is 12 sec poss on an open diff?

[ekjim]

has anyone run a 12second pass on an open english diff ? i managed 13.5 at 110mph last season firstly on an open 3.77 diff then changed this for a welded a 3.89. this gave me the same!!! but because of my bodged job of welding, the diff broke on launching. as i've still not got the money together for a slip diff, i was going to fit a 3.54 unit on my quest to break into the twelves what do you guys think ?

[RUSTYPUP]

I doubt putting in a 3.5 will improve your times. Almost certainly make it worse

[quickrack]

Bigger the Ratio better your times will be eg 4.11 5.11

Any 1100 esort had them.

Stick one in and try it

[bortaf]

Depends really, if you go too low and need to grab an extra gear before the line it could be slower

[ASBO CAPRI]

A higher ratio in your diff would need a torquey engine to pull it and a light car. Most drag cars opt for the lowest ratio posible in the diff. 4.1:1 seems to be the best ratio even the v8 muscle cars with huge amounts of torque go for this ratio.

[ekjim]

thanks i was thinking of a higher ratio to begin with but when i changed from 3.77 to 3.89 there was no difference with et or mph, although the 3.89 was welded. i was in fourth gear across the finish line at just over 6000rpm. the reason i was thinking going 3.54 is some of the cossie turbo guys seem to run good times with this ratio, any other views would be appreciated

[emu]

The cossie turbo boys run good times with a 3.54 because they have shitloads of power and torque.

 

Bung in a 4.1