LOGIE Posted January 20, 2014 Share Posted January 20, 2014 If I remove my TT j spec clocks and speedo converter and put the loom wiring back to standard (from converter splicing) could I then fit my UK clocks/speedo cluster and still have unrestricted speed? Ta Quote Link to comment Share on other sites More sharing options...
imi Posted January 20, 2014 Share Posted January 20, 2014 Isn't there a sensor on the gearbox too? Quote Link to comment Share on other sites More sharing options...
LOGIE Posted January 21, 2014 Author Share Posted January 21, 2014 Isn't there a sensor on the gearbox too? Yeah there's 2 speed sensors but I dont think they should effect the clocks mate. Anyone? Quote Link to comment Share on other sites More sharing options...
David P Posted January 21, 2014 Share Posted January 21, 2014 With that combo you'll have an mph reading gauge and limited top speed. Quote Link to comment Share on other sites More sharing options...
stevie_b Posted January 21, 2014 Share Posted January 21, 2014 As David said. The speed limiter function is in the ECU. To remove the speed restriction, you either need to fit an ECU that doesn't have a speed restriction (i.e. a UK spec ECU, these might still have a higher restriction at 155mph though) or feed the ECU with a false speed value (which is what the delimiters do). Quote Link to comment Share on other sites More sharing options...
Big Supes Posted January 21, 2014 Share Posted January 21, 2014 (edited) As David said. The speed limiter function is in the ECU. To remove the speed restriction, you either need to fit an ECU that doesn't have a speed restriction (i.e. a UK spec ECU, these might still have a higher restriction at 155mph though) or feed the ECU with a false speed value (which is what the delimiters do). I can vouch that the UK Spec ECU is not limited to 155mph. I know the UK spec ECU differs in other areas though... something to do with the air flow meter, IIRC. Edited January 21, 2014 by Big Supes (see edit history) Quote Link to comment Share on other sites More sharing options...
imi Posted January 21, 2014 Share Posted January 21, 2014 Yeah there's 2 speed sensors but I dont think they should effect the clocks mate. Anyone? What about the steering, active spoiler (if applicable) and gearing (of auto)? Quote Link to comment Share on other sites More sharing options...
stevie_b Posted January 21, 2014 Share Posted January 21, 2014 Yeah there's 2 speed sensors but I dont think they should effect the clocks mate. Anyone? I'm pretty sure the speed sensors don't affect the clocks. As imi said, the ECU will need to get a speed signal to control the things he listed, but changing the clocks to UK ones and removing the speed converter won't affect the speed sensors if you do it properly. Quote Link to comment Share on other sites More sharing options...
LOGIE Posted January 21, 2014 Author Share Posted January 21, 2014 So my best/easiest option is just leave my speed delimiter behind the dash and just fit the UK clocks? Quote Link to comment Share on other sites More sharing options...
Big Supes Posted January 21, 2014 Share Posted January 21, 2014 Definitely. Quote Link to comment Share on other sites More sharing options...
LOGIE Posted January 21, 2014 Author Share Posted January 21, 2014 I take it there are different types of delimiter? I think most are wired into the engine ecu wiring in the passenger footwell. Mine is behind the clocks and wired into the milage odometer. I have travelled at speeds of 140+leptons so I know it works. So there is no real bonus to having uk clocks aparts from cosmetic value ie a nicer speedo dial? Quote Link to comment Share on other sites More sharing options...
Big Supes Posted January 21, 2014 Share Posted January 21, 2014 Correct mate. The main bonus of switching to UK dials is for those who haven't converted over to mph; it's basically plug & play. Quote Link to comment Share on other sites More sharing options...
stevie_b Posted January 21, 2014 Share Posted January 21, 2014 I take it there are different types of delimiter? I think most are wired into the engine ecu wiring in the passenger footwell. Mine is behind the clocks and wired into the milage odometer. I have travelled at speeds of 140+leptons so I know it works. So there is no real bonus to having uk clocks aparts from cosmetic value ie a nicer speedo dial? Sounds like you have a combined speed converter and delimiter. A pure delimiter is usually wired in beside the ECU in the passenger footwell, because that's the only thing the delimiter bit needs to talk to. The combined unit need to feed an altered speed signal to the speedo, hence that's where it usually is. Quote Link to comment Share on other sites More sharing options...
LOGIE Posted February 2, 2014 Author Share Posted February 2, 2014 Ok just been for a run with uk clocks looking at the speedo I was convinced I was diing more than 50mph I put my gps speedo on and I was actually doung about 75mph so there is a problem with fitting a uk speedo with the speedo converter. Anyone know how to get uk clocks working in a j spec car without being limited to 112mph? Quote Link to comment Share on other sites More sharing options...
GMan Posted February 2, 2014 Share Posted February 2, 2014 I think the converters feed the mph signal to the ecu so your Supra will problably be 'limited' to 180 mph! come visit me here in Germany and there is a perfect strech of Unlimited autobahn 25kms long perfectly straight 4 lanes to test it legally! Quote Link to comment Share on other sites More sharing options...
stevie_b Posted February 2, 2014 Share Posted February 2, 2014 I think the converters feed the mph signal to the ecu so your Supra will problably be 'limited' to 180 mph! come visit me here in Germany and there is a perfect strech of Unlimited autobahn 25kms long perfectly straight 4 lanes to test it legally! I thought the speed signal passed around the loom was a pulse signal that pulses something like 4 times per roadwheel revolution. Quote Link to comment Share on other sites More sharing options...
