Posted by Bart on March 30, 2008, 2:05 pm
> On Sun, 30 Mar 2008 08:22:15 -0700 (PDT), oasysco
>>With EFI and an external FI manager, it becomes real simple.
>>
.
> With the newer Harleys they've gone to a closed-loop system. That
> makes swapping exhausts less finicky, since there are oxygen sensors
> inside, giving the system feedback to adjust to the change. I like
> that.
> For the (older) open-loop system Road Glide, going to free-er flowing
> exhaust pretty much requires remapping the ECM.
So if I change the stock mufflers on my '08 FXD I would not need a re-map?
Bart
Posted by oasysco on March 30, 2008, 2:18 pm
> > On Sun, 30 Mar 2008 08:22:15 -0700 (PDT), oasysco
> >>With EFI and an external FI manager, it becomes real simple.
> .
> > With the newer Harleys they've gone to a closed-loop system. That
> > makes swapping exhausts less finicky, since there are oxygen sensors
> > inside, giving the system feedback to adjust to the change. I like
> > that.
> > For the (older) open-loop system Road Glide, going to free-er flowing
> > exhaust pretty much requires remapping the ECM.
> So if I change the stock mufflers on my '08 FXD I would not need a re-map?
Doesn't Harley mtc include that service? and isn't there ECM
remappable? Unlike honda...
Greg
> Bart
Posted by Road Glidin' Don on March 30, 2008, 3:21 pm
On Sun, 30 Mar 2008 11:18:33 -0700 (PDT), oasysco
>>
>> > On Sun, 30 Mar 2008 08:22:15 -0700 (PDT), oasysco
>>
>> >>With EFI and an external FI manager, it becomes real simple.
>>
>> .
>> > With the newer Harleys they've gone to a closed-loop system. That
>> > makes swapping exhausts less finicky, since there are oxygen sensors
>> > inside, giving the system feedback to adjust to the change. I like
>> > that.
>>
>> > For the (older) open-loop system Road Glide, going to free-er flowing
>> > exhaust pretty much requires remapping the ECM.
>>
>> So if I change the stock mufflers on my '08 FXD I would not need a re-map?
>Doesn't Harley mtc include that service? and isn't there ECM
>remappable? Unlike honda...
The ECM is remappable but that's definitely not part of any service
plan.
Posted by Calgary on March 30, 2008, 3:19 pm
>> On Sun, 30 Mar 2008 08:22:15 -0700 (PDT), oasysco
>>
>>>With EFI and an external FI manager, it becomes real simple.
>>>
>.
>> With the newer Harleys they've gone to a closed-loop system. That
>> makes swapping exhausts less finicky, since there are oxygen sensors
>> inside, giving the system feedback to adjust to the change. I like
>> that.
>>
>> For the (older) open-loop system Road Glide, going to free-er flowing
>> exhaust pretty much requires remapping the ECM.
>>
>So if I change the stock mufflers on my '08 FXD I would not need a re-map?
>Bart
Newer HD's are set up to run lean right out of the factory. Anything
you might do to the fuel air ratio, such as swapping the mufflers,
could make it run even leaner, which is not a good thing.
Granted a muffler change will have less effect than adding a free flow
air filter, but it might still create a lean condition.
If you are going to swap the mufflers, why not improve things on the
intake side and remap the ECM at the same time, and add a few more HP
in the process.
--
See Ya On The Road
2000 Yamaha Venture Millennium
2004 HD Road King
Posted by Bart on March 30, 2008, 6:25 pm
>>
>>> On Sun, 30 Mar 2008 08:22:15 -0700 (PDT), oasysco
>>>
>>>>With EFI and an external FI manager, it becomes real simple.
>>>>
>>.
>>> With the newer Harleys they've gone to a closed-loop system. That
>>> makes swapping exhausts less finicky, since there are oxygen sensors
>>>
>>> For the (older) open-loop system Road Glide, going to free-er flowing
>>> exhaust pretty much requires remapping the ECM.
>>>
>>
>>So if I change the stock mufflers on my '08 FXD I would not need a
>>re-map?
>>
> Newer HD's are set up to run lean right out of the factory. Anything
> you might do to the fuel air ratio, such as swapping the mufflers,
> could make it run even leaner, which is not a good thing.
> Granted a muffler change will have less effect than adding a free flow
> air filter, but it might still create a lean condition.
OK, that was my understanding from some discussion with one of the techs at
my local darler shop.
> If you are going to swap the mufflers, why not improve things on the
> intake side and remap the ECM at the same time, and add a few more HP
> in the process.
Makes sense to me!
Bart
'08 FXD (broken)
XML Sitemap
>>With EFI and an external FI manager, it becomes real simple.
>>
.
> With the newer Harleys they've gone to a closed-loop system. That
> makes swapping exhausts less finicky, since there are oxygen sensors
> inside, giving the system feedback to adjust to the change. I like
> that.
> For the (older) open-loop system Road Glide, going to free-er flowing
> exhaust pretty much requires remapping the ECM.