TC5 gearing?

[zagonielod]

Hi guys!
I've just recently bought a TC5R, and having a 10.5 Tacon in it right now. It has a 90T spur, and for the moment a 19T pinion.
I would like to ask,what would be a good gear ratio for this car. I have tried gearchart.com but I still don't know the result I get is good or not.
I will use the car for indoor carpet races and some drift challenges.
Could you guys give me some clues, were to start and what to have in mind when gearing the car?
I also have on my Madrat buggy a tekin RS with 13.5 redline, which is our stock buggy setup.
The TC5 came with an HPI combo,which currently is under investigation, it might have something, but the motor is a 4 pole 5900kv flux. If I could use this combo,again what gearing for that ?
Thanks in advance!