Eprom/Memcal Swticher

[markER717]

Hey guys, I'm looking to run an eprom/memcal switcher on my car, to run dual fuel. I have a manual v6 commodore and I want to, when I flick the gas switch to change eprom/memcals to the gas one, and when vice versa, anyone done this before? would it be that hard?

 

[Circlotron]

These guys can help you --> delcohacking.net • Index page

 

[Jxfwsf]

quite easy to do, what you want is called bank switching.
double the size of the eprom, stack the 2 bins you want to use into 1 file and burn it.
you'll need to isolate the pin you are using to switch the banks and solder a 4.7K resistor between the pin and a positive source to pull it high.
solder a wire to this pin and run it to your switch and ground the other side of the switch, this will give you 2 banks


as there are a few choices of eprom size depending on what bin you are basing it all on and what address pin (A14, A15 ect) you will use to switch.

the pic below shows how to achieve 2 x 512KB bins for an auto VR, never got around to finishing this project off but the idea was to run 2 completely different maps for pwr and eco modes instead of just changing trans parameters like the stock memcal does.