SD and nitrous
01-07-2006, 03:49 PM
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SD and nitrous I use HPTuners and I currently have the MAF sensor unplugged and I am just running in a speed density mode. I do not plan on plugging the sensor back because the car runs fine without and I am not interested in tuning the MAF table. My question is about spraying on this SD tune. It is a wet shot obviously, considering the lack of a device capable of measuring the extra air. I can't think of a reason why it should matter in any negative sense, but some feedback would be appreciated.
01-07-2006, 05:49 PM
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The other thing you don't get, is the "free timing pull"
that you'd get from the MAF sensing higher air mass
(MAP knows nothing about cols, wet shot is aft of the
IAT, so it's all a mystery as far as the PCM is concerned).
Might look at the timing end before you go for a big shot.
that you'd get from the MAF sensing higher air mass
(MAP knows nothing about cols, wet shot is aft of the
IAT, so it's all a mystery as far as the PCM is concerned).
Might look at the timing end before you go for a big shot.
01-07-2006, 06:42 PM
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Thanks jimmyblue for the insight on timing. What are your thoughts (with my current modifications) on me running a 150 shot with race gas? How should I approach messing with my timing? Logging with the histogram?
01-07-2006, 07:16 PM
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My car is in SD and I spray iit regularly. If it is a wet shot, you don't need a MAF. As far as timing - you have to pull it (either in the tune or with an external device - i.e. timing tuner) for a wet shot anyway - the MAF won't help you pull timing on a wet shot even if you have it in use. And without the MAF, the PCM uses calculated grams/cyl to determine where to be on the timing tables.
Since you have HP Tuners, you can just make up a nitrous tune to use when you want to spray it - pulling some timing. You can run it all of the time if you want, you'll just be down a little power on the motor from the lack of timing.
Since you have HP Tuners, you can just make up a nitrous tune to use when you want to spray it - pulling some timing. You can run it all of the time if you want, you'll just be down a little power on the motor from the lack of timing.