pcm speedo pulse count calibration

[BOGSTOCK]

Can anyone please help?
VS v6 auto conversion, I want to calibrate speedo using the pcm original speedo output only. ATM we use the output with a ratio box from jaycar but need 2 to get the speedo accurate as one doesn't change pulses enough on its own.
I have modified the "road speed sensor constant pulses per/km" and gone to the extreme from 1016p/km to 56,000p/km and no change in speedo accuracy.
Am I modifying the correct parameter or is there something else? What does vss ratio-speed constant for automatic transmission change? hoping someone has done this and can point me in the right direction.
Thanks

[immortality]

Going to assume standard 4l60e transmission? What diff ratio? What was your previous transmission? Did you use a standard V6 Automatic wiring loom?

Using a standard V6 tune with the factory PPK value should see the correct speed unless you have altered the diff ratio.

[BOGSTOCK]

4.33 diff ratio, std t700 but dash cluster isn't holden it's Toyota. I can get speedo correct using ratio box's but don't want this. Was assuming there is a pulse output I can change to suit. Running off pcm speedo output C5 violet with white trace. like I said it works with ratio box's but that's big and bulky and hard to find a nice hiding place. I would have thought pulse per km was the correct parameter to modify for diff ratio changes etc. I'll try output ratio as well see how it goes I guess.

[vs ss]

The ppk etc in the pcm will only change what the pcm sees.
It will not change output to dash, you will need correction box for this.

[BOGSTOCK]

ok so I should change the ppk for the 4.33 ratio I have now anyway as that will upset all shift points and shift early? What pulse count should I see for 4.33 ratio and 245/40/18, or how can I work it out? Kinda sux there is no output ppk adjustment. Thanks for the help so far.

[BOGSTOCK]

and will I need to change ppk or just vss ratio?

[vs ss]

Had a quick look as on my way out but by doing some quick math in my head it should be around 2400 in the ppk setting.

[BOGSTOCK]

thanks, ill run that and just go the cal box