Jean , what I meant in the previous post was that there is a utility to detect relative height. Basically, I was stating that you can, and probably will be called on the data. You are correct that the average person cannot find a slope deviation error.This data can be mind numbing, I fully realize your passion for it now. Kevin

 

Jean, what are you looking for in the calculations that indicates a run is not valid?

 

Kevin,

Yes the data available with a simple device can be quite overwhelming. I removed my professional datalogger with all the sensors etc..to replace it with the AX22.

Here is a graph that shows the same car in 2 different runs that I consolidated together, with 2.4 seconds difference from 60-130mph. Miscalibration and/or slope, no way to pick it up.. After analyzing the raw data, turned out there was a slope in the faster run.

 

Ebaker, he is looking for slope deviations, a downhill run. As he stated , he is not disputing these numbers in any way. The Long G's are what he has seen and would expect for cars with numbers like these. Kevin

 

Jean , here is a graph of the 7.93 sec 60-130 run with relative height and distance. You will find a deviation over approx 1200 feet of 17 feet. I assume this is considered level by your standards? Kevin

 

Everything seems 100% good, there is no reason at all to think that these runs are not perfect. I like this feature in your logger (the altitude option)!

Ebaker, there is a certain time consuming calculation that can be done if you have all the data available the way the AX22 provides. It basically calculates the speed based on Gs...If the Gs give you a higher or lower calculated speed than the theoretical speed, it means there is tilt, slope or miscalibration. I will be happy to look into any data.

 

Jean, thanks. I have only scratched the surface with the capabilities of this software. I will try to figure out how to get you the raw data in some form or another, but I fear I may have to read the directions...GASP... in order to do it. I will get back to you. Kevin

 

Hey Kevin, of course man! I am so curious as well because the car is damm fast, also with all of your cars it would be really interesting to see! I have someone i know with it, hopefully it supdated or the same one, he thinks it is, BUT i will PM for help on how to use it

Martin

 

Here is some more detailed comparison data. You can only look at the long g’s or speed on separate graphs as they are scaled differently so be careful to compare the right things. Also, I would really like to see rpm data to make sure we are matching things correctly. When I am at the track, I tend to short shift and shift fairly quickly but not real fast as I am taking it easy on my car.

Here is a comparison of the long g’s (accel) from my car on turn 9-10 at Gingerman. It is pretty flat. As you can see, I am really getting outpulled in both gears. In my car’s defense, He is coming in with his foot to the floor and I am coming out of a turn so the initial accell difference is larger than it really would be. You can see his shifts look quicker, I am not sure if it is his shifting faster or quicker recovery of his higher sprung wastegates.





For the speed comparison, again, Kevin's initial advantage is overstated as I did not begin the test with full throttle. The 4th gear pull is closer





I also have some data from turn 4 into turn 5 at Road America. The beginning is pretty flat but the later portion drops downhill. You can see I get outpulled in third but we are roughly equal in fourth (here I am going downhill ).





When you look at the speed, you see the same thing. He gains on me in third but I can only stay even when going down hill.




Kevin, when you gonna have that thing in Chicago so we can visit and compare runs directly (to take out all the other variables to a meaningful comparison)?

 

Come on Tim, I already have the hard data- its your turn now. Go to the 1/4 mile and get a trap speed. I will have a dyno sheet Mon- put your car on the dyno as well. Get me 0-60, 30-50,50-70, 0-100, 60-130 on a GPS based data logger. Heck, I will send you mine if you want. I bared my soul for all to see- do the same Kevin

 

Tim, I am leaving for Gingerman in a bit. I have yet to try the lap data log feature but I am sure I will be able to show the same graphs at the same point on the track. As long as it doesnt rain. Kevin

 

C'mon man, that's what I'm doing, I'm dropping mr drawers here.

Like I say, you car sure looks faster and sure looks like it boosts much quicker. Don't get my conclusions wrong. I still want to do side by side pulls. That is my favorite test.

Hey now ... anything above a 1:32 is an excuse ... you know the target. LOL ... have fun.

 

You know Tim, with all due respect. After looking much closer at those graphs and at these speeds, the distance on track would amount to hundreds of feet. That is quite a differential. Kevin

 

Actually, I might like to test your box. That way we at least remove equipment differences. I think I'd be up for that.

Kevin ... what part of "I think you car is spanking mine!" are you confused by?

I can do distance measures (instead of time) as well. This might be interesting.

 

You're just being mean and nasty now! I have a stock suspension and you have Motons. Your car is an honest to god track car, my wife still takes this to Starbucks. OK 1:32 is the goal, but you still have a 1/4 mile time to beat as well. Offer still stands, I will meet you half way for lunch. Kevin