Sled pull ? - Diesel Truck Forum -
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post #1 of 6 (permalink) Old 08-15-2007, 10:49 PM Thread Starter
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Sled pull ?

I was just wondering why at the end of each sled pull as soon as they stop, they rev it up alittle?? only thing i can think of is to help burn all the extra fuel left after a wot run. ?? just something i was thinking about.

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post #2 of 6 (permalink) Old 08-16-2007, 01:42 AM
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Ya I was kinda wondering that too but I always thought it was to slow the turbo down a little slower so it dont bark real bad? But iam not sure
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post #3 of 6 (permalink) Old 08-16-2007, 02:11 AM
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They do it to help bring the boost down slowly, than just letting off the throttle and barking like crazy. Especially with how big of turbos most sled pullers run.

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post #4 of 6 (permalink) Old 08-16-2007, 04:09 AM
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To keep it from cutting off. Goin from full boost to no boost immediately, will cut the air off to the engine and it will stall. Atleast thats what it seems like my truck does. Ive had it happen to me a couple times, both times I was pulling. One was sled pull, other was a tree in the backyard. If I would hold it down for a short while, then let up real quick it would bark then cut off. Hold her down, let up quick, then tap it alil, it wont cut off. That was just with an exhaust system, no tuner then.

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post #5 of 6 (permalink) Old 02-04-2008, 11:28 PM
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if the sled brings you down it will loud the mtor too much and the turbo cant spool that way either so if u rev it up at the quickly enough you can keep it from stalling.
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post #6 of 6 (permalink) Old 02-06-2008, 02:56 AM
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On my truck, and I guess this applies to most Duramaxes, The converter will be locked in 4th gear at the end of the pull. If you let off the pedal and don't go to neutral the motor will stall. Not good for the turbo bearings as the oil pressure stops feeding the turbo and what oil is on the bearings, cokes up pretty fast with all the heat present. JMO
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