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Old 12-09-2008, 09:13 PM   #1
turbobird14
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Default New to Open Source and need help

Hey guys please be easy with me, im learning how to go about this because my subi needs tuning badly! I have a few questions, are there any companies that will put together a map for you in order to get your car safely to a tuner? What is the difference between the tactrix 1.3 and the 2.0... other than the 2.0 is more recent technology. I just need to be put on the right track so i can get a tune for my car and learn to play with it as i go. Thanks for the help
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Old 12-09-2008, 10:28 PM   #2
wrxsti.l
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Most tuners will provide you with a base map to suit your mods so you can drive in closed loop to the tuner for further tuning.

1.3U supportsl non-can cars (01-07) while the 2.0 supports the same cars, plus newer can based cars from 07+. For a full list of supported vehicles, check the RomRaider or ECUFlash websites.
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Old 12-10-2008, 08:20 AM   #3
turbobird14
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And what is the advantage of going open source instead of say UTEC or Cobb? I see that this allows you to just buy a tactrix cable and away you go...with the software needed... but are there real advantages or disadvantages?
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Old 12-10-2008, 10:04 AM   #4
the suicidal eggroll
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Quote:
Originally Posted by turbobird14 View Post
And what is the advantage of going open source instead of say UTEC or Cobb? I see that this allows you to just buy a tactrix cable and away you go...with the software needed... but are there real advantages or disadvantages?
AP has real-time tuning (you can change some parameters of your tune while the car is still running, in real-time)
UTEC has speed density (no MAF required)

OS doesn't have these, but it's free. If you don't want to run speed density, and you aren't going to be doing a LOT of tuning (where real-time tuning would be nice), there's no real advantage to UTEC or AP. Personally I'm not a fan of piggy back systems period, so UTEC is out for me. I had an AP, but I sold it and went OS and never looked back.

As for OP 1.3 vs 2.0, apart from the supported vehicles there is more. Right now there are no extra advantages to the OP 2.0, but the hardware is there, it's just a matter of time before the firmware updates arrive that support these features. The OP 2.0 has a 3/32" serial input that allows you to log directly from an Innovate wideband sensor, without needing to run a separate wire to the laptop. Also, the OP 2.0 has a built in micro SD card slot that will allow the device to log directly to itself, no laptop required. When these 2 features are implemented, you will be able to attach a wideband directly to the OP 2.0, plug in a micro sd card, and go out logging without needing a laptop at all.
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Old 12-10-2008, 02:29 PM   #5
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thats sweet! so basically the 2.0 is very current in its technology right now. Now as far as companies that can get me a map... just a base map to get by for the time being... how do they go about that and who do u know of that i can get one - purchase one? is it a file that i am sent? i am looking at the rom raider and the ecuflash software but still not to familiar with it.. I will keep reading up on it to get more comfortable with it.
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Old 12-10-2008, 02:41 PM   #6
the suicidal eggroll
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There are many options

You can tune the car yourself, once you become comfortable with the different parameters you can change and what you need to do to accomplish what you want
You can go get dyno tuned at a local shop, so long as they will tune open source
You can get an internet tune, where the person sends you a base map, you log a bit and send them the log, they adjust the tune and send it back, etc.

The file that you're thinking of is a "hex" file (often called a rom), about 1mb, and contains your entire tune, everything about how the car runs, in 1 file. There are definition files that let whatever editing program you're using know how to interpet the hex file, and these are continuously being updated, with more tables added constantly. Apparently there are hundreds, if not thousands of tables that could potentially be changed, and as more of these are discovered/interpretted, they are added to the definitions so that you can make your own changes.

ECUFlash is used to read the rom off of the car and flash it back to the car
RomRaider (formerly known as Enginuity) is used to edit the rom

ECUFlash can also be used to edit the rom, but most people find the tools available in RomRaider easier to use, so they stick to that. They both do the same thing though, and have different features that you may/may not prefer.

RomRaider also has a logger, which will read various aspects of the car from the ECU in real time, so you can see what's going on with the car, letting you know what needs to be adjusted to give you your desired results.

An example of how you would tune would be this. Say you put a new intake on the car, the intake has provisions for the MAF sensor, but the air flow pattern through the MAF will be different than it was with the stock intake. The MAF sensor essentially outputs a voltage between 0 and 5v, that corresponds to how much air is flowing through it. There is a field in the rom that controls how the ECU interprets this voltage, it's a very large table that has 2 rows, one for voltage, one for flow rate. So the MAF sensor reads 3v, the ECU looks in this table, and determines that 3v means 100g of air. It now knows how much air is coming into the engine, so it looks at the injector scaler to determine how long it needs to open the injectors for to hit the desired air/fuel ratio. When you changed the intake, you changed the MAF scaling, so you need to update the ECU. Say at 3v, you used to have 100g of air, but with the new intake, you now have 110g of air. The ECU thinks there's only 100g, so it will add enough fuel for 100g, but since you actually have 110g, there won't be enough fuel and the car will run leaner (higher air/fuel ratio) than intended. What you would do to fix this is log the car while it's running. You would look at maf voltage, target air/fuel ratio, and the actual air/fuel ratio (from a wideband sensor). You will see a discrepency between the target and actual air/fuel ratio at certain MAF voltages, and you would adjust the MAF scaling for those voltages to compensate. After a few iterations, the MAF scaling will be nailed down, and you can move on to whatever other aspect of the tune you want to work on.

Last edited by the suicidal eggroll; 12-10-2008 at 02:49 PM.
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Old 12-10-2008, 03:36 PM   #7
turbobird14
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thats awesome! i appreciate all the info your giving me! what u wrote makes total sense! I would be interested in the internet tuning since i dont know when i will be able to get to a tuner because of my work schedule... what companies offer this kind of service? The only one i know of is Crawford Performance.
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Old 12-10-2008, 05:27 PM   #8
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A lot of the local guys here in SA are starting to use awdtuning.com, he's supposed to be pretty good, and just opened his shop. I'm not sure what else there are, as I haven't looked into it too much myself.
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Old 12-10-2008, 06:07 PM   #9
turbobird14
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i will have to look into him. Thanks
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