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Rattle or shudder on full throttle high RPM accel..
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01-06-2009, 09:21 PM | #23 |
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yeah I just bought it. My cousin is a GSM at a bmw dealer and (you wont believe this but) I got it for 24,700. Its nearly fully loaded and has 31k on it. Im so happy about it. thanks for the advice btw
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01-06-2009, 09:23 PM | #24 |
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The only thing that suffered from my indecision is the loss of my vs8's. They are being shipped out tomorrow. They were in perfect shape and now they're gone
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01-06-2009, 09:25 PM | #25 |
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01-06-2009, 09:27 PM | #26 |
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no kidding...Im shocked. I never would have thought I could get it this cheap. This all happened today. My cousin told me in the morning and I had to do it right away. awesome.
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01-06-2009, 09:57 PM | #27 | |
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So this is affecting both JB3 and Procede V3???
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01-06-2009, 11:00 PM | #28 | |
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Noticed it with the JB3 1.2 revision under map 6. I think perhaps it's related to the lag fix extra boost. Might explain why Procede owners are hearing something similar. |
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01-06-2009, 11:43 PM | #29 |
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Does it sound like growling 4x4 tires, modulating? I think thats pretty common with higher boost levels. My guess is its something in the intake tract that resonates at times. Especially on the left side of the engine.
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01-07-2009, 12:00 AM | #30 | |
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Left side would suggest the intake side....I have dual cones on. Seems related to high boost/high load conditions, but I never heard it on previous versions prior to 1.2. If it's common to high boost levels then I guess it could be resonating into the intake tract from the turbos, but it's such a low frequency that I don't think it's originating from them. Maybe the wastegates aren't quite sealing under high boost demand and this creates a harmonic sound wave of a particular frequency? |
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01-07-2009, 06:44 AM | #31 | |
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01-07-2009, 10:12 AM | #32 |
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I feel so much better now that I know its not just my car and that its probably okay. I still would rather not have it but oh well. I now need to figure out the awful idle and misfire. It feels like its going to stall out. I hate the fear Ive given myself of going to the dealer. whatever happens happens. I love this forum
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01-07-2009, 02:57 PM | #33 | |
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But I am not so quick to conclude that this noise is OK. It certainly doesn't sound right to me and it sounds like something is strained. Perhaps over time we will get to the source of it with the help of others on this forum who identify with these symptoms. |
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01-07-2009, 03:22 PM | #34 |
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I too am glad I am not the only one noticing this. I feel a bit better that others are hearing the same noise, but it does seem strained, and I can't help but be a little concerned..
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01-07-2009, 03:55 PM | #35 | |
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I agree, it doesnt sound good to me either. Hopefully well all get an answer towhat is causing this noise. |
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01-07-2009, 04:28 PM | #36 |
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I think the confusion here is that there are 2 separate issues. Some people are hearing a roaring/groaning sound. Which I don't think is the issue.
The OP mentioned a rattle and SHUDDER. Doesn't seem like anyone else is experiencing a shudder which goes beyond the audible symptons. It's a vibration, hesitation, shudder from the engine bay. That sounds like detonation, & not the normal groaning the others are hearing. |
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01-07-2009, 04:30 PM | #37 | |
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01-07-2009, 07:03 PM | #39 | |
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01-07-2009, 07:05 PM | #40 |
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Yes, just induction noise. It will be more obvious with dual intakes than stock airbox. This is, of course, assuming that we are talking about the same roar. This does not apply to those who are hearing rattling, getting shudders, hesitations, etc.,
Shiv Last edited by OpenFlash; 01-07-2009 at 09:56 PM.. |
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01-07-2009, 07:39 PM | #41 | |
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Mine is a definite groaning at high boost/high load low rpm's, but sometimes I think it's coming from the front and sometimes from the rear. I often wonder whether it's the e-differential straining with the torque because there is a little bit of a shudder to it. My car has traditionally swerved to the left when losing traction and the noise also emanates from the left. It doesn't feel like detonation because there is no lack of power or timing being pulled. In fact the engine feels very strong. It just groans on the inital takeoff. I have felt timing pull back on the race map and there is a definite performance reduction and sluggish acceleration when this happens. This feels nothing like that. |
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01-07-2009, 08:09 PM | #42 |
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You sure you are not runing the NASCAR version of the maps? I only ask because in NASCAR the cars go in ovals always turning left, and they do groan a lot too...
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09-30-2010, 09:37 AM | #44 |
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I think it's the low pressure fuel pump. I had this same sound that seemed to come from the left rear under wot. Just a groaning sound. I took it in and they replaced my low pressure fuel pump (in the fuel tank). Hasn't happened since.
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