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Thread: Will this work?

  1. #1
    Newbie
    Join Date
    Apr 2007
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    12

    Will this work?

    I have been reading about the OBD II stuff and I wasn't sure about this and was wondering if anyone can help me out.

    I have a 07 Mazdaspeed 3 and Plan to put in a XP machine running RR. I would very much like to hook into the OBD for readings and such but I don't want to accidentlly mess something up.

    Will this work? also what software works well with RR? I searched and have some basic understanding but still unclear. Will USB provide real time readings or do I need to go serial?

    Thanks!

  2. #2
    Newbie
    Join Date
    Mar 2007
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    51
    I imagine that there's probably a failsafe on the ecu or scanner to prevent you from tampering with it esp. in monitor (or whatever they call it) mode.

    As for it's interface with RR you may need to code or have something coded for it. If it's plug n' play usb it shouldn't have any issue talking to XP. Weather or not you can get real time data i think depends more on the sender hardware and the receiver software than the transmission media (cable).

    Read the support documentation.

  3. #3
    Constant Bitrate
    Join Date
    Mar 2007
    Location
    Central Florida
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    156
    According to my OBD-II reader (Auterra Dyno-scan), except for resetting the CEL, it is totally read only. You shouldn't be able to mess anything up.

    Mine will output real time data and you can record it. However, there are limitations. If you try to record too much data, it will slow down the sample rate at which it takes the data.

    The absolute coolest thing about the Dyno-scan is the Dyno function. You have to do a little homework, first, like calculate the frontal area of your car, look up the drag coefficient, check the weather, that sort of thing. Once you load that in, you can do dyno pulls that tell you the horsepower and torque of your car.

    I'm in the process of fixing up my wife's car and I frequently do some runs, then make a repair and do some more runs to see if the repair helped or not. Check it out at www.auterraweb.com.

    No I don't work for them. Just a happy owner (although like all software, it has "features" which could be done better).

    Good luck.

  4. #4
    Newbie
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    Mar 2007
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    Just about anything will skew your dyno results though. Bumps in the road, hills, anything really.

    What it's measuring is how fast you accelerate vs how much you tell it your car weighs, frontal area, drag coefficient, and rolling resistance.

  5. #5
    VENDOR - OBDPros
    Join Date
    Mar 2006
    Posts
    359
    Quote Originally Posted by Krystm View Post
    I have been reading about the OBD II stuff and I wasn't sure about this and was wondering if anyone can help me out.

    I have a 07 Mazdaspeed 3 and Plan to put in a XP machine running RR. I would very much like to hook into the OBD for readings and such but I don't want to accidentlly mess something up.

    Will this work? also what software works well with RR? I searched and have some basic understanding but still unclear. Will USB provide real time readings or do I need to go serial?

    Thanks!
    Yes those will work, I also manufacture a USB scantool that works with most of the ELM software and supports higher speeds. Check out www.obdpros.com

    You can integrate any software package with RR as an external exe, so you should have no probelms USB will provide real time readings...

    Thanks
    Paul
    www.obdpros.com

  6. #6
    Constant Bitrate
    Join Date
    Mar 2007
    Location
    Central Florida
    Posts
    156
    Yeah, it's not perfect, but it's great for doing relative comparisons. The same thing can be said about a chassis dyno. Many cars today are sophisticated enough to know how much air is passing over the engine as well as through it. Car and Driver did a story on how a shop got a whole bunch of extra horsepower, out of a BMW simply by putting a larger cooling fan in front of it. You can find a link to the article on my website: www.ozone1000.com. If you do two equal condition back to back runs on a chassis dyno, you will more than likely get two different results.

    Elsewhere I saw that they got 10 extra HP out of a Porsche 911, by using premium gas. Lot's of things can effect any dyno and it's only as good as the guy running it.

    That's why I always do 3 runs, create an average, then make my modification and do 3 more runs to create a new average. I think this leads to better results.

  7. #7
    Newbie
    Join Date
    Mar 2007
    Posts
    51
    RE: chassis runs

    Of course you will because the engine will heat up after the first run, you'll bake your intake manifold and thus get a less dense air charge. Different dynos will correct differently and thus report different hp/torque specs. It can't be denied that a proper dyno has less factors altering results.

    Premium gas resists detonation better than midgrade or ****water, the ecu probably pulled timing (maybe even boost) from the 911 running on 90 octane or less.

    I agree with your 3x3 averaging though- and the unit & software probably costs less than a 3 run dyno session.

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