The Official G-Meter Testing Thread
#221
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Originally Posted by grogan545' post='245464' date='Feb 24 2006, 01:12 PM
I used this method on all of my runs that I could and tried it on some of your runs also.It is not perfect but more times than not it is less than .05 sec diff.I am sure there is a math solution to this but to date I have not discovered it.
Unadjusted 1/4 Times: 13.629 13.744 13.702 13.742 13.720 13.764 13.686 13.742 13.759 13.774 13.772
Unadjusted 0-60 Times: 5.149 5.270 5.231 5.273 5.206 5.301 5.209 5.237 5.286 5.299 5.282
Regression Coefficients: a = -8.808; b = 1.024
Applying the coefficients to the unadjusted 1/4 times yeilds the following values and differences:
Actual 0 to 60:................5.149...5.270...5.231...5.273.. .5.206...5.301...5.209...5.237...5.286...5.299...5 .282
Less calculated 0 to 60:..5.146...5.263...5.220...5.261...5.239...5.284 ...5.204...5.261...5.279...5.294...5.292
Difference:......................0.003...0.007...0 .011...0.012..-0.033...0.017...0.005..-0.024...0.007...0.005..-0.010
I could easily live with predictions of adjusted zero to 60's being off only by such amounts.
Here are my related weather/altitude adjusted 1/4 times:
Adjusted 1/4 Times: 13.451 13.565 13.523 13.562 13.593 13.637 13.559 13.61 13.627 13.642 13.550
Applying the regression coeffients gives:
Predicted Adjusted 0 to 60: 4.963 5.080 5.037 5.077 5.109 5.154 5.074 5.126 5.144 5.159 5.065
I like the way the above values look. Maybe I had a sub 5 second zero to 60 too. I am going to see what happens using OLS regression on other values.
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Originally Posted by Znod' post='245578' date='Feb 24 2006, 05:52 PM
I had a tad of time today so I tried ordinary least squares (OLS) regression for zero to 60's. My results look promising.
Unadjusted 1/4 Times: 13.629 13.744 13.702 13.742 13.720 13.764 13.686 13.742 13.759 13.774 13.772
Unadjusted 0-60 Times: 5.149 5.270 5.231 5.273 5.206 5.301 5.209 5.237 5.286 5.299 5.282
Regression Coefficients: a = -8.808; b = 1.024
Applying the coefficients to the unadjusted 1/4 times yeilds the following values and differences:
Actual 0 to 60:................5.149...5.270...5.231...5.273.. .5.206...5.301...5.209...5.237...5.286...5.299...5 .282
Less calculated 0 to 60:..5.146...5.263...5.220...5.261...5.239...5.284 ...5.204...5.261...5.279...5.294...5.292
Difference:......................0.003...0.007...0 .011...0.012..-0.033...0.017...0.005..-0.024...0.007...0.005..-0.010
I could easily live with predictions of adjusted zero to 60's being off only by such amounts.
Here are my related weather/altitude adjusted 1/4 times:
Adjusted 1/4 Times: 13.451 13.565 13.523 13.562 13.593 13.637 13.559 13.61 13.627 13.642 13.550
Applying the regression coeffients gives:
Predicted Adjusted 0 to 60: 4.963 5.080 5.037 5.077 5.109 5.154 5.074 5.126 5.144 5.159 5.065
I like the way the above values look. Maybe I had a sub 5 second zero to 60 too. I am going to see what happens using OLS regression on other values.
Unadjusted 1/4 Times: 13.629 13.744 13.702 13.742 13.720 13.764 13.686 13.742 13.759 13.774 13.772
Unadjusted 0-60 Times: 5.149 5.270 5.231 5.273 5.206 5.301 5.209 5.237 5.286 5.299 5.282
Regression Coefficients: a = -8.808; b = 1.024
Applying the coefficients to the unadjusted 1/4 times yeilds the following values and differences:
Actual 0 to 60:................5.149...5.270...5.231...5.273.. .5.206...5.301...5.209...5.237...5.286...5.299...5 .282
Less calculated 0 to 60:..5.146...5.263...5.220...5.261...5.239...5.284 ...5.204...5.261...5.279...5.294...5.292
Difference:......................0.003...0.007...0 .011...0.012..-0.033...0.017...0.005..-0.024...0.007...0.005..-0.010
I could easily live with predictions of adjusted zero to 60's being off only by such amounts.
Here are my related weather/altitude adjusted 1/4 times:
Adjusted 1/4 Times: 13.451 13.565 13.523 13.562 13.593 13.637 13.559 13.61 13.627 13.642 13.550
Applying the regression coeffients gives:
Predicted Adjusted 0 to 60: 4.963 5.080 5.037 5.077 5.109 5.154 5.074 5.126 5.144 5.159 5.065
I like the way the above values look. Maybe I had a sub 5 second zero to 60 too. I am going to see what happens using OLS regression on other values.
et=13.45 actual,0-60=5.00(grogans formula for 1/4 time)
et=13.45 corrected,0-60=4.961 corrected (Z's best run).
It would be interesting to see how the magazines get their time to speed data since MT & CD do use weather corrections for their acceleration data.There must be a formula based in fact to do this conversion.
#223
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Originally Posted by grogan545' post='245831' date='Feb 25 2006, 08:06 AM
Very interesting Zman.Without going into great depth it looks like this method is reasonable in predicting corrected 0-60 times.I have to review some of my previous conversions but I believe they will show that similar 1/4 et's will give similar 0-60 times.The actual times seem to mirror the corrected times.Example:
et=13.45 actual,0-60=5.00(grogans formula for 1/4 time)
et=13.45 corrected,0-60=4.961 corrected (Z's best run).
