EHC replacement

[Jwooky]

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.

View attachment 86181

That’s great to know. Mine is unlocked so I can do so.

I’m just not clear on why the pulses were to many and what the impact will be.
Mine has been direct for a long time, and worried about the impact to the adaptive maps.
What does the EFI controller do with the speed signal?

 

[Ernie12]

Will these units work with the 2010 BD Bagger?

 

[jsousa515]

I have a Curtis ehc on my 09 wolf works perfectly


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[Th3InfamousI]

Will these units work with the 2010 BD Bagger?

Yep

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[Axel]

Hi Ernie12,

Yes, it should work. You just need to swap the metal frames of the 2 connectors against the frames from your old box. Big Dog had changed the connector frames and the harness connectors in the way, that the harness connector frames from late 2008 models appear outside of the EHC connector frames. I believe, that Big Dog had tried to get their EHC more waterproof and their intention was to keep the rinse water from the harness connectors outside of the EHC connector.

I hope you understand my cunfusing describtion ;-)

All the best!
Axel

 

[KaptinAmerika]

That’s great to know. Mine is unlocked so I can do so.

I’m just not clear on why the pulses were to many and what the impact will be.
Mine has been direct for a long time, and worried about the impact to the adaptive maps.
What does the EFI controller do with the speed signal?

The ECM only uses the speed signal for the idle/low speed hand off and mileage data.
All the other functions are independent of that signal so no worries about everything else.
Unless someone else knows of a situation I am not aware of, which is completely possible as I am no expert with the EFI system.
What you will likely see is an enormous total mileage reading in the ECM

 

[Jwooky]

The ECM only uses the speed signal for the idle/low speed hand off and mileage data.
All the other functions are independent of that signal so no worries about everything else.
Unless someone else knows of a situation I am not aware of, which is completely possible as I am no expert with the EFI system.
What you will likely see is an enormous total mileage reading in the ECM

My experience as well. I can definitely tell when it does the idle/low speed hand off. I see this I my EFI cars too.

I did not know the EFI controller keeps track of mileage. Wonder why.

 

[KaptinAmerika]

The ECM, unlocked versions, will let you keep track of several things.
Number of engine rebuilds, miles on each engine rebuild, info about the rebuilds, info about the engine setup etc.
I suspect it is mostly for folks using it on a racing bike but it can come in handy for a shop also.

 

[Axel]

Just an update: The first EHC for EFI bikes are ready. They have a 1:9 speed divider module integrated what take care for the correct speed signal in the EFI module itself. The new modules have now a paper sticker on the microcontroller what indicate that these modules are made for EFI bikes:



About the cost for the EFI-EHC: I believe that the EFI bikes are only about 10 % of all Big Dog models and I can take care for the additional work and parts for the divider if these EHC are only be used in EFI bikes. So, pls. don´t buy the EFI-EHC for the use in cabureted bikes. The EFI-EHC will work in cabureted bikes as well but the speed divider is not in use in a cabureted bike and the additional cost for me is useless in this case. I think, this is fair for everybody and it helps to keep the cost for the EHC at the same level w/o the need to increase the price in the future.

All the best!
Axel

 

[Axel]

A small update: I´m also affected from the worldwide chip shortage and can not deliver new EHC right now. The reason is, that the power chips for the EHC 58 and EHC 04 are available again in June 2022. I already have converted the pcb layout of the EHC 58 and EHC 04 to newer TI powerchips what should be available in April 2022 in order to reduce the time a bit. I never have expected before that a worldwide chip shortage could happen and I´m a bit frustrated with the time table of the chip fabs but I can only wait.

I have now made an adapter for the 2005+ Big Dog, what allow to implement any kind of control box in your bike without the need to rip off the original harness. The adapter have already all cross connections between the front and rear harness and have 22 solder pads for all in - and outputs. However, it´s not a perfect solution but it allow an easier implementation of a M-Unit, my B-Box , the Thunderheard module or any other controller in your bike until the new EHC are available in 2022. I attach a few pics.


I hope that 2022 is a bit more "back to normal" and wish to have a bit more time for riding. I wish you all a nice Christmas time

All the best!
Axel

 

[Rottweiler]

Thanks again Axel.
Hope you and yours have a merry Christmas.

 

[Axel]

Good news, I unexpected have got 2000 Chips from my distributor last week and I have finish 4 EHC58 with the new chips. I have made a test ride yesterday with a new EHC in my Ridgeback ( ...it was a bit uncomfortable due to the wintertime and wrong clothes ). However, everything is working fine. I was not sure if the new small chips can handle 18 Ampere for the starter solenoid and the deco valves, but they work w/o trouble, even with the cold engine. I´ll bring 4 EHC on the way to Curtis today for testing. I believe, that the new EHC 58 should be available in about 2 weeks if Curtis also have not found an issue.

I have overworked the EHC 04 pcb layout for the new chips and have ordered the 04 pcb boards. So, they should follow in about 3 weeks.

