speedo out

[novacraig]

hello everyone

i have got a 1.2 carb nova and i was on private roads and it was sayin i was doin 120mph at 6500rpm and i no that cant be rite is there anyway of sorting it

[Adam]

6500rpm in what gear?

[novacraig]

in 4th because it was a 4 speed gearbox and mods wise it has got a webber carb on it and ashley 4-1 manifold and the system to go with it

[Adam]

Hmm, thats probably 110ish mph, true speed.
Depending on box ratio/fd.

[Asa-James]

how big are your wheels? they play a big role, but i cant remember which way...

[novacraig]

185/50/15

[puss puss]

intrested bud not highjacking your thread or anything but my 1.0 litre vauxhall nova 4 speed reakons i can do 50 mph in 2nd gear (4 speedgearbox) is this true because i find it quite hard to belive myself lol.

[Adam]

Yeah.

You could do 50mph in first gear with enough revs(dont try it lol)

[olix99]

borrow a road angel or simillar GPS device that tells you your speed. This will give you a more accurate reading on your speed. There isnt really much you can do about the misreading speedos iirc, its just cave man technology lol

[novacraig]

well it isnt all bout my top end i was doin 20 n it felt like i was onli doin bout 10 mph tops in 2nd n i dunno but puss puss i have hit 70 in second by the speedo

p.s sorry but my tires are 195/50/15

[craig green]

Try replacing the plastic speedo drive that the cable screws into. I think when they wear the speedo gets worse!

[AndyGSi]

At least it's over estimating your speed, if it was the other way it could cause some problems. Imagine you got flashed going through a speed camera and your speed was reading 30mph.

[novacraig]

i no that what my dad is worrying about if that happen because i have only passed a month ago so i dont want no point on it

[Lee]

GPS is only 100% accurate on the flat, so dont try using a hill, the GPS will under read your speed lol

[novacraig]

could i of bent the speedo cable and that why it is out becuase i have put new dials in