jasear

thanks colin. So youre saying it is possible to manipulate the convertor to perhaps overshow the speed? Any ideas of how to do that? I mean how exactly would i modify the speed signal going to the convertor?

GF-SXE10. Is that an RS200? If so then what variant?

can you be a bit more specific as i am a complete ameture.

Well like i explained earlier that my Altezza failed sva because it was showing 30 when it was actually doing 36. After a lot of research i have been able to find out that if the speedo is even undershowing by a mile its a straight fail on the other hand if it is overshowing by 10% then you could still get away with a pass. Im sure there must be some way of calibrating the speedo so that i can get the car to pass the sva. Anyone have any idea?

Its a 1999 registered altezza RS200. Am not sure of the exact variant as of yet. Car is in immaculate condition. Siver colour, with SVA, 12 months mot, 12 months tax. Rear spoiler, 17 inch altezza alloys e.t.c. Ive just bought this and i just wanted an idea as to how much they are worth. Hasnt passed the SVA yet but assuming it has how much would it be worth?

why did they fail my car then? sounds like double standards to me. With the brake i think it could be the brake pads or something.

And if its a faulty speedo then what kind of expense am i looking at?

lol! ure right. I think thats it! must be something wrong with the unit or maybe the guy hasnt connected everything properly. Saying that though, can you think of any other problem that could possibly cause this?

I assume by the connector you mean the conversion unit. I think ure right cause what ure saying makes a lot of sense. Something like that would result in what is happening to my car. but if u miss a pulse shouldnt it result in showing the speed being less?

Well it has 17" wheels. Now the thing is i dont think its got anything to do with the wheels. Cause when the car is showing 60 it is actually doing 60, At 70 it shows 70, but as u slow down and do 50 it shows 50 on the speedo but its actually doing 51, then at 40 its actually doing 43, when it shows 30 its doing 36. If it was the wheels then as the speed increases the margin of error would also increase. But here we have an opposite situation which i really find very strange. Could it be the conversion unit? The guy who prepared my car for the sva says he has never come accross anything like this and finds it really strange. he is going to try and put in a new unit and see how it goes. Im really mystified.

thing is I havent checked the size and the car is not with me so i cannot check right now. I think they're probably 17". but i will check that today and let you guys know.

Well the wheels i think are either 17 or 16 inch. So what could be causing this problem then?

well it has the standard wheels. Im thinking that could it be something wrong with the speedo conversion unit they put in to convert from km to mph?

Well it had its test today and failed on emmissions, and something wrong with the speedo i.e. it showed 50 on the clock when it was doing 53, 40 when it was doing 44 e.t.c. is that a big problem? It also failed on some depleted braking thing. Not sure exactly what that is but was told its a test of the brakes when the car is switched off?? Any advice would be greatly appreciated.