Magneti Marelli throttle response issue
#1
Magneti Marelli throttle response issue
Looking to get some advice. I have a 2001 eletra glide classic with some throttle response issues...the idle is working ok after remapping the power commander but now it is while riding having some hesitation at 4000-5000 rpms while in gear. As if I loose power momentarily through certain rpms. Once you either let go of the throttle or give it some more, it goes away. Not sure where to start on this. Maybe crap in the injectors? Any advice appreciated. The bike was converted from 88 to 95 screaming eagle about 10k ago if that would matter.
#2
#4
Did you reset the zero and WOT throttle positions after remap? You could also examine the 4000 - 5000 RPM columns in the two map tables to see what differences there are in the values. I don't guess that you spend much time riding in that RPM range. Probably mostly on starting acceleration.
#6
#7
Looking to get some advice. I have a 2001 eletra glide classic with some throttle response issues...the idle is working ok after remapping the power commander but now it is while riding having some hesitation at 4000-5000 rpms while in gear. As if I loose power momentarily through certain rpms. Once you either let go of the throttle or give it some more, it goes away. Not sure where to start on this. Maybe crap in the injectors? Any advice appreciated. The bike was converted from 88 to 95 screaming eagle about 10k ago if that would matter.
Although we won’t delve into every aspect of how the ECM gathers and uses information, there have been two general ways EFI does its job, and Harley has used both methods. Through 2001, the Magneti-Marelli (MM) produced EFI is what’s called an Alpha-N based EFI. Throttle position and RPM determined the amount of fuel to deliver. Harley also added an intake air temperature (IAT) sensor within the throttle body to make adjustments to the fuel mixture. A problem with the sensor in the MM system was that the measured air temperature was not an accurate reading of what the intake temp really was. Relying on temperature close to a hot motor was not the best way to determine intake air temp. When the air enters the venturi of the throttle body, it speeds up, thereby changing its temperature. In addition, the throttle body sits right above the hot motor, compounding the problem of accurate air temperature measurement. Some of the problems reported with the MM EFI were hard starting, erratic idle, and difficulty in tuning. For performance motors, the dual-plenum throttle body, with independent runners feeding each cylinder, was too small to pass the required air into the engine. An advantage of throttle-based control is that there’s no dependence on intake-manifold pressure, which benefits motors with radical cams.
Here is the link for the full article: https://www.baggersmag.com/electroni...basics-h-d-efi
I know this isn't answering your question, but thought this info could be useful.
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LazySundays
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08-11-2018 07:08 PM