[Gmecm] PCM-6 Turbo

Thu Nov 8 23:49:53 UTC 2012

this patch intercepts the normal MAP update routine. what it does is grab the A/D result for the MAP sensor, test the options bits to see if an "above 1BAR" sensor is selected, then if necessary, emulate the 1BAR MAP for all functions that rely on it. if a higher range MAP sensor isn't selected, the new stuff ends there.
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then a new values is created that i dubbed "kPa above 100", i did that to increase the resolution when dealing with the 2D lookup tables.
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that basically ends one part of the patch. next is the spark mod.
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option bits tested to see if above 1BAR MAP selected. if not, return to normal code. otherwise, the above 100kPa value is used in a 21 value?2D lookup table. the value from that table is subtracted from the current amount of spark advance and then returns to normal code.
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now the fuel patch starts.
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check if above 1BAR selected, if so proceed, if not, return. kPa above 100 value is called up for the 21 value 2D lookup table for fuel multiplication. value is looked up, then an 8 bit X 16 bit multiply is done to the BPW to multiply the BPW by up to 4 times it's normal value, depending on the value in the table. the value is then limit-checked and return to normal code.
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this is the end of the patch.
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a lot of this will need small tweaks to fit the later TBI code, but all of the difficult stuff is already done. assuming a decent hack already exists, you'll be changing something like 8 bytes compared to the work i already have outlined.
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this was all done for my conversion of A1 into nAst1 using a 16149396. won't work natively in a 7730/7727 due to them not having the extra SRAM that the 9396 has, but otherwise will. it's possible that the values could be moved around into the normal section of the RAM, but i didn't want to risk overwriting them with the stack.

--- On Thu, 11/8/12, Bill Hamilton <scoutii76 at hotmail.com> wrote:

From: Bill Hamilton <scoutii76 at hotmail.com>
Subject: Re: [Gmecm] PCM-6 Turbo
To: "gm ecm" <gmecm at diy-efi.org>
Date: Thursday, November 8, 2012, 1:58 PM

Robert,
Thanks for the offer.
I assume you are working with TP5 with the XDF/ADX files.
What ECM/PCM code are you working with.
Can you email me the patch?
Bill
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Date: Wed, 7 Nov 2012 18:00:18 -0800
From: robertisaar at yahoo.com
To: gmecm at diy-efi.org
Subject: Re: [Gmecm] PCM-6 Turbo

assuming nobody else has, i wouldn't mind sharing the patch i made for nAst1 to allow up to 3BAR support. you may have to do some digging to find where to apply the jump/return locations, but otherwise it's been bench-tested.
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the way i have it setup now, it accounts for fuel via a 2d table with 10kPa increments to 300kPa as a BPW mulitplier. for spark, i just have a basic "retard vs kPa" table that runs from 100 to 300kPa.

--- On Wed, 11/7/12, Bill Hamilton <scoutii76 at hotmail.com> wrote:

From: Bill Hamilton <scoutii76 at hotmail.com>
Subject: [Gmecm] PCM-6 Turbo
To: "gm ecm" <gmecm at diy-efi.org>
Date: Wednesday, November 7, 2012, 8:15 PM

Anyone played with the code for the PCM-6/7427/8625? etc... to allow 2 or 3 bar map for turbo application?
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I'm running the $0E with MPFI and the 4l80E but thinking of adding a turbo.
I've seen the WB code but haven't seen anyone mention turbo/supercharger addition.
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Thanks,
Bill USN-1

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