alanfordtw-15

just a quick question, does anyone know if the sierra cosworth 170mph clocks will work properly in a normal sierra that has 150mph clocks or will the speed on the clock be out? thanks

COMEDY DAN

I fitted a set in a GLS and the speedo was fine, give or take 2 mph at 80mph next to my old focus.

To be fare the older the clocks get the less accurate they get anyway whether they is a coz or not.

Jim Galbally

WHY

if it wont do more than 150bph why chnge the clocks

the 150mph speedo is the one dead giveaway that mine's not a cossie, but i WONT change it becasue the car only does 140mph flat out

alanfordtw-15

im the same story mate, its a giveaway but mine wont do next nor near either of those speeds so wont make any difference i cant find 150mph white dial kits anyway so thats why actually thats a way better excuse

dojj

iTrader: (3)

if you want to put the cossie clocks in just to give you the white dials you might need to make sure the diff ratio is compatable with the cog in the gearbox

all the speedo's do 1000 revs per mile but if you are driving one at the wrong speed it will still give you the wrong reading (even thoguh it shouldn't, but yu know what i mean )

alanfordtw-15

its a 2 litre twin cam with a 7.5 inch diff which is the same size as cosworth diffs so mabey it should be the same going on that, thanks when its in ill drive next to someone going at 60 and see then how accurate- or not, it is, theres bigger wheels on it anyway so that would throw any clock out

dojj

iTrader: (3)

aha, you'll more than likely have the 7.5 inch diff with the 3.92:1 ratio in it
fairly easy to swap cogs in the box to give you the cossie drive ratio of 3.62(or 4):1

SS1

iTrader: (3)

http://www.autotintdesign.com/plazma...lazmadials.htm

there not cheep but glow BLUE OR GREEN got them in mine

you can get them in 170mph too