[masraum]

Originally Posted by stevej37

it's not bubbles...it's burbles.
I belong to the Civic SI forum and hear it mentioned frequently.

I was going to say, "what the hell is bubble tune?"

But that makes sense, burble.

The funny thing is that burbles are natural with a carbed motor. Then modern FI came along, and engineers realized that they could increase efficiency but cutting fuel flow when a car is coasting, so they implemented that.

But folks hear race cars burbling, and want their cars to sound cool like that, so they are pumping fuel into the motor when coasting.

So it's intentional inefficiency for aural aesthetics. It does sound cool, but I wouldn't turn it on unless there was some sort of actual performance reason for it.