08-02-2019, 10:14 PM
now some idea's about the 1.8 liter ,and 2.3L , Firmware factory MAP tables,(3D they are) (fuel map over load/rpm) injection maps.
the PCM on your car has j18 map tables, (map for short)
and will be lean WOT for this engine, (in theory)
The truth is , with the injectors lean, at idle and at CLosed loop cruising, right foot steady, The ECU fuel trim will try its best to make the 02 happy, called STOICH.
then...
what can happens next is at WOT, wide open throttle, the map is lean , but the MAF will not lie. the MAF never lies, but in truth the MAF is data (and calc. load) indexed into the MAP tables.
and injections happen at the MAP table rates, not in closed loop. The tables also are 2, one for open loop and one for closed, and trim added. (and one more for cold engine)
all comments, hot engine and close or open loop.
if it is lean you'd feel it. power falls off lean, big time, , normally at WOT or hard acceleration the CL goes false , and engine goes rich for full power, on all cars. (NA, gasoline)
if not and lean power falls off FAST. the engine feels lack luster, and weak,
if the engine feels very responsive it is not lean with fast right foot.
I bet it runs good, right?
also lean would cause PINGING, and that is super bad, if that happens, but the EGR may hide that, as it normally does.
some of these 2.3 liter engines have PING sensor (detonation microphone ) and this retards spark to end/prevent ping, so that is now missing .
if fact it can hear early ping no human can hear and ends it before you do... all by magic on newer cars.
this trick is done to make higher compression engines not PING. (j23 ECU)
and pinging engine overheats, and in fact helps to make it worse. PINGING happens at max combustion temps. so... is complex here.
just something to think about, not saying this is a problem here. ok?
the PCM on your car has j18 map tables, (map for short)
and will be lean WOT for this engine, (in theory)
The truth is , with the injectors lean, at idle and at CLosed loop cruising, right foot steady, The ECU fuel trim will try its best to make the 02 happy, called STOICH.
then...
what can happens next is at WOT, wide open throttle, the map is lean , but the MAF will not lie. the MAF never lies, but in truth the MAF is data (and calc. load) indexed into the MAP tables.
and injections happen at the MAP table rates, not in closed loop. The tables also are 2, one for open loop and one for closed, and trim added. (and one more for cold engine)
all comments, hot engine and close or open loop.
if it is lean you'd feel it. power falls off lean, big time, , normally at WOT or hard acceleration the CL goes false , and engine goes rich for full power, on all cars. (NA, gasoline)
if not and lean power falls off FAST. the engine feels lack luster, and weak,
if the engine feels very responsive it is not lean with fast right foot.
I bet it runs good, right?
also lean would cause PINGING, and that is super bad, if that happens, but the EGR may hide that, as it normally does.
some of these 2.3 liter engines have PING sensor (detonation microphone ) and this retards spark to end/prevent ping, so that is now missing .
if fact it can hear early ping no human can hear and ends it before you do... all by magic on newer cars.
this trick is done to make higher compression engines not PING. (j23 ECU)
and pinging engine overheats, and in fact helps to make it worse. PINGING happens at max combustion temps. so... is complex here.
just something to think about, not saying this is a problem here. ok?
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