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#1036
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Re: Memory dump of ECU
Thanks Phil,
You have specifically provided the specific answer I required. i.e. advise which sensors provide the signals which are computed, in order to arrive at the figure covering engine load? --- M = Mass Airflow is measured in grams of air per second. R = Engine Speed is measures in Revolutions per minute. Engine Load is (M * 60) / R = grams of air ingested per revolution of the engine. The line pressure is not decided by the engine load. But the engine load and the transmission line pressure are both ultimately dictated by the throttle. Correlation, not Causation. But it certainly makes sense that the TCU would be designed to increase line pressure in line with the torque produced by the engine. I agree, the engine load is in no way dictated, which partly the reason for my enquiry. The actual engine load directly involves the selected gear ratio and the load imposed on the vehicle, regardless of throttle position. You have confirmed that engine load as a factor in setting line pressure, is confined to measurement derived from mass airflow and engine speed sensors. Special thanks, Trevor.
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Trevor, New Zealand. As a child, on cold mornings I gladly stood in cowpats to warm my bare feet, but I detest bull$hit! |
#1037
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Re: Memory dump of ECU
Okay have cut a deal to borrow the select monitor again on Friday for the weekend. So the plan is to complie more ECU map data. I have ben talking to Phil and I am confused as to how our ECU's figure out the fuel map from O2's. Due to this I want to run a couple of load map examples with the O2's unpluged for comparision purpose.
Maybe we can use the data to figure out how Load is worked out. Tony
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1995 - SVX 700,000 K Mine, DMS Struts to lift car 2in. Tyres Wrangler Silent Armor 235/70R16, PBR Radiator. 6 speed with DCCD and R180 rer diff, Heavy duty top strut mounts front and rear. Speedo correction box fitted. New stero (gave up on the old one). Back seat removed and 2 spare tyres fitted for desert driving. ECUTune SC sitting in the box for the next SVX. 1992 - SVX 255 K Wife (Want to stay Married so not allowed to fit SC) 1992 - SVX Pearl with black roof race car roll cauge etc ready to race. Ex Tasman Targa car. 1995 - SVX Green low k mint condiation. 1995 - SVX Rally car, ex Matts car. Now to be used on track. 1992 - SVX red & Black being converted to Mid Engine. 1995 - SVX Red 143,000 bit rough. Owned 5 others Subaru back to a 1974 1400 GSR. |
#1038
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Re: Memory dump of ECU
Quote:
Phil in his latest post post, has advised exactly how the figure for load is worked out. No additional investigation is required in this regard.
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Trevor, New Zealand. As a child, on cold mornings I gladly stood in cowpats to warm my bare feet, but I detest bull$hit! |
#1039
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Re: Memory dump of ECU
Trevor phil suggests that is the way with new cars, we need to confirm its the same with ours.
Please ignore photo 5 in table as I think there is an error. Last thing I can't run the tests this weekend due to one of my guys being away and I need to work today. Tony
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1995 - SVX 700,000 K Mine, DMS Struts to lift car 2in. Tyres Wrangler Silent Armor 235/70R16, PBR Radiator. 6 speed with DCCD and R180 rer diff, Heavy duty top strut mounts front and rear. Speedo correction box fitted. New stero (gave up on the old one). Back seat removed and 2 spare tyres fitted for desert driving. ECUTune SC sitting in the box for the next SVX. 1992 - SVX 255 K Wife (Want to stay Married so not allowed to fit SC) 1992 - SVX Pearl with black roof race car roll cauge etc ready to race. Ex Tasman Targa car. 1995 - SVX Green low k mint condiation. 1995 - SVX Rally car, ex Matts car. Now to be used on track. 1992 - SVX red & Black being converted to Mid Engine. 1995 - SVX Red 143,000 bit rough. Owned 5 others Subaru back to a 1974 1400 GSR. |
#1040
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Re: Memory dump of ECU
For anyone interested... I sold my select monitor but still have my USB EvoScab cable and the Jumper SSM harness I built to listen in on the comm between the SSM and the ECU...
I have no use for them, maybe someone else would like to have them, shoot me a PM Tonm |
#1041
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Re: Memory dump of ECU
PM sent
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#1042
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Re: Memory dump of ECU
The following suggestion is one that comes from left field were the tooth fairy lives.
