Speedo-Calculator ?

[GAMEOVER]

The last 3 trucks that I've worked on, the speedo-calculator has kicked my butt...
The speedo fine tuning doesn't apply the changes when I plug in the values into the Displayed speed and actual speed. It shows the corrected value needed but doesn't show the new VSS pulses per mile or Km.

When I measure the roll out of the tire(circumference) and put in the values, the speedo calculator is usually right but...When a combination of bigger/taller tires and lower gear ratio's are used it's hit or miss...:(

I can usually get to within +/- 2mph but the ABS and Brake lights always stay on...

[SUPERTRUCKER]

The last 3 trucks that I've worked on, the speedo-calculator has kicked my butt...
The speedo fine tuning doesn't apply the changes when I plug in the values into the Displayed speed and actual speed. It shows the corrected value needed but doesn't show the new VSS pulses per mile or Km.

When I measure the roll out of the tire(circumference) and put in the values, the speedo calculator is usually right but...When a combination of bigger/taller tires and lower gear ratio's are used it's hit or miss...:(

I can usually get to within +/- 2mph but the ABS and Brake lights stay on...

Are you using a GPS to get the actual speed to apply the corrected value?

[GAMEOVER]

Yes always....

[GAMEOVER]

Worked on a different truck today, 2008 Silverado 1500 4WD 5.3ltr (E38) 4L70E(T42) I tried to adjust for taller tire's & new gear ratio size....No Go!
35" tall tire & 4.88 rear gears....

[GAMEOVER]

Do I need to make changes to {H0122}?

EFI Live won't let me make changes to {H0101}
After It shows me the "Correction Value Required" I click on the apply button and nothing happens...I then try to add the correction manually to {H0101} but the software won't let me....

[GAMEOVER]

Anyone got any Ideas???????????

[Blacky]

The speedo calculator is not capable of calculating speedo setups for ALL GM vehicles. There are so many ways of setting up the speedo that it is virtually impossible to automate the process the same way across all PCMs. For non LS1/LS2 and Diesel vehicles I recommend not using the speedo calculator and just adjusting the speedo parameters* manually.

*i.e. manually figure out and change the tire size and gear ratios in both the ECM and TCM.

Regards
Paul

[GAMEOVER]

Paul,
Do you think I'm having problems because I've never changed the parameters in H0122?
I can figure out the tire size and where to adjust them but new gear ratio's and where to apply them(?????) is what's kicking my butt...

[GAMEOVER]

I feel really DUMB!!!
I just figured out the parameters in the TCM!!!
Thanks Paul, I'm glad you mentioned the TCM...Or else I would have never figured it out...

[Blacky]

Paul,
Do you think I'm having problems because I've never changed the parameters in H0122?
I can figure out the tire size and where to adjust them but new gear ratio's and where to apply them(?????) is what's kicking my butt...

Yes, H0122 is the diff ratio.
Paul