Initial Ignition Timing Post Start

lach01 · **Posted:** Fri Feb 14, 2014 8:39 pm

td-d wrote:

lach01, I think this is it, you'll need to test it:

Code:

ROM:00084B3C Table_Ignition_Timing_Post_Start:.data.w h'10 ; DATA XREF: sub_364A2+336o
ROM:00084B3C                                         ; sub_36834+1Co ...
ROM:00084B3E                 .data.w h'400
ROM:00084B40                 .data.l h'CAA4C
ROM:00084B44                 .data.l byte_CAACC      ; = 2.852
ROM:00084B48                 .float 0.3515625
ROM:00084B4C                 .float -20.0

Awesome, thanks. My programming has always been very basic and quite outdated so if anyone can help me out with getting it into romraider it would be much appreciated.

Thanks,
Lachie.

MFB · **Posted:** Wed Jun 11, 2014 10:06 pm

I found this thread via google when looking for too much regard upon start up causing noise on catless systems. :-)

May I have address for AZ1G101N? Thanks mate

MFB · **Posted:** Wed Jun 11, 2014 10:29 pm

Try using -5 degrees , that was applied in a recent update for the 86/Brz from Avo
---
1. Startup ignition retard - the default value for startup is -15 degrees. This is instituted by the manufacturer for emission reasons only, and only affects that initial cold startup. It is also rather excessive and makes a car that has had it's cats removed sound like it has an exhaust leak at startup. We have reduced it to -5 degrees only to reduce that nasty startup noise.

aksubiedubie · **Joined:** Sat Oct 04, 2008 10:56 pm **Posts:** 12

Does anyone know the code for a 2007 STI? ECU: A2UJ000J

Some things I've noticed:
Initial startup ignition timing ranges from -3* to 1 or 2* advanced until coolant temps reach about 120f, then tapers up to the ~16 advance within 10 seconds. During that time, the car is very loud, the throttle is opened to -12in hg vacuum (usually 17-19) and cannot drive the car until the timing returns to normal.

I wonder if there's also a fix for the 1/3second throttle delay that's related to emissions...The delay is 100% NON EXISTANT in my 2004 STI. The 04 feels like it has a cable throttle, there's no delay and there's no hesitation that people seem to regularly experience. I'm getting close to finalizing my speed density tune (in the 07) and I figured the little hesitation is related to things not being perfect.

I don't know if anyone here rides dirtbikes but on a carbureted 450f if you goose the throttle from idle it has the same type of hesitation - often called flame-out in which the fuel enrichment doesn't travel fast enough as the throttle is opened (I think.).

aksubiedubie · **Joined:** Sat Oct 04, 2008 10:56 pm **Posts:** 12

aksubiedubie wrote:

Does anyone know the code for a 2007 STI? ECU: A2UJ000J

Some things I've noticed:
Initial startup ignition timing ranges from -3* to 1 or 2* advanced until coolant temps reach about 120f, then tapers up to the ~16 advance within 10 seconds. During that time, the car is very loud, the throttle is opened to -12in hg vacuum (usually 17-19) and cannot drive the car until the timing returns to normal.

I wonder if there's also a fix for the 1/3second throttle delay that's related to emissions...The delay is 100% NON EXISTANT in my 2004 STI. The 04 feels like it has a cable throttle, there's no delay and there's no hesitation that people seem to regularly experience. I'm getting close to finalizing my speed density tune (in the 07) and I figured the little hesitation is related to things not being perfect.

I don't know if anyone here rides dirtbikes but on a carbureted 450f if you goose the throttle from idle it has the same type of hesitation - often called flame-out in which the fuel enrichment doesn't travel fast enough as the throttle is opened (I think.).

