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[CaliforniaMatt]

Hi Guys,

I have read twice now in American Iron magazine that when doing exhaust/air cleaner mods on bikes '08 or newer, there is not a strong requirement for a fuel adjust computer (V&H Fuel Pack etc). They indicate the computers on the new bikes can be taught to accomodate the new equipment after about 15min of driving. I wasnt looking for performance as much as I was a more "robust" sound...if thats the case, is this a solid recommendation?

Looking for the feedback...thanks!

[Hoist!]

Hi Guys,

I have read twice now in American Iron magazine that when doing exhaust/air cleaner mods on bikes '08 or newer, there is not a strong requirement for a fuel adjust computer (V&H Fuel Pack etc). They indicate the computers on the new bikes can be taught to accomodate the new equipment after about 15min of driving. I wasnt looking for performance as much as I was a more "robust" sound...if thats the case, is this a solid recommendation?

Looking for the feedback...thanks!

That's true while it's in the NB closed-loop mode. But it's not there all the time. Only a certain RPM's. And even if it were across the whole RPM range, the stock ECM program sucks. Gotta fix the AFR and timing no matter what. I'd tune my motor even if I were leaving it bone stock!

Hoist!

[Talon]

The closed loop system is always trying to get back to that 14.7:1, to satisfy the EPA standards, which in most cases is too lean. So while it may learn you new equipment, it's always checking, "can I go back to 14.7:1?", So it really trying to lean out the bike all the time, causing higher heat levels than should really be run. The AFR should be in the 13.5-13.0:1, for most riding and lower heat levels. So even without adding pipes and AC, you should really get a remap, or different, tunable ECU.

[Hoist!]

The closed loop system is always trying to get back to that 14.7:1, to satisfy the EPA standards, which in most cases is too lean. So while it may learn you new equipment, it's always checking, "can I go back to 14.7:1?", So it really trying to lean out the bike all the time, causing higher heat levels than should really be run. The AFR should be in the 13.5-13.0:1, for most riding and lower heat levels. So even without adding pipes and AC, you should really get a remap, or different, tunable ECU.

How do I beat you to these when you have nothing better to do Craig?

Hoist!

[hd-dude]

The closed loop system is always trying to get back to that 14.7:1, to satisfy the EPA standards, which in most cases is too lean. So while it may learn you new equipment, it's always checking, "can I go back to 14.7:1?", So it really trying to lean out the bike all the time, causing higher heat levels than should really be run. The AFR should be in the 13.5-13.0:1, for most riding and lower heat levels. So even without adding pipes and AC, you should really get a remap, or different, tunable ECU.

True, and also the closed loop systems on the HD's are narrow band and only adjust to 14.7. They are only in the closed loop mode at idle and cruise (part throttle) ranges. This means that during accelleration the system is in open loop mode and relies on the base map in the ECU which will result in a VERY lean condition witha free flowing exhaust and intake.

PS: Matt, give me a call.......