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Discussion Starter #1
Ok i set new P/B the last 2 times out and the only difference in the DA was 281 ft. The only change i made was a new battery. Now could it of been the old battery was week and the coil packs wernt getting what they need to give a full charge to the plugs or was it the lower DA from +293 to +12 ft. Heres the 2 runs with DA. Chime in and tell me what you think the gain was in the 2 times. The gas was 93 octane.

12/16/2010
RUN 3 / Temp 54.4 / Humid 80% / Pressure29.94 / 40 Month Old Oem Battery / 93 Octane
DA......+293 FT Note
60'......1.765
330'....5.194
1/8.....8.084
MPH....84.73

2/3/2011
RUN 1 / Temp 57.9 / Humid 49% / Pressure 30.35 / + New Battery / 93 Octane
DA.....+12 FT Note
60'.......1.732 P/B Even here i felt the tires slip a little and same on run 2.
330'.....5.100 P/B
1/8......7.956 P/B
MPH.....85.70

Its hard for me to see that a lower DA of 281 ft would make a diff of .128 & 1 mph in the 1/8 mile and .20 & 1.7 mph in the 1/4 mile.
 

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I do a ton of racing and I don't think you would see that kind of gain. there are so many factors, but my duster usually averages out to about .1 per 1000ft drop/increase. I think it was mostly gained in the 60'. Did you stage the same? not trying to insult your racing abilities, but I can play with numbers bigtime at the track if i decided to stage differently. That first 60' is everything. I had a chart somewhere and can't find it now, but on a given day my car will pick up about .1 for each .03 in the 60. That is about what you picked up. Could have been other factors as well and most certainly a combination of all factors.

just my .02
 

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Discussion Starter #3 (Edited)
I do a ton of racing and I don't think you would see that kind of gain. there are so many factors, but my duster usually averages out to about .1 per 1000ft drop/increase. I think it was mostly gained in the 60'. Did you stage the same? not trying to insult your racing abilities, but I can play with numbers bigtime at the track if i decided to stage differently. That first 60' is everything. I had a chart somewhere and can't find it now, but on a given day my car will pick up about .1 for each .03 in the 60. That is about what you picked up. Could have been other factors as well and most certainly a combination of all factors.

just my .02
When i raced my 73 duster they had no 60' or 1/8 mile clocks and when i started racing in 59 there was no tree lol.
Well you see the 60' are only .03 apart and i always leave at idel and run in the same lane. You can see the runs were about 2 months apart and the TEMPS WERE ABOUT THE SAME. The only thing i can fig out the battery was getting week as it went out about a week after my dec run. I always run the same tire pressure of 40 front and 36 rear on OEM GY RUNFLATS. Now i have ran the same et at 2300 ft as i did at 1000 ft as the DA never really changed my times that much.
 

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Yep, I have seen with all my cars that a 1000ft change in DA is a .1 either way. Depends on plus or minus DA.
 

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I do a ton of racing and I don't think you would see that kind of gain. there are so many factors, but my duster usually averages out to about .1 per 1000ft drop/increase. I think it was mostly gained in the 60'. Did you stage the same? not trying to insult your racing abilities, but I can play with numbers bigtime at the track if i decided to stage differently. That first 60' is everything. I had a chart somewhere and can't find it now, but on a given day my car will pick up about .1 for each .03 in the 60. That is about what you picked up. Could have been other factors as well and most certainly a combination of all factors.

just my .02
I agree with you completely. The examples you gave were spot on for my race car. The only thing I will add is with my Challenger I seemed to get about .15sec/1000' DA. I think the difference is a stock small motor versus a built big block.
My best times in the 12.4's in my RT were around 500' but it would run 12.5~12.6 at 1800~2000', and 12.7's at 3000'. Being a bracket racer I kept a log book on my car and could pretty much dial it off a given DA.
 

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Discussion Starter #6 (Edited)
I agree with you completely. The examples you gave were spot on for my race car. The only thing I will add is with my Challenger I seemed to get about .15sec/1000' DA. I think the difference is a stock small motor versus a built big block.
My best times in the 12.4's in my RT were around 500' but it would run 12.5~12.6 at 1800~2000', and 12.7's at 3000'. Being a bracket racer I kept a log book on my car and could pretty much dial it off a given DA.
Here is a few passes i made with diff DA.
Date........Gas......DA......ET.......MPH
6/3/10.....91.....+1487....8.14.....84.09
9/9/10.....93.....+1587....8.10.....84.42 - I think the battery was going bad here.
12/16/10..93.....+557.....8.08.....84.76 - Here is -1039 ft from 9/9/10 & a gain of .02 & .34 mph.
New Battery
2/3/11.....93.....+12.......7.95.....85.91 - Here is -281 ft from 12/16/10 & a gain of .13 & 1.15 mph

The biggest trouble we have in CA is the humidity at night.
HUMIDITY
6/3/10.........63%
9/9/10.........57%
12/16/10......69%
2/3/11.........49%
 
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