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Ignition retarding for nitrous.

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Hey guys. So I have a 2000 Ford Mustang GT and I swapped a 5.4L DOHC into it whereas the car comes stock with a 4.6L SOHC engine. I'm planning on throwing some nitrous at it and from what I understand you are supposed to retard the ignition timing while spraying because it burns faster. My question is how do I do that? Nobody makes a plug n play ems for that car that I know of. Is there a piggyback ignition system with auxiliary inputs and outputs? How do I go about doing this? I don't want to get a whole new EMS and wiring harness and wire it if I don't have to. I suppose I could create a tune for nitrous but then it's going to retard the ignition even when i'm not spraying. Any thoughts?

You're right, you do need to retard the timing if you are running nitrous - It's really no different than tuning for a boosted application. The usual rule is 2 degrees per 50 hp shot which in my own experience has always been reasonably close. For the first runs I would tend to remove a little extra timing for safety while you are getting the fuel delivery dialled in.

Now as to how you can make this adjustment, this is a little trickier. The easiest way is with a complete standalone ECU which offers a nitrous function. Understandably this might not be a very appealing option as it adds expense to the job, however it will give complete control which is important. I'm not aware of any piggyback modules that would be suitable for this application unfortunately.

Hi There Have a look at MSD they do some products to suit.