Speed Chart within Lap Details

[escottc]

I think I had it showing speed differently at one time before. It now lists speeds of 4000 mph as the highest on the charts though it seems the speed readings are correct otherwise. : )

[Harry]

I'd assume there is a wrong value somewhere in either the lap's or the reference lap's speed. Please try two things: turn off the reference lap (press button in the top left). Double tap the chart to reset the zoom. If both do not help, please export the lap displayed to .hlptrl and send it to me for testing. Thanks!

- Harry

[escottc]

Tried those steps with no luck. However, after looking it over I think it might have something to do with my XGPS150A. Those are the only laps which show 4000 mph on the y-axis of the Speed chart. The other laps using internal iPhone 5 GPS all look good. Please know that I did update the firmware for the XGPS150A.

Side note: I haven't heard back from Dual to see if my XGPS150A is the 5hz version, but I'm guessing it is not because I'm only able to receive a max of 4hz. I'll probably send this one back, the second one I've tried, and order from the link you provided some place else on the forum. Getting a third one is a bit frustrating. Though things could be worse so I don't want to hit the complain button to hard.

Let me know if you needed a different ".hlpttrz" file.

Thanks for your time Harry. If you can please connect me with the cloning company you use, because you are everywhere all the time it seems, please let me know.

- Scott

[escottc]

Just noticed when submitting that the file wasn't allowed. I'll try it ZIPed.

[Harry]

I found one ugly OBD speed sample (6552.2 km/h) which scales the diagram as shown above.

Code: Select all

                        <fix index="7187">
                                <date>10-MAY-13,19:27:30.50</date>
                                <coordinate>38.936645,-77.058203,63.5</coordinate>
                                <speed>1.6</speed>
                                <positioning>2,2</positioning>
                                <satellites>10</satellites>
                                <direction>300.5</direction>
                                <hdop>1.01</hdop>
                                <accuracy>1.7</accuracy>
                                <relativeToStart>8181.7,10:42.50</relativeToStart>
                                <acceleration>
                                        <source>1</source>
                                        <lateral>-0.03</lateral>
                                        <lineal>-0.05</lineal>
                                        <coordinate>38.936657,-77.058194</coordinate>
                                </acceleration>
                                <obd>
                                        <rpm>842</rpm>
                                        <maf>3.77</maf>
                                        <speed>6552.2</speed>
                                        <throttle>0.01</throttle>
                                        <fuelLevel>0.00</fuelLevel>
                                        <coolant>99.0</coolant>
                                        <oil>0.0</oil>
                                        <map>0.00</map>
                                </obd>
                        </fix>

Removing this single fix results in what you expected:

iOS Simulator Screen shot 16.05.2013 07.35.15.png (49 KiB) Viewed 3209 times

iOS Simulator Screen shot 16.05.2013 07.35.01.png (119.11 KiB) Viewed 3209 times

OBD data does not come with a checksum, so sometimes wrong values from transmission errors find their way into LapTimer.

- Harry

[Harry]

And here is your fixed lap, just send it to LapTimer to import it. I have added LapTimer extensions to the file types allowed on the forum...

- Harry

[escottc]

Thanks Harry. A few more questions:

1. How to import .hlptrz files to Laptimer...DropBox, iCloud? and if I load it to Laptimer will that fix the problem?

2. Could my GoPoint ODB reader be defective?

3. Is there a way to to prevent this from happening?

4. I hope by "transmission error" you mean the radio signal of the devices and not my car's. I'm sure you meant signal, but just wanted to make sure. : )



- Scott

[Harry]

1. Send a mail including the file to yourself and open it on your iPhone. Long-press the attachment and select LapTimer to open. Remove your old lap, otherwise you have one uncorrected and one corrected.
2. No, do not think that is a general problem.
3. No.
4. Most connections starting at the physical sensor have some error checking, but somehow the bad value made it into the stream.

[escottc]

Thanks Harry. Just for some more clarification I have a could more questions:

4. Most connections starting at the physical sensor have some error checking, but somehow the bad value made it into the stream.

1. Is the "physical sensor" your referring to a sensor on my car itself? Is that something I need to look into getting fixed by a mechanic?

2. Just to note again, the MPH y-axis to 4000 mph happens for every lap that I use the external XGPS150. iPhone charts fine.

[Harry]

2. Just to note again, the MPH y-axis to 4000 mph happens for every lap that I use the external XGPS150. iPhone charts fine.

That sounds interesting For the lap you sent, one OBD fix had a wrong wheel speed, GPS speed (delivered by the XGPS) has been fine. Please check that again. In case every lap has a wrong OBD speed value, and only in case the XGPS150 has been connected (which should not have any influence on OBD data) , that would be pretty strange.

- Harry