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Originally posted by ForceFed420a
Okay guys, I was talking to a buddy of mine who's quite familiar with turbododges. He was saying how I can't part throttle boost (max 8psi on stock internals) because the spark curve will be too aggresive. Apparently, on TD's there's a spark map for part throttle, and a map for full throttle. The part throttle is more aggresive. In other words, the spark timing is based on MAP AND TPS. Now, the question: Can we part throttle boost? Do we have two seperate timing curves? Is timing based solely on MAP sensor? Also, in the future, I'll get upgraded internals. I was wondering what to do about timing for that when I get there. Is it required once you go above 8 pounds to pull timing? If so, I know there are options, like the MSnS (how are people doing with that anyways?) There's also the Crane option with the trigger and MAP proportional retard. Are people having success with that? Help me understand some of this stuff. As always, your opinion is appreciated. Brian
Yes, the timing curve is different in open loop mode vs closed loop mode (open throttle vs partial throttle). Above 80% throttle is considered to be wide open throttle as far as fuel and timing are concerned. You will get more timing advance under partial throttle, and even more advance if you are using the safc for a lean correction. It is a legitimate concern boosting 8 psi at partial throttle, but it has been proven time after time that it is safe with the proper amount of fuel being added. However, with the safc making fuel correction on top of that, I would advise against it on a stock bottom end.
As for your question about when do you need to pull timing on a stock ignition, that is not necessary until you get to around 17 psi on pump gas. I have been running 16 psi daily on 93 pump gas for almost 3 years now without an incident (I do not alter the MAP voltage at all though). I also run 26 psi on 110 on occasion with no knock. You can pull some timing if you want to when using stock internals to help reduce the risk of damaging pistons, but you may as well just run less boost. Matt
1995 Eclipse GS
2.0L, S16g Turbo, 8 Injectors, 26psi
1998 Eclipse GSX
2.3L Stroker, AEM EMS Converted to Speed Density, FP3065 Turbo, 35psi , and so on...
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