Am I correct in thinking,

 

If you put a Jap speedo, including the electrics attached to it which moves the needle, into a UK dash, the speedo will then start working in KPH. I.e. if I was doing 50mph will the Jap speedo show 80KPH in a UK dash?

 

Stuart

It works in reverse, ie UK speedo into the Jap cluster. And it is accurate, in my case, to 1mph.

I think you might find it'll limit your speed to 115mph too !

 

I bought a chip to adjust my clocks and remove the speed limiter but I'm told putting uk clocks in would have had the same effect.

 

115mph sucks ! :mad:

I was told I needed to de-limit the car as well as putting a UK speedo in, but I have found that the car is still going strong at 120mph. SO maybe the uk speedo did de-limit it. Or maybe it was not limited in Japan, (I imported it). I did find that I had to fit just the speedo itself into my Jap clock set, as it were, as the binalce from te UK car had different connections. Works fine though.

Well I was thinking along the lines of a US dial.

 

Do you reckon that would still then read correctly cos US dials are slightly different

I have no experience other than doing mine, but I would think that the different readings required for different countries would be in the speedo itself. And so I would guess that a USA speedo would be OK. IMHO of course. But I would try it.

Well thats what I thought.

 

I asked TT.net and they said they all have different speed sensors which I find hard to believe due to the fact that speed sensors just picks up a pulse from teh gearbox, so if it sends different signals, its really the thing in the gear box that has to be different for Jap UK and US. I can under stand car manufactures making different electronics for different years, but not different gearbox internals

 

Stuart

Er, I think that sorta makes sense as my speed conversion chip involved converting the eight pulses from the box to 5, or something like that apparently! Suggests the box was outputting km pulses, not miles I guess ?

Well may have something to do with KPH to MPH is divide by 8 times 5. Convert 8 to five.

 

Anyone with a KPH dial that I can test with?

 

Stuart

I dont think TT.Net is right. In fact in my case it is wrong, which is a fact.

The sensible way, and I know not every car manufacture is sensible, would be to change the speedo to suit the country, as they are making different ones for different measurement, ie MPH or KPH.

My understanding is that the 'conversion' is done in the speedo. It takes in pulses from the speed sensor and converts them into displaying for whatever dial it has. IIRC US speedo's go to 160mph, Jap go to 180kph (or mph when using a convertor box) and UK are also 180mph (I think - will have to go check mine now)

Yes UK ones are 180.

 

But do you think that all speedsensors send the same information but its just the dial that inturprets it differently.

Did on mine, and why change two items when you can only change one, as in Nissan when they make the car.

Yes.

 

Originally posted by SRRAE

Yes UK ones are 180.

 

But do you think that all speedsensors send the same information but its just the dial that inturprets it differently.

I concur - otherwise my 300kph speedo would require a different speed sensor.. (It's an aftermarket Japanese speedo)..

 

So short answer - yes, US speedo will work in a UK/J car..

 

However - it might throw your odometer out, unless you changed to a US odometer too, as the odometer takes it's feed from the speedo.....

Ahh there is another thing Aaron. I heard that if you put a UK dial into a Jap dash, it will read MPH and the odometre starts working in miles too because its connected to the speedo.

 

But if you put a speed converter on a Jap Kph the odometre still works in K's

 

I just confused myself

Now theres a thing, I changed my odo to miles, and did not think it would be anything but correct. Now I will have to check it.

But if you are putting the converter in before the speedo , and the odo is taken form that, then it will read in miles because the signal has been changed before the clocks ( in theory )

Ah but I changed my jap speedo to uk, so I have no converter. So is the signal from the gearbox changed by the speedo and then sent to the odo, or is the odo different? Or is the signal from the gearbox changed in the binacle and then sent to the odo?

Don't forget that the US dash doesn't have a rev counter. In it's place is a perfectly shaped quarter pounder holder.

Ok, thinking again..

 

If you change the speedo, the odometer will work in whatever units the speedo does - because the odometer takes it's signal from the speedo..

 

So US speedo will still read in miles.. UK speedo in Jap car will read in miles..

 

If the convertor is before the speedo - which it must be, as oneday says, the odometer will read in miles, because the speedo does.. Actually .. It might depend on the type of convertor - that's how mine worked, at least, but then it actually interrupted two speed signals comign into the speedo head..

Hmmmm!