injectors and surging........again
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Tourer
Joined: Apr 2006
Posts: 329
Likes: 1
From: Maryland
injectors and surging........again
I know this has been covered, and recovered but here goes. I have the 25 degree injectors but in 1st at really low speed there is some very minor surging, does this just come with a v-twin or should it be smooth regardless of speed?
Road Master
Joined: Mar 2006
Posts: 1,187
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From: DFW
RE: injectors and surging........again
Can't help ya, but just know that you are not alone...
To clarify: I have a similar situation with my 06 Bob. Dunno if I'd call it 'surging', but thats as good a name as any. What happens is, at low speed, 1st and 2nd gear, if I try to hold a steady throttle & speed, it is more 'jerky' than steady. Not outrageous, but apparent. I assume it is a torque vs speed issue and to be expected when attempting to maintain a constant speed at low rpm. Dunno if this is what others have termed 'surging', but, if so, I too am experiencing it and this appears the appropriate thread to mention...
To clarify: I have a similar situation with my 06 Bob. Dunno if I'd call it 'surging', but thats as good a name as any. What happens is, at low speed, 1st and 2nd gear, if I try to hold a steady throttle & speed, it is more 'jerky' than steady. Not outrageous, but apparent. I assume it is a torque vs speed issue and to be expected when attempting to maintain a constant speed at low rpm. Dunno if this is what others have termed 'surging', but, if so, I too am experiencing it and this appears the appropriate thread to mention...
Road Captain
Joined: Nov 2005
Posts: 711
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From: Bothell, WA
RE: injectors and surging........again
It's called a big CC V-twin. Get used to it. HD's run like crap at low speed, so don't run it at low speed! That's why I avoid city traffic like the plague. You can try and tune it out, but the fact of the matter is, You need to get the engine rpm's up into the "sweet spot" were the pistons are going up and down fast enough to smooth out. Going slow requires feathering the clutch in and out and coasting alot.
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Tourer
Joined: Apr 2006
Posts: 329
Likes: 1
From: Maryland
RE: injectors and surging........again
That's what I wanted to know, figured that with only 2 jugs at a low rpm there were going to be some fluctuations in power. I can deal with it just as long as everyone is dealing with it. That's the new guy dilema, what's normal and what's not.
Thanks
Thanks
Road Master
Joined: Aug 2005
Posts: 906
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From: State College, PA
RE: injectors and surging........again
Harley Davidson says it is normal. I spent weeks at my dealer and they replaced everything
that could cause it with no help.
As near as I can tell it is the closed loop that causes the problem and a carbed model is not near
as bad. But you will find at about 2 to 3000 rpms at slow speed it will do it. Maybe someday HD
will improve the FI closed loop system and it will go away.
WilleC
Road Master
Joined: Jun 2006
Posts: 788
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From: the Vegas
RE: injectors and surging........again
you also have to remember a few things:
1) these are very short gears, especially now with the 6speed. the power transfer to the rear wheel is instant. at that ratio, the motor doesn't lug at all. try driving around in a M/T car in first gear at 5-10mph with your foot off the clutch............it aint that smooth. AND that is with modern tranny's and TOTAL engine management (fuel, valvetrain, intake, etc)
2) there is some degree of driveline slack. the small ups and downs in the road can seem to magnify this.
3) there is some slack in the throttle connections between the grip and.......the whole thing. again, this insn't a super sofisticated intake managment system that is as finely tuned as a car. the ON and OFF is not as "fine". plus, bumping (however small) at this transition point seems more drastic.
add all this together and it can seem pretty drastic. i rode a BMC hooligan hardtail a few years ago down Westhimer in Houston (not all that smooth) and i thought i was on a bucking horse trying to maintain 20-30 mph in traffic.
1) these are very short gears, especially now with the 6speed. the power transfer to the rear wheel is instant. at that ratio, the motor doesn't lug at all. try driving around in a M/T car in first gear at 5-10mph with your foot off the clutch............it aint that smooth. AND that is with modern tranny's and TOTAL engine management (fuel, valvetrain, intake, etc)
2) there is some degree of driveline slack. the small ups and downs in the road can seem to magnify this.
3) there is some slack in the throttle connections between the grip and.......the whole thing. again, this insn't a super sofisticated intake managment system that is as finely tuned as a car. the ON and OFF is not as "fine". plus, bumping (however small) at this transition point seems more drastic.
add all this together and it can seem pretty drastic. i rode a BMC hooligan hardtail a few years ago down Westhimer in Houston (not all that smooth) and i thought i was on a bucking horse trying to maintain 20-30 mph in traffic.
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