I am of the opinion/understanding that the current ECU in the SVX has no fuel map. What it does is experiment to find the right amount of fuel to inject for a give airflow through the MAF to acheive the disired AirFuel ratio. This then forms the learning refered to all the time. The timing has a map but is effected by the knock sensors in that if the fuel learning causes a problem that shows up in the engine knock sensors it pulls the timing to prevent damage. If I am correct you should be able to get far more power from the standard ECU. You need to run tests to see what the full load limits are for the injectors (duty cycle) and Airflow(voltage max) and as each of these is reached replace them. It would also be able to cheat the standard ECU to increase the fuel injected by reconfigure the O2 sensor signal. So there it is, a tooth fairy theory, what do you all think. Tony
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1995 - SVX 700,000 K Mine, DMS Struts to lift car 2in. Tyres Wrangler Silent Armor 235/70R16, PBR Radiator. 6 speed with DCCD and R180 rer diff, Heavy duty top strut mounts front and rear. Speedo correction box fitted. New stero (gave up on the old one). Back seat removed and 2 spare tyres fitted for desert driving. ECUTune SC sitting in the box for the next SVX. 1992 - SVX 255 K Wife (Want to stay Married so not allowed to fit SC) 1992 - SVX Pearl with black roof race car roll cauge etc ready to race. Ex Tasman Targa car. 1995 - SVX Green low k mint condiation. 1995 - SVX Rally car, ex Matts car. Now to be used on track. 1992 - SVX red & Black being converted to Mid Engine. 1995 - SVX Red 143,000 bit rough. Owned 5 others Subaru back to a 1974 1400 GSR. |
#1043
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Re: Memory dump of ECU
The fuel and timing tables are straightforward and well understood.
Fuel There is a target AFR map. The ECU measures how many grams of air are flowing into the engine using the MAF sensor. Then it calculates exactly how many grams of fuel it must mix with that air to achieve the target AFR. When driving at constant speed, the O2 sensors provide feedback that allows the ECU to tweak the amount of fuel to compensate for the quality of the fuel and the density of the air. When these feedback adjustments have been calculated, they get remembered. (learning). Timing There is a "base timing" map and an "permitted advance" map. There is an "advance multiplier" value that determines what percentage of the permitted advance gets added to the base timing. The ECU adjusts the advance multiplier based on the amount of knock detected. If no knock is detected it will slowly increase the advance multiplier towards 100%. When knock is detected, it will backs off a little.
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Subaru ECU and TCU Website 1992 Alcyone SVX Version L 1992 Alcyone SVX Version L 1994 Alcyone SVX S40-II 2004 Subaru Legacy 2.5 SE Sports Tourer 1996 Subaru Legacy 2.2 GX Wagon 1988 Subaru Justy J12 SL-II |
#1044
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Re: Memory dump of ECU
Hi Phil,
Does the ECU have a preloaded starting point for grams of fuel based on something like revs or what ever or does it just work it out. In other words if I put injectors that were 20% larger would the ECU function correctly and correct for them. Tony
__________________
1995 - SVX 700,000 K Mine, DMS Struts to lift car 2in. Tyres Wrangler Silent Armor 235/70R16, PBR Radiator. 6 speed with DCCD and R180 rer diff, Heavy duty top strut mounts front and rear. Speedo correction box fitted. New stero (gave up on the old one). Back seat removed and 2 spare tyres fitted for desert driving. ECUTune SC sitting in the box for the next SVX. 1992 - SVX 255 K Wife (Want to stay Married so not allowed to fit SC) 1992 - SVX Pearl with black roof race car roll cauge etc ready to race. Ex Tasman Targa car. 1995 - SVX Green low k mint condiation. 1995 - SVX Rally car, ex Matts car. Now to be used on track. 1992 - SVX red & Black being converted to Mid Engine. 1995 - SVX Red 143,000 bit rough. Owned 5 others Subaru back to a 1974 1400 GSR. |
#1045
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Re: Memory dump of ECU
Quote:
If you put bigger injectors, you just change the parameter and the ECU will adjust the injector open time accordingly. ie. You tell the ECU that the injectors are 20% bigger and it will open them for 20% less time to deliver the same amount of fuel. There is also a lag time map based on battery voltage. ie. At low voltage, the injectors take longer to fully open and therefore less fuel is delivered. So you increase the pulse width slightly at low voltages to get the right amount of fuel.
