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Originally Posted by Dean
Please descibe how on a dyno you would simulate a lap at Laguna Seca, Thunderhill, or even Fernley at 12PM tomorrow. Please incluide all data including track surface temperature at all points of contact, and tire temperature/pressure on each revolution at each point on each tire, air temperature, air speed, and direction, humidity, fuel load, conerweights on each tire throughout the lap, etc. Oh, and please explain how you will simulate cornering.
While you attempt to even provide a list of variables and equations involved in simulating the above, I can probably run a couple hundred real laps, or at least the the one at 12PM tomorrow if I could only get off work...
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Devil's advocate, here, again. You're straying from the purpose of dyno tuning at this point, which is to modify the output of the car.
Track temperature and how it affects a topmount car is slightly relevant, but tire temperature/pressure, fuel load, corner weights and simulating cornering have very little to do with power output, and I'm hard-pressed to think of a situation where knowing maximum lateral load is going to make a lick of difference regarding the horsepower output of the car. It seems like you're bringing in some of the other functions the Gtech can approximate, in order to track handling, and that's a valid point for that purpose. Noone's claiming a dyno is going to be valid for that kind of data.
If you're trying to say that a Gtech is more valuable *as an engine tuning tool* because of those reasons, I'd be skeptical, because many of the variables you specified will have a negligible effect on power output. Varied rolling resistance due to tire pressure and tire temp is not going to affect horsepower/torque output appreciably.
Is it a cheaper solution, yes. Is it a more portable solution, yes.
What this whole discussion grew out of was a concern that too much user tunability can be a dangerous thing. I'm not pointing this at you, Dean, just in general. We've had way too many horror stories (and cars in the shop with major problems) from totally user-tuneable solutions, becuase they're a double-edged sword. They're powerful, but it's really easy to make a mistake in tuning that can have unanticipated results. We're not trying to say that tuning one's car themselves is a poor decision, we're just trying to offer advice based on what we've seen. Do we like reflashes? Of course. Given our experience, we feel confident that it's a safe solution, above all else. What we like even more is happy customers without engine problems, no matter how or where they're tuned, or with what software, or by who, etc..
Anyways. Let's all try to breathe a little and back off. We're all here to have fun with our cars, not bicker about semantics, right? This whole discussion has spun way off the original tack, and we're going back and forth over moot points.