07 CTS-V Speedometer off after gear change

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09-20-2013, 01:52 PM

#21

bulldog5.3

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Quote:

Originally Posted by NIKDSC5

Well I have approx 3,000 miles on my 3.55's and.....still off the speedo is. I guess I will keep waiting for it to correct itself. Good luck!

Anyone have hptuners in KC? There is one tuner in town. I hate KC when it comes to performance shops.

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09-20-2013, 02:03 PM

#22

69stangscj

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Quote:

Originally Posted by garrettg

Even the stock 07v running stock size tires reads incorrectly as it indicates on the dash a lower speed than the built in gps reads.

Where is the stock GPS for speed?

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09-20-2013, 03:31 PM

#23

punishmentcycle

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Quote:

Originally Posted by NIKDSC5

I know Im going back to 3.73's. I like the 3.55's, but....when I have enough power to top out 6th gear, then I will go back. They do not help enough on fuel mileage for me.

Yea I agree... They haven't done much except make me feel like I'm slower lol

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09-21-2013, 10:14 AM

#24

07CTS-V

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You have to change the number of vehicle speed sensor (VSS) pulses per mile to correct the speedo. It's a simple ratio of the 4.1/3.73x(49840). I think 49840 is the stock number. If not, substitute your stock number in for that.

It will NOT autocorrect, it will revert to a different calibration if it determines that speed sensor has failed. That calibration would theoretically make it read like it had stock gearing and tires.

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