pinion size with a gtb

[footey]

hi just fitted a 4.gtb in the worlds car wanted to know if anyone could suggest what size pinion i should start with { im no good working ovarall ratios out}

[LEGEND]

Hi there, which spur are you running. If you are running a 78 then you want to be somewhere in the area of 15,16,17 but if you are running a 81 then you might be able to take it up a pinion, or something in that range. And is it a 4.5 because on the post is says 4.gtb

[footey]

ye its a 4.5 and its kit spure gear

[NeilD]

That car was faaaaaaaaaaaaassssssssstttttt on Sat. night.

[footey]

cheers neil hope its as quick outdoors i just put a 16 pinion on i think

[NeilD]

It'll be great outdoors mate.

[LEGEND]

My Bj4we was bloody fast with a 4.5 gtb in it. So fast, that one night down at TRCC i decided , in the break between finals and qualifying, to launch my car up a ramp going straight up the far wall. It was so fast that it actualy hit the roof, not only once but twice. After, it didnt do to well in the final.

[rich_cree]

16/78 would be a decent starting point I should think