VX Cluster PPK

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VX Cluster PPK

Postby megajuz3003 » Fri Jan 19, 2018 11:15 am

i have just converted my VU SS from auto to manual, and kept the auto 3.07 diff and my speedo now won't read over 30kph :lol: after hours of scouring the net looking anything to help with working out the correct PPK i found this so i thought it would be a good idea to put it up here incase anyone else needs it, its meant for changing diff ratios but i figured i could work it for changing the box because the PPK is the same between them but they have different diff ratios

LS1 Auto 3.07 : 1
LS1 T56 3.46 : 1

CurrentPPK / OldDiffRatio = Lambda

Lambda * New DiffRatio = NewPPK

What i worked out for my car

6301 / 3.46 = 1821.0982685

1821.0982685 * 3.07 = 5590.77167
Last edited by megajuz3003 on Fri Jan 19, 2018 12:12 pm, edited 1 time in total.

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Re: VX Cluster PPK

Postby Gareth » Fri Jan 19, 2018 11:46 am

Thanks for posting :thumbup:
According to chemistry, alcohol is a solution...

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Re: VX Cluster PPK

Postby Wade » Thu Apr 19, 2018 1:57 pm

I just go though what ever tune has the same diff ratio and copy the changes over.

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Re: VX Cluster PPK

Postby vlad01 » Fri Apr 20, 2018 10:21 pm

Or you can if the same VSS and drive/drive gears are used as would if the box is the same but only the diff is changed.

For example.

Old diff = 3.08
New = 3.23

Old PPK for 3.08 = 1250


3.23/3.08 = 1.0487012987012987012987012987013

multiply result by old PPK

1.0487012987012987012987012987013 * 1250

New PPK = 1310.8766233..

Round off decimal 1310.9

For a laugh, what's sad is new cars in accordance to ADR can be almost 3 times this difference in the example and be in spec lol
I'm the director of VSH (Vlad's Spec Holden), because HSV were doing it ass about.

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Re: VX Cluster PPK

Postby Tre-Cool » Sat Apr 21, 2018 12:26 pm

speedo output pulse comes from ecu, going from auto to manual your pulses frrom ecu will be a lot lower because the manual pulses 17ppk vs 40ppk from the auto.

you need to modify the ecu tune.

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