Thread: Speedo corrector 1hz pulse

Originally Posted by admiralranga

What errors do you get if you use a normal speedo corrector, want to have a fiddle to see if I can bodge a solution. Hoping it's a warning lamp over codes and that it goes away if you hook things up as per normal.

Usual story, bought a disco and stuck bigger tires on it and now the speedo's off. Now understand there's the Hunter DI Spares ones that do work but I've got a yellow box corrector from a previous vehicle so got nothing to lose.

Search is your friend. I ended up with a Hunter DI. However, during my pre purchase research on this forum I came across posts discussing issues that others had with a Jaycar kit that might give you some insights to what required for a correction device to function successfully in a D2.

Calculate & remember speed difference at 60, 40, 80 & 100kph & adjust speed via speedo accordingly.
IE at 100 on the speedo I'm actually doing 105 so I drive at 95 when appropriate.
Zero added expense.
Jonesfam

Originally Posted by jonesfam

Calculate & remember speed difference at 60, 40, 80 & 100kph & adjust speed via speedo accordingly.
IE at 100 on the speedo I'm actually doing 105 so I drive at 95 when appropriate.
Zero added expense.
Jonesfam

Except when using the speedo converter HDC still limits to a genuine 7km/h.
Worth it for that

Originally Posted by jonesfam

remember
...
Zero added expense.
Jonesfam

Not the best at the first bit, translates to expenses from the police.

Appreciate the suggestions, I've read most of them that I could find. Answer seemed to be mostly didn't work except one response to the jaycar unit (but I've also heard of them being bad in general) where it just responded super slowly.

Originally Posted by admiralranga

Not the best at the first bit, translates to expenses from the police.

Appreciate the suggestions, I've read most of them that I could find. Answer seemed to be mostly didn't work except one response to the jaycar unit (but I've also heard of them being bad in general) where it just responded super slowly.

I just use the GPS on a Garmin to see the correct speed on my D2 and D3. Nick

Originally Posted by onebob

..... I came across posts discussing issues that others had with a Jaycar kit that might give you some insights to what required for a correction device to function successfully in a D2.

I can confirm that the latest version of the Jaycar corrector doesn't work(properly).

It kind'a sort'a works, but does anomalous things .. like hold the speedo up at 40k/h when standing still, with the odo ticking over too!
It also had intermittent operation/non operation glitches, and the cruise control stopped completely.
Was removed 60 mins later, with no ill effects on the D2.

Brother thought it was worth a $40 gamble at the time.

Originally Posted by rick130

Except when using the speedo converter HDC still limits to a genuine 7km/h.
Worth it for that

Also shift and torque converter lockup points feel a bit wrong on a TD5 at least. No idea how they'd affect a V8 D2, but for a (tuned)TD5, the gearbox settings currently feels all wrong. So another reason to get the speedo back on track .... so to speak.

Originally Posted by AK83

I can confirm that the latest version of the Jaycar corrector doesn't work(properly).

It kind'a sort'a works, but does anomalous things .. like hold the speedo up at 40k/h when standing still, with the odo ticking over too!
It also had intermittent operation/non operation glitches, and the cruise control stopped completely.
Was removed 60 mins later, with no ill effects on the D2.

Brother thought it was worth a $40 gamble at the time.



Also shift and torque converter lockup points feel a bit wrong on a TD5 at least. No idea how they'd affect a V8 D2, but for a (tuned)TD5, the gearbox settings currently feels all wrong. So another reason to get the speedo back on track .... so to speak.

Thats strange, it sounds like it is holding its own very high (for a D2) base line frequency. The D2 does this at 1hz for diagnostics.

Is yours also a manual gearbox? If you fit a SCU to a manual, it seems that when there is a mismatch between the engine speed and the wheel speed it disables the CC. To get the CC back again, the manuals need to correct the diff gears and then calibrate the SCU to suit the diff gears.

The book apparently reads like the SCU shouldn't affect shift points, but I think it did and I have read the same of others.... so not sure. But with the power upgrades I do agree that the calibration of the gearbox is all wrong. I find it drives a lot better if left in sport mode on the highway.

Originally Posted by Slunnie

...

Is yours also a manual gearbox? If you fit a SCU to a manual, it seems that when there is a mismatch between the engine speed and the wheel speed it disables the CC. ...

Not mine, but brothers. basically the same thing tho .. I currently have it for my use

03 EU3(AFAIK). Other than the TRS tuned ECU, everything else appears to be stock. Is Auto.
The other anomaly it caused was that occasionally it also wouldn't drive the speedo until it hit about 20 or so(maybe 40) k/h too. That is, you'd be off from the the lights, speedo would remain off until it hit the said speed, then jump up to speed. Intermittent.

The only way to get the auto to change up, and not hold lower gear unecessarily is to give it a bit of a boot ful, not filly, just accelerate harder than you really need too. It then changes up a gear 'more quickly'.

eg. say at 30-40 on a very light throttle following traffic, it'll hold 2nd, rather than go into third(which would feel less thrashy). But if you hold back a little from the traffic and boot it to catch up, it'll change earlier and hold 3rd even if you accelerate again.
If you just hold the light throttle, which would be the sensible thing to do in traffic, it'll hold 2nd pretty much until about 40k/h, engine at 2500 or so and just feels wrong.

It's diametrically opposed to my D1 Tdi auto, which changes up very early(4th by about 30-ish k/h) but has zero torque by comparison.

I read that there's the possibility that the auto ECU out of a V8 may help with getting the auto to shift earlier. I have this(I have a parts V8 to muck around with). I want to give this a try too, to see if it does work for he TD5.
When my V8 project car was going, the gearbox was a lot more pleasing compared to bros TD5 self shifter .. so hope it'll help(changes and lockup).