Major idle help
02-26-2006, 07:26 PM
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Major idle help Any help is greatly appreciated with this... Here is the brief list of what's up.. 2004 gto, heads cam, etc.. Everything was tuned pretty good. I then added a 90mm fast intake ported, 90mm nick williams tb, and svo 30# injectors. I used the excel file posted on here to calculate the new injector numbers for the flow rate vs kpa table. The new numbers I got were: 41.79166 42.10168
42.34971 42.59773 42.84575 43.09377 43.34179 43.58981 43.83784 44.08586 44.33388 44.58190 44.82992 45.07795 45.32597 45.57399 45.82201. This was the only table I changed.
Now, as soon as I started the car, it was idling around 1500rpm. A bit high. Then, it went to 2600-2800rpms.. The only thing I get from the data is that as soon as the spark goes from 1.5 to 24, this rpm changes. The tune is a SD open loop tune. Before this tune was loaded, the car idled fine, other than being very very rich. I would assume it is the injector settings throwing it off, but why and how do I fix this? Thanks..
42.34971 42.59773 42.84575 43.09377 43.34179 43.58981 43.83784 44.08586 44.33388 44.58190 44.82992 45.07795 45.32597 45.57399 45.82201. This was the only table I changed.
Now, as soon as I started the car, it was idling around 1500rpm. A bit high. Then, it went to 2600-2800rpms.. The only thing I get from the data is that as soon as the spark goes from 1.5 to 24, this rpm changes. The tune is a SD open loop tune. Before this tune was loaded, the car idled fine, other than being very very rich. I would assume it is the injector settings throwing it off, but why and how do I fix this? Thanks..
02-27-2006, 07:30 AM
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More like your RAF table needs redoing for the new TB.
Look into Idle tuning, your injectors if done right should be fine.
Check your TPS as well, make sure blade is closed at zero TPS etc.
Log airflow and see if its too high, you might need to drop flow down at idle.
Look into Idle tuning, your injectors if done right should be fine.
Check your TPS as well, make sure blade is closed at zero TPS etc.
Log airflow and see if its too high, you might need to drop flow down at idle.
02-28-2006, 08:20 AM
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Thanx... It was the throttle blade.. I assumed they set the idle set screw to be correct, but it was not. It turns out the screw was off at least 6 or 7 full turns and in turn was pulling the throttle cable just enough.. Now, I just have to fix the cruise control problem..