Kevin (KPG) what I meant is that on your 60-130mph chart, the scale starts at zero and goes all the way up to 130mph. If you change the scale to start at 60mph and end at 130mph, one can see less of a flat line...Don't know if it makes sense, no big deal anyway.

Do you have the possibility to show the long Gs on the same chart as the speed on the 60-130mph run? That would be interesting.
Thanks.

 

Kevin:

Your numbers look like they are putting the hurt on my stage 4. I go from 68.8 mph to 130.1 mph in 8.524 sec. So, you beat me from 60 where I am starting from 69. Hmmmm!!!!! I was taking it to 7000 and shifting quick but no slamming.

In another lap I went from 61.9 to 130.0 in 9.821 seconds with 1 slow short shift (6000 rpm)but bottom line, you are spanking my fanny. HMMMM!!!!!

 

Tim , how are you measuring these times. The stock speedo is a joke. On my 60-130 runs I had to do 135 indicated on the speedo to get 130 GPS.

 

Jean, here are your 2 graphs. I apoligize but for some reason beyond my limited Vbox skills I could not get the axis changed on the 2 shift 8.59 sec 60-130 run. The 7.93 sec 1 shift 60-130 axis is scaled from 60. Hope this helps. Kevin

 

Kevin, mine is from my das and it is gps speed corrected.

 

Tim , I ran my best 60-130 time from 61.9 so we are comparing apples to apples. It was 7.78 sec. That is a little bit better than a 2 second spread. That is a lot of ground at these speeds, probably several hundred feet or more. Kevin

 

I think I am taking an extra shift (your pushing 4th gear and I am short shifting). Let me look at this some more.

 

Tim, if that is the case, the extra shift works out to about.4-.5 sec. I did my times with 1 3-4 shift as well as a 2-3, 3-4 shift. About a half sec difference between the two methods. kevin

 

Jean, sorry for the delay, but these are the correctly scaled graphs with the long G's. 1 shift and 2 shift graphs. Anything else let me know. Kevin

 

Safest way to get the times are at the dragstrip. It is a level surface so the data is accurate.Although you cannot skew the data with a downhill run because the 7 satellites watching your car keep track of the relative height of the vehicle anyway!Most lightly modified 996TT's will trap in the high 110's or the low 120's so it is just a matter of keeping your foot in it a bit past the traps and you have a safe, accurate 60-130 run. You dont lose your license this way either! You really need a GPS based timer to get accurate results though. I found with my Racelogic Driftbox that my dash speedo is off by 5 mph at some speeds.Once you have the data you can go back and see any time from any speeds with a click. It really is neat. Heck , it will tell you to the tenth of a foot the distance covered in any timed run. The US distributor is here in MI. 750$ Kevin

 

Damm cool man, yea once i put the new clutch in im hitting the strip, my car is putting out crazy numbers for what i have, and speedo videos show it I will try and borrow a racelogic driftbox from someone i know locally, or just try it out at the strip, you just ask them after for the data or what?

 

It wil show real time data on the screen. You have to program the parameters for 60-130. It only goes to the first decimal on the real time display, so you need to download the data to a computer to get the real hard numbers, but you will leave the track with a very good idea how you ran. If you need help with the data let me know, heck you can borrow mine if you like. I am interested to see some hard numbers from other vehicles as well. I hope more AX22 data is posted. Kevin

 

Kevin,

Thanks for posting the graphs, it is indeed clearer. The long Gs are quite similar with what I have seen on similar cars.

Sorry for going OT here, but I would like to put a word of caution...If you are on a slope, you will indeed see better times, also if your unit is not level mounted or calibrated, it can give you foul readings. I have seen many.
Don't forget that your device, is a mix of accelerometers and GPS, and the speed that you see is a compilation of both, not GPS only.

The only way to check this is through retrieving the run logs and do some calculations.

Just trying to say that none of these devices is foolproof, they have to be used properly.. Does it have the possibility of retrieving all the data on excel?

Thanks again.

 

Jean, I fully understand the capabilities and the limitations of the unit. I agree that numbers can be inadvertently misleading, but I think given the totality of the data, it is accurate. Dragstrip time systems are state of the art. The times slips only provide corroboration to the GPS data.If you would like further data, I am almost positive I can graph the relative height of the car to the satellites with this software. This will detail a level run. If that is what you would like to see let me know. Something tells me you are scratching your head over this one. As for the excel, I will check. There must be some function to dump raw data.Kevin

 

Kevin
I hope you understand that I am not disputing the data. I am just correcting your earlier statements by saying that errors due to slope or mishandling or calibration can be there and undetected to anyone, regardless of how good the device is. I am saying from experience that the only way to spot them (when they are not gross) is through the data retrieve and some calculations.
Cheers