32 foot track?

[Classy Chassis]

I am tuning on a 32 foot track and am not sure how to judge the times. I would think take the time of a 42 foot track and devide it by 42 to get my per foot time and then that is the time per foot I should look for xs 32. Is that right? If not a math formula would be greatly appreciated. My Artsy mind doesn't work in the technical realm very well /images/boards/smilies/smile.gif

 

[speed bump]

Don't know how to do that.But our council race was 2.446 was the fasted time i seen.Our car got 3rd and it was 2.454.If that helps or not!

 

[Chief]

[font="times new roman, times, serif"]In my Xperience it will only work on paper...although I have figured my own way of doing Xactly what you are trying to do. Typically for me if I add a tenth of a second per foot I can get super close. So if you run a 2.5XX on a 32 foot track, then just add a tenth for every foot there after. Remember you need to know the distance from starting pin to finish line not total distance of track. I think a 32 foot track is like actually 27 or 29 feet and a 42 foot is 36 feet and some change...on our track at home with the same car, we ran a 2.373 and at Cabin Fever we ran 3.058. Hope this helped[/font]

 

[DNA RACING]

it is a often asked question, and a very hard one to answer. first off the cars will slow down more per foot -every foot. thats what makes it hard to figure. the first 10 feet after the hill are alot faster than the next 10 feet, and the last 10 feet are slower still. it is hard to put a number when for every foot you are running a few.001 or .0001 slower than the foot before. i used to figure about a half a second for every 7' track section, but that is a average and not a set in stone number.

 

[Old Geeezer]

I just set up my Best Track 42' yesterday for some testing then set it at 35' for some District testing. With same car and setup at 42' the time was 3.016 with graphite then only change removing one section making 35' the time was 2.501 with 27.1 slope. Hope this helps......

 

[mgh Racing]

I run a 32' best track (yep, I cut 3' off of a 35' to fit it in the basement)...no idea what the hill angle is, but I run 2.29X's for my league cars and 2.30X-2.32X for scout cars.

 

[OPARENNEN]

I am tuning on a 32 foot track and am not sure how to judge the times. I would think take the time of a 42 foot track and devide it by 42 to get my per foot time and then that is the time per foot I should look for xs 32. Is that right? If not a math formula would be greatly appreciated. My Artsy mind doesn't work in the technical realm very well /images/boards/smilies/smile.gif

The formula changes from track to track. But what I do is use John's track as the basis. Immediately B4 sending him the cars to a race, I make 6 runs with each car and take an average time. Then after the race, and the cars are returned, I immediately do the same again. Then I take the average time from the Utah race for each car, and divide to get the ratio.
I.e. DD4Htime/Hometimeaverage. In my case, the ratio is about 1.2178.

So for new cars, I get an average time on my track, times 1.2178, and I have a close best guess of what the time will be at Utah.

Incidentally, the ratio changes from class to class, but not by much.

 

[John Thawley]

I'm surprised no one is factoring for the difference in timers.

I recently purchased a three lane 42' BestTrack and MicroWizard timer. I drove myself nuts trying to beat the times for our 2011 Council car that ran a 3.043 on a 42' BestTrack with a MicroWizard timer. Then I recalled there has been an update in the chipset for the MicroWizard. I placed a call to them and was told the difference is .05 faster... ie; your car will be .05 slower using the new timer.

I also noticed a HUGE variable in launch times when using the hand lever on the BestTrack gate. The MicroWizard timer switch engages immediately upon release... the drop pins... not so much. If you run three cars over and over, you'll see what I mean. When the time difference between runs is constant between all three cars, it's easy to see the variable in gate release times. I've resolved this by installing the Jewkes ESS system. Now starts are constant.

My last "issue" of consistency is the surface my track sits on. I've got the incline at 27.1 degrees... but the hill, curve and first few feet of the first straight sit on a marble floor and transitions to carpet. I think I have a touch of an incline at that point and at the end.

I'm setting the track up in a hall on Saturday for our Pack race. I'm hoping to get some of my questions answered there.

JT

 

[John Thawley]

I.e. DD4Htime/Hometimeaverage. In my case, the ratio is about 1.2178.

So for new cars, I get an average time on my track, times 1.2178, and I have a close best guess of what the time will be at Utah.

Incidentally, the ratio changes from class to class, but not by much.

Are your times better on John's track or your track?

JT

 

[Classy Chassis]

well guys thanks for the input but today I went to tune on the test track at the hobby store. After spending about 45 minutes properly cleaning their track, got my tuning board set up and ready to roll, the timer on their track was malfunctioning so both my cars ran 0.005. Beat that time Boyz! haha. Oh well the store was full of dust and flying moss particles from a nearby little train track they had set up. So I came home, striped the cars and will clean and repolish tonight.

 

[OPARENNEN]

I.e. DD4Htime/Hometimeaverage. In my case, the ratio is about 1.2178.

So for new cars, I get an average time on my track, times 1.2178, and I have a close best guess of what the time will be at Utah.

Incidentally, the ratio changes from class to class, but not by much.

Are your times better on John's track or your track?

JT

My times are on a 32 foot track, which makes the time faster. Also, my transisition bend is more gradual. But that all works out fairly close using my formula.
So, 1.2178 times "mytime" gives me an expected DD4H time, which would be more time, because his is 42 feet.