Somewhat incorrect... there is a way to program the stock ECU - the problem is that it is not easy and requires soldering to get the programmable parts on the ECU. (oh, and anybody that knows how to re-tune the stock ECU won't tell you the secrets! )
-Charlie
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2003 Impreza WRX Wagon 5spd - 2.2L stroker + other goodies
1989 Camry Alltrac LE 3S-GTE 5spd - SV25/ST205 hybrid
1990 Camry 3S-GTE 5spd - parted out / junked
1990 Camry DX 3S-FE 5spd - The original white90dx; gone but not forgotten
its quite possible to reprogrma the stock ecu.. if you were a freak of nature and know toyotas programming and could make an interfacce to read/write to it
youd be a GOD here too
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125 front wheel horsepower with major retard issues between 4500-5200RPM -
OD switched off, even when not in 3rd results in major power loss/rpm drop.
^Most of those CPU use one time write EPROM. So once its programmed, you can't change it. You can add a circult to redirect the memory address for fuel and ignition table to an external memory, ie the TechTom.
now.. can i change what i said and say that "ECU" means the little grey/black box as a whole?
:P
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125 front wheel horsepower with major retard issues between 4500-5200RPM -
OD switched off, even when not in 3rd results in major power loss/rpm drop.
Yes, we can change everything inside and keep the box but its not "stock" anymore
I'll take "like stock"
I believe he's looking for those OBD programmer that is available for domestic cars.
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125 front wheel horsepower with major retard issues between 4500-5200RPM -
OD switched off, even when not in 3rd results in major power loss/rpm drop.
^Most of those CPU use one time write EPROM. So once its programmed, you can't change it. You can add a circult to redirect the memory address for fuel and ignition table to an external memory, ie the TechTom.
If its called an "EPROM" then u can "Erase" and "Program" the "Read Only Memory", right?
If its called a "ROM" then its programmed once, like at the lab that the ECU's are assembled.
So, when the ECU is refered to as having an EPROM, then u are able to program it, so long as u can get it off the circut board, connect it to your PC, and then have the right values to do the big program mod.
This is for NOOBS to understand, not to be rude to Pineapple.
for the record, most EPROM isnt user re-programmable. To reprogram an EPROM you need to remove it from the board and flash it, sometimes a light is used for this (the chips have a clear window on the top, covered by a label) , or some specialized equipment.
what you are referring to is EEPROM, or electronically erasable programmable read only memory. this is the stuff that you can just flash with new data by plugging in your laptop etc, and this is the stuff that we would like to have running in our cars because its easy to play around with
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