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Thread: 62 samples per second OBDII logger? Check this..

  1. #1
    Maximum Bitrate pyros's Avatar
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    62 samples per second OBDII logger? Check this..

    http://www.sctflash.com/raptor.php

    its only available for fords (yay for me) but I'm assuming thats just the software limitation.

    The point is, they claim 62samples/second on an OBDII vehicle but I thought obd2's specs are limited to 10 samples per second?

    Can someone shed some light on this please?

    Thanks
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  2. #2
    Variable Bitrate
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    Yeah every time i looked into this, i found OBD II rates limited to 10Hz. If its possible to get higher rates somehow via the OBD II standard, that would be cool...i wonder how this box does it?

  3. #3
    Maximum Bitrate kiltjim's Avatar
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    Since it is Ford specific, they can do whatever they want.

    The port on the cars may be putting out information that fast, and the scanner is just tuned to pick up on it. Whereas the normal scanner available is tuned to use the standard 10 Hz. This would work if the Ford port was putting out the code in some multiple of 10 Hz, that whenever the normal scanner caught up, it managed to catch the next code it was looking for.

    It could also be using some handshaking procedure available in Ford cars, and not a standard type communication protocol.
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    Variable Bitrate
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    I wonder if perhaps my Mazda ECU is able to do the same (got ford labels all over it..)... pile of **** has got to be good for something!

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    Raw Wave god_of_cpu's Avatar
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    That kind of refresh rate all depends on what kind of protocol your vehicle supports. Anything using the PWM protocol is capable of 30+ updates / sec with the right reader hardware. If you have ISO on the otherhand, consider yourself lucky if you get anywhere near 10 updates / sec, expect more like 2-5.

    If there saying thier product is just for fords there probably using a ford specific protocol thats dependant on special hardware that uses the same OBD II port but probably utilizes different data lines so its technically not OBD II, but functionally you can get all the same data out and usually a lot more ford specific things. You can get high framerates strictly with PWM if you wanted to use something somewhat OBD II compliant, even though trying to read something at greater then 10 updates / sec is a violation of the OBD II standard, you can still often do it.

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    Raw Wave god_of_cpu's Avatar
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    Quote Originally Posted by Dexter
    I wonder if perhaps my Mazda ECU is able to do the same (got ford labels all over it..)... pile of **** has got to be good for something!
    Depends on what make you have... If you have ISO, no, if PWM, good chance. Regardless, it may still be possible if you step outside of OBD II protocol, but be prepared to shell out big $ for it.
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  7. #7
    Variable Bitrate
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    Its most definetly ISO..damn. Oh well. not worth it.

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    Variable Bitrate lerandell's Avatar
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    wow. I didn't think I would see anyone else looking at this unit on this board. I am about to build up a 450 Hp 5.8L for my truck and I am looking at using this unit along with another part that can re-burn or reprogram the ECU. I will add the application to my carPC.
    the unit I am looking at goes for $800.00. here is some info from the web site:

    SCT gives you Full Control of over 320+ Parameters. Every available PCM has the same level of control!!!

    Works with all Ford 96-04 OBD-II Vehicles

    Lightning Fast 62 samples per second

    View Data Live or export saved data to other applications

    Support for 4800+ Ford PCM’s

    NOTE: this is if you buy both parts not just the USB Raptor.

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  9. #9
    FLAC Chairboy's Avatar
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    OBD-II is a request protocol, as in, the reader says 'HEY! Car, tell me about item 153.' The car says "Here's the data on item 153." A fraction of a second later, the reader says "HEY! Now I want to know about item 154" and the car says "Ok, here's the data on item 154."

    The original spec was for 10 samples a second, and there's nothing to stop Ford from making systems that support higher data rates, it'll always be compatible because as long as it supports 10hz at 4800, it's OBD-II.

    The key to remember is that the OBD-II port isn't just broadcasting info, you have to ask for something specific, that's why most OBD-II readers have you toggle items to read on and off. If you don't care about the RPM and Speed, then getting rid of those makes the others update faster, etc.

    This is also why you see occasional discussions asking if you can hurt your car by having an OBD-II reader hooked up all the time. So far, the answer is pretty uniformly no, but there have been intermitten reports of a car running weird after having a reader connected to it for too long, but that's super rare/hard to back up.
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    Newbie jyaron's Avatar
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    Quote Originally Posted by pyros
    http://www.sctflash.com/raptor.php

    its only available for fords (yay for me) but I'm assuming thats just the software limitation.

    The point is, they claim 62samples/second on an OBDII vehicle but I thought obd2's specs are limited to 10 samples per second?

    Can someone shed some light on this please?

    Thanks
    It's probably Ford hi-speed PWM mode @ 16ms sampling (physical addressing)

    GM also has a dynamic PID hi-speed VPW mode @ 25ms sampling (physical addressing)

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