Found some more tables in 7747...

Bruce Plecan nacelp at bright.net
Fri Aug 21 01:12:12 GMT 1998


-----Original Message-----
From: Ross Myers <ponty at axis.jeack.com.au>
To: ECU List <diy_efi at efi332.eng.ohio-state.edu>
Date: Thursday, August 20, 1998 7:50 PM
Subject: Found some more tables in 7747...


>Since I've been on this list I've not seen anybody discussing the following
>addresses, so sorry If I'm repeating, but what do you all think.
>
>$107 - $145 , Base Coolant Spark Advance correction Vs Load.

How did you come up with this name?
>
>$107 = 10h , RPM Offset (16dec, what is this in RPM?).
>$108 = 40h , MAP Offset (64dec, what is this in kPa ?).
>$109 = 05h , 5 entry column width.

I've been working under the assumption it was map, rpm, column width...
>
>$10A - $10E , 3degF
>$10F - $113 , 25degF
>$114 - $118 , 46degF
>$119 - $11D , 68degF
>$11E - $122 , 90degF
>$123 - $127 , 111degF
>$128 - $12C , 132degF
>$12D - $131 , 154degF
>$132 - $136 , 176degF
>$137 - $13B , 197degF
>$13C - $140 , 219degF
>$141 - $145 , 241degF

How do these numbers work?.
>
>Anybody agree/disagree with me?.
>
>I got most of this info from the Buick V-6T bin which has a very similar
>table, only there is a 'bias' value for the whole table (addr $15F on the
>Buick) which is listed as 15 Deg.
>I have no clue for the 7747, or if it uses a 'bias' as well, anybody else?.
>
>Also, does anybody know where the fuel shutoff RPM value is in the 7747?
>
>Regards
>
>Ross Myers
>
Cheers
Bruce




More information about the Diy_efi mailing list