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#1
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how does the ecu determine the load on the engine?
I understant that in newer models, subaru installs a vaccum sensor to determine the load on the motor so the ECU can control more effectivelly the ignition time, but our SVX does not have a vaccum sensor... does it?
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#2
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Re: how does the ecu determine the load on the engine?
No. It uses the Mass air flow sensor to meter the amount of air the engine takes in.
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'92 SVX LS Pearl White - 6mt |
#3
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Re: how does the ecu determine the load on the engine?
Combination of throttle position sensor, RPM, MAF, probably the O2's as well... A lot of factors show how hard the engine is working.
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Chris 92 Ebony Mica LS-L "A Rolling Restoration": 223,250 KM - Sleeping 2007 STi 6MT, Stance GR+ coilovers, PWR Rad, JDM hood badge, svxfiles 6000K HIDs, JDM Clear Corners, $15/15 min mod, $20/20 min mod, Energy Swaybar Bushings, Hella Supertones horns, Gold STi BBS rims, Group A lightweight crank pulley, A/C system removed, Custom header-back exhaust, Hybrid carbon/metal rear sway bar, restored headlights with CCFL halos 2008 Subaru Legacy Spec B - Diamond Grey Metallic - Sold 2020 Ram 1500 Longhorn - Red Pearl |
#4
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Re: how does the ecu determine the load on the engine?
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The later phase 11 autos have another speed sensor on the turbine shaft to determine the difference in speed between the impeller and the turbine that gives a direct read of load. Harvey.
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One Arm Bloke. Tell it like it is! 95 Lsi. Bordeaux Pearl, Aust. RHD.149,000Kls Subaru BBS wheels. 97 Liberty GX Auto sedan. 320,000Kls. 04 Liberty 30R Auto Premium. 92.000kls. |
#5
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Re: how does the ecu determine the load on the engine?
Load is determined using the mass airflow rather than manifold absolute pressure sensors like newer ssubies do
Tom |
#6
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Re: how does the ecu determine the load on the engine?
Just saying : how on earth back in the day ( pre 1970 ) did we ever operate an automobile motor by just the use of a heat sensitive spring operating a small plate in the throat of the carb. ( automatic choke ) boy we have come a long way baby
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#7
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Re: how does the ecu determine the load on the engine?
Engine Load is usually measured as grams of air per revolution (g/rev). Some manufacturers do per cylinder instead.
The most basic equation is divide Mass Airflow (grams per second) by Engine Speed (revolutions per second ie. RPM divided by 60).
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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 |
#8
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Re: how does the ecu determine the load on the engine?
Isnīt it easier to have the readings of an intake manifold pressure to know the engine load and adjust it with the readings from the RPM, MAF and TPS?
what does longassname think about it? (I send you a PM some days ago) How does the new 1av1 calculate the engine load so it can tune the timing advance? would you recomend the use of a vaccum transmitter/sensor working together wit a new chip program? |
#9
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Re: how does the ecu determine the load on the engine?
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Keith |
#10
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Re: how does the ecu determine the load on the engine?
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MAP sensor is only used for boost cut and barametric compensations. However sometimes you can flash the rom to a Group N version which runs on MAP - romraider for more. Quote:
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#11
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Re: how does the ecu determine the load on the engine?
my goal, as always, is try to understand the control a little more. Our SVX have only a MAF, not a MAP.
The ignition timing on the original ECU fails in properlly advance the ignition, so we can feel the advance increase as we rise the RPM's in a 0 to 100 aceleration. It is too delayed. New softwares have inproved the preformance by advancing the ignition map, but what are the signal it takes and what is the weight of each of those to change the ignition map. I've read that the new 1av1 does not need to learn (the ignition timing advance) because it change the map everytime you drive the car but again, what factors makes the map be changed and in what proportion? I'm planning to build my own HHO generator and install it on my SVX using GLP injectors @ 8-15psi. I'm working on the desing of all the components and in the software I'll use on the new micro PLC. This is going to be a seccondary ECU to control the HHO system. I'm willing to include a load injection increase feature (like the gasoline jet on the carburators). If I succes, I'll share this on this net. |
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