diff ratio help ae86

[nath85]

Hi i have a ae86 and has made 300hp atw im wanting to take it to the track so want the best out of it was thinking a 3.9 ratio diff head lsd, or 4.1 can i have peoples thoughts and any help would be great thanks im running a w55 gbox and hilux diff.

[marvis]

Either one will be good. I'd personally run a 4.1

[nath85]

Ok cheers may have to test out both, also going to build another engine that will prob have abit more talk and hp so maybe 3.9 be better option as only revs to 7.5rpm max