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If you are getting your ecu chipped by telion, I highly suggest a moats two timer.
This will allow you to run two maps on the ecu. One for N/A, and one for Nitrous. THere is a wire that comes from the two timer. You wire this up to your nitrous switch. When the nitrous switch is flipped to activate the nitrous, it will switch over to the F/I map.
THe N/a map has advanced timing with fuel taken out.
THe F/I map will have retarded timing and added fuel depending on the size shot you're going to use, 75 in your case. With a 75 shot, 2 degrees retarded should be what you want it programmed at.
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