PKK Adjustment to suit final drive ratio change

Holden/Delco Tuning. ALDL, OBD 1.5. Circa 1989 to 2004.
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PKK Adjustment to suit final drive ratio change

Postby mikegmh » Mon Sep 18, 2017 11:33 am

Hi gents,

This is all fairly new to me so please be kind :thumbup:

I have changed diff ratio from 3.08 to 3.45 in a VN. Running NVRAM 12P.
I have had a play with the PPK figure to attempt at getting the speedo to read correctly however adjustments have no effect on the speedo reading. Standard figure is 6248.14.

Is there something i'm missing?

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Re: PKK Adjustment to suit final drive ratio change

Postby gtrboyy » Mon Sep 18, 2017 11:35 am

Fitting a variable resistor will do the trick or speedo corrector off festy in for sale section

Vn-p speedo is different to the later cars,wiring in centre dash near lighter/radio etc

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Re: PKK Adjustment to suit final drive ratio change

Postby Dylan » Mon Sep 18, 2017 12:04 pm

In VN the speed signal goes to the cluster then to the ECU through a divide by 10 circuit. Maybe you could wire it the other way like the later model's?

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Re: PKK Adjustment to suit final drive ratio change

Postby antus » Mon Sep 18, 2017 1:14 pm

Also search for "Q. How do I recalibrate a VN speedo? " in the FAQ area (see link near top right). There are details of the method gtrboyy mentioned there.
Have you read the FAQ? For lots of information and links to significant threads see here: viewtopic.php?f=7&t=1396


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Re: PKK Adjustment to suit final drive ratio change

Postby delcowizzid » Mon Sep 18, 2017 2:31 pm

I do the variable resistor in stock gauge in place of a solid value resistor works pretty good for most conversions
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Re: PKK Adjustment to suit final drive ratio change

Postby vlad01 » Mon Sep 18, 2017 2:46 pm

What value do you end up getting for the different ratios? I might have to do this too since I haven't been able to get onto festy for about a year now.

I got 3.23 ratio and the other car will eventually get 3.45. So am I right to have calculated somewhere around 36-37K for these ratios?
I'm the director of VSH (Vlad's Spec Holden), because HSV were doing it ass about.

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Re: PKK Adjustment to suit final drive ratio change

Postby delcowizzid » Mon Sep 18, 2017 2:55 pm

Value unknown just tweak it till it matches GPS speed lol
If Its Got Gas Or Ass Count Me In.if it cant be fixed with a hammer you have an electrical problem

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Re: PKK Adjustment to suit final drive ratio change

Postby vlad01 » Mon Sep 18, 2017 3:02 pm

fair enough.

Something like this I think should be right. 50K range.

http://au.rs-online.com/web/p/trimmer-r ... s/5220007/
I'm the director of VSH (Vlad's Spec Holden), because HSV were doing it ass about.

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Re: PKK Adjustment to suit final drive ratio change

Postby delcowizzid » Mon Sep 18, 2017 4:56 pm

Jayme saved the page off the way back machine download/file.php?id=10595
If Its Got Gas Or Ass Count Me In.if it cant be fixed with a hammer you have an electrical problem

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