Guest bigGnonturbo Posted August 22, 2007 Share Posted August 22, 2007 Hi, can anyone tell me where the block they convert the speedo from kph to mph located. cheers Geoff Quote Link to comment Share on other sites More sharing options...
Guest gzaerojon Posted August 22, 2007 Share Posted August 22, 2007 it's normally piggy backed off the back of the gauge, mine is anyway Quote Link to comment Share on other sites More sharing options...
Guest Chumpalot Posted August 23, 2007 Share Posted August 23, 2007 Aren't some of the older ones located near the gearbox? Quote Link to comment Share on other sites More sharing options...
supra steveo Posted August 23, 2007 Share Posted August 23, 2007 mines in the dash Quote Link to comment Share on other sites More sharing options...
georigg Posted August 23, 2007 Share Posted August 23, 2007 Hi geoff, I'm assuming you have a speedo converter fitted(?) and are looking for a location. There are 3 ways a speedo can be converted. 1. The easiest, is simply fit a new "card" in the speedo.....you will know if this has been done to your car if the speedo only goes up to about 110MPH 2. The cheap Ebay converters. These are almost all fitted at the speed sensor at the gearbox. Basically, these "convert" if that's the word to use, the output signal, reducing it by 5/8ths so that the speedo will read at the "50" mark on the original KPH speedo head when the car is travelling at 80KPH. The problem with these converters is that the 5/8th signal can be fed on turbo models to other control computers which can louse up the auto transmission change up speeds, the cruise control if fitted ans some other of the speed related gizmos. The better converter is the one fitted at the speedo head. basically the "converter" reduces the signal, only going into the speedo and Odo for your non turbo. If you have one fitted and its faulty, it will be fitted behind the speedo head and there is a good write up in the Who to section on removing the speedo and top part of the facia. If you don not have one fitted, then the converter will allow your existing KPH speedo head to read in MPH(so you will have a 180MPH speedo) but there is a separate mod you will need to carry out to the Odo so that the KPH legend is changed to "MILES". Another thing to remember is that the converter simply changes the Odo to read in "miles" instead of Kilometres, so if you convert the car with the Odo reading 80,000Km it will then read in Miles but only by adding to the 80,000 figure. Its possible to get the Odo reading changed down to the equivalent "miles" reading, the cost is about £80-100 depending on where you get this done. For the Odo KM to Miles change see also the How to section..... there is a good write up there with photos which covers the Thor unit and the NCS unit(similar) which I fitted. NCS appears to be cheaper than Thor, £65 as against about £80 odd. Hope above is helpful. Rgds Georigg 94 Non turbo Aerotop Quote Link to comment Share on other sites More sharing options...
heckler Posted August 23, 2007 Share Posted August 23, 2007 mines in the dash mines behind the dash too. Quote Link to comment Share on other sites More sharing options...
Guest bigGnonturbo Posted August 24, 2007 Share Posted August 24, 2007 Thanks for all the help, can now get cracking on fixing the speedo. Quote Link to comment Share on other sites More sharing options...
silver_bullet Posted September 7, 2007 Share Posted September 7, 2007 easyest way is to tap into the loom on the drivers side of the gearbox , 3 wires .. Quote Link to comment Share on other sites More sharing options...
ronttuk Posted June 29, 2009 Share Posted June 29, 2009 anyone got any pics of what these look like ?? Quote Link to comment Share on other sites More sharing options...
tonyhawk Posted June 30, 2009 Share Posted June 30, 2009 I'd like to know too; my speedo and odo have stopped working! My car was imported from Japan about 5 years ago and I was the first UK owner; the importers did all the bits necessary for the the SVA and I've had it since. However about a week or so ago the speedo became intermittant and now it's pot luck as to whether it works at all! The ODO actually says 'miles' on the green readout, but the speedo seems to have an 'MPH' sticker on it, however I couldn't say if that was put there by the importers? I've had the entire dash off before now when I replaced the heater matrix and I don't think I ever saw a converter, but then I wasn't looking for one either. Would a converter add/change the word next to the milage to 'miles'? Any help would be VERY much appreciated. Ta. Quote Link to comment Share on other sites More sharing options...
SteveR Posted June 30, 2009 Share Posted June 30, 2009 Go look at the How To fit a speedo convertor/delimiter thread I did, there are some photos in there (Technical FAQ section). Quote Link to comment Share on other sites More sharing options...
stevie_b Posted June 30, 2009 Share Posted June 30, 2009 They vary in appearance. They tend to be approximately the size of a small matchbox, albeit thinner than a matchbox. The cheap ones look like 3 or 4 wires coming out of a black piece of chewing gum. They need to be wired into the speedo cluster and the odometer, so they're usually found lurking behind this region of the dash. They weigh basically nothing, so don't expect it to be screwed or bolted to anything. Would a converter add/change the word next to the milage to 'miles'? No, not by itself. A digital speed converter (DSC) will take the signal that it sees from the speed sensor(s), scale it back by about 5/8 and then send it to the speedo, so the speedo needle will point to (for example) the number 50 when the car's doing 80kph, instead of the number 80. Hey presto, the speedo says 50mph! IIRC, the odometer counts the mileage that the car's done by counting the clicks that it sees on its input. There are I think 4 clicks per roadwheel revolution (can't remember for sure, don't quote me on that). I know the Thor DSC comes with instructions on how to adapt the odometer to count in miles: I think it involves snipping a wire or two on the odo's circuit board. If you do want to convert your odo to count in miles, I would get the current reading knocked back so that it displays the total mileage so far in miles, not kms. Otherwise you'll have an odo which reads for example, 120,000, the first 90,000 being kms, and the remaining 30,000 being miles. It doesn't do any harm at all, but it just seems like an incomplete job IMO. Quote Link to comment Share on other sites More sharing options...
snake Posted July 2, 2009 Share Posted July 2, 2009 My speedo is reading spot on, but the top speed delimiter has suddenly decided to stop working. It was working before but will now only reach 120 mph on Rolling Road. Where should i start looking first?.I'm not sure if i have a separate TSD or a combined TSD/DSC unit. Quote Link to comment Share on other sites More sharing options...
stevie_b Posted July 3, 2009 Share Posted July 3, 2009 Where should i start looking first? I'm not sure if i have a separate TSD or a combined TSD/DSC unit. A stand-alone TSD is usually wired into the ECU only (hence should be located near the ECU), which is at the front of the passenger footwell. A combined TSD/DSC could either be in the same place, or more usually somewhere behind the dash, near the odometer display or the speedo cluster. As before, look for an approximately matchbox-sized "thing" with wires coming out of it. Quote Link to comment Share on other sites More sharing options...
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