Diff ratio change VN/VP PPK adjustment

[immortality]

Hey All,

I know in the past with diff ratio changes most folks recommend fitting a Jaycar speedo corrector kit (as I have done previously), however would it be just as easy to simply adjust the PPK value in the tune? I can't see it causing any other issues as there are no transmission settings that would be effected like the later model Commodores with the electronic transmissions.

[vs ss]

ppk settings wont change the speedo, as the vn/vp speedo receives the signal before the ecm.

[immortality]

Damn, that's right. Forgot about that on the earlier model Commodores

Cheers

[The1]

earlier ones jaycar box, vt and up change ppk in cluster with tech2

[vs ss]

Yes that's spot on the1 everyone seems to think that in the vt etc you can change the speedo via ppk but as you stated it has to be changed with tech 2 in the dash.

[delcowizzid]

or you can open the speedo and mod it with 1 variable resistor and make it infinately udjustable

[delcowizzid]

http://members.ozemail.com.au/~brettsue ... ometer.htm this is how i do it for conversions

[vs ss]

I know in the vn/vp speedo (not level 3)there was an adjustable trimpot that I used to adjust but I don't know if it changed the odo or not.
Toooo long ago

[VX L67 Getrag]

Nice Work Delcowizz, I have thought about it a few times but never bothered looking into it, but that is simple nice & covers both areas!

[Dylan]

I know that with the T5 manual trans you can change the Speedo gear inside the box.