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Hacking up Honda's ECU
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 Post subject: timing calculation.
PostPosted: Wed Mar 05, 2003 4:29 am 
i was wondering how you calculated the timing? in other words hex to btdc.
any info would help, i did a search but couldn't find any thing, and you seem to be quite knoledge able. thanks

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 Post subject: Re: timing calculation.
PostPosted: Wed Mar 05, 2003 2:48 pm 
first convert the hex to decimal. then use this formula:

ignition = ((x-15) * .36) where x = decimal equivilent of hex value

Mike


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 Post subject: Re: timing calculation.
PostPosted: Wed Mar 05, 2003 6:28 pm 
thanks allot mike!

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 Post subject: Re: timing calculation.
PostPosted: Wed Mar 05, 2003 9:17 pm 
sorry to be a pest man, but i cant figure out how to calculate stock revlimiters. i can calculate custom ones but i cant figure out stock ones.

costomRevLimiter = 1920000 / revLimit

but i cant figure out

revLimiter = ????????

thanks man

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 Post subject: Re: timing calculation.
PostPosted: Thu Mar 06, 2003 1:49 pm 
hex = (1920000 / RPM) - multiplier

So... If you want a 3200 RPM limit, 192000 / 3200 = 600

600 - 512 (which is the 02 multiplier 256 + 256) = 88

88 in hex = 58

02 as multipler, and 58 as databit.. == 3200 RPM limit.. and so on.

Thanks to Mike for information..


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 Post subject: Re: timing calculation.
PostPosted: Thu Mar 06, 2003 4:24 pm 
if i had a program with the revlimit already changed, how can i figure out what it's changed to?

for instance. take a stock rom get the high and low bit then concatinate them: 01 + 03 = 1030. where would i go from there? i would just like to see what some of the revlimits are in some roms of mine. and it would just be nice to know.

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