negative split
06-22-10, 12:20 PM
#102
BDC Motorsports
Nope; at least not directly through the E6K/E6X programs. However, I'm interested in seeing if it's possible to modify a file directly and change the two split tables and then see if the ECU actually fires the trailing ahead of the leading. Plan on working on it today.
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06-22-10, 12:32 PM
#104
BDC Motorsports
I think so. I think its the user interface on the older programs that's disallowing it. I'd be willing to bet (not a lot, mind you!) that the ECU itself will work just fine firing trailing ahead of leading. It's just a matter of getting the data into the map by going around the user interface and modifying the file directly.
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06-22-10, 12:47 PM
#105
BDC Motorsports
Got it all fired up. Found where the trail split stuff starts in the raw file (around Offset 800). Looks like it's a no go for negative split from what I can tell. The hex data in those spots bottoms out at 00. Don't think it's possible to go to a lower value than that. This would require a firmware revision w/ an updated user interface.
06-22-10, 11:09 PM
#106
Got it all fired up. Found where the trail split stuff starts in the raw file (around Offset 800). Looks like it's a no go for negative split from what I can tell. The hex data in those spots bottoms out at 00. Don't think it's possible to go to a lower value than that. This would require a firmware revision w/ an updated user interface.
The firmware in the ECU might be bounds checking it or using it as an unsigned number. That would really kill any chances without a firmware update.
Of course, how familiar are you with negative numbers in binary? Your negative numbers are from 80 - FF where FF is -1. Or if its a 16 bit value, then FFFF to 8000 where FFFF is -1.
06-23-10, 01:16 AM
#107
BDC Motorsports
The firmware in the ECU might be bounds checking it or using it as an unsigned number. That would really kill any chances without a firmware update.
Of course, how familiar are you with negative numbers in binary? Your negative numbers are from 80 - FF where FF is -1. Or if its a 16 bit value, then FFFF to 8000 where FFFF is -1.
Of course, how familiar are you with negative numbers in binary? Your negative numbers are from 80 - FF where FF is -1. Or if its a 16 bit value, then FFFF to 8000 where FFFF is -1.
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06-23-10, 01:21 AM
#108
BDC Motorsports
Just tried taking a test E6K map and, via hex editor, changing the first 11 bars in the 0-2krpm split map from 00 to FF. Forced a change of 255 which actually showed up in the editor.
08-16-11, 11:58 PM
#110
It means 12A all ways^
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Neg split is running your trailing timing more advanced than your leading. Correct? I am running a megsquirt Ms1, is this possible with the ms1?
Thanks
Keith
Thanks
Keith
11-25-11, 06:53 PM
#111
02-23-12, 02:10 PM
#112
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So, I read through this thread, and am impressed with the amount of actuall information in it. A thought came to my mind, and I'm not too sure how well it would work in the upper rev ranges, but for those that don't have an ecu capable of running negative split, how would just switching the wires around work? Put your trailing on the leading, and the leading on the trailing. Obviously this would only be for an n/a application though.
02-23-12, 05:22 PM
#113
Negative split is designed for low vacuum/load levels. Fact...Mazda uses it for better emissions and fuel economy. It will also quiet down the exhaust pulses a bit. I heard you should not run negative under heavy loads as it may cause detonation.
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