Please help me understand M60 V8 404 DME ignition timing

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Mykk
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Please help me understand M60 V8 404 DME ignition timing

Post by Mykk » Thu Dec 03, 2015 3:16 pm

Hello guys,

I'm currently tuning my '95 540i/6, it has a swapped 404 DME (from 484) using a Moates Ostrich 2.0 chip emulator. Using the .xdf and .bin for the 404 from the tunerpro library the car runs.

I understand how to tune the fueling for desired effect (wideband O2 sensor & gauge mounted in the car) what I don't understand is the ignition maps. These figures can't be BTDC crank degrees;


Image

Can someone please help me figure out what I'm looking at and perhaps translate it to actual crankshaft degree btdc ignition timing? Thanks in advance, no pun intended -Mykk

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biela
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Post by biela » Sat Dec 05, 2015 11:02 am

Factor: 0.75 and offset:-45?

Guybrush
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Post by Guybrush » Sun Dec 06, 2015 11:34 pm

Just multiplie the raw numbers with 0.352 and you will convert them in degrees BTDC.

Mykk
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Post by Mykk » Mon Dec 07, 2015 10:07 am

GuyBrush, Thank you!

Guybrush
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Post by Guybrush » Mon Dec 07, 2015 10:26 am

:D

Mykk
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Post by Mykk » Wed Dec 09, 2015 11:20 am

Here is the timing map for my application in crank degrees from a different tuning product called a Miller W.A.R chip. It's a flashable chip that replaces the EPROM and uses the manufacturers proprietary software to modify and load the tunes on the chip.

This is the 92 octane timing map in crank degrees from Miller:

Image

This is my TunerPro .bin from the original post after multiplying by .352:

Image


After looking at the raw ignition timing table I decided to see what happens if I just subtracted 70 degrees from the original data:

Image

The .352 map doesn't look like what an original timing curve what come with from the factory. However the -70 timing curve is pretty close.

Mykk
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Post by Mykk » Wed Dec 09, 2015 1:10 pm

I'm beginning to think it's an xdf issue. I'm researching now how to make my own xdf's

Guybrush
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Post by Guybrush » Wed Dec 09, 2015 9:56 pm

Are the maps have the same memory address?(miller software and tuner pro xdf)

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biela
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Post by biela » Wed Dec 09, 2015 11:57 pm

Try with:
Major Order: Row
12 Rows and 10 columns
Conversion: x*0.75-45

Mykk
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Post by Mykk » Thu Dec 10, 2015 11:39 am

x.75 -45 can be a realistic timing curve for an M60B40:

Image

I do still need to make my own xdf/xds for a different bin, learning how to via as many resources as possible right now.

Mykk
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Joined: Sat Sep 05, 2015 8:28 am

Post by Mykk » Thu Dec 10, 2015 11:41 am

Guybrush wrote:Are the maps have the same memory address?(miller software and tuner pro xdf)
I'm afraid I don't know. Still falling down the rabbit hole, err...learning as much as I can about tuning bins and the code/software involved

Guybrush
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Post by Guybrush » Fri Dec 11, 2015 12:16 am

Send me the ori file bin and i see what i can do

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