[jdrxb9]

Originally Posted by Jawnathin

Ok, that sounds really complicated. I'm not sure how you could accurately measure the effects of some of these factors << snip >>

Well, good thing I'm not trying to accurately account for those factors, or others - non-level pavement probably being the biggest. Seriously, as I mentioned in the first post, it is an approximation to be used for comparison purposes. The objective is to answer the question: if all else is the same, what is the effect of gearing on time to distance for representative starting speeds and distances? I don't think the rolling resistance or aero differences between the tires considered will be significant and I think a torque curve approximated at 500 rpm intervals with linear interpolation between is also ok since it is the same for each case. It really isn't that complicated for straight line acceleration with no tire slip - see here for a more detailed discussion of the principals and equations.

That said, I did compare the results to my data and also C&D's 5 mph - 60 mph data (which, btw, shows 0.5 sec variance for the same car) and added a correction factor to get it to generally match. I say generally, because the factor required to match 7.5s 5-60 is different than matching 8.0s 5-60 is different than all the different factors required to match all my different 'pulls'. In the end, I just had to pick one factor and let it be.

Originally Posted by Jawnathin

Well I was thinking of the drag strip start being a little different from your typical NT event.

Since the general technique is to spin (gearing irrelevant) through a good part of 1st gear, I'm only considering from 4500rpm to redline in 1st at the 'start'. How that compares to a non-pro course will be wildly variable - could be a lot different if the course forces a 'short shift' near the line or could be similar if the course allows carrying 1st across the line and reaching redline before grabbing 2nd.

Originally Posted by Jawnathin

What do you think about looking at 90%+ or something for commanded throttle for acceleration runs? I think the ECU does something funny with its commanded throttle calculation. I took a quick look at one of the logs and in different parts of the run I was able to have several duplicate 98.5294117647058 and 97.0588235294117 commanded throttle position entries.

Other than to verify you've done solostorm's throttle calibration, not sure what to tell you here. My csv outputs show consistent 100%'s aside from the odd leading or trailing values. If you have csv outputs from SCCA courses at Crows Landing, I'll take a look - see my PM for an email address. Keep in mind, I'm just going to look at them get representative corner exit speeds and 'straight' lengths which can then be used to generate comparisons.