I fixed the flame out hesitation; I made the tau cylinder wetting very similar to my 04 sti -- A few values were 0.25 ish and i made them 1.00. Still looking for those startup timing tables though

td-d · **Posted:** Wed Jul 02, 2014 9:03 am

aksubiedubie wrote:

Does anyone know the code for a 2007 STI? ECU: A2UJ000J

Code:

ROM:00094D78 Table_Ignition_Timing_Post_Start_MT:.data.w h'10 ; DATA XREF: sub_34B5E+96o
ROM:00094D78                                         ; sub_34CD4:off_34D40o
ROM:00094D7A                 .data.w h'400
ROM:00094D7C                 .data.l h'CD1B0 <----------------------X axis
ROM:00094D80                 .data.l byte_CD230      ; = 2.008e1 <---------------------Table data
ROM:00094D84                 .float 0.3515625
ROM:00094D88                 .float -20.0

nxm08240 · **Joined:** Wed Mar 21, 2012 10:45 pm **Posts:** 69

I sent you an email td-d

MFB · **Posted:** Mon Oct 20, 2014 11:44 pm

Is this supposed to reflect in total ignition timing upon startup?

nxm08240 · **Joined:** Wed Mar 21, 2012 10:45 pm **Posts:** 69

That's what I assume. If you log Total Ignition Timing upon cold start you will see it hovers right around 0 to -3* retard. And high EGTs. Then I assume after a Decay it resumes to normal, I also notice on mine that when it does switch to the low timing, the AFRs go to stoich when they should be lower.

ride5000 · **Joined:** Thu Aug 03, 2006 2:40 pm **Posts:** 1934

definitely sounds like a cat light off routine.

td-d · **Posted:** Tue Oct 21, 2014 11:38 am

nxm08240, I think it's these ones:

Code:

ROM:000956BC Table_Ignition_Timing_Post_Start_MT:.data.w h'10 ; DATA XREF: sub_3713E+9Ao
ROM:000956BC                                         ; sub_37202:off_37348o
ROM:000956BE                 .data.w h'400
ROM:000956C0                 .data.l h'CBA0C
ROM:000956C4                 .data.l byte_CBAAC      ; = 2.008e1
ROM:000956C8                 .float 0.3515625
ROM:000956CC                 .float -20.0
ROM:000956D0 Table_Ignition_Timing_Post_Start_AT:.data.w h'10 ; DATA XREF: sub_3713E+A2o
ROM:000956D0                                         ; sub_37202:off_3734Co
ROM:000956D2                 .data.w h'400
ROM:000956D4                 .data.l h'CBA0C
ROM:000956D8                 .data.l byte_CBABC      ; = 2.008e1
ROM:000956DC                 .float 0.3515625
ROM:000956E0                 .float -20.0

td-d · **Posted:** Tue Oct 21, 2014 11:42 am

Andthe minimum timing table:

Code:

ROM:000956A8 Table_Minimum_Timing:.data.w h'10       ; DATA XREF: sub_373F6+376o
ROM:000956A8                                         ; sub_377C6+1Ao ...
ROM:000956AA                 .data.w h'400
ROM:000956AC                 .data.l h'CBA0C
ROM:000956B0                 .data.l byte_CBA9C      ; = 2.852
ROM:000956B4                 .float 0.3515625
ROM:000956B8                 .float -20.0

nxm08240 · **Joined:** Wed Mar 21, 2012 10:45 pm **Posts:** 69

What is wrong here? Do I have to get the address' for A8DH200X because it inherits from that? Not really sure how that works...

Edit: Got the ignition timing to show correctly I believe. The coolant temp is not showing correctly... Here is my base and rom definitions

td-d · **Posted:** Wed Oct 22, 2014 6:10 am

Your axis name is wrong - Y, not X - see the 32bitbase table.

nxm08240 · **Joined:** Wed Mar 21, 2012 10:45 pm **Posts:** 69

I think I got it now. Sorry I am new to the whole definition stuff.... I'm a little confused by the Minimum Timing (Engine Speed) Values....?

RomRaider

Initial Ignition Timing Post Start

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