K1 loads quicker than sx3???

[MJL]

Hi,
I've just raced a Cat K1 against my SX3 they both
Have nearly same setups.
The only difference is mine had a SP 5.5R and the Cat K1 had a Orion Vortex 5.5T.
The rest is exactly the same.
I did notice that the K1 has a 98 spur gear on and mine had a 82. But the SX3 only goes upto a 90 tooth.

The K1 was stupidly faster than mine and I just wondered if its down to the car or its the Gear setup?

Has anybody got any advice?