Help for speedometer correction after gear change without tune

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Oct 18, 2022 | 03:11 PM

#81

05stangkc

Administrator clevparts@aol.com

Joined: November 27, 2004

Posts: 12,563

Likes: 4,314

From: Visalia Ca.

Quote:

Originally Posted by m05fastbackGT

At 65MPH in 5th gear with stock 3:55 gears...My speedo hovers between 2000-2200 RPM with 26.7" diameter 275/40/18" Firestone Firehawk Indy 500 tires on 2007-09 Shelby GT500 18x9.5" wheels on all 4 corners.

You Have a .68 Overdrive and The Chart Puts You Right at 2000 Rpm at 65. I'm good With that!

Thanks Rocky!

KC

Oct 18, 2022 | 03:14 PM

#82

m05fastbackGT

SUPERCHARGED RED ROCKET ------------------Master-Moderator

Joined: May 11, 2006

Posts: 10,645

Likes: 2,511

From: Carnegie, PA

Quote:

Originally Posted by 05stangkc

You Have a .68 Overdrive and The Chart Puts You Right at 2000 Rpm at 65. I'm good With that!

Thanks Rocky!

KC

At your service Kevin!

Oct 18, 2022 | 04:41 PM

#83

Siber Express

Legacy TMS Member

Joined: May 19, 2010

Posts: 1,927

Likes: 567

From: Clinton TN

I am like 79 MPH at 2000 in my F150 with 32 inch tires and 3.55's but I still only get 16 on the highway with a tailwind

Oct 18, 2022 | 08:54 PM

#84

m05fastbackGT

SUPERCHARGED RED ROCKET ------------------Master-Moderator

Joined: May 11, 2006

Posts: 10,645

Likes: 2,511

From: Carnegie, PA

With running 32 inch tires, 3:55 gear ratio and Boss 6.2... 16 MPG highway is actually pretty decent IMO

Dec 19, 2022 | 03:08 PM

#85

05stangkc

Administrator clevparts@aol.com

Joined: November 27, 2004

Posts: 12,563

Likes: 4,314

From: Visalia Ca.

@CharlieH

Did This Mystery Ever Get Solved!

Inquiring Minds Want to Know.

Can I Get Some Likes on That????

KC

Dec 19, 2022 | 03:52 PM

#86

Bert

Legacy TMS Member

Joined: January 25, 2010

Posts: 3,971

Likes: 1,663

From: Massachusetts

obliged

Dec 19, 2022 | 04:56 PM

#87

GRUDD61

Member

Joined: March 24, 2012

Posts: 9

Likes: 0

From: bloomington

I use Forscan and a vLinker FS adapter that connects to obd2 port. They recommend another one also (OBDlink EX) but it cannot talk on 18V pin 13 which is required for changing those types of settings (axle ratio, tire sizes,,etc...) I have been using vLinker FS to update many modules with Ford's current calibrations, since I had not updated any firmwares since buying the car in 2012. For example, the IPC module has an update that fixes the "can't reset oil life" after 60k on odometer issue.

Take several days and read thru forscan forum. They basically help u thru each step.

Dec 20, 2022 | 06:23 AM

#88

Bert

Legacy TMS Member

Joined: January 25, 2010

Posts: 3,971

Likes: 1,663

From: Massachusetts

Quote:

Originally Posted by GRUDD61

...Take several days and read thru forscan forum. They basically help u thru each step.

I think that is the problem: most people do not have several days to figure out forscan; so they are looking for a quicker and easier way to do some simple things.