I run my 18b inside w/a 2100 MA 2s pack for up to 45 min. non stop w/out heating issues. We run mostly 1/2 to 3/4 throttle, but, we are constantly on/off the brakes. We are using foam tires.
http://www.youtube.com/watch?v=DH464JxEkoQ
Mine is the white car for those who are interested.
Gearing is 60 / 14 for basement racing.
1. MBX-6 T8 1900KV, RX8 ON 4S
2. MBX-5T 1520, MMM ON 5S
3. MBX-5 ONROAD CONVERSION 1515, MMM ON 5S
4. MRX-3 ON ROAD CONVERSION 1512, MMM ON 6S
5. TEN T 2650 T8, MMP ON 3S