Weird speedo problem

[maxfield]

Been driving the M3 today and noticed that when you let off the throttle the speedo goes to zero. When driving with some throttle on it gives an accurate reading.

Any ideas?

Jamie.

[e30318ilover]

Does all the clocks go down like revs temp?

[ProToZyKo]

Im guessing the contact on you diff, replace some wire back there.

[maxfield]

No just the speedo.

I thought it could be a dodgy.

[Kos]

out of curiosity, you running a 3.64 in the M3?

[maxfield]

Yep.

[Kos]

good mod, question is it a better mod than a carbon air box

[ProToZyKo]

It's the cable on the diff, usually you need to replace around 10-30 cm off it to fix the problem.
Had same problem soon it will not work at all.

[Alex]

+1 on diff wiring

[maxfield]

Kos - No, carbon airbox all the way! Going down the high street at 8k in first does bring some attention

Looks like the soldering iron is coming out tomorrow then