its the drive shafts im a mechanic and i had it happen on my clio mk2 phs1 replace the hole shaft and it will be allright if it goes when your driving it will make you crash
easy fix this!!!! its the engine hitting the subframe/ and or steering rack, not axel tramp etc
i sorted mine by getting the uprated k tec dog bone mount.... and then slacken off the 4 bolts on the left hand engine mount (the one near the oil cap lol) pull the engine forward with the help of a bar/mate then re tigthen the bolts. Job done, mine never does this now, no mater how much right foot is given in 1st
I knew it was something to do with this mount. My car never used to get this banging from the passenger footwell (bulkhead) untill i had the cambelt done. The mount needs to come off for it to be replaced.... then it started. It was then obvious it just needed adjusting.