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Post your Dragy times.
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Yeah my dragy is right on my strip time(s) AND the Cobb AP in my Raptor, so the dragy is a very good tool.
Maybe the dragy isn’t connecting to enough satellites, or it’s just “off” due to calibration error
Also, if the dragy isn’t mounted securely OUTSIDE the vehicle, it will sometimes return goofy results. In the ExpST I stick it on the roof near the drivers door as the car really hoists the nose up under max acceleration. The Raptor has no ferrous metal in the body, so I have it mounted in the tray on the dash so it gets full view of the satellites most of the time. I’ve never had a problem that wasn’t operator error!
Maybe the dragy isn’t connecting to enough satellites, or it’s just “off” due to calibration error
Also, if the dragy isn’t mounted securely OUTSIDE the vehicle, it will sometimes return goofy results. In the ExpST I stick it on the roof near the drivers door as the car really hoists the nose up under max acceleration. The Raptor has no ferrous metal in the body, so I have it mounted in the tray on the dash so it gets full view of the satellites most of the time. I’ve never had a problem that wasn’t operator error!
They were the same runs and it was at a track. Time is different because one of them is a screenshot I took to upload. I've had slopes be off at tracks lots of times. I've never consistently had the times be this far off tho. On my previous car I had probably 300 ish drag strip runs while dragy was running.
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The time you are looking at in my first post is the time I took the screenshot. In the post directly above your post is a screenshot of my dragy log, which if you look at the dragy time for the one I posted in the first post, it is within two minutes of the time stamped onto the timeslip.
Your post is basically saying either I'm a liar or full of s**t, what I am proving is that you are wrong.
Your post is basically saying either I'm a liar or full of s**t, what I am proving is that you are wrong.
I didn't call you either of those things! I just didn't see the point of showing what you did as evidence. So if you were offended, then I apologize. Now on to why the times may not be the same- GPS is only accurate to about 5 meters or worse depending on the signal and many other variables. So it's approximating the end of the quarter and the speed. I don't own a dragy, but I assume it's triggered from an accelerometer when you take off. That introduces perhaps some triggering error. Given those variables, it would be very unlikely that it would produce the exact same results you'd get from breaking the lights at the beginning and end of the strip- other variables include roll-out (distance to beams on launch). I'm amazed it's actually as accurate as it seems to be from other's anecdotal observations.
Edit for the math-
So, we could theoretically be off a maximum of 32 ft in measuring the 1/4 mile. That would result in a 2.42% change. Using a 12 second quarter mile run, we could potentially be off by .24 * 12 or .29 seconds in measuring the distance. Adding in the vagaries of when the timing starts would easily explain the differences you see.
Edit for the math-
So, we could theoretically be off a maximum of 32 ft in measuring the 1/4 mile. That would result in a 2.42% change. Using a 12 second quarter mile run, we could potentially be off by .24 * 12 or .29 seconds in measuring the distance. Adding in the vagaries of when the timing starts would easily explain the differences you see.
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No worries, just trying to figure out why it's so far off.
I've used it in previous vehicle at milan, US131, kentucky dragway, summit, dragway 42, marion, national trails and a few other I'm forgetting. The only place it was consistently off was marion, but that is pretty far out and my phone rarely even got reception there. Every other track it was almost always within 6 hundredths. I always attributed the 6 hundredths difference to dragy starting as soon as the vehicle moves vs timing at track starting when the wheels leave the beams. The rare times I would deep stage, it would be more like 2 or 3 hundredths within the time slip.
Before I went to the track in the ST, I felt like my street runs weren't accurate but didn't know for sure. A lot of times I would be brake boosting and the rears would start spinning, so I thought maybe that was throwing it off.
At the track I've tried launching from idle just to try to rule out vehicle movement.
Three years I've had my dragy and they are typically consistent with ET's on the slips. Really just curious if anyone else had seen the same thing with their ST or maybe I should try buying a new dragy or if it is just something with their satellites?
I hate throwing money at a problem if I don't know it will fix it....but it's hard to trust my street run results when they are so far off at the track.
I installed my whipple IC today, then I uploaded the updated tune from 5 star. I then went to my favorite "mexican" road and made 2 more passes with the dragy.
I noticed I'm getting a 1.90 60' time. Not bad for a 4600 lb SUV with stock suspension and tires. Also a 12.59 is not bad for just an I/C and a 5 star 91 I/C tune. I have a ZFG tune, but I won't make any serious passes until I get it loaded, data logged and dialed in. For now I'll run the generic 5 star tune.
I noticed I'm getting a 1.90 60' time. Not bad for a 4600 lb SUV with stock suspension and tires. Also a 12.59 is not bad for just an I/C and a 5 star 91 I/C tune. I have a ZFG tune, but I won't make any serious passes until I get it loaded, data logged and dialed in. For now I'll run the generic 5 star tune.
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