Chevy/GMC Duramax 01-04 LB7 Discussion of Chevy and GMC Trucks with LB7 Duramax Turbo Diesel Engines

RPM limits

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Old Feb 20, 2010 | 02:54 AM
  #1  
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Default RPM limits

whats the highest rpm you can take a stock motor to without blowing it up.was woundering if a stock D-max would turn 4,000-4,500 rpm or would it blow
 
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Old Feb 20, 2010 | 07:52 PM
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it can turn that fast, idk if the springs can take that much rpm for long periods of time , but i have ran mine up to the high 4000's several times goofing around on wet roads
 
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Old Feb 20, 2010 | 08:07 PM
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idk but the turbo makes a cool noise if it gets up there bark!
 
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Old Feb 21, 2010 | 07:44 AM
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ok so i could set the rev limited to say 4,000 rpm and it wouldnt blow the motor or hurt the turbo?whats the hights RPM any1s herd a stock motor turn? what are some of ya'll limter set at?
 
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Old Feb 21, 2010 | 08:10 AM
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I'm sure mine has seen 4500 or better, but not under a load. Stock valvetrain won't last above 4k.
 
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Old Feb 22, 2010 | 12:08 AM
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4500? thats rolling pretty darn good, a stock motor could handle 4000k for a few seconds at a time, but sustain it and your gona need a big magnet to pick up all the pieces.. LOL my LBZ stock spins 3500k, sounds pretty gnarly when its rolling that fast, 4500 would be wild
 
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Old Feb 22, 2010 | 12:16 AM
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yup it does

i dont have a log but ive shot up to 5k once
 
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Old Feb 22, 2010 | 09:59 AM
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Man I get scared when mine goes past 3200 sometimes under load... I can't imagine seeing 4000+rpm on that engine.
 
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Old Feb 22, 2010 | 11:14 AM
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they almost sound like 2 stroke detroits at 4500.
 
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Old Feb 22, 2010 | 06:50 PM
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I like when mine puts you in your seat without a high rev... When i'm at 1800 rpms and it's about to break loose, is a good feeling... but, then again my tranny doesn't like the high rpms either... the clutch likes to hang up
 
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