Well that was an interesting test night out.
The good: I did get some data.
Made a few runs and the app showed satellite signal lost so I shut down each time I saw that.
After we loaded the machines onto the trailer I decided to check the phone app anyway. UnFKN believable. Even though signal was lost it was still recording and each run was auto saved. So I have to log this as operator error because I didn't have enough experience with the app. I will know better next time.
I only managed to get one good run on my machine because of the above, so there is data for my machine on pavement. Quite a difference from gravel data.
Also note that the app no longer recorded the time for 50 mph and 60 mph.
The Bad: I managed to blow my driven clutch - Pics below.
Like I said before, I don't think there is a FN thing we haven't busted on our machines.
CO

Based on that chart 50 mph was reached in 8.5 seconds and 60 mph was reached in 16 seconds approx.
It's raining here now and have a few things to do tomorrow. Next friday/saturday I have to dig a water line.
When time permits we will take out the death machine and my brothers machine again for speed runs.
This is a project in progress. Be patient.
CO

Well I got a speed run on my brothers machine. WOW.
Way more top speed and I think it still had some legs in it. Maybe a mph or even two.
From the chart you can see his bottom end a bit slower but that could be because I got wheel spin on the pavement and my machine has the red spring in the driven. It caught up to my chart at the 40mph mark, so it was gaining on my machine fast. Top speed clocked in at 64mph. I didn't think these machines had that.
Also of note is the 0 to 60 time. My machine approx 15sec. My brothers 10.5 sec approx.
CO

Edit: Death machine with homemade head when time permits.
CO

One other thing I just noticed on those charts.
My machine was a rocket to 30mph and then the curve flattened and it was a long run to 60mph.
My brothers machine was a rocket to 50mph and then the curve flattened.
Looks like that's difference between the basically stock Engine and a ported/shaved cylinder Engine.
CO

Accuracy of these apps.
From what I have found online these phone apps are not 100% accurate.
Apparently there is a delay between the satellites, cell phone tower and your phone.
In the you tube video below, a guy takes his camaro to the drag strip and checks the phone app to the actual drag strip ticket. Not sure what app he was using. If you start the vid at 1:30 and then pause it when ever the info shows up you can write down the numbers from the phone and then start/pause the video when it shows the ticket. You will notice there is about a 1 sec difference.
I am having a lot of difficulty getting a gps lock but it does happen eventually after a few runs. The reviews on the app state that gps locking issue really clearly. Again the app I'm using is called DragRacer. In my opinion it's a piece of s### app but I am able to get data if I'm patient. All of my runs will have the same connection and variance issues but at least they will be all the same.
https://www.youtube.com/watch?v=JOKzSWtsHuY
CO

Plan on taking out the death machine for a test run in about 3hrs.
This machine has:
1) A welded piston
2) Homemade head
3) 102c clutch
CO

Lots of cool data.
Keep it coming
Sound and looks the odys are faster than pilots.

Well I think I have to call bulsyt on that one.
The Pilot has a 400cc Engine and the oddy a 350cc Engine.
If they are faster then someone's gota show that to me on a graph.
The only thing I can think of is that most of you guys are a lot fluffier than me. I'm 130 lbs. I bet some of you got dogs that weigh more. Also none of these machines are bone stock. There is something screwed on or gibbled together on every one.
Results in a few hours.
CO

Here are the results for the Death Machine.
First run I got a great hook up with no wheel spin.
Second run I got a bit of initial wheel spin.
Similar results to my machine. It rockets to about 30 mph and then falls on it's face and has to run up to 60 mph.
Couple guys out there with street bikes doing what I was doing LOL. Damn bikes are fast.
CO

Edit: You could overlay Death Machine 1 and My Machine runs and they would be the same.
CO

One thing I did notice was that if you get ANY wheel spin it just kills your time and speed.
Not sure whats going on there but I suspect that when the wheel spins or slips the revs come up and the clutch pulls in. Then when it bites the clutch and rpm falls on it's face. Then it has to recover but the rpms have tanked. Just a theory.
If you look close at those charts you can clearly see the initial wheel spin. The first 3 seconds are flat and then it climbs. It's noticeable on every chart.
I think you have to add a correction factor for wheel spin.
Adnoh might have the answer with letting out some rear tire air but wouldn't it drag the power down ?? Try riding a bicycle with low tire pressure. At the moment I'm running 6psi.
Anyways I'm done with this for now. Got to much on my plate.
CO

letting your tire pressure down is also going to affect acceleration by reducing the tire OD or is it? would you still be turning the same amount of rubber diameter per revolution? my head hurts

