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VN Calais speedo out by 20kph
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Taz2 Offline
#1 Posted : Sunday, 20 March 2005 6:38:03 PM(UTC)
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My VN Calais speedo is reading 20kph higher than it should.
I'm running a 3.9 diff ratio and a tricked turbo 700 at present with an HSV performance enhanced V8.
I've tried 3 different speed sensors, but all read too high.
Till now I've assumed the higher reading is because of the diff ratio, but my local Holden dealer tells me that there is only one speed sensor for all variations of diff ratios. Just wondering if this is correct, or is there a different sensor for commercials running a higher diff ratio.
What else could the problem be?
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commodorenut Offline
#2 Posted : Monday, 21 March 2005 7:27:56 AM(UTC)
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Nope, they all ran the 3.08:1 diff apart from selected HSV models (and 1 particular VP model).
The factory ones with shorter diffs were manuals where you can change the gear on the end of the speed sensor - unlike the autos where only the 1 gear is avail
Cheers,

Mick
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crowe Offline
#3 Posted : Monday, 21 March 2005 7:31:32 AM(UTC)
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Australia
This is where the pmop chip (i think thats what its called) comes into play for diffrent trany/diff combos
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commodorenut Offline
#4 Posted : Monday, 21 March 2005 7:41:25 AM(UTC)
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From VT onwards you can change the PPK (pulses per kilometre) value in the ECU, which then feeds the cluster - to compensate for different wheel/tyre rolling diameters, and different diff/trans combos.

Unfortunately, in VN-VS, (apart from those with a
Cheers,

Mick
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Taz2 Offline
#5 Posted : Monday, 21 March 2005 4:37:20 PM(UTC)
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Thanks Mick & Crowe.
Don't think we have a Jaycar store in Launceston....I'll try Dick Smith.
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commodorenut Offline
#6 Posted : Monday, 21 March 2005 5:45:03 PM(UTC)
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Bruce, it'll need to be Jaycar, as Dick Smith don't have an equivalent product.
You can mail order thru Jaycar's website, http://www1.jaycar.com.au/
Or you can visit a local Jaycar dealer:
Active Electronics
** Premium Dealer **
70 Wellington Street

Edited by user Monday, 21 March 2005 5:46:11 PM(UTC)  | Reason: Not specified

Cheers,

Mick
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HK1837 Offline
#7 Posted : Monday, 21 March 2005 10:28:35 PM(UTC)
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This may be the answer for fitting VN engines into early Holdens, without having to buy the $250 Castle Auto electrics pulse converter or running the VN speedo hidden somewhere under the dash. When we converted my mate's WB to a VN 5.0L we used a speedo T
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#8 Posted : Tuesday, 22 March 2005 2:31:13 AM(UTC)
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any decent auto elec can make a pulse modifier.
and calibrate your speedo on a dyno.
mine was done by a dyno tune guy in sydney, cost me $95 all up.

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#9 Posted : Tuesday, 22 March 2005 6:13:04 PM(UTC)
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This sounds like a pretty nifty device!
But where about does it go, between the gearbox and ECU or at the speedo end or???
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commodorenut Offline
#10 Posted : Wednesday, 23 March 2005 2:24:22 AM(UTC)
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VN & VP run a 3 wire hall effect sensor on both manual & auto. In VN & VP you have to put it between the gearbox & speedo as the signal goes from box, then to the speedo, then to the ECU.

In VR & VS, it all changed. The signal goes from box>ECU
Cheers,

Mick
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Dr Terry Offline
#11 Posted : Wednesday, 23 March 2005 3:35:33 AM(UTC)
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Hi guys.

Another fix is to change the speedo gear, they are the same format as a TH350.

You will have to calculate the tooth count you require & then buy the gear, which may or may not be difficult to procure in Australia.

The alternate method is
If at first you don't succeed, just call it Version 1.0
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#12 Posted : Wednesday, 23 March 2005 5:58:38 AM(UTC)
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thanks for that info, gentlemen.
I've corrected my error partially by going to 60 series tyres, but would prefer the adjustable option described above.
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Taz2 Offline
#13 Posted : Wednesday, 23 March 2005 6:56:04 AM(UTC)
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Thanks for all the info Mick.....very interesting stuff!!!
Checked all the VP's at work to see if we had one of the exceptions in regards to the diff ratio. All were GU4's.
Checked all the other VN onwards....all GU4!
*** EXCEPT....one VR HSV GTS...GM3
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HK1837 Offline
#14 Posted : Wednesday, 23 March 2005 7:24:08 AM(UTC)
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After all this discussion, can the Jaycar pulse modifier do the same job as the Castle one ie change the pulse count from 10 per rev to two? Being an Electrical Engineer I'm sure I could make one, but that sounds too much like 'work' as opposed to playing
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commodorenut Offline
#15 Posted : Wednesday, 23 March 2005 7:48:39 AM(UTC)
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The T56/5.7L/215kW cars got the 3.45:1 diff in them - same ratio (gears too actually) as the VL diff - hence the same GM3 PO code.
Cheers,

Mick
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Holdenute Offline
#16 Posted : Wednesday, 23 March 2005 5:57:42 PM(UTC)
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As Dr Terry says, the speedo cog is probably the easiest change in this case. When I fitted my T5 into my HZ ute, my speedo was running about 20k's over. I picked up my speedo cog from Ford. They are the same. From memory Holden didn't carry different rat
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