ladeback
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Post by ladeback on May 25, 2011 22:47:51 GMT -7
My son recently won first place in his district and then competed against 5 other districts to take the overall state title. His fastest time was 2.9040. They use an aluminum Besttrack system with a Fast track timer at districts. There are 4 straight sections after the curve section and a stop section after the 4th straight section. Is this the same length as the track used at PDDR. I tried counting the number of straight sections in the PDDR race videos and it looks like 4 after the curve. I looked at the fastest times for the most recent pure stock race and the fastest time was 2.9840. Our time doesn't seem possible. Here is a link to a video of the races-
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ladeback
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Post by ladeback on May 25, 2011 23:38:54 GMT -7
The finish gate was positioned at the very end of the track where the track meets the stop section. It looks like the holes weren't predrilled when they ordered it.
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Post by Zeebzob on May 26, 2011 5:07:39 GMT -7
The biggest difference is the angle of the hill. PDDR is set to 27.1 degrees. A steeper hill by 1 degree for example will result is drastically faster times.
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Post by *5 J's* on May 26, 2011 11:50:57 GMT -7
The biggest difference is the angle of the hill. PDDR is set to 27.1 degrees. A steeper hill by 1 degree for example will result is drastically faster times. Interesting and you are correct that a steeper hill will produce faster times Isn't the "design" slope 30.0 degrees on a Besttrack? |
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ladeback
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Post by ladeback on May 26, 2011 15:28:55 GMT -7
The biggest difference is the angle of the hill. PDDR is set to 27.1 degrees. A steeper hill by 1 degree for example will result is drastically faster times. That makes sense. I never thought about that. |
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Post by Zeebzob on May 26, 2011 16:22:15 GMT -7
The biggest difference is the angle of the hill. PDDR is set to 27.1 degrees. A steeper hill by 1 degree for example will result is drastically faster times. Interesting and you are correct that a steeper hill will produce faster times Isn't the "design" slope 30.0 degrees on a Besttrack? I'm not sure what is designed, but I wanted to set my track the same as the league for an apples to apples comparison. |
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Post by downslope on May 27, 2011 3:58:37 GMT -7
CCRL track is 27.1 also.
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ladeback
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Post by ladeback on May 30, 2011 23:16:12 GMT -7
If PDDR and CCRL have the same 27.1 degree slope, why do their pure stock times differ so much?
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Post by resophonic1 on May 31, 2011 5:16:39 GMT -7
If PDDR and CCRL have the same 27.1 degree slope, why do their pure stock times differ so much? PDDR has a laser starting gate and the new timer chip from microwizard, that will make a difference as well. I've seen times vary as much as .080 seconds without the same brand timer. |
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Post by resophonic1 on May 31, 2011 8:39:59 GMT -7
I'm no expert on tracks, but other variables come into play just as much as the laser gate, maybe not as much as the angle or which hole the finish line tower is set into, but....if the track is close to the floor or if it is up 2 or 3 feet from the floor makes a big difference in the times. The closer to the ground the track is, makes cars a tick quicker because the air is cooler and less dense down there. Also, a track such as the pddr track that has had thousands of passes on it will be faster than one that is new and is set up identically that has had less runs on it. Meaning the newer track will be "green" and not as smooth as the pddr track. Another factor is the temperature in the room. If you keep the "track room" temp. at lets say 70F degrees, in the summertime the room will be using cool air to keep that temp.,but in the winter time by using heat to keep that temp. the room will have more humidity in it making the air "thicker" thus slowing the cars a bit even though the temperature is the same. That's why playing the proxy game is soooo tricky. When using oils, during the warmer months will not give you the same results during the colder months due to evaporation. That is why I was able to use the same wheel/axles without reprep on 5 different cars between Nov. 2010 thru March of 2011 without falloff and about 200 passes down 3 different tracks(using John's process w/blue can spray on the axles and his oil). Just my 2 cents, but I really wish I knew more about building a car than I do air temps. Take care yall!! well said! |
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Axiom Paradox
PURE STOCK
I reject your reality and substitute my own. [Mo0:0]
Posts: 12 
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Post by Axiom Paradox on May 31, 2011 9:26:56 GMT -7
I'm no expert on tracks, but other variables come into play just as much as the laser gate, maybe not as much as the angle or which hole the finish line tower is set into, but....if the track is close to the floor or if it is up 2 or 3 feet from the floor makes a big difference in the times. The closer to the ground the track is, makes cars a tick quicker because the air is cooler and less dense down there. Also, a track such as the pddr track that has had thousands of passes on it will be faster than one that is new and is set up identically that has had less runs on it. Meaning the newer track will be "green" and not as smooth as the pddr track. Another factor is the temperature in the room. If you keep the "track room" temp. at lets say 70F degrees, in the summertime the room will be using cool air to keep that temp.,but in the winter time by using heat to keep that temp. the room will have more humidity in it making the air "thicker" thus slowing the cars a bit even though the temperature is the same. That's why playing the proxy game is soooo tricky. When using oils, during the warmer months will not give you the same results during the colder months due to evaporation. That is why I was able to use the same wheel/axles without reprep on 5 different cars between Nov. 2010 thru March of 2011 without falloff and about 200 passes down 3 different tracks(using John's process w/blue can spray on the axles and his oil). Just my 2 cents, but I really wish I knew more about building a car than I do air temps. Take care yall!! Don't forget to include the dynamics of the Coriolis Effect......  |
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Post by 2FAST4U on May 31, 2011 23:18:01 GMT -7
the biggest differents in the 2 tracks would be hill angle and the new timer chip that we changed out this year... microwizerd had and update on there timer. with the new chip the timer is faster and more true to real times. giving the cars slower times... hope this helps... also i watched the video, great job by the way... they did not have an ESS on the track as well by pulling the lever by hand that could very the times form race to race... not that much, but it can make your car look like it was not consistent...
glenn
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