 14 GT. But I have the 3.73 gears. Same Pirelli Tires. No problems until I got tuned.
Any Ideas?

Well if it didn't happen until you tuned it...it's probably the tune.

May 3, 2014 | 02:24 PM

#25

rriddle3

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Joined: January 24, 2013

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Quote:

Originally Posted by Chefgunner

...No problems until I got tuned...

That's probably the key right there. The value for the rear axle ratio was most likely not entered correctly. Reinstall the tune with your handheld and check the speedo. If it's still not right, there should be an option in the tune installation process to select the gear ratio - try that. If no luck then, I would contact whoever wrote the tune.