EHC replacement

Energy One
W

Wayno

Member
KaptinAmerika said:
Big Dog is Back is not the original Big Dog in any way shape or form so I am not sure what your point is.
Click to expand...
Just showing that they post specifications and they still use the 32 amp system and last I knew the electrical is all the same on the new ones minus the ehc and besides harley style primary, jim’s , transmissions and 124s instead of 117s they are pretty much built with same components I see in their parts listing the voltage regulators work on the older original BDMs as well as the new models, I guess my point is exactly what I stated in my original post, the only way to fry an ehc from a voltage spike is by not having it fuse protected from the battery if the fuse pops all other electrical components such as hand controls or any other pc board will be protected also that’s all I’m getting at with my statement.
 
KaptinAmerika

KaptinAmerika

Guru
Wayno said:
Just showing that they post specifications and they still use the 32 amp system and last I knew the electrical is all the same on the new ones minus the ehc and besides harley style primary, jim’s , transmissions and 124s instead of 117s they are pretty much built with same components I see in their parts listing the voltage regulators work on the older original BDMs as well as the new models, I guess my point is exactly what I stated in my original post, the only way to fry an ehc from a voltage spike is by not having it fuse protected from the battery if the fuse pops all other electrical components such as hand controls or any other pc board will be protected also that’s all I’m getting at with my statement.
Click to expand...
Different electrical control system, different main wiring, different headlight, different speedometer, different starter not to mention all the components you listed above. Not even close to the original BDs.
Technically you can put just about any charging system in an original BD and it will "work" but there's more to it but that's a whole different discussion.

"the only way to fry an ehc from a voltage spike is by not having it fuse protected from the battery"

Fuses protect against Amperage overload
The only way to protect against a "voltage" spike, in terms of our BDs, is with a circuit that will protect against over voltage. BD EHCs have been getting bricked by over voltage in most cases. The over voltage is generally caused by the OEM VRs acting up momentarily. It affects more than just the EHC too. Any electrical component in the system is open to being damaged by this issue.
 
Axel

Axel

Active Member
Yes, they have implemented something like the P6KE24A and a polyfuse, what cost about 1,- and you get the parts from mouser.com . However, it´s a good product and it helps in some cases if your charge regulator "deliver" some high voltage spikes.
 
rodsoriano2000

rodsoriano2000

New Member
I just received the new EHC from Wild /Steed Works and the invoice shows "EHC 07-11 EFI version 2" and I have a 2005 Bulldog with a carburetor, are they compatible just want to know before I install and "Wild Steed is closed until 08/31/2020. Thanks in Advance for any info.
 
KaptinAmerika

KaptinAmerika

Guru
Hi Rod

I replied to your email also.
My apologies but for a brief period Electronik was contemplating two EHCs for EFI and Carb but has since backed away from that and is only producing the one EHC for both types. I have not had time to correct the descriptions in our system so I likely selected the wrong one when creating your invoice. The EHC you received is compatible with your 05.
And yes I have closed down phone support etc for a week. No I am not on another vacation.....lol. The work load has just gotten so great that I will be closing down for one week at the end of every two month period in an attempt to get caught back up.
 
Axel

Axel

Active Member
Hi guys,

It´s long time that I was in the forum due to much work here. I just want to give an update of the EHC:

I had a discussion with Curtis regarding the EFI bikes, cause there is still the challenge that the original EHC had divided the speed signal from the sensor to 1:7 . In my EHC I have made a bridge between the speed sensor and the EFI module. It works almost ok, but the result is, that the EFI get 7 times higher speed signals from my EHC compare to the original EHC. I just have made a speed divider and have send a few samples to Curtis today. You´ll find infos of the module at:

www.elektronikbox.de

Speed Divider - 44,03 € - Axel Joost Elektronik

Axel Joost Elektronik Speed Divider - Speed Divider Dieses Modul teilt das Geschwindigkeitssignal vom Radsensor oder Getriebesensor in einem einstellbaren Verhältnis von 1:2 bis 1:10 runter. Das Verhältnis wird im Modul gespeichert und kann vom Anwender jederzeit wieder geändert werden...
www.elektronikbox.de

I´ll offer the modules for EFI bike user for a lower price if the samples are working w/o issues. The modules are easy to implement in an EFI bike. You just need to cut the green cable from the EHC to the EFI controller, hang the module between EHC and EFI and connect it to plus and minus. That´s it.

For later EHC´s I´ll implement the 1:7 divider in the EHC and declare EHC-E if the samples are working.

All the best and always a safely ride!
Axel
 
Jwooky

Jwooky

Well-Known Member
Axel said:
Hi guys,

It´s long time that I was in the forum due to much work here. I just want to give an update of the EHC:

I had a discussion with Curtis regarding the EFI bikes, cause there is still the challenge that the original EHC had divided the speed signal from the sensor to 1:7 . In my EHC I have made a bridge between the speed sensor and the EFI module. It works almost ok, but the result is, that the EFI get 7 times higher speed signals from my EHC compare to the original EHC. I just have made a speed divider and have send a few samples to Curtis today. You´ll find infos of the module at:

www.elektronikbox.de

Speed Divider - 44,03 € - Axel Joost Elektronik

Axel Joost Elektronik Speed Divider - Speed Divider Dieses Modul teilt das Geschwindigkeitssignal vom Radsensor oder Getriebesensor in einem einstellbaren Verhältnis von 1:2 bis 1:10 runter. Das Verhältnis wird im Modul gespeichert und kann vom Anwender jederzeit wieder geändert werden...
www.elektronikbox.de

I´ll offer the modules for EFI bike user for a lower price if the samples are working w/o issues. The modules are easy to implement in an EFI bike. You just need to cut the green cable from the EHC to the EFI controller, hang the module between EHC and EFI and connect it to plus and minus. That´s it.

For later EHC´s I´ll implement the 1:7 divider in the EHC and declare EHC-E if the samples are working.

All the best and always a safely ride!
Axel
Click to expand...
So help me understand.

I always thought the speed pulses were a direct pass through to the EFI controller?

I have mine going direct now. And also direct to the Thunder heart controller.

Why would there be a multiplier?
Isn’t the only thing the EFI controller using the speed for is idle vs moving?
I notice a change in idle speed once I start rolling.
 
KaptinAmerika

KaptinAmerika

Guru
Jwooky said:
So help me understand.

I always thought the speed pulses were a direct pass through to the EFI controller?

I have mine going direct now. And also direct to the Thunder heart controller.

Why would there be a multiplier?
Isn’t the only thing the EFI controller using the speed for is idle vs moving?
I notice a change in idle speed once I start rolling.
Click to expand...
BD was dividing the Speed Sensor pulse by nine inside the EHC, according to S&S, and then passing it on to the S&S VFI module.
There is a divider because the raw speed sensor pulses are way too high for the VFI to use directly.
In most other EFI systems the calibration is pulled from the speedometer but BD decided to do it directly in the EHC.
If you have a non-OEM EHC controller and an unlocked VFI you can set the "Wheel Speed Gear Factor" in ProTune to 61.776, that is what we calculated based on working with a Bulldog Bagger here, to solve this issue. You can verify that number by following the procedure below and making the necessary adjustments to get it spot on if you prefer.
I know Axel states he is using 7 as the dividing factor.
I am receiving the first test unit tomorrow to verify.

Whel Speed Gear Factor.png
 
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