Sorry, I have not had a chance to try it yet - the local 1/8th nitro track and motocross track that I test at are unusable at present.
However, this is the buggy/engine combination in action at a race meeting earlier this year it's the red white and blue MCD Race Runner. It won the race meeting, driven by the 2005 largescale world champion, Ian Oddie who also built the engine for me.
http://uk.youtube.com/watch?v=PA5YkVfT8ZA
Clive