Ignition Retard Limit

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Jul 31, 2009 | 05:42 AM

#46

Oettinger

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From: Barcelona

I change also this offset, 0x173f to 255 but... only -10º, not work 0x173f and 0x173e to 255, tephra any solution??

Jul 31, 2009 | 06:38 AM

#47

Mellon Racing

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Quote:

Originally Posted by Oettinger

With my ecu 96530006, i change adress 0x173e to 230 and no gain in log to -15 or -17 degress, not work this patch for evo 8, other solution please!! Only -10

i need -17 minimun.

what do you need -17 degrees of timing for?

Jul 31, 2009 | 09:36 AM

#48

JohnBradley

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Quote:

Originally Posted by Mellon Tuning

what do you need -17 degrees of timing for?

True Antilag. It will be generally in the range of 15-25* retard to ignite the fuel in the exhaust manifold. On a Euro car doesnt it already have the SAS factory system?

Jul 31, 2009 | 06:49 PM

#49

Oettinger

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From: Barcelona

Hello Mellon! more time without speak with you jeje all good friend?? Best Regards this spanish boy jeje

Yes is for real ALS, minimun is -17º, but ecu is only to -10º

In europe, SAS only un RS version, GSR version without SAS system.

With throttle kicker is the solution and retarding to -17º o r -20º, this ecu is very bad, this limitation is ugly.

Aug 1, 2009 | 07:47 AM

#50

Mellon Racing

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ok, I figured that's what you guys were getting at but didn't see it mentioned or just missed the point.

Aug 1, 2009 | 10:45 AM

#51

Oettinger

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From: Barcelona

Any solution for delimiting this restriction-ignition-retarding this ecu??

Aug 7, 2009 | 05:58 PM

#52

Biggy VIII

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From: Russia, Moscow

bump

Oct 1, 2009 | 07:13 PM

#53

Oettinger

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From: Barcelona

Tephra any info for this problem with retarding in ecu more -10º? Thanks!

Oct 1, 2009 | 08:50 PM

#54

Ceddy

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From: Reading, PA

Quote:

Originally Posted by tephra

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

The scaling in earlier ecus is: x * 90/256 degrees, referenced to the CAS pulse rising edge (75.77 degrees BTDC)

0xCB(#203) * 90/256 = 71.37 - 75.77 = -4.4 degrees

That gives a limit of -5 degrees not -10, I'm not sure if you have to factor in the 5 degrees of base timing, that could give the expected -10 degrees.

Edit:
This is incorrect scaling, see post 60.

Last edited by Ceddy; Oct 3, 2009 at 08:20 PM.

Oct 2, 2009 | 04:50 PM

#55

Oettinger

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From: Barcelona

Translate for humans please no for programers jejeje

Oct 3, 2009 | 05:03 PM

#56

JohnBradley

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Based on that math isnt less more? Or am I looking at it upside down?

Oct 3, 2009 | 05:22 PM

#57

Ceddy

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See post 60.

Last edited by Ceddy; Oct 3, 2009 at 08:21 PM. Reason: Wrong scaling, sorry.

Oct 3, 2009 | 05:38 PM

#58

JohnBradley

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I get it now, thanks Ceddy.

Oct 3, 2009 | 07:25 PM

#59

Biggy VIII

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From: Russia, Moscow

Quote:

Originally Posted by Ceddy

Its referenced to -81 degrees. Since its negative, its kinda backwards of what you would think. Less would be more retard.

000 = -81 degrees (rounded)
010 = -77
050 = -63
100 = -46
200 = -11
250 = 7
300 = 24
350 = 42

Each unit is about 1/3 degree.

Setting the limit to ~180 actually limits timing retard to -5 degrees. Setting it to 203 or more allow -10 degrees. Evo8 EDM 96530706.

So this logic is incorrect.

Oct 3, 2009 | 08:17 PM

#60

Ceddy

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From: Reading, PA

Quote:

Originally Posted by Biggy VIII

Setting the limit to ~180 actually limits timing retard to -5 degrees. Setting it to 203 or more allow -10 degrees. Evo8 EDM 96530706.

So this logic is incorrect.

Good looking out Biggy.

Thats an error on my part. There are like 10 different scalings for Ign Timing the ecu uses. I was looking at the wrong one.

People called this Tim61 in previous ecus.

x = 256 * (61 - degAdv) / 90

degAdv = 61 - (x * 90 / 256)

This would make:
220 = -16.34 degrees
203 = -10.37 degrees
188 = -5.09 degrees
173 = 0.18 degrees

If someone with an Evo ecu could confirm this scaling correct, it would be helpful.

Last edited by Ceddy; Oct 3, 2009 at 08:26 PM.

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