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Originally Posted by brembo
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Originally Posted by coombsie66
Just watched that vid, ummmm i hope they had it that rich on off boost over run for flame out photo oppertunities, as its a tad ridiculous!? :roll:
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I guess its done to get the flame effect in some degree, but to run it very rich on off boost helps cooling the pistons...... 
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... and coke up the whole combustion chamber and exhaust ports/system causing higher temperatures in the places where the carbon deposits build up.
I spose the rebuild that engine all the time anyway, so wouldnt matter.