OBD Update Rates with KiwiWifi

Discussion related to external OBD sensors
Atomic Lutin
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Re: OBD Update Rates with KiwiWifi

Postby Atomic Lutin » Mon Oct 24, 2011 3:33 pm

Not enough money to buy a 997 ph2 :mrgreen:


Gernby
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Re: OBD Update Rates with KiwiWifi

Postby Gernby » Tue Oct 25, 2011 4:07 pm

I'm new to the forum, so I apologize if this has been discussed, but has anyone tested different mounting locations for the Wifi devices within the vehicle to reduce drop-outs? As a telecom engineer, I suspect the WiFi connection would be much more stable if the both devices were near windows to reduce the amount of "echo" caused by the metal chassis.


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Harry
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Re: OBD Update Rates with KiwiWifi

Postby Harry » Tue Oct 25, 2011 5:20 pm

Please check this thread on the line drops: viewtopic.php?f=6&t=284
Seems this can be fixed soon. Please stay with the update rate benchmarking in this thread.

- Harry


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Gernby
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Re: OBD Update Rates with KiwiWifi

Postby Gernby » Wed Oct 26, 2011 3:23 am

My KiWi WiFi and 2008 Honda S2000 shows an OBDII rate that moves around, but averages about 10 Hz.


LAWLence
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Re: OBD Update Rates with KiwiWifi

Postby LAWLence » Tue Nov 22, 2011 4:47 am

Harry,
First of all, great product. Lap times this past weekend were within .01 of an AMB transponder.

I have a problem with the OBD update rates. I'm using a TomTom GPS mount. Everything is updating at 1Hz when I looked at the data file (exported to Dashware format). The amount of interpolation is disappointing, especially for throttle and RPM inputs.


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Re: OBD Update Rates with KiwiWifi

Postby Harry » Tue Nov 22, 2011 7:26 am

Hi,

You need to differentiate between the OBD rate delivered (and benchmarked in this thread) and LapTimer's storage scheme. In fact, LapTimer joins all the sensor streams and maps them to the GPS stream. So if GPS update rate is low, all other data stored (acceleration, OBD) is stored at this low rate too. There are more sophisticated solutions thinkable, agreed. To work around the issue named, you may go for a higher update rate GPS device like the Emprum Ultimate or the Dual XGPS (support added starting with LT 14.4).

- Harry


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LAWLence
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Re: OBD Update Rates with KiwiWifi

Postby LAWLence » Tue Nov 22, 2011 9:47 am

I see what you're saying. I don't plan on buying any other GPS units for the iPhone (I will probably move to a dedicated AIM data logger). I have used other apps that acquire OBD/accelerometer data at their normal rates despite the 1Hz restriction on the GPS. This means there is less interpolation of non-GPS data which is helpful in data analysis.


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Re: OBD Update Rates with KiwiWifi

Postby dotframe » Tue Dec 20, 2011 3:40 am

2003 Porsche C4S, seeing 1.5-1.6Hz with KiwiWifi on a Iphone 4s.

I wish it was faster but I guess for the price I couldn't be happier. Can't wait to get to the track with this setup!
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cgroppi
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Re: OBD Update Rates with KiwiWifi

Postby cgroppi » Mon Jan 16, 2012 9:14 pm

I get 1.5 Hz update rates on a 2007 BMW M Coupe using the Chinese knock-off Kiwi Wifi.

I had some issues getting the unit to connect at first. I was able to connect with Fuzzycar and read data, but took me many tries for Lap Timer to show data. It would connect, but show a 0.0 Hz update rate. Now, for whatever reason, it seems to work. Sometimes I have to reconnect to get Lap Timer to see the data. Fuzzycar works almost every time. I don't know why that difference exists.


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Re: OBD Update Rates with KiwiWifi

Postby orthojoe » Tue Jan 24, 2012 11:51 pm

I get 3hz on my 2008 Mitsubishi evolution X, and 3hz on my 2011 Porsche Boxster Spyder.

Both of these cars use CAN bus protocol. From my understanding, CAN bus protocol should be able to output 20-40hz. Is the slower update a limitation of the kiwi wifi or the iphone?



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