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that kind of scan gear is gonna run someone quite a tab, if it is even possible to get. like i said, it is gonna take a cooperative dealer, and that is more scarce than... well something that doesn't exist!
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Actually, hardware like USB DMMs to record voltage over time isn't expensive, though the data logging software can be. I believe you can even do logging with some TI calculators with the right kit. The problem might be syncing with an OBD II logger.
My 2009 Auto hasn't exhibited the problem at all, so I can't do any testing. |
Last time I was doing data logging with Uprev I noticed there were like 4-5 different VVEL things that you can log/monitor. If this would be useful to anyone, I can find out what things it can log. I can't do any useful logging though since I can't reproduce this problem either.
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Datalogging software isn't needed as long as the voltages can be recorded over time and stored in a comma delimited text file. I use open source library, ZedGraph, to graph data with several hundred thousands of points. If you guys like, I can write a simple program that uses this library to import individual csv files and plot them as separate graphs or overlays.
Datalogging with UpRev is one thing, but we need to acquire signals at the source (I/O control signals and driver output). The ECU and VVEL module output signals to control the throttle and VVEL actuators and each has its own position sensor, but I don't know the system well enough to determine if the control signal output to the actuator goes from A to B in X milliseconds that the actuator is expected to physically change positions from A to B in X milliseconds as well. In other words, we might have a situation where the control signal expects the actuator to move from point A to B. The actuator does move from point A to B, but there is no mention about how fast it should get there to meet the timing tolerance. It is like playing an FPS game with a wireless keyboard and mouse getting pwned from the 0.5s lag. |
But I think the 1-2s lag combined with it happening primarily when warm means it should be possible to narrow it down, just a lot of work.
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Does anyone have a scrap OBD-II cable they would be willing to mail me? I literally just need the cable to plug into the car. I will be breaking it out into a breadboard, so I preferably do not want it coming from something working. I have an NI 14 bit DAQ that will be perfect for this. |
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sound like you guys have a good grasp on this. good luck! Im very interested in the results if you can get any!
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I've not had time to write the graphing program. Once I know what the log file looks like, then I can write the code to parse the rows and columns of data.
Today ambient temps hovered around 65F for the high. With the engine bay cooler than usual throttle response is the way it should be. I can press the pedal close to 50% in 1st and 2nd and be able to get the car moving immediately with no delay. Of course, after a longer duration of the drive (15+ min.) the throttle starts lagging and doesn't open up as much as anticipated. I can floor it in 2nd and 3rd. The exhaust gets loud, but the car doesn't seem to accelerate much at all. It's very gradual as if throttle isn't opening up fully. Then I make a quick stop to get stuff. Get back in and get moving, and throttle response is normal again for several minutes. I'm not quite sure if Sprint Booster is going to fix this problem especially when I try to floor it and the car barely accelerates, but only when it's cooler. |
Heh... I'm pretty sure you guys are annoyed by my bump posts for this thread. I'm wondering if all this lack of response has to do with the current programming of the VVEL actuators. After doing some reading about the VVEL TSB for G37 owners, some owners were complaining that the reprogrammed ECM made the engine unresponsive. So for those who wonder about VVEL software adjustments, it is possible, but at the price of enduring the knocking noise?
Here's a quote and response: MyG37 - View Single Post - ITB08-028a - Noise from bank 2 VVEL actuator (amended 9/3/08) From FreshAlloy: Quote:
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^ Interesting
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If this problem were a dinosaur, it'd be a failaciraptor.
Count me in as someone w/ the lagging acceleration problem. |
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