Dumb Question...... What is shift flare ??????? - Diesel Forum - TheDieselStop.com
'99 & up Upgrades and Aftermarket - 7.3L Engine Upgrading or adding OEM or aftermarket equipment to your 1999-Up Super Duty or Excursion with 7.3L Power Stroke diesel engine. Please confine discussion of topics in this forum to those items that are specific to the 7.3L Power Stroke engine.

 
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post #1 of 3 (permalink) Old 08-01-2006, 04:39 PM Thread Starter
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Dumb Question...... What is shift flare ???????

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post #2 of 3 (permalink) Old 08-01-2006, 06:03 PM
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Re: Dumb Question...... What is shift flare ???????

Watch your RPMS when shifting from second to third and third to fourth. You will see the shift and then watch the rpms slowly drop until the TC lockup fully occurs. It is about a 3-400 rpm swing. You are still accelerating, but the TC lockup disks are slipping and creating heat, all the while wasting fuel.

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post #3 of 3 (permalink) Old 08-02-2006, 07:49 AM
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Re: Dumb Question...... What is shift flare ???????

Shift flare is when the RPM briefly increases on an upshift. RPMs should always decrease on an upshift.
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  Diesel Forum - TheDieselStop.com > 1999-2007 Ford Super Duties > '99 & up Upgrades and Aftermarket - 7.3L Engine

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