Ignition Retard Limit
 

Hi Guys,

While looking for this knock stuff I came across the Ignition Retard limit in the ROM.

88590015 and 88580013 (9's???): 0x133e
96530006 and 94170015 (8's???): 0x173e

2 bytes, so uint16 scaling.

Now it defaults to 203 (or 0xCB), I found that by increasing it to 220 I was able to run -15* as opposed to the previous limit of -10*.

Now whoever disasm'd this ROM (Bez???) already found this, so I don't want to take any credit for it :)

Also I don't know the proper scaling yet, but if anyone figures it out let me know :)

Usual deal of test everything at idle - altmaps makes testing this pretty easy, just leave your standard map as-is, and then flick to altmaps with lots of timing retard at idle..

Cheers
D.

That retard limit was referred in this thread as well:

https://www.evolutionm.net/forums/sh...9&postcount=13

90550001 should have the same: 0x173e (uint16)

Have it in my 96530006 def - but not played with it yet (actually do not need such a big retard :)

Unless you're a ricer and like to shoot flames ... like me. :lol:

or want to make a custom ALS using altmap ;)
great find :)

Tephra, can you find the address for rom 88840016 or 17?

mine is set to 255 on rom 90550001 but when logged it still only goes to -10 . regardless of what you put in the map.

In 88840016 and 17 address is 0x133e, but changing the value gives not linear results ad tephra wrote. I never logger less than -15 changing only 0x133e...

try setting 0x2038 the same as 0x133e

0x2038 should default to 0xCB as well..

edit - 2038 not 2308 :)

Howdy dave
according to bez to get the timing to retard to anything below -10 you had to patch a few different places in the rom as there was a lot of code to stop the timing from dropping,
in the rom bez sent me he has full antilag, realtime tuning and speed density setup.
it would be excellent if you could incorporate these mods with your own to make a super patch,
if the above could be patched along with your own mods it would mean the stock ecu would be as powerfull as any aftermarket ecu,
and as bez has stated he is fully willing to share his findings for the benefit of the community ;)

I agree it would be closer but I want more load and rpm columns ;)

Change it to 128 and watch the 36 counts of knock that appear from nowhere ;)

yeah because 128 would actually be limitting the retard so much that you are going into advance there... ie not allowing advance to drop below 10* or whatever...

90550001 uses 0x173e (or 0x173f unit 8) (by the way those address's work for all E7, E8 and E9 roms)

So would 0x2038 workout to be 0x2438 for 90550001 and all other e7 and 8 roms ?

:D er, ive enough knock thanks,,think il sharpen up that chainsaw :lol:

Amen to that!{thumbup}

173e doesn't work for all rom's - my first post has what 173e is in evo9 land :)

I looked at the code for 90550001 and its totally different... doh

Interestingly in 90550011 the 0x173e is 0xBC not 0xCB