znod

G-morn, g-man. I posted some info on the other thread. In this regard, do you have 0-90, 0-100, or both for the runs below--which you posted earlier on this thread.

Well all I also have new runs to report.Some very interesting results.Both runs were made with DSC/DTC on and in D.
run 1(N) run 2(S)
0-10.............0.27.................0.27
0-20.............1.05.................0.92
0-30.............1.87.................1.62
0-40.............2.95.................2.75
0-50.............3.93.................3.78
0-60.............5.03.................5.00
0-70.............6.55.................6.58
0-80.............8.05.................8.15
1/8 time.......8.80.................8.70
1/8 speed.....83.0.................81.7
330'..............5.78................5.65
60'...............2.05.................1.95
HP...............372@55mph......356@57mph.

grogan545

Answered on the other thread.

DD694

Impressive numbers. Do you think "learning" is the reason for the improvement?

grogan545

Not in my case my car has "learned" all it can at this point.Some of my excellent times are due to cold weather,and some of it is due to my new method(all controls on,in D).I also have over 19000 miles on my car,so it is well broken in.

znod

Got it. OK, I can get by with your best estimate of what your average 0-90 would have been on that series of runs.

znod

Hi g-man:

I made a mistake in my earlier calculations suggesting that actual speeds could be used as very close approximations of trap speeds for 1/4's and 1/8's. Here is how I should have calculated (i.e., in my earlier calculations, I forgot to multiply by 60 in the third calculation).

5280 = ft. car goes in 1 min. at 60 MPH
5280(104.5 / 60) = 9196 = ft. car goes in 1 min. at 104.5 MPH
60(66 / 9196) = .43062180 = sec. car takes to go 66 ft. at 104.5 MPH

Below are my Pro RR values for my best 1/4 of 13.63 and some related values preceeding these--back 66 ft.

13.2 1254.74 102.73
13.63 1320.12 104.5

Thus, the average speed for the trap is 103.62--which is what the Pro SS gives for my 1/4 speed on this run. And, note that 13.63 - 13.2 - .43. On my best run, I listed my trap speed erroneously as 104.5, and I made the same error on others. I am going to correct them now.

jim_in_calgary

This is an interesting thread.

I have seen 1/4 mile times corrected for altitude. Is there any way to readout a corrected time/HP figure on these devices?

My location is 4000 ft above sea level, and I notice my cars have more pep when I travel to a sea level location.

I'd be interested in seeing the different readouts for the same car at sea-level and 4000 ft above if you could manage to get air temperatures in the same range.

znod

Hi jim:

Let's see what grogan545 says about such conversions. He is a serious drag racer from way back. Earlier, he gave me a link to SMOKEuP.com. Check out the altitude correction table here. You could apply it to our cars' data--given our altitudes (see below for mine)--to see how the cars would stack up at 4k ft. If you do so, then please post your results here. They should be interesting. Thank you for your interest in this thread.

The correction factors are big for 4k feet. They even matter in my location. I think I'll apply them to my data. I am not sure what grogan545's elevation is. My runs are done at about 1500 ft. as I recall. Also, temperature conversions are available at the same site. My recent runs have been at about 50F.

znod

Hokay, I adusted my latest data for the 1500' correction factors of .9835 (time) and 1.0171 (speed). You can go from there using the 4000' factors. And, g-man, what do you think? Naturally, I like it. But, it means perhaps unrealistically, for example, that I had some sub 5 sec. 0 to 60's prior to 20.01.00 since .9835 X 5.07 = 4.986. What would your correction factors be?

Mods Off..........S/DS..........S/DS.........N/DS
Pro RR............Test 13......Test 14.....Test 15.....Average
1/4 Time..........13.404.......13.517......13.476..... .13.466
1/4 Speed......104.466.....105.392.....104.670....104. 843
1/8 Time...........8.707.........8.789........8.767... .....8.754
1/8 Speed........82.450......81.870.......82.150...... 82.157
0-100..............12.346.......12.605......12.476.. ....12.475
0-90................10.078.......10.283......10.189. .....10.183
0-80..................8.298.........8.482........8.4 04.......8.395
0-70..................6.685.........6.832........6.7 81.......6.766
0-60..................5.064.........5.183........5.1 45.......5.131
0-50..................3.882.........3.969........3.9 56.......3.936
0-40..................2.837.........2.918........2.9 08.......2.888
0-30..................1.714.........1.749........1.7 53.......1.739
0-20..................0.973.........1.003........1.0 03.......0.993
0-10..................0.313.........0.333........0.3 30.......0.326

1/4 Time...........13.404......13.517......13.476..... .13.466
1,000 Ft............11.258.......11.356.....11.325...... 11.313
1/8 Time............8.707.........8.789.......8.767... .....8.754
330 Ft................5.684.........5.744.......5.732. .......5.720
60 Ft..................2.000.........2.030.......2.02 7........2.019

grogan545

Hi Znod,I owe you some answers from previous posts.

My best estimate for 0-90 &0-100 on my last 2 runs posted on 2-06-06 are:
................run 1.............run 2
0-90.........9.50..............9.65
0-100......11.55.............11.92

I can't believe we never discussed the altitude question before.Your altitude of 1500' certainly makes a difference in your times.The altitude here is about 300' so the difference is significant.I don't know if the factors gathered from the NHRA chart are true for the "time to Speed" figures,but the definitly are adversley affected by altitude.

I applied an extrapolated factor for 300' altitude to my best 0-60 run and I get .99664 X5.00=4.983.
Almost exactly what your best 0-60 after correction of 4.986.Very interesting.

Maybe your car was faster than mine before you went to 20.01.