Haywire grenades

Hi all,

A question regarding haywire grenades.
When In combat with a vehicle of some description, the 'to hit role' is made.
What I want to know is what happens next, the reason I ask is this.
I originally thought the rules said that you worked out effect of grenade first, including any saves before rolling for haywire effect.
Is this the case? Or is it that you roll to hit, then roll HW effect after which the tank/walker gets any armour save?
Cheers

Jk

Tanks don't generally HAVE armour saves, unless they have something like a Flickerfield.

You roll to hit, roll Haywire, and then if your opponent has a Flickerfield, he gets the save then. Think of the Haywire roll as being the same as a standard Armour Penetration roll.

I play against CSM so some of his walkers etc get demon invul saves, that I what I was meaning!
But thanks for answering!!