Stock Mazda Fuel & Ignition Maps
3 Attachment(s)
I dont want to get too deep into this but here is what they look like from the N3A7 ROM..
I've attached the Primary Fuel map, Leading & Trailing Ignition maps. |
Damn man! What are you, some kind of sleepless tinkering junkie?
;) |
you're one to talk ;-)
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Can you upload this in table form? What are you using to dump the chip? and can you explain the units used here
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WOW u has haxed the Motorola chip ?
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Wow!
So the OEM maps are 12 (rpm units) x 14 (load units) so the PFC's 20 x 20 is a finer matrix |
Originally Posted by Julian
(Post 9654465)
So the OEM maps are 12 (rpm units) x 14 (load units) so the PFC's 20 x 20 is a finer matrix
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I would expect stock maps to go past 8000 rpm; because for years I drove on stock ecu to 8500. I would expect rpm to ~9000 (750 increments); and from x? inches to 13-14 psi?
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^ unlikely it is in psi... even GM does all their turbo speed density maps (GMC Syclone) in kilopascals
is the fuel map a volumetric efficiency table like GM uses? And are there boost modifier tables... again I am pretty familiar with the Syclone setup so I wonder how these compare |
I don't want to to get into it too much because I'm still trying to figure things out (read: learning).
Currently I don't know the scalars but I'm making highly uneducated guesses at the scales (500 - 8000 RPM & -700mmHg to +700mmHg). At this point, I believe the maps are Load vs. RPM based. There is most likely Throttle vs. RPM maps too (tip-in,etc) but I've yet to locate them. In conjunction with some help, I've managed to bang out an IDA Pro Processor module to aid in disassembling the firmware from the external memory chips. My goal is to build a reflashable stock "single turbo" ecu but this is a long ways off from where i stand now. |
2 Attachment(s)
You will have to get some idea of how load is calculated then. On MAF based systems, it is usually measured airflow divided by rpm or measured airflow divided by some "ideal" airflow.
On the Syclones (MAP based just like the FD), fuel is calculated like this: BPW = BPC * MAPP * T' * A/F' * VE * F33C * BLM * DFCO * DE * CLT * F77 Where: BPW = Base Pulse Width BPC = Base Pulse Constant Term MAPP = Manifold Pressure Term T' = Inverse Temperature Term A/F' = Inverse Air Fuel Ratio Term VE = Volumetric Efficiency Term F33C = Battery Voltage Correction Term BLM = Block Learn Correction Term DFCO = Decel Fuel Cutoff Term DE = Decel Enleanment Term CLT = Closed Loop Correction Term F77 = Turbo Boost Multiplier see http://www.nwstp.com/forum/P4_section_9.asp Factory ECU's are designed to model the engine and its potential for emissions, which explains some of the complication. Here is a list of some of the most important tables in the Syclone ECU: http://www.nwstp.com/forum/chiptable.asp Here are the two most important fuel tables in the Syclone ECU: https://www.rx7club.com/attachment.p...1&d=1259792721 This is the basic volumetric efficiency % vs rpm vs map table. But when the Syclone goes into boost, the boost modifier trim kicks in: https://www.rx7club.com/attachment.p...1&d=1259792721 This is a two dimensional table of MAP (kilopascals absolute pressure) vs I believe a volumetric efficiency correction factor. The two tables work together along with all the other corrections. I'll see if I can dig up some stuff on the Honda internal ECU architecture. It may be closer to the FD design than the GM architecture. Again, can you post those maps in a more readable 2 dimensional table form? |
Originally Posted by arghx
(Post 9655105)
You will have to get some idea of how load is calculated then. On MAF based systems, it is usually measured airflow divided by rpm or measured airflow divided by some "ideal" airflow.
On the Syclones (MAP based just like the FD), fuel is calculated like this: BPW = BPC * MAPP * T' * A/F' * VE * F33C * BLM * DFCO * DE * CLT * F77 Where: BPW = Base Pulse Width BPC = Base Pulse Constant Term MAPP = Manifold Pressure Term T' = Inverse Temperature Term A/F' = Inverse Air Fuel Ratio Term VE = Volumetric Efficiency Term F33C = Battery Voltage Correction Term BLM = Block Learn Correction Term DFCO = Decel Fuel Cutoff Term DE = Decel Enleanment Term CLT = Closed Loop Correction Term F77 = Turbo Boost Multiplier see http://www.nwstp.com/forum/P4_section_9.asp Factory ECU's are designed to model the engine and its potential for emissions, which explains some of the complication. Again, can you post those maps in a more readable 2 dimensional table form? Why do I need to do this again? Knowing what the numbers mean wont really help. Case & point would be with 90% of the "tuners" out tuning cars probably couldn't tell us how the computer figures up the fuel at the end of the routine but they "know" how to add/subtract fuel in various increments. |
Originally Posted by hwnd
(Post 9655137)
Why do I need to do this again?
Knowing what the numbers mean wont really help. 90% of the "tuners" out tuning cars probably couldn't tell us how the computer figures up the fuel at the end of the routine but they "know" how to add/subtract fuel in various increments. On Karman vortex MAF based ECU's, if you didn't know that the tables were based on Karmann Hz you'd never understand what you were dealing with. Hertz/Karmann signals are not the same as hotwire signals. check out other sites like romraider.com, pgmfi.org, etc |
Originally Posted by arghx
(Post 9655156)
Have you ever done any flash tuning or significant chip tuning?
I'm leaving work, when I get home I'll post a few images that might help you better understand where I'm going with this (after dinner of course). |
subscribed
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1 Attachment(s)
This might give you a better idea of what I'm doing...
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interested
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looks like assembly language?
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Originally Posted by kompressorlogic
(Post 9655711)
looks like assembly language?
