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Scion tC 1G Forced Induction Turbo and supercharger applications...

NA AFR Readings

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Old 01-01-2010, 03:34 PM
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Default NA AFR Readings

*If this needs moved, please do so. I assumed more responses in FI section*

So I have a turbo kit coming soon. To save some hassle, I went ahead and installed my UEGO and boost/vacuum gauges.

Here are my "stock" readings, was curious if anyone else was in this ball park

Idle ~15.3-15.5
Cruise~14.2-15.5(bounces a lot...normal?)
WOT~12.5(works its way to 12.5 near the upper RPMS) but it also seems to "accept" 13 as well. Haven't made a lot of runs yet to see

Also I have noticed under medium accelerations is when the AFR is most stable. cruising that thing is none stop bouncing...

Has anyone else taken data on thier NA tc?
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Old 01-01-2010, 04:22 PM
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I've done MAF and O2 voltage data logs with an F/IC on a bone stock 2009 to help with tuning. The bouncing is relatively normal.
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Old 01-01-2010, 05:50 PM
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I've noticed that car tends to lean towards the lean side, same for your case?
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Old 01-01-2010, 05:53 PM
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seems about right. that is where my tc was when it was supercharged roughly. but your stock a/f's should be fine since they were tuned by toyota. only way your readings would be off is if the o2 sensor for the a/f gauge was misplaced and getting a bad reading.
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Old 01-01-2010, 06:11 PM
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Yeah I'm sure its not wrong, i just wanted to compare with anyone else who had done it.

I put the Wideband in the Spipe, before the 2nd factory O2. Sound right?
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Old 01-01-2010, 06:14 PM
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Were your wideband mounted..

Stock header?
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Old 01-02-2010, 03:10 PM
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Before the secondary O2 is just fine. No airflow complications if there isn't a sensor right in front of it.
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Old 01-02-2010, 03:40 PM
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Originally Posted by rangerryda
Before the secondary O2 is just fine. No airflow complications if there isn't a sensor right in front of it.

But if he has a stock header this can and will throw off readings!
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Old 01-02-2010, 03:54 PM
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No I have a megan Header...MY stock one is pretty much shot...

Plus I'm going turbo soon... So this seemed like a logical place, far enough from too high of temps according to AEM?
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Old 01-02-2010, 05:07 PM
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You could be as close as the primary O2 sensor in actuality but for a longer sensor life (negligible) it's recommended to be put farther away. I have mine in the very beginning of the mid pipe because my S-Pipe was going to be changed out soon when I got the bung welded in.
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Old 01-02-2010, 07:45 PM
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I just went with what the AEM instructions said. they call for 36 inches if turbocharged, so i guesstimated, and threw it in where it was easy to get to...

I think it will be fine though...
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