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Subaru ECU and TCU Website 1992 Alcyone SVX Version L 1992 Alcyone SVX Version L 1994 Alcyone SVX S40-II 2004 Subaru Legacy 2.5 SE Sports Tourer 1996 Subaru Legacy 2.2 GX Wagon 1988 Subaru Justy J12 SL-II |
#1046
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Re: Memory dump of ECU
So Phil I assume we haave to put in the extra board to change the injector size parameter, is that correct?
__________________
1995 - SVX 700,000 K Mine, DMS Struts to lift car 2in. Tyres Wrangler Silent Armor 235/70R16, PBR Radiator. 6 speed with DCCD and R180 rer diff, Heavy duty top strut mounts front and rear. Speedo correction box fitted. New stero (gave up on the old one). Back seat removed and 2 spare tyres fitted for desert driving. ECUTune SC sitting in the box for the next SVX. 1992 - SVX 255 K Wife (Want to stay Married so not allowed to fit SC) 1992 - SVX Pearl with black roof race car roll cauge etc ready to race. Ex Tasman Targa car. 1995 - SVX Green low k mint condiation. 1995 - SVX Rally car, ex Matts car. Now to be used on track. 1992 - SVX red & Black being converted to Mid Engine. 1995 - SVX Red 143,000 bit rough. Owned 5 others Subaru back to a 1974 1400 GSR. |
#1047
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Re: Memory dump of ECU
Yes. You can't change anything without fitting an eeprom board.
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Subaru ECU and TCU Website 1992 Alcyone SVX Version L 1992 Alcyone SVX Version L 1994 Alcyone SVX S40-II 2004 Subaru Legacy 2.5 SE Sports Tourer 1996 Subaru Legacy 2.2 GX Wagon 1988 Subaru Justy J12 SL-II |
#1048
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Re: Memory dump of ECU
Phil a question.
What is the speedo output based on in terms of pulses. In other words is it 1 pulse per rev of the wheel. Tony
__________________
1995 - SVX 700,000 K Mine, DMS Struts to lift car 2in. Tyres Wrangler Silent Armor 235/70R16, PBR Radiator. 6 speed with DCCD and R180 rer diff, Heavy duty top strut mounts front and rear. Speedo correction box fitted. New stero (gave up on the old one). Back seat removed and 2 spare tyres fitted for desert driving. ECUTune SC sitting in the box for the next SVX. 1992 - SVX 255 K Wife (Want to stay Married so not allowed to fit SC) 1992 - SVX Pearl with black roof race car roll cauge etc ready to race. Ex Tasman Targa car. 1995 - SVX Green low k mint condiation. 1995 - SVX Rally car, ex Matts car. Now to be used on track. 1992 - SVX red & Black being converted to Mid Engine. 1995 - SVX Red 143,000 bit rough. Owned 5 others Subaru back to a 1974 1400 GSR. |
#1049
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Re: Memory dump of ECU
AFAIK it's 4 pulses per revolution.
__________________
Subaru ECU and TCU Website 1992 Alcyone SVX Version L 1992 Alcyone SVX Version L 1994 Alcyone SVX S40-II 2004 Subaru Legacy 2.5 SE Sports Tourer 1996 Subaru Legacy 2.2 GX Wagon 1988 Subaru Justy J12 SL-II |
#1050
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Re: Memory dump of ECU
Thanks Phil.
Tony
__________________
1995 - SVX 700,000 K Mine, DMS Struts to lift car 2in. Tyres Wrangler Silent Armor 235/70R16, PBR Radiator. 6 speed with DCCD and R180 rer diff, Heavy duty top strut mounts front and rear. Speedo correction box fitted. New stero (gave up on the old one). Back seat removed and 2 spare tyres fitted for desert driving. ECUTune SC sitting in the box for the next SVX. 1992 - SVX 255 K Wife (Want to stay Married so not allowed to fit SC) 1992 - SVX Pearl with black roof race car roll cauge etc ready to race. Ex Tasman Targa car. 1995 - SVX Green low k mint condiation. 1995 - SVX Rally car, ex Matts car. Now to be used on track. 1992 - SVX red & Black being converted to Mid Engine. 1995 - SVX Red 143,000 bit rough. Owned 5 others Subaru back to a 1974 1400 GSR. |
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