LOGIE Posted February 2, 2014 Author Share Posted February 2, 2014 Anyone? My uk clock were saying 50mph but I was doing about 75mph according to gps device. I have the speedo converter/delimiter still fitted from j spec clocks. Should I remove this? Quote Link to comment Share on other sites More sharing options...
Rob W Posted February 2, 2014 Share Posted February 2, 2014 I'm guessing you just needed a seperate delimiter not the combined you have. Maybe the converter is interfering with the clocks giving an inaccurate reading. My UK clocks should be with me this week and hopefully have time to fit them. I'm taking my combined converter/limited out and putting it all back to stock. My mines ecu has a built in delimiter. Quote Link to comment Share on other sites More sharing options...
ScottC Posted February 2, 2014 Share Posted February 2, 2014 (edited) Ditch the convertor and just run the delimiter. Edit: In fact with all the problems you've been having I would remove both and just run stock until you have ironed out all the other issues. Edited February 2, 2014 by ScottC (see edit history) Quote Link to comment Share on other sites More sharing options...
LOGIE Posted February 2, 2014 Author Share Posted February 2, 2014 Ditch the convertor and just run the delimiter. Edit: In fact with all the problems you've been having I would remove both and just run stock until you have ironed out all the other issues. Makes sense mate. Wiper issue is killing me. Cant even take it to a sparky in case it rains. (Going to a sparky for abs fault) I gave up on it mate. Quote Link to comment Share on other sites More sharing options...
ScottC Posted February 2, 2014 Share Posted February 2, 2014 It could be what's interfering with your o/d Quote Link to comment Share on other sites More sharing options...
LOGIE Posted February 2, 2014 Author Share Posted February 2, 2014 It could be what's interfering with your o/d Od is perfect mate car drives great. Just no MANU, ABS light still on and no front wipers..... rear wipers plus all washers are fine. Quote Link to comment Share on other sites More sharing options...
stevie_b Posted February 2, 2014 Share Posted February 2, 2014 Anyone? My uk clock were saying 50mph but I was doing about 75mph according to gps device. I have the speedo converter/delimiter still fitted from j spec clocks. Should I remove this? I think that means you're converting the speed "twice", which would tally with your 50 vs 75 readings. The speed sensor tells the clocks (and the rest of the loom) the speed by sending a pulse every 1/4 revolution of a roadwheel. The JSpec clocks convert these pulses to a number in kph. The UK clocks convert these pulses to a number in mph. A converter typically multiplies the clock reading by 5/8 (i.e. it reduces it). So, the pulses were multiplied by 5/8 (which would convert 75 to approx 50). This then gets displayed by the UK clocks as a mpg value. To see speeds in mph: 1) run JSpec clocks with a converter; or 2) run UK clocks without a converter To see speeds in kph: 1) run JSpec clocks without a converter. Running UK clocks wih a converter will give you mph multiplied by 5/8, which isn't a standard unit of speed! Quote Link to comment Share on other sites More sharing options...
LOGIE Posted February 2, 2014 Author Share Posted February 2, 2014 I think that means you're converting the speed "twice", which would tally with your 50 vs 75 readings. The speed sensor tells the clocks (and the rest of the loom) the speed by sending a pulse every 1/4 revolution of a roadwheel. The JSpec clocks convert these pulses to a number in kph. The UK clocks convert these pulses to a number in mph. A converter typically multiplies the clock reading by 5/8 (i.e. it reduces it). So, the pulses were multiplied by 5/8 (which would convert 75 to approx 50). This then gets displayed by the UK clocks as a mpg value. To see speeds in mph: 1) run JSpec clocks with a converter; or 2) run UK clocks without a converter To see speeds in kph: 1) run JSpec clocks without a converter. Running UK clocks wih a converter will give you mph multiplied by 5/8, which isn't a standard unit of speed! Well that is a very comprehensive answer. Thanks for that mate. If I put Uk clocks in and remove the delimiter/converter will I be restricted to 112mph? Also will my odo go up in miles? Quote Link to comment Share on other sites More sharing options...
Homer Posted February 2, 2014 Share Posted February 2, 2014 This is an interesting one and Stevie's theory makes absolute sense. I approached it in a slightly different way when I fitted UK clocks to my jspec, I just changed the speedo dial itself and retained the jspec cluster and circuit board. The speedo needle did need resetting manually (pulling it off and pushing it back on at 70mph using a GPS, at bit tricky!). After doing that I now have a UK speedo that is 100% accurate at any speed I retained the speed convertor which was already in place for the jspec clocks so kept the ODO in Miles, retained the power steering adjust and the active spoiler deployment to the correct level. The speed limiter is also removed, which has been tested in full Quote Link to comment Share on other sites More sharing options...
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