All the best!
Axel

 

[Axel]

Just for info: I have got a new batch of Chips a few weeks ago and already have delivered some EHC to Curtis and Josh. Unfortunately Curtis have discovered some new EHC 58 with a weak starter output what can not drive the starter and deco valves. I had tested the new EHC under 18 Ampere load on my tester in the workshop but not in my bike before. Now, I just have tested a new EHC in my Ridgeback this morning and have found out the same issue.

I still have some stronger chips on stock what can drive the starter outputs but I need to overwork the pcb boards for these chips.
I feel very sorry for the issue and will do my very best to overwork the EHC 58 boards asap. I know, the summertime is almost over and there is not much time anymore to ride the bike. I´ll do my very best to get the time as short as possible.

All the best!
Axel

 

[FXDWG]

Axel - thanks for the update. I have a question......I purchased an EHC-58 from Curtis last September and am holding it as a spare for the day mine fails. I have a new charging system as well and will replace that when I have time. My '06 K-9 has 195 original miles on it so I'm hoping it may be awhile before I need to replace the EHC, if ever. Can you please confirm whether the EHC I am holding is or is not affected by the the chip that cannot drive the starter and deco valves. Based on the timing you have indicated above it appears that it is not affected, but I would like to make sure. Thank you.

 

[Axel]

Hi FXDWG,

Thanks for your trust. Your box is not affected. The EHC 58 from July 2022 are affected.

All the best!
Axel

 

[FXDWG]

Hi FXDWG,

Thanks for your trust. Your box is not affected. The EHC 58 from July 2022 are affected.

All the best!
Axel

Thank you for the confirmation.....as I expected, but just wanted to make sure.

With the the several EHC replacements on the market, for some reason or another a fan base has developed with supporters strongly pulling for one particular unit over another. I'm not sure why, but I often see statements such as "The only one to use is .......". I guess it may be due to some type of marketing ploy or claim of expertise on the subject, or just sheer ignorance for that matter. I chose yours because of ease of installation and reputation for dependability - if it didn't perform up to standard we'd have heard about it by now. Thank you for developing your product to support our need.....on the other hand, I hope I'll never need to use it!

 

[1 B.M.F.]

I have two on an 04 and 05 and they work flawlessly. It took me 4 hours to install and one hour was just trying to hook up the damn horn wire. Very easy install. Axel is the way to go. Thank you Axel. And thank you Curtis, mr Wright. And some guy named KNOTHEAD, lol.

 

[Axel]

It´s already an endless story...

I have finish some EHC 58 with the new chip for the starter and have tested it in my Ridgeback w/o any problems. The new starter switch works pretty good. However, I got from Curtis a message yesterday that the new EHC need often 2-3 ignition key turns until the EHC switch on. I have checked it in my Ridgeback this morning but first had no similar issue. Then I have disconnected my led headlight and have hang a loose wired H4 halogen bulb in the line and I got the same effect, that it takes often 2-3 turns of the key switch to activate the main power. The inrush current of a 5 Ampere / 60 Watt halogen headlight is somewhere between 50 and 60 Ampere in the switch moment when the bulb is cold. Even the short overcurrent time force the 20 Ampere main switch to go in protection mode. So, the main switch is too weak for the high current of halogen bulbs when switching on and the last batch of EHC 58 is only usuable for led headlights...

I already have changed the pcb layout for a stronger available main chip and have ordered some pcb boards. Unfortunately, it will take another 2 weeks until I have the new EHC 58 available. I´m frustrated about it and hope that I get the new pcb boards asap. Sorry for the additional delay :-/ .

All the best!
Axel

 

[Pha_Q]

It´s already an endless story...

I have finish some EHC 58 with the new chip for the starter and have tested it in my Ridgeback w/o any problems. The new starter switch works pretty good. However, I got from Curtis a message yesterday that the new EHC need often 2-3 ignition key turns until the EHC switch on. I have checked it in my Ridgeback this morning but first had no similar issue. Then I have disconnected my led headlight and have hang a loose wired H4 halogen bulb in the line and I got the same effect, that it takes often 2-3 turns of the key switch to activate the main power. The inrush current of a 5 Ampere / 60 Watt halogen headlight is somewhere between 50 and 60 Ampere in the switch moment when the bulb is cold. Even the short overcurrent time force the 20 Ampere main switch to go in protection mode. So, the main switch is too weak for the high current of halogen bulbs when switching on and the last batch of EHC 58 is only usuable for led headlights...

I already have changed the pcb layout for a stronger available main chip and have ordered some pcb boards. Unfortunately, it will take another 2 weeks until I have the new EHC 58 available. I´m frustrated about it and hope that I get the new pcb boards asap. Sorry for the additional delay :-/ .

All the best!
Axel

How do I purchase one of these???

 

[Axel]

Hi Pha-Q,

Thanks for be interested. You can contact Curtis from Wild Steed or Josh from Ross Cycle. They both have these modules on stock. However, I should get the overworked pcb boards next Monday and I expect that I can deliver the new EHC58 to Curtis and Josh by the end of next week.

All the best!
Axel