Installed Fast 90 Now Car Idle Sucks
04-19-2006, 05:57 AM
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Installed Fast 90 Now Car Idle Sucks In My H\c Trans-am I Did A Fast 90 Setup Now My Car Is Alot More Prone To Stalling And Surging
What Tables Do I Need To Adjust In Hp Tuners To Fix This Problem ??
What Tables Do I Need To Adjust In Hp Tuners To Fix This Problem ??
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04-19-2006, 12:32 PM
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I believe the problem comes from the idle airflow vs
IAC counts, this is what has been changed as far as
idle airflow loop is concerned. People just shift the
data left or right but I think really you want to look
at the size of the passage as well, and the diameter
of the IAC plunger seating circle, and see whether
you also need to scale values.
The running airflow on that car should be no different
across a manifold/TB swap. But changes to how much
air a perturbation to the IAC position makes, is likely
changed. There have been some discussions about that
which you should be able to chase down, though in my
recollection they stopped kind of short, of a solid recipe.
IAC counts, this is what has been changed as far as
idle airflow loop is concerned. People just shift the
data left or right but I think really you want to look
at the size of the passage as well, and the diameter
of the IAC plunger seating circle, and see whether
you also need to scale values.
The running airflow on that car should be no different
across a manifold/TB swap. But changes to how much
air a perturbation to the IAC position makes, is likely
changed. There have been some discussions about that
which you should be able to chase down, though in my
recollection they stopped kind of short, of a solid recipe.
04-20-2006, 07:51 AM
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the only thing tsp changed was base air flow .. i drilled the blade hole a few sizes bigger this morinng as advised and now all is good .. car idles well and runs pretty well now and ten it still catches it self but no stalls
04-20-2006, 10:41 AM
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Not unless they fixed them, the Fast 90 TB is junk. Do a search, there has been countless threads talking about idle issues with them. A return spring helps, but I think it boils down to it being a bad design from the get-go.
