Join Date: Aug 2007
Location: Tulsa, OK
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Here are my results from all three gears:
3rd: 247.12 whp, (no torque reading)
4th: 251.72 whp, (no torque reading)
5th: 255.35 whp, 237.91 lb-ft
I'm not sure if the STD smoothing factor really modifies the results much further than smoothing out the variation in the curve and eliminating a bit of the noise and statistical outliers. I know that at one point, my torque reading was at 300, but he eliminated that as an outlier (which it was, looking at the trend of the curve). The fact that he was still insistent, after it all, that the 5th gear wasn't 1:1 (he pointed to the relative roughness of the curve as an indicator) leads me to think he wasn't inclined to really fudge those numbers in my favor.
Now the STD factor listed at the bottom - which may be what you're actually referring to - is a mystery to me. A value of 0.98 seems like it would reduce the number. My best guess, given that I don't know nearly as much as a lot of you guys on the forums, is that it was a reducing factor in this instance because it was a bit cold. But like I said, it's just a guess. I don't necessarily know how they do some of these things.
"STD" is the correction factor. Your "smoothing" is set to 5, which is the industry norm. I set it on 5 when testing for a number and set it to 2 when tuning. At .98, the CF is reducing your number slightly. however, the SAE correction would probably lower it a bit more (SAE numbers are always a little lower than STD, this is why shops use STD). Despite what your tuner told you, 5th is 1:1 in the Z. In cars fitted with a T-56 or Tremec 6060 6-speed ('Vette, F-Body, Cobra, Viper, etc...), 4th is 1:1 because they have a double overdrive.
Based on your 4th gear numbers, I'd say you're probably right around 246-247whp SAE. Those are still very good numbers though. My car has bee de-modded to where I only have a CAI, full exhaust and pulleys and I just made 248whp with my oil consuming '06 6-speed. I have more mods, but I'm also burning oil, so us being pretty equal in the power dept. leads me to believe your numbers are pretty accurate in 4th gear.
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