Over raving cuts out

[fdb]

I fitted a aef fabia 1.9 engine. If I change down too low a gear by accident and overrev the van cuts out and puts the timing out. My mech says it's a safety cut out feature of the engine but why does it cut out and what can I do please

[mrhutch]

erm, fix the gear change and don't change down too early?

[mrhutch]

explain "puts the timing out"

are you saying the timing belt jumps a tooth?