between Precision and Accuracy.

A good example is that if you're shooting darts and land all 3 on the outside ring of the 19 section but you're really aiming at the bulls eye, your set of shots as a group was highly Precise, but not Accurate. If you land all 3 in the bulls eye, then that group was both Precise and Accurate. Or if you've drank too many beers and hit all over board, then you're neither Precise nor Accurate. :)

So I'll cede the point that various dyno shops may be Precise, but not necessarily Accurate when compared to a known standard. To definitively gauge the accuracy of a particular dyno you'd need a fairly large sample group of tests for comparison, or some other way to quantify and verify those results, like 1/4 mile times for example. But again, how close is close enough? I'd bet that Accuracy within +/- 7 or so peak HP would probably encompass what we're talking about here. Unless, and I'm seriously asking here, not trying to be a smart-alick, you (or others) have some direct experience that would suggest otherwise?

The sure thing, SAE correction has to be a multiplier. I don't know for sure if it's linear, but that correction isn't just some pie in the sky number or equation. As you noted, it's based upon the various environmental conditions: at that shop, on that day, at that time. That's the whole point of calling it a standard correction factor. And the whole point of going through that correction trouble is to try as best as possible to make it so that nickR and I can go on some chat board and brag about how much HP our cars make, and make it so that those numbers actually mean something. :)

So what king of HP does your STi make at the wheels? I've seen a bunch of numbers for them, and to run a stock 13.2 1/4 mile takes more than 300 crank HP dosen't it? Have you done any racing yet? I've owned and loved 2 Subaru's in the past and have nothing but respect for those machines--I can say for sure that they were a heck of a lot easier to work-on than my Saab is.

Since you're in the NE, you should check-out the link below. I'm taking a few days for a road trip and will be there with my 9-3 if you're looking for something to do on July 9th-10th. It's a great time!

posted by 67.10.24...

Good Times and a Blues Festival

• JR Filter and JT Full 3" Exhaust Dyno Results!, Drew in Houston, Fri, 25 Jun 2004 14:10:34
  • Re: JR Filter and JT Full 3" Exhaust Dyno Results!, Dean, Sat, 26 Jun 2004 08:51:42
    • Re: JR Filter and JT Full 3" Exhaust Dyno Results!, Drew in Houston, Sat, 26 Jun 2004 09:04:26
  • is that at the wheels?, nickR, Fri, 25 Jun 2004 16:39:46
    • Yes, at the wheels, Drew in Houston, Sat, 26 Jun 2004 05:52:53
      • delivery pipe, ed smith, Sat, 26 Jun 2004 07:18:34
        • Wow, Drew in Houston, Sat, 26 Jun 2004 16:38:46
          • Re: Wow, ed smith, Sun, 27 Jun 2004 18:38:53
            • Re: Wow, Tim, Mon, 28 Jun 2004 10:40:36
              • Re: Wow, ed smith, Mon, 28 Jun 2004 12:12:27
            • Actually, what I was thinking-about was the fact that, Drew in Houston, Mon, 28 Jun 2004 00:27:27
        • Re: delivery pipe, Dennis, Sat, 26 Jun 2004 10:18:44
      • very easy to know, what boost?, nickR, Sat, 26 Jun 2004 06:17:17
        • Re: very easy to know, what boost?, serendipity, Mon, 28 Jun 2004 13:48:59
          • No way a stock SRT4 will break into 13's not here in, Drew in Houston, Mon, 28 Jun 2004 15:11:02
            • Re: No way a stock SRT4 will break into 13's not here in, serendipity, Tue, 29 Jun 2004 05:32:17
              • Point taken, you're talking about the difference, Drew in Houston, Tue, 29 Jun 2004 06:17:03 <-- Viewing This Message
                • Exactly, serendipity, Tue, 29 Jun 2004 09:56:42
                  • Ok, you've convinced me. From now on I'll have to, Drew in Houston, Tue, 29 Jun 2004 10:16:18
        • How to tell boost? Get a gage I guess..., Drew in Houston, Sat, 26 Jun 2004 06:27:28
          • Re: How to tell boost? Get a gage I guess..., serendipity, Tue, 29 Jun 2004 05:36:57
            • Yep, and the JT pipe has a 3rd bung already installed, Drew in Houston, Tue, 29 Jun 2004 06:29:56
          • gage mounting, ed smith, Sat, 26 Jun 2004 11:19:57
          • me neither, nickR, Sat, 26 Jun 2004 07:29:00

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