How the 4A-GE ECU works

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How the 4A-GE ECU works

01-12-2006, 12:12 PM

Post: #19

firehawk Offline

Senior Member

Posts: 281
Joined: Jun 2005
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On the ignition map, how does the 8-bit value correspond to actual ignition advance in degrees? Is it simple 0.8 fixed-point arithmetic, ie. the advance = max_advance*(cell_value/255)? If this is the case, have you determined what's the maximum advance in degrees (excluding the advance set mechanically from the distributor)?

Edit: man, I should refresh the browser window to see if there has been any more replies since I opened the thread. Big Grin

You might also be interested in this;

http://www.r5r.net/gallery/album14

It's the TRD Group-A ECU used in circuit racing and rallying in the 80s and we're currently running our AE82 race car with the unit shown in the pictures. It's been build "on top" of the standard ECU similarly as we've discussed here. The piggyback board appears to have, in addition to some standard logic chips, an unknown Nippon Denso CPU (151801-1230? MC6800 clone?), a Hitachi HD46821 PIA (MC6820 clone) and two EPROMs (one marked 001, the other "RALLY4" "84.11.9" "E8" "5985"). I've been itching to dump out the contents of the socketed EPROM to see what I could find in there but my teammate doesn't want me to break our precious ECU. Wink

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Messages In This Thread

How the 4A-GE ECU works - JMR_AW11 - 01-10-2006, 09:52 PM

[] - alimonos - 01-10-2006, 10:31 PM

[] - firehawk - 01-10-2006, 10:53 PM

[] - banpei - 01-10-2006, 11:12 PM

[] - JMR_AW11 - 01-10-2006, 11:19 PM

[] - ZaX - 01-11-2006, 10:38 AM

[] - NoHachi - 01-11-2006, 10:50 AM

[] - dreja - 01-11-2006, 11:34 AM

[] - gon - 01-11-2006, 12:31 PM

[] - alimonos - 01-11-2006, 12:50 PM

[] - Ivan141 - 01-11-2006, 12:50 PM

[] - irishtwincam - 01-11-2006, 02:07 PM

[] - JMR_AW11 - 01-11-2006, 02:37 PM

[] - JMR_AW11 - 01-11-2006, 02:47 PM

[] - JMR_AW11 - 01-11-2006, 02:58 PM

[] - phatBob - 01-12-2006, 01:39 AM

[] - JMR_AW11 - 01-12-2006, 10:57 AM

[] - NoHachi - 01-12-2006, 11:13 AM

[] - firehawk - 01-12-2006 12:12 PM

[] - JMR_AW11 - 01-12-2006, 02:34 PM

[] - dAYTONA - 01-12-2006, 06:51 PM

[] - Denmark - 01-12-2006, 11:55 PM

[] - JMR_AW11 - 01-13-2006, 01:02 AM

[] - JMR_AW11 - 01-13-2006, 01:10 AM

[] - alimonos - 01-13-2006, 10:38 AM

[] - JMR_AW11 - 01-13-2006, 10:52 AM

[] - firehawk - 01-13-2006, 01:24 PM

[] - JonT - 01-13-2006, 01:46 PM

[] - Denmark - 01-13-2006, 10:37 PM

[] - phatBob - 01-14-2006, 01:08 AM

[] - JMR_AW11 - 01-17-2006, 01:21 AM

[] - JMR_AW11 - 01-17-2006, 01:26 AM

[] - NoHachi - 01-17-2006, 01:37 AM

[] - JMR_AW11 - 01-17-2006, 03:04 PM

[] - Denmark - 01-17-2006, 04:23 PM

[] - alimonos - 01-18-2006, 02:19 AM

[] - phatBob - 01-19-2006, 01:20 AM

AE86 ECU software - irishtwincam - 01-19-2006, 04:23 PM

[] - El_Camino - 05-21-2006, 10:59 AM

[] - cannabolic - 05-26-2006, 09:50 AM

[] - np303 - 12-05-2006, 07:46 PM

[] - SuperHessu - 12-06-2006, 12:16 PM

[] - NoHachi - 12-06-2006, 12:58 PM

[] - SuperHessu - 12-06-2006, 01:35 PM

[] - banpei - 12-06-2006, 06:45 PM

[] - Ivan141 - 12-06-2006, 07:35 PM

[] - irishtwincam - 12-06-2006, 09:44 PM

[] - banpei - 12-07-2006, 10:43 AM

[] - alimonos - 12-07-2006, 11:02 AM

[] - Bad_Dog - 12-07-2006, 11:13 AM

[] - firehawk - 12-07-2006, 01:44 PM

[] - Bad_Dog - 12-07-2006, 02:20 PM

Greetings from the States - Red - 12-07-2006, 07:35 PM

Re: Greetings from the States - JMR_AW11 - 12-26-2006, 01:39 PM

[] - JMR_AW11 - 12-26-2006, 02:46 PM

[] - Harvey - 12-26-2006, 08:52 PM

[] - Red - 12-26-2006, 08:57 PM

[] - JMR_AW11 - 12-27-2006, 12:14 AM

[] - Red - 12-27-2006, 12:33 AM

[] - JMR_AW11 - 12-27-2006, 12:34 AM

[] - Harvey - 12-27-2006, 01:14 AM

[] - np303 - 02-25-2007, 05:43 AM

[] - domi - 02-25-2007, 06:46 AM

[] - firehawk - 02-25-2007, 09:13 PM

[] - domi - 02-25-2007, 10:31 PM

[] - jamiemirror - 02-25-2007, 11:07 PM

[] - firehawk - 02-26-2007, 09:47 AM

[] - domi - 02-26-2007, 11:16 AM

[] - JMR_AW11 - 02-28-2007, 09:32 PM

[] - domi - 03-03-2007, 09:10 AM

[] - Toyota T23 - 03-04-2007, 12:22 AM

[] - Toyota T23 - 03-09-2007, 01:50 AM

[] - JMR_AW11 - 03-09-2007, 08:43 PM

[] - Toyota T23 - 03-10-2007, 01:35 AM

[] - Red - 03-11-2007, 03:48 AM

Question About ECU - CHACAMAN - 03-26-2007, 01:43 PM

[] - domi - 03-27-2007, 07:48 AM

little black box - thanhngo - 07-26-2007, 03:41 PM

ECU - stefanj2k - 07-27-2008, 07:46 PM

[] - banpei - 07-27-2008, 10:56 PM

[] - stefanj2k - 07-30-2008, 09:29 PM

[] - XJS - 07-30-2008, 10:31 PM

[] - banpei - 07-31-2008, 11:58 AM

[] - stefanj2k - 08-15-2008, 05:05 PM

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