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wrong speed signal making car cut out

630 Views 8 Replies 6 Participants Last post by  Dean33GTR
Hi there, im new to the skyline scene and am still learing. tonite my speedo was jumping all ova the place, it kept sayin tht i was doin 180 when i was probs doing about 20. however once it gets upto about 40 it stops jumping and seems to work fine, once drops below tht, it instantly jumps all over the place again. when i boot it from below 40 it cuts out. also the power steering keeps backing off becase it thinks im doing silly speeds.

Another thing is when i came onto the motorway it said i was doing 90. but it diddnt feel like it and i wasnt flying past a truck i overtook.

i really annoyed as i only had the car 2 weeks today.

it is a r33 gts and has been converted to mph.

i think whatever they hav done to convert it to mph has come undone or something or could it be the speed sensor on the car?

pm me or write in here what you think it could be.

many thanks tom.
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I'd take it back to em mate and say what's happening, i don't know whats involved in the conversion part to if that's caused it. Something worth looking into though (if the r33 is the same is my r32) is a cog in the gear box which goes to the speedo. If something has happend to that it might cause it. I had that cog break up causing me to only have 1st 2nd and reverse gears when it lodged the gear box up. I'm not a mechanic but it's just something that sprung to mind reading this.
G
I reckon the coverter unit needs replacing, these are used to convert japanese or foriegn KMH units to UK MPH ones.

It's a thought.
Sounds like a cheap speedo converter has been used.

It will cut out when the speedo hits 180 as this is where the speed cut it. I had a car in the other day doing the same thing and it turned out to be the converter.

Richard
It could well be a dodgy speedo converter or if they've recalibrated the speedo head, it could be a problem with the soldering or a track not cut properly. Mine went a bit mental after i recalibrated the head and when i had a much closer look, one of the tracks that was meant to be broken had a tiny bit of swarf in it.
cheers, i didnt have the conversion done myself. it has been done by the previouse owner or the one befor that.

i hope it is just the convertor box or something, i hope it not the cog in the gear box.

thanks very much for leaving comments, if anyone else has any other input feel free to comment.

thanks tom
Lol had same problem with my skyline when i first bought it.
sometime it was ok sometimes it didnt work at all sometimes it regesterd silly speeds.
I had a vid on my old phone of the guages showing accelerating from 50 to 180 in about 5 seconds in third lol.
Will try and find it.
in the end i removed the converter chip and put the clocks back to standard, that was 2 years ago not got round to converting it properly yet!!!

Ps the r33 speedo is eletronic and has a speed sensor in the gearbox. no cogs.
thank god for that. i havnt yet had a look to see how it has been converted. im not sure if a convertor box has been used or there has been some cutting and soloring done on the back.

if i was able to get some new clock from the scrappy would this fix it? coz there one in a scrappy near me :)
thank god for that. i havnt yet had a look to see how it has been converted. im not sure if a convertor box has been used or there has been some cutting and soloring done on the back.

if i was able to get some new clock from the scrappy would this fix it? coz there one in a scrappy near me :)
The R32 uses a mechanical converter,R33 electronic or mod the clocks on the speedo PCB.
Probably nothing wrong with your clocks if they have used an electronic converter. The trouble is that a lot of people fit cheap 4 wire converters. You need a good quality 5 wire so that the ECU and Hicas gets the correct speed signal. They are about 60-70 plus fitting. Or just run it std in KMH, though you will still be speed limited. A bit of forum searching will give you more info.
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