Focus Fanatics - View Single Post - popcorn sound on deacceleration
View Single Post
Old 01-22-2013, 06:42 PM   #4
Focus Enthusiast
Continuous's Avatar
Join Date: Apr 2011
Fan#: 84970
Location: Pottsville, PA
What I Drive: 2004 SVT ZX3 Infra-Red

Posts: 148
FF Reputation: 1 Continuous Good Standing Member
Buy-Sell-Trade Rating: (0)
Basically the reason that they back fire like this is because of the compression ratio and that they use a higher octane fuel. Basically takes more to burn so therefore when it does combust during a downshift you here it cause the engine isn't masked as much by the sound of the exhaust leaving the car.
Infra-Red SVT ZX3
Continuous is offline  
    Reply With Quote