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Drives

Found 10 results

  1. Need some Dyno expertise. I am used to manuals and this is my first time dynoing an automatic. Because of the 95 mph limiter on the truck (due to the weak drive shaft and probably the tire speed rating), the dyno tech said that the stock truck won't hold 4th so he is forced to do a 1st through 3rd pull. He will then do the same thing after my modding and tuning so I can see how much more power is made (this was a baseline tune). Because of this, the dyno was graphed vs MPH instead of RPMs and I am not sure how to calculate my actual HP because of the gearing (I believe for the 6L80 the gearing is as follows: First: 4.03. Second: 2.36. Third: 1.53. Fourth: 1.15. with 4th being the closest to a 1:1?). Is there an accurate way to pull out the actual power numbers from the MPH graph since it is graphed vs MPH instead of RPM (65 to 95) while accounting for the transmission gearing and rear? The Dyno Graph is attached. Thanks for the help!
  2. Hey Forum - Do any of yall have results from running your L83 on a dyno? I plan on doing a Black Bear tune soon and was going to do before/after dyno results. Curious if anyone has results to post here that I can compare to. My truck is a 2014 LTZ Z71 with the 5.3L and 3.73 gears (9.5in rear end) from the Max Trailer Tow package. I have a K&N CAI and a custom dual exhaust where the muffler and resonator were deleted. FYI: I was reading this thread earlier. My truck is currently governed at the stock limit of 100mph. So, I assume it would still be safe to take on the dyno. https://www.gm-trucks.com/forums/topic/198544-dyno-tune-driveshaft-cannot-handle-115/?page=1
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