What causes pops on deceleration?
Decel popping is caused by the detonation of unburned fuel in the exhaust pipe. This happens with high flow exhausts that allow more fresh air to be pulled into the pipe, causing the exhaust temperature to rise and detonate any unburnt fuel.
What makes a car backfire when you let off the gas?
Lean Air/Fuel Mixture Not only can a rich air/fuel ratio cause a backfire, a mixture that doesn’t have enough gasoline can cause a backfire, too. When a lean mixture combusts, it burns more slowly, meaning there will still be some air and fuel that isn’t used up when the exhaust valves open — leading to a backfire.
What can I do about the popping on deceleration?
To REDUCE (it may not totally go away) popping on deceleration first make sure that you do not have any intake or exhaust leaks. If all that checks out then you can alter the fuel curve at closed throttle to help this problem. If you are using a PCIII then go into the 0% column of the software and alter the fuel curve from 1750-5500rpm.
Why does my bike pop when I decelerate?
Popping on deceleration is due to unburnt fuel being ignited in the exhaust. The reason you do not hear this on a bike with a stock exhaust is due to the baffling of the stock exhaust. It is not only much quieter but also does not allow the fresh air to enter the exhaust due to reversion.
Can a Vance and Hines FP3 be tuned to eliminate decel popping?
Yes, this would definitely improve your performance. We would suggest tuning with a Power Commander, or Vance & Hines FP3. You can eliminate decel popping by adding aprox 5% fuel at 0% throttle; between the RPM range of 1,500 and 3,500 RPM. Where can I find the part to add 5% as suggested on FP3?
Why is my exhaust popping on deceleration backfire?
Exhaust Popping on Deceleration Deceleration backfire is caused by fuel burning in the exhaust manifold or header. Something you should understand before going any further is that a motor in perfect tune will exhibit deceleration backfiring. Just because your exhaust is popping, doesn’t mean there’s anything wrong.