Digi Dash (red switch)

[bad_boy_nova]

On the top of my digi dash, there is a red switch. Does anyone know what it is for? Cheers

[Ste_Nova]

tyre sizes

[bad_boy_nova]

So, will that affect what reading the speedo gives? Ive got 195/45/16 tyres, which way should it be switched? Or should i put it on the rolling road because that will give an accurate road speed reading and switch the switch until its right?

[mikeoxford]

if it appears to read a close speed then leave it. flicked the other way will send it well out.

if you want it calibrating to the nearest .00000000000001 itll be the speedo driven gear in the gearbox u replace whilst on a RR.

wheel size, tyre size will effect it so much, dont expect the red switch to sort it

[pickle]

get a mate and drive 30mph and see if your doing the same speed as him.or her. i have exactly the same size tyes and a dash too, but i cant remember which way i flicked the switch.sorry mate, try......... right!

[bad_boy_nova]

When my car was on the rolling road, the bloke said to me that my speedo was out by about 3 mph, he said it was saying i was going 3 mph faster than i actually was. I dont know whether he ment if i was going 10 mph it would say 13 mph and if i was going 100 mph it would say 103. Or if he ment it was 3 mph out at a particular speed.

[wisewood]

the nova tends to read approx 10% wrong.

[bad_boy_nova]

So at 100 mph on the speedo, you could really be doing between 90 mph and 110 mph, depending on which way the 10 percent is?

[Ste_Nova]

can over read... can never under read.. thats the law

[mikeoxford]

hence all the 1 litre peters thinking they can do 150 mph down a hill