Second gear power
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Joined: Nov 2008
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Second gear power
Seems I read about this here once but couldnt find it during a search, why is there a power reduction when manually shifting our automatics to second gear? I seem to remember something about it being useful in low traction conditions, but it really bugs me. At times I drive in hilly areas and like to hold second gear but the power just isnt there. I was wondering how this power reduction is achieved and can it be bypassed? I have tried the PHP forum since I have a Gryphon programmer but to no avail. To anyone who doesnt know what I'm talking about try this, start out manually shifted in second gear. Get on the throttle a little then shift up to drive, the truck takes off. The gryphon tells me its not going to first for this increase in power, nor is it a torque converter thing. I'd sure like to defeat this "feature".
MMNC (SS)(Ret)
Joined: Mar 2004
Posts: 11,606
Likes: 151
From: SE Georgia
1st and 2nd gear positions cause the PCM to remap the throttle
essentially the throttle gets cut in 1/2 by placing the shift lever into 1st or 2nd. the throttle then is more "sensitive" and you have better control of the wheels.
this is achieved because you now have full pedal travel to control only 50% of your normal throttle...so you don't inadvertently spin the tires by giving it too much gas
it's a little known feature to help you control low speed situations. like boat ramps, towing heavy loads, 4x4 offroad
essentially the throttle gets cut in 1/2 by placing the shift lever into 1st or 2nd. the throttle then is more "sensitive" and you have better control of the wheels.
this is achieved because you now have full pedal travel to control only 50% of your normal throttle...so you don't inadvertently spin the tires by giving it too much gas
it's a little known feature to help you control low speed situations. like boat ramps, towing heavy loads, 4x4 offroad
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cbd1
1999 - 2003 7.3L Power Stroke Diesel
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Oct 8, 2009 12:58 PM
