DUEL Maps On A Delco ECU???

[defa]

i was reading on ebay and geoff whyte is selling his v6 turbo wagon. in the description he says he has duel maps at the flick of a switch. now rather than bothering him.. does anyone know how to do this??? i would be quite interested to know how to do it. then when i burn an eprom (when i learn a little more) i could burn two at a time and then go out and test the two on one test drive..

[Not_An_Abba_Fan]

He doesn't have 2 ECU's does he?

[defa]

well i did think that. but i thought there may be an easier way of doing it..

[Doctor Bob]

stacking different images on one eprom, larger than the original unit, then switching the used segments of the eprom

[hakhawk]

as bob said, me and a few others were playing with it, you get a eprom that holds more data, enough for 2 tunes, then u switch a certain pin between ground and 5v to swap between the tunes, worked ok, but for the average commo, it wasnt worthwhile, just run a vr tune with leancruise and have your main maps as crazy as you want.

using 2 maps, you can also have one as a safe medium tune to switch to if the car starts pinging like crazy or something on the "test" tune, when you're tuning yourself.

[defa]

so for a vn ya use a 256 or a 512 eprom??? is that right. then how do you go about switching them over from one to another??

[hakhawk]

correct, then you just have to run the a15 i think pin(last a## pin on the eprom) to a switch that connects it to ground or positive 5v.

id have to find all my info i had on it, though im sure theres also a thread somewhere for it too.

[defa]

maybe i should do a search then ask a few more questions..

[defa]

i did a search and 497 threads came up. i tried different things but still 497 threads. so if anyone knows where a thread is on duel maps let me know.

[hakhawk]

try searching those words with me as a thread starter or poster, try same with greenfoam and vl400

i cbf searching atm

[defa]

well i found the thread, and i sort of understand what to do. i think i get the bit about stacking the bins, but as for switching i will have to learn a little more about it all first..