faster times at same track?

[briand]

I was looking at the winning times for the march madness races and also looking at the times for the previous race in January at the same track, why are the times so much faster in the march madness race?

 

[Owens Racing]

IIRC, there was a change made to the start gate spring.

 

[Resophonic Racing]

IIRC, there was a change made to the start gate spring.

Correct a faster smoother start resulted in the time changes.

 

[briand]

Thanks

 

[Quicktimederby]

This is also a perfect case in point as to way it is impossible to say how fast a given car would be on different tracks. A slight change in the start gate caused huge time changes. Every track is different therefore there is no way of knowing how fast your car will be till it is sent in.

I was looking at the winning times for the march madness races and also looking at the times for the previous race in January at the same track, why are the times so much faster in the march madness race?

 

[txchemist]

The new fast times present interesting changes one must make to model the track now.
The unlimited class is so fast, you have to make a few changes or you are faced with a car going faster than it could go on a level track with a start angle of 27.1 degrees. You either force fit a shorter track, or force a steeper slope until you get the unlimited going the correct time. Then you can check and see what the SS time is and discover good correlation. Even if the track is 27.1, it would have to be allowing a small drop on the flat to get such low times. In that case one would assume a flat track and force the higher angle anyway..

Use a coefficient of friction of 0.0035 for the unlimited and then calculate the starting angle to give the fastest time on the track. Those two fast runs probably were perfect. After you come up with a new angle, PM me to compare. Hint, it is not over 28.5 degrees.

 

[zeebzob]

So what is the spring mod? I have always been disappointed with the way the gate slams open.

 

[zeebzob]

So what is the spring mod? I have always been disappointed with the way the gate slams open.

 

 

 

 

Anyone? Anyone?
Halliburton? Halliburton? Halliburton? Halliburton?

 

[Downslope]

Not sure but I think that the spring broke and they just put a different one on probably a little heaver.

 

[Quicktimederby]

For mine the way I calmed down the opening force was by to reduce the length of the pins. I believe I cut about 1/2 inch off. Applied a little more foam to the bottom and softened the spring tension. Worked like a charm!

So what is the spring mod? I have always been disappointed with the way the gate slams open.

 

[DerbyDad4Hire]

For mine the way I calmed down the opening force was by to reduce the length of the pins. I believe I cut about 1/2 inch off. Applied a little more foam to the bottom and softened the spring tension. Worked like a charm!

So what is the spring mod? I have always been disappointed with the way the gate slams open.

 

 

 

 

This is the trick! Play with the foam until the gate is soft. Let me try and get some pics.

 

[zeebzob]

For mine the way I calmed down the opening force was by to reduce the length of the pins. I believe I cut about 1/2 inch off. Applied a little more foam to the bottom and softened the spring tension. Worked like a charm!

So what is the spring mod? I have always been disappointed with the way the gate slams open.

Yeah, I already removed the 3 1/2 inch screws and replaced them with 2 inch screws, but that didn't change the times like it did for March Madness.

It has helped greatly with consistency. What was happening with the longer pins is that they would occasionally bounce back up and hit the bottom of the car as it started to roll, making the car suddenly jerk to the left or right. With the short pins, it never comes close to bouncing that high.

With the cars that we run, there is no need for anything longer