don't try it, the motor should be ok on 3s for a few "speed runs" but the esc will most probably pop when you plug it in
also just because someone else managed to do it with there esc it doesn't necesarily mean yours will work as i have found a few times
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cars:
vintage 1988 tamiya grasshopper
Brushless CRT.5 - Mamba max - medusa 36-50-4800 motor - ftx 5K lipos
Brushless CRT - Mamba monster - Neu motor - RCPD conversion kit {for sale}
Ebay items :
http://shop.ebay.co.uk/merchant/terzo53