One other thing I would like to add here is that if you hold the brakes and floor the throttle you get wheel spin. If you just hit the throttle the launch is better.
CO

Good to know. Thanks for trying

What charts are you working on ----- if any ??
CO

Been logging data to do a few different items.
If you look at you post on the two about the same. I see a hugh difference in distance, time and speed. You may have posted wrong one by accident. Compare them in mph/time and speed. The app also showed a different type of scale as well. In your case you should start applying names when you get a chance.
Maybe start with B for brother and C for your. Then any important notes.
C, pavement run 1, 9-12-020. And so on.
I use 020 for year, if you just use 20 it can be manipulated like 2013,2024 etc. It's a an accounting night mare. If if you still write checks use 020 or year as a whole.

Let's look at a cut of death 1 and death 2
I cut to show times as an example.

What I see tells a story. For guys running woods quad chasing and woods utv chasing and dune running.
I know Co don't dune, so what should I choose in way of set up?
Now I can see how the simple data can be used.

It also showed me in way of top speed and distance how to gain an advantage over the faster machine. Look closer at the times compared to distance. Leave out mph. This would let me know in way of a driver how to lead and keep faster guys at Bay. This will also tell me how to give chase and picking lines. Follow the leader and use data to help me keep up or put it on them a little forcing them to over drive and gain the advantage.

I know this is not what were going to use data for or some may. I feel it can be used as a tool to select parts for a ridding area and budget. Like dive spring, why use one over another and it's effects. What pipe works best with what. Which new twin has the best bang for the buck.

The best of all, just plane fun for something to do. And a few bragging rights. Good camp fire fun. And shi_ hanging section have favorite cold one and laughing at the end of a ride.

I don't even know where you got those screen shots because I don't have it on my computer. I think I deleted those because they were aborted runs. Look at the speed, time and distance.
So you really can't use those.
CO

In this post you made, the big difference is the wheel spin. You can see that the first 3 seconds are flat. that's the give away.
CO

When ever you look at one of those charts you have to look closely at the first 3 seconds.
If the line looks flat --- Eg: It takes 3 seconds to get to 10mph --- then that's wheel spin.
Realistically you can pull 2 seconds of time off from any chart if you see that.
CO

EDIT sept 5th 10pm: Pull 1 second from the time.
CO

Here are the speed and corrected times based on wheel spin of my brothers machine.
Basically I removed 1 second from my brothers machine times for wheel spin.
Note how close the two basically stock machines are.
The way I see it right now, adding a pipe and carb does very little. You won't even notice it.

Ralph corrected times
10- 1.4
20- 2.8
30- 4
40- 4.5
60- 10
Mine
10- 1.6
20- 2.1
30- 3.1
40- 5.3
60- 16
Death Machine
10- 1
20- 2.3
30- 3
40- 5.1
60- 15.5

CO, I tried posting up yesterday afternoon and it would not let for some reason.
Anyway yes what you posted is close. What you don't see in your new numbers posted is the feet related to time and speed. One travels a farther distance for the time to reach a given speed. I may be misunderstanding the numbers. This week I will try to get a test sheet put together so one can this. May so I can see it correctly. My math skills work better on a computer than my phone.
Mean while, look at the pics of death one and two. Go to 30 mph. Add the three seconds. Look at the distance. The speed is the constant (30). You can add or subtract the time for wheel spin the distance will remain unchanged. How far travels to get to 30. This speaks to acceleration and power/ torque.
Basically point A to point B. Spin all you want.
This will not effect footage traveled for a given speed.

So what the chart should show based on the wheel spin is a for the three seconds ( wheel spin) a reduction in 25' ( rough math).
164-25=139' at 30 mph as a correction
The other machine is at 90'
139-90= 49 so one tracked 49 feet farther.
This is where a graph will show this for given corner distance etc. Now one can see the results of Engine porting, drive and driven set up, pipe no pipe etc.
Does that make since of not I may be all wet and messed up the data.
So if we break down the new number to feet per second we can calculate who get to the first corner quicker.

Well that makes sense to me now.
Just don't use those two aborted runs because I don't think there will be any good data there.
My math is suspect . Numbers can be twisted ---- just ask an accountant , but no way I will challenge any of your math.
Show us.
CO

CO, please do, I'm not always right.
I did a few quick calcs to maybe show what the spew is about.

It may show what I was saying.
What this does is put distance traveled and corrected speed for when the first car hit the corner. That being a assumed fixed distance to point B= 139'
The second pic will show where car two is when car one reaches point B with a 3 second correction for wheel spin.

Hope I didn't right, on phone and some head math and online calc.