PCM Diagnostics & Tuning HP Tuners | Holley | Diablo

efilive converting to speed density

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Old Jun 25, 2008 | 01:37 PM
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Default efilive converting to speed density

I am converting my car to speed density and have a few questions.
the first is about the c6101 table. The efilive manual says this

"When going MAFless and/or boosted on vehicles with Electronic Throttle Control, you will most likely need to increase {C6101} ETC Predicted Airflow, by significant amounts to stop the PCM from going into reduced power mode."

My whole table is set to 2100 miligrams per cylinder. Does anyone have a suggested amount for a significant increase?

The second question I have is about the 3bar map sensor. I have a gm one but heard they aren't as linear as some of the others. Does anyone have a recommendation on a 3bar map.
Thanks for you help guys.
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Old Jun 25, 2008 | 03:17 PM
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Basically the ETC airflow needs to be increased especially if you expect more airflow than stock. Probably roughly if you are aiming at a 30% increase in power, increase the table by 40% (10% margin)

As for the map sensor. They all read 0-5V so a 1 bar will have 3x the resolution of the 3 bar. But TBH if you set it up properly it should be fine. If you dont need 3 bar, just get a 2 bar for the above reason.
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Old Jun 25, 2008 | 03:25 PM
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Ringram thanks for the quick reply. I figured it was something like that so I had changed it by 50% on a guess. Just to let you know the car is a '03 Z06 with a cam and a rear mount twin turbo setup. I also will be turning the methonal kit back on once I get comfortable with the tune. I am still learning how to tune. I just follow my wideband and make small changes. Let me know if you have any other tips. Thanks again.
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Old Jun 25, 2008 | 04:08 PM
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If you don't increase the predicted ETC airflow table enough you'll end up going into reduced power mode. Increasing it keeps you from setting that condition.
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