I don't see any mention of the Manifold Absolute Pressure (MAP) sensor here. As I understand EFI theory increased air flow results in a change in the MAP and a proportionately greater ON time for the fuel injector; i.e it does "change the amount of fuel".
I would be researching EFI theory although carburetion theory is very helpful in understanding Electronic Fuel Injection since EFI is designed to mimic every good aspect of the technology that it replaces.
Never heard that one before. I'd think you'd need a forced induction system to increase the preassure in the manifold to the point that the ecu would adjust it. In any case, the amount of adjustment the ecu can make for this sensor (which as you probably know is intended to compensate for changes in altitude) is not enough to compensate for intake/engine/exhaust changes, otherwise DynoJet et al would be out of business.
I realize that this bike is fuel injected, but like you said, the principals are the same, and there is a lot more out there on carburetion.
Quick!!! You better spread this info to all of the major OEMs specifically HD that offer "performance" slip-ons and exhaust systems and use as a sales tool "no rejetting or re-mapping required". Just teasin'! Now specifically to your point...we need both fuel and air - the "mix". The amount of air that gets mixed with the fuel is way more dependant on it's path (and the restrictions therein) to the cylinder head than the restrictions on its way out. And it goes without saying you should NEVER make an exhaust change without closely following up to see if all is still good regarding the mix. Likewise, you should NEVER just automatically fatten things up without, again, checking to see that all is good with the mix. I didn't respond (at least I didn't mean to) in absolutes because there are so many variables out there in types and styles of systems, variations in manufacturer specs, and so on. What I will claim as MY absolute is that in MY experience, simply installing better performing & better sounding mufflers or exhaust systems on motorcyles and doing NOTHING to the OEM intake has never caused a lean condition. Never.
Teasing aside, HD and all the other manufaturers offer an IMPLIED WARRANTY when they make these statements, because if the product doesn't do what they say, they are liable. When manufacturers make these claims, you can be fairly certain that they've done extensive testing to ensure their products aren't going to cause problems. Back to my original point, and no disrespect to S&S, but are they offering a warranty to everyone who mods their bike like S&S did? Don't think so. So in this case, and I think we agree here, if you make changes to your bike, you should know and understand their effects.
I still disagree with you on your air path theories. Modifying the engine, and or the exhaust, can change the amount of air flowing through the engine IF they are the restrictive part of the path. More air = leaner mix. Period.
I do agree that in most cases, changing the exhaust and leaving the stock intake will probably not dramatically affect anything mix wise. Stock airboxes are fairly restrictive. However, I still believe that, in the absense of a manufacturers implied warranty, you should know what you are doing to your bike.
With regards to the Fuel Management system, I'm stuck with the California emissions fixed fuel management system (ARB) non adjustable. Now CobraUSA recommends the FI2000R for their pipes (ARB) for California models. With that said, I have reservations with another fixed setting. They want $200.00 bucks for the Fuel Management module that cannot be adjusted. I have to see what the effects are by adding the reaper exhaust tips.
I need an address out of state to get the adjustable one...
Thanks for the feedback
Dude, I think someone at CARB just scared a vendor or somehting here. As far as I know, It's not illegal to sell non CARB compliant devices in our state, it's just illegal to use them on anything besides off road, closed course competition vehicles. As soon as the 49 state models are more widely available, I'm sure you'll be able to get one from one of the bigger vendors. That's my plan anyway. For my Fury race bike, of course
