Speedometer parameters

[billiardcue]

My car is an 04 Vette, it was tuned using LS1 edit when I installed a 3.42 gear and torque converter also changed the tire diameter to 26.1 at that time.
Downloaded the tune into EFILive and now the speedo parameters seem out of whack. It reads the current tire diameter as 25.23.
I made an 1/8 mile pass and the timer said I went 88 mph, add a couple of mph for the distance traveled to the finish line from the first mph beam I would assume the car attained 90 or 91 mph. The scan log from the run said I attained a max mph of 86.
What are the correct parameters for my application?
How do I correct this?

[Blacky]

There is a known issue with the speedo calculator in the current release of EFILive. The problem has been fixed and a new version of EFILive will be released soon.

These are the settings to use for a 26.1 inch tire and 3.42 gear:

PPM = 30909
Vehicle speed ratio: 2642.72
VSS pulses per revolution: 11.6959

Regards
Paul

[02 pewter Ls1]

There is a known issue with the speedo calculator in the current release of EFILive. The problem has been fixed and a new version of EFILive will be released soon.

These are the settings to use for a 26.1 inch tire and 3.42 gear:

PPM = 30909
Vehicle speed ratio: 2642.72
VSS pulses per revolution: 11.6959

Regards
Paul

What settings do I use to go from a 273 gear to a 342 gear in my new Moser rear? I tried the settings above and the speedo is all out of wack. When will the 1.9 be ready for download?

[Blacky]

There is a known issue with the speedo calculator in the current release of EFILive. The problem has been fixed and a new version of EFILive will be released soon.

These are the settings to use for a 26.1 inch tire and 3.42 gear:

PPM = 30909
Vehicle speed ratio: 2642.72
VSS pulses per revolution: 11.6959

Regards
Paul

What settings do I use to go from a 273 gear to a 342 gear in my new Moser rear? I tried the settings above and the speedo is all out of wack. When will the 1.9 be ready for download?

Those settings were for a C5.
What is your tire diameter?
Is it an auto or a manual?
We hope to have the "pre-release" V7.1.9 available sometime in the next week.

Paul

[02pewterls1]

There is a known issue with the speedo calculator in the current release of EFILive. The problem has been fixed and a new version of EFILive will be released soon.

These are the settings to use for a 26.1 inch tire and 3.42 gear:

PPM = 30909
Vehicle speed ratio: 2642.72
VSS pulses per revolution: 11.6959

Regards
Paul

What settings do I use to go from a 273 gear to a 342 gear in my new Moser rear? I tried the settings above and the speedo is all out of wack. When will the 1.9 be ready for download?

Those settings were for a C5.
What is your tire diameter?
Is it an auto or a manual?
We hope to have the "pre-release" V7.1.9 available sometime in the next week.

Paul

Tire size is 315\35\17
Automatic tranny
2002 f-body

[Blacky]

Tire size is 315\35\17
Automatic tranny
2002 f-body

Assuming a tire diameter of 25.68 inches:

PPM = 107438
VSS pulses per rev = 40
TOS revs/mile = 2686 (aka vehicle speed ratio)
Diff ratio = 3.42

Adjust shift speeds by -20.17%

Regards
Paul

[02pewterls1]

Tire size is 315\35\17
Automatic tranny
2002 f-body

Assuming a tire diameter of 25.68 inches:

PPM = 107438
VSS pulses per rev = 40
TOS revs/mile = 2686 (aka vehicle speed ratio)
Diff ratio = 3.42

Adjust shift speeds by -20.17%

Regards
Paul

Thanks for the quick response Paul. :D
Great product and customer service.

[02pewterls1]

Paul I need to know what settings to use for a

1999 F-body
Manual Tranny
410 Gears
275\40\17 Tires

Thanks again :D

Lou

[Blacky]

Paul I need to know what settings to use for a

1999 F-body
Manual Tranny
410 Gears
275\40\17 Tires

Thanks again :D

Lou



Vehicle Speed Sensor Pulses per Mile 54782.446332 Pulses/Mile
Vehicle Speed Sensor Pulses per Revolution 17.000000 Pulses/Rev
Differential ratio 4.100000 Factor
Vehicle Speed Sensor Ratio 938.163448 Revs/Mile