Quote:
Originally Posted by CorneliusRox
I personally think you're dead on with starting at 10deg advance.
The lowest a stock 12V had was 12deg I believe, and that was obviously a compromise so it still had some power all the way up to it's 2600rom red line.
I'd probably start at 10deg idle, and do a linear timing progression to 32deg at 4000rpm. Then start tweaking it.
You also have to figure out, or keep in mind, that your injection event is likely different than the p7100 pump, and is definitely different than the common rails.
A lot of the advance timing on 12mm pumps at higher rpms is to make up for the slow injection event. If you had the data to show the middle of the injection even on a 12mm p7100 pump at 4000rpm, I bet it'd be a good 5-10deg retarded than where you set it. Does that make sense? It's definitely a little wordy
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Yes it makes sense. I see what you're saying, but I'm not sure I agree with you. Having said that, it's always good to consider dissenting opinions; especially from a fellow mechanical engineer. I guess a good place to start would be find out what max timing is on a performance common rail tune that does not make use of pilot injection. Anybody want to contribute that info?
BTW, the curve you've suggested is exactly what I plan to do. (Great minds think alike!)
