X12 Nosram in B4

[benknight13]

Hi
I have my X12 Nosram Pure in my B4 on a 81 spur gear and 20 spur gear which is what the gear chart says to run at and it wont stop over heating.Is there anyone out there that has had the same problem and know how to sort it?

My mate in touring cars said put a 13mm Rotor in it but is there no way to get it to stop over heating on the standed one?

I have tried going up on pinons and down but nothing is chaging how hot it gets.

Thanks
Ben