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Hacking up Honda's ECU
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PostPosted: Sat Mar 26, 2011 12:10 pm 
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Joined: Sun Aug 08, 2010 9:33 am
Posts: 10
Hi, I wish to know the formula to convert the hex value for the rev limits in to decimal so that I can adjust these. Such as in the map that i'm using. I have the vtec engage value of CF C7.

The wiki has the formula:
RPM(''x'') = 1875000/''x''
''x'' is a 16-bit RPM value
I dont think this is written right as if I knew x then what would be the point of the equation. Also does that mean RPM * 16 bit RPM? :?

1875000/''x'' = 1875000/CFC7 = 1875000/53191 = 35

The other equation in the wiki =
For 16-bit values, the actual value is Second Byte*256 + First Byte

C7 * 256 + CF = 199 * 256 + 207 = 51151

Any help would be much appreciated,

Thank you, Aaron


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