ECU's inter-changeable between models? - Honda RC51 Forum : RC51 Motorcycle Forums
 
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post #1 of 6 (permalink) Old 02-02-2012, 12:34 PM Thread Starter
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ECU's inter-changeable between models?

Hey RC bretheren - looking for ECU and don't want to pay thru the nose at dealer. I was informed that the ECU's between SP-1 and SP-2 are the same and inter-changeable, is this a true fact? If so, if anyone has a spare ECU they can part with, let me know.

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post #2 of 6 (permalink) Old 02-03-2012, 02:37 AM
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The SP2 ECM has a better 3D ignition/fuel map than the SP1. It also has the trigger pin for the radiator fans which the SP1's doesn't.
So no, the are not interchangeable. Although the bike will fire up with both of them, it won't be working properly.


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post #3 of 6 (permalink) Old 02-03-2012, 12:52 PM Thread Starter
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thanks for the reply and info - I inquired with another member who has an ECU for sale but it was from an SP-2 and he claimed they were swapable. Anybody else care to chime in on this subject?

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post #4 of 6 (permalink) Old 02-04-2012, 08:24 PM
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i believe makis is right, only reason to have SP2 ECU in an SP1 is if you are running SP2 throttle bodies, otherwise it won't run right. Not even sure if a PCIII would be able to set it right, i wouldn't think so.

Have you sent Ben at rc51parts.com a message? he may know, or better yet he probably has an SP1 ECU fairly cheap.

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post #5 of 6 (permalink) Old 02-05-2012, 05:45 AM
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If you check out my RC you will see what i am talking about.
https://www.rc51forums.com/forums/showthread.php?t=6033

I had SP2 throttle bodies and ECM installed. I've tried the SP1's ECM but apart that it cannot turn on the radiator fans, the bike is not working properly.
The main reason is that the 3D map in SP1's ECM is programmed for 57mm trottle bodies and 4 hole injectors.
Considering that the air's induction speed is the same as well as the fuel pump's pressure inside the injector's railing, the map triggers the injectors wrong because you have actually 62mm trottles and 12 hole injectors (SP2 kit) and you can easily damage the engine (mostly burn the valve's seat surface).


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post #6 of 6 (permalink) Old 02-05-2012, 02:17 PM Thread Starter
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Thanks for the info guys -appreciate it. I will contact Ben to see if has ECU......

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