Scotty
Supercharged
Pommie
Have a look/ listen
Have a look/ listen
CAT BYPASS, anyone has this one?
- Thread starter RooK
- Start date
owl
Turbocharged
Sorry Wolfie - snapped up by Zaphod on the UK owners site the second I hinted that I might want to sell them.
Dobieman
.020 Over
- Joined
- Mar 20, 2007
- Messages
- 49
I just installed D&D's last week and this eliminates the litter box. I also downloaded a new map with Tuneboy. I have minimal popping on decel and only at the very bottom rpm. There are some tweaked maps increasing fuel to the low rpm areas to stop or reduce popping. I havent tried one yet but will in the near future.
My limited experience with decel popping.
Two bikes ago - Kawaski ZZR1200
Installed after market half system. Popped like crazy. Carburated bike so I had a jet kit professionally installed and dyno tuned. Minimal popping after that. Tuner said "they all pop a little on decel - just dont notice it with the stock baffles and cat".
One bike ago - 2006 Triumph Speed Triple 1050
Installed Leo Vince half system - popped excessively.
Dowloaded a Tuneboy dyno map - not available on TB site but created by Wayne at TB and the popping was completely gone. Just a smooth burble on decel.
This leads me to believe it is a fueling issue that can be corrected with the correct map for your set up.
I am not a tuner so I dont really know but my experince above tells me it makes sense. :?
My limited experience with decel popping.
Two bikes ago - Kawaski ZZR1200
Installed after market half system. Popped like crazy. Carburated bike so I had a jet kit professionally installed and dyno tuned. Minimal popping after that. Tuner said "they all pop a little on decel - just dont notice it with the stock baffles and cat".
One bike ago - 2006 Triumph Speed Triple 1050
Installed Leo Vince half system - popped excessively.
Dowloaded a Tuneboy dyno map - not available on TB site but created by Wayne at TB and the popping was completely gone. Just a smooth burble on decel.
This leads me to believe it is a fueling issue that can be corrected with the correct map for your set up.
I am not a tuner so I dont really know but my experince above tells me it makes sense. :?
gR3yWolf
Turbocharged
:cry: :cry: :cry:owl said:
PommieR3
Standard Bore
Thanks for the sounds Scotty, looks like the Tors are the go.
Owl, I'm thinking I like the raspy bark over meaty, louder sound.
Time to start saving :cry:
Owl, I'm thinking I like the raspy bark over meaty, louder sound.
Time to start saving :cry:
owl
Turbocharged
Always some to be found on e-bay, maybe save you a few bob.
If I may make a comment here about decel popping, it would be this; the phenomenom is chaotic.
Like a two-cycle engine idling or under light load, when there are combustion bi-products (exhaust) left in the cylinder, minimal fresh air, and a lean mixture, combustion doesn't occur regularly (it four, six or even eight cycles). In a 4 stroke with normal exhaust there is enough back pressure to insure that almost no fresh air gets into the cylinder from the exhaust system. If the mixture is lean to control emissions, combustion chamber temps are quite high and combustion occurs (requires high energy ignition system and in some cases like the R3 twin spark plugs), no popping is heard from the exhaust during decel.
On the other hand, when there is minimal back pressure exhaust scavaging is increased (A/F mixture goes even leaner). This reduces the chances of combustion, combustion chamber temps drop, air is pushed into the exhaust system by atmospheric pressure during the rarification wave that follows the compression wave generated by an exhuast valve opening, and air and fuel left in the cylinder from a misfire is pumped into the larger volume of the exhaust system. Some misfires in effect pump unburnt fuel and air into the exhaust system where it accumulates and mixes with residual exhaust gas and fresh air. Eventually when the A/F ratio in the exhaust system is correct it is ignited by another cylinder that has fired.
The A/F ratio in a carbureted motor goes much richer during decel than at a steady idle because the intake vacuum goes much higher. This reduces the chances of decel popping, but settings to reduce emissions increase the chances. Setting the mixture to run richer during decel will reduce the propensity for popping but may not entirely eliminate it. Different motors with their unique cam timing, port configurations and exhaust system lengths will behave differently. For example, a motor with short zoomies pops worse than a motor with a long exhaust system. Nothing physical is wrong with the motor, nor will it hurt the exhaust valves or any other part of the motor unless so much fuel and air accumulate that a single large explosion occurs which can blow your muffler off (Only saw this once in my life when water caused ignition misfiring, loaded the mufflers with fuel, and blew both mufflers off the pipes).
Hope this helps clear up some confusion.
Speed freak
Like a two-cycle engine idling or under light load, when there are combustion bi-products (exhaust) left in the cylinder, minimal fresh air, and a lean mixture, combustion doesn't occur regularly (it four, six or even eight cycles). In a 4 stroke with normal exhaust there is enough back pressure to insure that almost no fresh air gets into the cylinder from the exhaust system. If the mixture is lean to control emissions, combustion chamber temps are quite high and combustion occurs (requires high energy ignition system and in some cases like the R3 twin spark plugs), no popping is heard from the exhaust during decel.
On the other hand, when there is minimal back pressure exhaust scavaging is increased (A/F mixture goes even leaner). This reduces the chances of combustion, combustion chamber temps drop, air is pushed into the exhaust system by atmospheric pressure during the rarification wave that follows the compression wave generated by an exhuast valve opening, and air and fuel left in the cylinder from a misfire is pumped into the larger volume of the exhaust system. Some misfires in effect pump unburnt fuel and air into the exhaust system where it accumulates and mixes with residual exhaust gas and fresh air. Eventually when the A/F ratio in the exhaust system is correct it is ignited by another cylinder that has fired.
The A/F ratio in a carbureted motor goes much richer during decel than at a steady idle because the intake vacuum goes much higher. This reduces the chances of decel popping, but settings to reduce emissions increase the chances. Setting the mixture to run richer during decel will reduce the propensity for popping but may not entirely eliminate it. Different motors with their unique cam timing, port configurations and exhaust system lengths will behave differently. For example, a motor with short zoomies pops worse than a motor with a long exhaust system. Nothing physical is wrong with the motor, nor will it hurt the exhaust valves or any other part of the motor unless so much fuel and air accumulate that a single large explosion occurs which can blow your muffler off (Only saw this once in my life when water caused ignition misfiring, loaded the mufflers with fuel, and blew both mufflers off the pipes).
Hope this helps clear up some confusion.
Speed freak
owl
Turbocharged
That's some first post Speedy - thanks for that, and welcome to the forum.
Scotty
Supercharged
SPEEDFREEK
Are you saying that their is a possibility that if the Rocket had a three into three exhaust system, their is a good chance the popping might be history?
By the way.. Hello mate.
Are you saying that their is a possibility that if the Rocket had a three into three exhaust system, their is a good chance the popping might be history?
By the way.. Hello mate.
Trumps
.040 Over
Welcome Speedy I think I'll change my handle to Charlie Brown - all I read there was "blah blah blah" well done - a very intellectual introduction but way over my ignorant head my friend.
You are gonna love it here - more experts than you can shake a stick at, you will have some real interesting debates an Ill go "eh?".
You are gonna love it here - more experts than you can shake a stick at, you will have some real interesting debates an Ill go "eh?".
