GMT 900 Trucks General Discussion 2007 - 2013 Trucks | General Discussion

2008 2500HD dynoed

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Old Sep 28, 2011 | 02:55 PM
  #11  
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That's pretty good tq bet it runs a lot better.
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Old Sep 28, 2011 | 05:12 PM
  #12  
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Its a day and night difference. The first run i did a few years ago was all stock and it put down about 290hp and 306ft lbs to the wheels, so you can only imagine what it feels like now
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Old Sep 28, 2011 | 06:07 PM
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thats a pretty wild looking HP curve
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Old Sep 28, 2011 | 06:50 PM
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That's 67rwhp from intake, cat delete, tune, and exhaust.
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Old Oct 6, 2011 | 12:12 PM
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That is impressive. I traded my '04 HD for a '08 last week and the power/acceleration is tons better. Mine just has a muffler on it and it will blow my '04 off the road. I'm thinking a CAI & tune will really wake it up.

Are you running premium fuel or regular? Think I'll run premium for a while and see how it does, since 9.67:1 is kinda getting up there.
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Old Oct 6, 2011 | 12:52 PM
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Premium will do absolutely nothing for your truck unless you are tuned for it. You may actually pass more unburnt fuel if you go with a higher octane than necessary because the flash point is higher and you have neither the timing nor compression to take advantage of it. This could hurt your power or mpgs, worst case scenario, plus you spend more per gallon for zero gain. Now with a tune it's another story.
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Old Oct 6, 2011 | 01:30 PM
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Was that a third or fourth gear pull ?
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Old Oct 6, 2011 | 02:33 PM
  #18  
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Eleventh
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Old Oct 6, 2011 | 08:42 PM
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Yah I only run 93 octane now. The truck was dynoed in forth gear. In curious though, how would that affect the results? Would they be higher or lower ?
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Old Oct 6, 2011 | 08:49 PM
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3rd would be lower.
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