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Old 11-30-2004, 06:32 PM   #1
Matrix 1193
Scooby Newbie
Member#: 68286
Join Date: Aug 2004
Chapter/Region: SCIC
Location: Westlake Village, CA
2006 WRX STI
Pearl White

Default funny idle oscillations on Hydra

The car is a 02 WRX with Helix Up/Dp Espelir Catback
Runnin the hydra+ UEGO

I am having some issues with the ISC, sometimes it idles right on the mark at just under 1k but then sometimes and I can't tell what causes it to wander periodically from 1200 to 800, it kind of just goes back and forth rhythmically. I read the manual so I already know how the hydra interprets PID. I am just looking for what people run for these values, i just have nothing to compare my experience to.

P 115
I 115
D 40

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Old 12-01-2004, 10:54 AM   #2
Element Tuning
Former Vendor
Member#: 54918
Join Date: Feb 2004
Chapter/Region: MAIC
Location: Gaithersburg, MD
673 WHP Element
Tuning Pro Comp Engine


Read this section on "Idle Control" if you haven't already http://elementtuning.com/technical/e...ningguide1.htm

Your proportional looks to low which will result in less active closed loop idle control. Set it to 175 for now.

If this doesn't help, your fueling needs adjustment as the ecu extrapolates between fuel cells. The best way to adjust this is with "Closed Loop" turned off. Simply adjust the idle cell and 4 surrounding cells so they are very close in AFR. Don't tune it to 14.7:1 but instead 14:1 and let the closed loop system adjust the fuel from there.

Good luck,
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