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8bit (dis)Assembly Motorola baby!
I actually ended up having to write the disassembler plug-in for IDA.. It's loosely based on the 68k series but still remains a private semi-custom Denso chip. ..no hex editing done here. recompile or bust! :-) |
look like nuclear missile codes to me :lol:
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To the OP:
The 2nd Gen Ford Probe uses the same micro. and a couple of guys on probetalk have done quite a bit of disassembly on it and are very familiar with it. Look for Mike 94PGT or ASword , they may be able to give some info you might not already have. |
Which processor?
HC11G5 or D8x? ...FD ecu has 3 in it. |
For this project to really move any further.. it'll take an EE to decipher the Denso/Toshiba processor.. My BDM isn't working with the G5 proc.. mfgr isn't really any help either.
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so how about putting those maps in a chart rather than a 3d rendering? I'd like to see the trailing split progression
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its less than you might think. it's 0* split in vac areas and max 4* split in boost. that's really it.
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ether you guys are ridiculously smart or you all need a vacation.
I have not clue what you guys are talking about but it sounds cool. |
Info like this makes me think of the good old days, back when the signal-to-noise ratio of the internet was nice and high... before myspace, facebook, and iTunes.
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i really cant understand this.. but good work for doing what you do
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Yeah over my head too, I generally submerge myself with the information until I understand it. But I would just drown, trying to understand all this. Explain it in simple terms lol JUST KIDDING
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Originally Posted by scotty305
(Post 9657993)
Info like this makes me think of the good old days, back when the signal-to-noise ratio of the internet was nice and high... before myspace, facebook, and iTunes.
There is still plenty of that. Usually not on car forums though. :) |
1 Attachment(s)
I have a programmer board/adapter coming for the Motorola G5 processor using the M68SPGMR11 programmer. :nod:
Was a bit rough finding this one. |
Originally Posted by Dudemaaanownsanrx7
(Post 9658531)
Yeah over my head too, I generally submerge myself with the information until I understand it. But I would just drown, trying to understand all this. Explain it in simple terms lol JUST KIDDING
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Originally Posted by hwnd
(Post 9657355)
its less than you might think. it's 0* split in vac areas and max 4* split in boost. that's really it.
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Originally Posted by mdpalmer
(Post 9659705)
^^ 4* split in boost? I thought Mazda spec was at at LEAST 14* split in boost. I'm no expert but that's what I understand :dunno:
I haven't ever see any evidence proving numbers. |
If you don't know the units used in the Mazda tables, how do you know it's 4 degrees split? serious question
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Originally Posted by hwnd
(Post 9655798)
8bit (dis)Assembly Motorola baby!
I actually ended up having to write the disassembler plug-in for IDA.. It's loosely based on the 68k series but still remains a private semi-custom Denso chip. ..no hex editing done here. recompile or bust! :-) |
Originally Posted by arghx
(Post 9660301)
If you don't know the units used in the Mazda tables, how do you know it's 4 degrees split? serious question
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Originally Posted by arghx
(Post 9660301)
If you don't know the units used in the Mazda tables, how do you know it's 4 degrees split? serious question
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Originally Posted by Julian
(Post 9660456)
I don't think he was implying absolute values but rather relative. some areas of L/T maps look the same i.e. zero split; other areas have up to 4 x's magnitude difference.so maybe 4 x 3.5 degs == 14 deg total split
you're right - the entire trailing map (in vacuum) is of the same value... it fades from -4* degree to -14.8* in fact, 5K Revs column is 0* trailing until atmospheric pressure which is then -4.9*, -9.5* then 14.8* it continues like that all over the map. |
4 Attachment(s)
Only way to prove numbers in the real world would be to use a Mazda tester/monitor tool. Also, the service highlights manual indicates that timing can vary up to 7 degrees based on knock sensor feedback alone.
https://www.rx7club.com/attachment.p...1&d=1260059720 for reference, here are the early model PFC timing maps (current PFC default maps are different). Supposedly these are close to stock. https://www.rx7club.com/attachment.p...1&d=1260059720 https://www.rx7club.com/attachment.p...1&d=1260059720 here is the final injector pulsewidth map (hidden basemap * Commander INJ map correction) for that same model PFC. this does not include air temp etc corrections https://www.rx7club.com/attachment.p...1&d=1260060264 10000 PIM units = atmospheric pressure 20000 PIM units = 1.0 kg/cm^2 boost or 14.22 psi -- leading timing is in degrees BTDC -- trailing timing is the number of degrees of separation between firing of the trailing and leading plugs -- fuel map is in milliseconds of injector pulsewidth |
subscribed buddy ;) (not that i understand it all, but i do understand enough to know that its pimp ish lol)
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updates?
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Originally Posted by arghx
(Post 9710361)
updates?
I've since moved on to other projects to keep me busy. |
I think I know the answer, but have you found any of the other fuel/timing maps in the ECU or figured out what units the maps are actually representing?
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Originally Posted by hwnd
(Post 9659849)
I haven't ever see any evidence proving numbers.
the rx8 can be plugged into the dealership computer, it also runs more split @wot than it does at say half throttle. i do not specifically know about the FD of course... |
Of course there is more information... OMP, correction tables, etc..
There are a few people here who I've shared that information with but for something more specific you could always log the FD and build your own map for these or run the ECU on a workbench. I didn't have any help extracting this information and dont feel the need to release it. Sorry. |
^ ouch
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Originally Posted by hwnd
(Post 9713221)
Of course there is more information... OMP, correction tables, etc..
There are a few people here who I've shared that information with but for something more specific you could always log the FD and build your own map for these or run the ECU on a workbench. I didn't have any help extracting this information and dont feel the need to release it. Sorry. |
^_^
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