[C3H8]

another way of increasing ignition timing is by installing a 5K or 10K ohm potentiometer on the throttle position sensor. solder 1 of the 2 wires on the pot to the throttle position sensor's output wire, and the other wire to a ground.

then you have to use a scangauge or obd2 monitor to watch ign timing as you slowly increase the pot's resistance. this fools the computer into thinking the throttle is closed more then it really is, so it advances timing. on an automatic trans, this has the added benefit of lowering the rpm's at which the trans shifts, for more economy. my car has a manumatic trans, and when i have it in auto mode with the pot connected, it shifts into second egar at 10mph, 3rd at 20, 4th at 35 and locks up the torque conveeter at 40. in manual mode there is no differenced with or without the pot, except for the increased ignition timing.

another benefit of a pot on the tps, is that the torque converter stays locked up more often, even if you open the throttle a good bit. it still unlocks as it should when you punch it, or go over 50% throttle though. but for an ecomodder like myself, its virtually always locked up when driving at +40mph.

the last benefit i can think of, is that when decelerating from high speed, the computer cuts fuel more quickly, and cuts it for a longer amount of time because it thinks the throttle is closed more often. think of it as an automatic injector kill switch.

you can install the pot on the dash or centre console if you want. then s an option a on-off switch to one of the pot's wires so that you can disable the pot and return the car back to normal mode. also, once you have the pot dialed in, you can simply remove it and install a resistor in its place which has an identical value of resistance. a on-off switch also works with the resistor.
this frees up the pot to be used on another sensor, such as the map, iat, or maf, etc.

fooling around with a pot anbd the iat has a similar effect of advancing the ignition timing when you fake the computer into thinking the air is colder then it really is. it has a negative effect of watcing to add more fuel when you make the iat read cold, but the throttle position sensor that i previously lowered its value counteracts this. also the o2 sensor will not let the computer add more fuel soi the intake air temp sensor is also a good mod to do.

i have tried adding a pot to the map sensor, and this also effects timing and fuel but the computer quickly (in a matter of 2-4 seconds) relearns and works around the fueling change with the map sensor. this also has the effect of undoing any changes to the ignition timing that was made by changing the value of the map sensor. so for me at least, map sensor is not worthwhile mod.

what i have doscovered is that you can not perminantly alter any fueling tables by changing the value of any engine sensor. (with the exception of open loop mode such as a cold start). you can only change the ignition timing and transmission shift points.