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120Y speedo reading too high?
Posted: Wed Nov 13, 2013 12:29 pm
by Datto_610
The speedo in my sister's 120y is reading 10kmh over ie 50kmh on speedo is actually 60kmh. Everything on the car is factory 12" rims with 155/80 tyres. Could the gauge be at fault or maybe speedo cable? Any help much appreciated
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Re: 120Y speedo reading too high?
Posted: Wed Nov 13, 2013 1:17 pm
by classicdat
No, that is right, this is how they roll.
My 12ie on 13x175/70s is about right. 185s would be 100% I would think.
From factory they were optimistic.
Re: 120Y speedo reading too high?
Posted: Wed Nov 13, 2013 1:30 pm
by Datto_610
Haha alrighty Vaughan. She sat her restricted yesterday and passed but the fella said he would've failed her if she was doing her full due to the incorrect speedo. Looks like I'll be finding her some 13's for xmas/birthday!
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Re: 120Y speedo reading too high?
Posted: Wed Nov 13, 2013 1:45 pm
by beaver
what a load of shit haha. All cars speedos are out, older ones more so.
Re: 120Y speedo reading too high?
Posted: Wed Nov 13, 2013 5:55 pm
by classicdat
That's only where the numbers are, who uses them, mines in mph, so will he fail me for going too slow, fast or not having a new car. Test isn't about the car but how you drive it, I am aware of my car and drive it accordingly. Good news she has restricted tell her we expect to see the wee beast on the Dec port hills cruise.
Re: 120Y speedo reading too high?
Posted: Wed Nov 13, 2013 5:57 pm
by Datto_610
Haha yeah I'll be sure to let her know! But her speedo is in both mph and kph!
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Posted: Wed Nov 13, 2013 7:30 pm
by woodies72coupe
Ive got a spare spedo cable if u want to try it?
My 1200 spedo is also miles out. 40 mph is 50kmp. Random.
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Re: 120Y speedo reading too high?
Posted: Mon Nov 18, 2013 10:43 pm
by EMs SR1200 UTE
With my old datsun ute, (the white one in my avator) my husband pulled the speedo out and the coil spring inside which controls the speedo needle, he stretched it out webit so the spring had more tension on the needle.
The faster you go the speedo cable turns the mechinism that winds up the coil so the needle goes up, more tension on spring the less needle wants to increase in speed. Less tension by compressing spring again will increase needle speed.
My old ute had a 5speed and was on 17s, so the speedo was way out.
Get a navman, adjust the spring a tiny bit and give that ago, worked for us
Re: 120Y speedo reading too high?
Posted: Sat Nov 23, 2013 10:39 pm
by Dattodevil
Speedos always read high, even in old cars. Designed to make you think you're going faster than you really are.