It would be interesting to see how the magazines get their time to speed data since MT & CD do use weather corrections for their acceleration data.There must be a formula based in fact to do this conversion.
et=13.45 actual,0-60=5.00(grogans formula for 1/4 time)
et=13.45 corrected,0-60=4.961 corrected (Z's best run).
It would be interesting to see how the magazines get their time to speed data since MT & CD do use weather corrections for their acceleration data.There must be a formula based in fact to do this conversion.
I had 3 very, very good runs this morning and will be reporting on them soon. New best--at least under 20.01.00. Persistence and patience with car learning.
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Originally Posted by Znod' post='245833' date='Feb 25 2006, 08:32 AM
Right, I thought about that too. What else to do you know about MT's procedures. I am accumulating data on the mags procedures.
I had 3 very, very good runs this morning and will be reporting on them soon. New best--at least under 20.01.00. Persistence and patience with car learning.
I had 3 very, very good runs this morning and will be reporting on them soon. New best--at least under 20.01.00. Persistence and patience with car learning.
I am waiting for your new results.I still find it amazing that your car continues to learn over a long period of time.I will not have more testing until after next week.I am hoping that in May the weather conditions will be close to the "standard" conditions so that very little correction is necessary.Last year when I began testing in May I got very good results and I know the temp was between 55 & 65 F.I know the corrections are necassary for comparison but I still need to be convinced that at the extremes(very poor,very good)the results are accurate.
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Originally Posted by grogan545' post='245844' date='Feb 25 2006, 09:08 AM
I am waiting for your new results.
I wanted to go out badly this morning because I had some good runs yesterday, but I had too much wheel spin. Nevertheless, I though my car was running good and decided that I had over brake torqued. Today I used very minimal brake torquing and had three essentially zero wheel spin runs in a row.
Below are the three new sets of data from today, along with two older sets. Together, these five runs yield my top five sets of adjusted data (with one exception from yesterday--a run with noticeably worse unadjusted data, but slightly better adjusted data than one of those below). I used the regression apporach in getting my adjusted zero to 60's. I am starting to believe that my car has mostly overcome 20.01.00. Soon, I am going to do a comparison of the type I usually do using my unadjusted and adjusted data from today's best run--to see if all of the relationships, given the use of regression, look reasonable.
Unadjusted:
.......................2/18..........2/20.......2/25..........2/25.......2/25
1/4 Speed.....102.710...103.240..104.050...103.640.103.710
1/4 Time.........13.629.....13.686..13.564.....13.663.....13.631
1/8 Speed.......82.450.....82.170....82.880.....82.530 ...82.490
1/8 Time..........8.853........8.894.....8.810.......8 .859.....8.858
0 to 60.............5.149.......5.206....5.079.......5.145......5.161
Adjusted:
.........................2/18........2/20........2/25........2/25........2/25
1/4 Speed.....104.083...104.218.104.862.104.449....104.519
1/4 Time.........13.451.....13.559...13.461....13.559......13.527
1/8 Speed.......82.584.....82.644......82.928.....82.7 46....82.776
1/8 Time..........8.725.......8.802........8.732...... ..8.802.....8.779
0 to 60............4.959.......5.071......4.970.......5.071.......5.038
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Originally Posted by Bokke' post='245885' date='Feb 25 2006, 12:38 PM
Rain today Leaving on a business trip tomorrow, so no testing until next weekend!
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Originally Posted by Znod' post='245578' date='Feb 24 2006, 02:52 PM
Applying the coefficients to the unadjusted 1/4 times yeilds the following values and differences:
Actual 0 to 60:................5.149...5.270...5.231...5.273.. .5.206...5.301...5.209...5.237...5.286...5.299...5 .282
Less calculated 0 to 60:..5.146...5.263...5.220...5.261...5.239...5.284 ...5.204...5.261...5.279...5.294...5.292
Difference:......................0.003...0.007...0 .011...0.012..-0.033...0.017...0.005..-0.024...0.007...0.005..-0.010
Actual 0 to 60:................5.149...5.270...5.231...5.273.. .5.206...5.301...5.209...5.237...5.286...5.299...5 .282
Less calculated 0 to 60:..5.146...5.263...5.220...5.261...5.239...5.284 ...5.204...5.261...5.279...5.294...5.292
Difference:......................0.003...0.007...0 .011...0.012..-0.033...0.017...0.005..-0.024...0.007...0.005..-0.010
NICE so your car learned to be fast again. I havent been following since you guys posted waaay too much
can someone give me a re-cap really fast.
Znod: Have you just been beating the heck out of your car to make it re-learn?
What did you, or did you "un-mod" something to make your car fast again?
#229
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Originally Posted by EBMCS03' post='246176' date='Feb 26 2006, 03:05 AM
NICE so your car learned to be fast again. I havent been following since you guys posted waaay too much
can someone give me a re-cap really fast.
Znod: Have you just been beating the heck out of your car to make it re-learn?
What did you, or did you "un-mod" something to make your car fast again?
can someone give me a re-cap really fast.
Znod: Have you just been beating the heck out of your car to make it re-learn?
What did you, or did you "un-mod" something to make your car fast again?
grogan545's car immediately took a liking to 20.01.00. And, its performance seems better after than before.
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Originally Posted by grogan545' post='244265' date='Feb 22 2006, 12:28 PM
I did find the "Standard conditions" they are 59 F,29.92 barometer,and 0% humidity.