[low c1500]

Originally Posted by lawdog2k

I have been corresponding with JAck debating on getting the Flux or not...mainly for speedo calibration...well, this is from Jack in an e-mail "The tire size can be changed within the Flux software – but no adjustments are crossed over to your dash."

So, the speedo display will not be fixed, even with flux. "Tire correction is only done in Flux – there would be no reason to do so on the basic unit. Tire size correction is only for display use, and does not affect any performance numbers."

The flux is basically a data recorder and display, "The programming of the Tire Size correction will only be valid once you pare your Unichip, Vehicle, and Flux adapter. To be specific, the Unichip nor Flux Power Display Software does not alter the speedo on any vehicle. However, what the Flux software allows the user to do is show visually on their PDA a corrected speedo value. As for the ability to tune, there are no features within the software to allow for end-user tuning. The Flux Power Display Software is designed for capturing performance data – RPM, speed, lap times, etc. "

I chose to go without FLux because I was just wanting it to adjust my speedo...not too concerned with seeing and recording rpm, speed, and the like.Just throwing out what I was told and my decision. I have GPS in my radio anyway if I wanna know my actual speed, acceleration g's, lateral g's, and skid.

This would only make sense, becasue (if the 2007+ Tundra's are like the 2006's) the speedo signal comes out of the ABS unit, then into the dash, then from the dash it goes into the ECM.

So a piggy back ECM unit couldn't be used to correct dash readings.