ThunderMax for 99-01 Magneti Marelli EFI
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Road Master
Joined: Jul 2010
Posts: 1,065
Likes: 68
From: Hawaii
ThunderMax for 99-01 Magneti Marelli EFI
Has anyone replaced their M&M ECM with one of these?
http://shop.thunder-max.com/shopexd.asp?id=288&bc=no
I have a hesitation if I crack the throttle too fast from bout 2000-2200 rpms but not if I move the throttle more slowly. Otherwise runs great and accelerates well in all ranges. I am waiting for a fuel filter, pump and lines. Bike has 58k and 20k since top end upgrades and dyno tune.
http://shop.thunder-max.com/shopexd.asp?id=288&bc=no
I have a hesitation if I crack the throttle too fast from bout 2000-2200 rpms but not if I move the throttle more slowly. Otherwise runs great and accelerates well in all ranges. I am waiting for a fuel filter, pump and lines. Bike has 58k and 20k since top end upgrades and dyno tune.
Last edited by DAVENRINO; Jan 22, 2018 at 02:41 PM.
Seasoned HDF Member
Joined: Feb 2007
Posts: 6,085
Likes: 1,128
From:
Could the hesitation be fuel related?
Maybe something really simple like a piece of tank liner coming loose and resting on fuel sock filter causing fuel starvation at quick opening of throttle.
When you move the throttle slowly the slow movement allows time for flow to be maintained.
I will guess the symptom is new, was not present before upgrades and did not start after any upgrades and all gaskets around throttle body are good.
Maybe something really simple like a piece of tank liner coming loose and resting on fuel sock filter causing fuel starvation at quick opening of throttle.
When you move the throttle slowly the slow movement allows time for flow to be maintained.
I will guess the symptom is new, was not present before upgrades and did not start after any upgrades and all gaskets around throttle body are good.
Thread Starter
|
Road Master
Joined: Jul 2010
Posts: 1,065
Likes: 68
From: Hawaii
Could the hesitation be fuel related?
Maybe something really simple like a piece of tank liner coming loose and resting on fuel sock filter causing fuel starvation at quick opening of throttle.
When you move the throttle slowly the slow movement allows time for flow to be maintained.
I will guess the symptom is new, was not present before upgrades and did not start after any upgrades and all gaskets around throttle body are good.
Maybe something really simple like a piece of tank liner coming loose and resting on fuel sock filter causing fuel starvation at quick opening of throttle.
When you move the throttle slowly the slow movement allows time for flow to be maintained.
I will guess the symptom is new, was not present before upgrades and did not start after any upgrades and all gaskets around throttle body are good.
Seasoned HDF Member
Joined: Oct 2007
Posts: 8,852
Likes: 2,493
From: Decatur, Alabama
All you need is to readjust your throttle position sensor. Your bike is running a little lean. It's a common problem with Fuel injected EVOs. Mine did that. I fattened it up and no more problems. Didn't cost a dime. There is a method on a youtube video on how to do it.
carl
carl
Thread Starter
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Road Master
Joined: Jul 2010
Posts: 1,065
Likes: 68
From: Hawaii
All you need is to readjust your throttle position sensor. Your bike is running a little lean. It's a common problem with Fuel injected EVOs. Mine did that. I fattened it up and no more problems. Didn't cost a dime. There is a method on a youtube video on how to do it.
carl
carl
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Road Master
Joined: Jul 2010
Posts: 1,065
Likes: 68
From: Hawaii
I bought the Fuel Pump Factory pump and it looked exactly like the one I took out including the filter sock. The Drag Specialties fuel filter also looked identical to stock and I used their pressure line to the check valve. Just got it done last night and the bike is running MUCH better in all ranges. There is still a slight hesitation sometimes with a quick throttle twist at 2000 rpms but barely noticeable. I am still going to try adjusting the TPS.
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No - I upgraded to Delphi closed loop.
Don't follow any of the base TP settings for EVOs - they were much fatter than TC88 like .275v.
There were also mis-prints in early literature. A good base TP setting for Twin cam like yours would be .195v
Don't follow any of the base TP settings for EVOs - they were much fatter than TC88 like .275v.
There were also mis-prints in early literature. A good base TP setting for Twin cam like yours would be .195v
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6th Gear
Joined: May 2020
Posts: 14
Likes: 1
From: Los Angeles
Has anyone replaced their M&M ECM with one of these?
http://shop.thunder-max.com/shopexd.asp?id=288&bc=no
I have a hesitation if I crack the throttle too fast from bout 2000-2200 rpms but not if I move the throttle more slowly. Otherwise runs great and accelerates well in all ranges. I am waiting for a fuel filter, pump and lines. Bike has 58k and 20k since top end upgrades and dyno tune.
http://shop.thunder-max.com/shopexd.asp?id=288&bc=no
I have a hesitation if I crack the throttle too fast from bout 2000-2200 rpms but not if I move the throttle more slowly. Otherwise runs great and accelerates well in all ranges. I am waiting for a fuel filter, pump and lines. Bike has 58k and 20k since top end upgrades and dyno tune.
Seasoned HDF Member
Joined: Feb 2007
Posts: 6,085
Likes: 1,128
From:
If you are seeking assistance perhaps consider starting a new post.
Provide year, model, miles and any change from stock factory delivered.
Include when it last drove OK and when problem started.
A little history of ownership helps too.
We can not see bike so the more you describe the easier it is to understand and possibly provide a route of diagnosis or a resolution.