Change my ECU a few weeks and the car has started poping and banging,It only happens when i come off the gas and slow down with a bit of brake. when I put the old one back on no problem.But the new ecu gives me better mpg and more power. sound okay, but do not what to do any damage. Have a couple a engine upgrades. ECU,Greedy dump valve,De-cat exhaust.HKS Induction. Any Ideas ??? Or is this normal?

 

Is the dump valve a vta? it sounds like it. Its no probs m8 your just dumping unwanted fuel into a very hot exhaust pipe. Sounds cool doesn't it?

 

Chill mate, the pops and bangs are natural for an upgrade in the ECU, your car is probably running richer and with higher boost which means you dump more fuel on the over run and it's burning in the Zorst......... tis the nuts mate

 

go on wrap the down-pipe and make the temp of the outgoing gas higher and it will become snap crackle and pop heaven