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 Originally Posted by bumper60651
Since I changed the muffler on my  I'm hearing that I should change the "mapping" too. I don't know what that is since I didn't purchase a juice box. Is this something that is required when you change out a muffler? The seems to run okay, in fact it runs like a striped a-- ape! Has a whole lot more power than with the stock muffler, or maybe it's the sound I'm reacting to, but it sure seems faster.
Mapping refers to changing the program on the machines ECU (electronic control unit)
Back in the day when bikes had carbs and point and condenser ignition, after a performance pipe was installed, it was possible that the carb jetting and or timing needed to be adjusted. Now, it is a matter of changing the program in the ECU.
If the bike is running good, I would not personally worry about it. I have the hindle pipe and no juice box. my bike runs good.
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Very Active Member
I am new to the Spyder but, usually you wont need a Juice Box unless you have upgraded the exhaust and air (both). The reason is as you increase your exhaust to a less restrictive and free flowing exhaust (aftermarket) and you upgrade the air box to try and get more air flow (colder air is best) you would be increasing horsepower and TQ due to both of these. If you dont advance the timing and or fuel ratios with the bike you could get detonation. Sometimes heard as a decel pop when letting off the gas. This is caused by leaning your mixture out. The fuel has stayed the same while you have increased airflow to the intake and reduced restrictions and backpressure on the exhaust. Hope this makes since. You should be fine with just moding only one. If your not getting any decel pop and at the next spark plug change look at them and see what they look like. Some have stated that you cant tell how your plugs/engine is running by looking at the plugs but I always have. If they come out white then its running lean. If they are real black then its running rich. You would rather run rich than lean. Lean can damage the engine.
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Very Active Member
My RT with a Two-Bros pipe had decel popping (& low speed surging) before I changed to an aftermarket air filter. The JB pretty much fixed the problems, but, If I didnt have the problem, I sure wouldnt add either the JB or filter.
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Very Active Member
Mapping for dummies like me
In a sense, mapping refers to the fuel map (think of a road map) which the ECU follows to delivery the required amount of fuel for the given RPM and load conditions. The map itself is a spreadsheet which the ECU 'reads.' A different map will specify a different fuel amount at the same RPM and load condition. Maps are written by someone using a dynomometer to load the engine while using exhaust analisys to determine optimum fueling (air/fuel ratio) for every increment in speed and load (throttle position). Different maps are needed where changes from stock are made to intake and/or exhaust systems (or altitude if you want to be particular) because they affect the amount of air passing through the combustion chamber. So if you have more air passing through by fitting an air filter and/or exhaust system with lower restriction, you need to have more fuel injected so as to maintain the "optimum" air/fuel ratio of 14:1 (by weight). If you don't increase the amount of fuel it can cause a lean mixture (> 14:1) which burns hotter (for chemical reaction reasons) which may cause damage to metal components within the combustion chamber eg, exhaust valves, piston crowns and/or spark plugs.
Well, that's my understanding of the topic.  Feel welcome to correct me.
Last edited by Freddy; 04-17-2011 at 09:22 AM.
The best substitute for brains & knowledge is....................silence.
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Installed Evoluzione o2 modifier over 2 years ago. Took care of occasional acceleration issues was experiencing.
Over the years seems my spyder does not like "summer" gasoline. Fuel reformulation summer months to reduce smog? Can tell each year when stations start using summer fuel spyder runs slightly rougher. Smoothes out in fall. (Spyder also runs smooth on fuel in gas containers filled prior to summer.
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Alignment Specialist
I have the green filter, hindle, and JB on my RS.
At first, I had the JB numbers very high...however, with each update, I've had to lower the numbers as BRP has made the bike run richer with each update...it's actually quite noticeable.
Before I'd turn the JB settings down a bit, I'd get popping when coasting and then hitting the throttle...the mix was too rich.
After fiddling with the JB a little and reducing the fuel to mix, the problem has almost completely corrected itself.
Oh, with the 3 mods, the bike is much quicker...no question about it...
Bone Crusher 
If you work to make money, you'll never be happy, as there's never enough money...if you work to take good care of people, the money will always be there....Sean O'Connell, 1999
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Very Active Member
...and here's a map...
...for a 3 cylinder Triumph.
This view (just one of several tabs at top) shows the air/fuel ratio at given RPM and throttle position opening %. Note that there are none above 14.7 - where lean burning begins. These ratios are set by the numbers the cells in the F1 F2 & F3 fuel (volume) tables. Those volume numbers are the ones the dyno operator enters for that bike with a specific intake filter and exhaust system. Reducing restriction allows more air in but the fuel volume delivery of the map in the ECU stays the same, therefore the air/fuel ratio will no longer be as calculated/shown below and increases into unknown lean numbers. Follow?
The best substitute for brains & knowledge is....................silence.
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Very Active Member
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On going mods.. 
have fun and ride like the wind.
