I AM BOOSTED...but I have vibration ;) - Page 3 - Miata Turbo Forum - Boost cars, acquire cats.

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Old 09-25-2013, 11:06 AM   #41
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My downpipe rubs my transmission just enough to buzz/vibrate from 2500-3000rpm. check that. It can be fixed by bracing it I'm just too lazy. Even if theres a small air gap it could probably still flex just enough to rub.
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Old 09-25-2013, 11:09 AM   #42
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Unless you've driven a boosted car with no exhaust, you probably shouldn't be saying that pinpointing that as a very real source of big vibrations is retarded.

His PPF may very well be out of alignment. I wouldn't be able to tell if that was causing the vibrations or not in a car that didn't have any exhaust under hard acceleration.
can we nail down the definition of 'no exhaust'?

he's said he has a downpipe, so does that mean he's driving around with an open exhaust pouring carbon monoxide into the car?
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Old 09-25-2013, 11:30 AM   #43
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you probably shouldn't be saying that pinpointing that as a very real source of big vibrations is retarded.
+1. as someone who has.


but last time I started getting vibrations in boost my driveshaft fell off.
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Old 09-25-2013, 11:34 AM   #44
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Thanks Thursday, I would have never thought open piped would have caused vibrations, I'm planning on getting one but I wanted to crank so I skipped out on it lol
I'm glad you understood what I meant. Just start eliminating one thing at a time. Good luck either way.
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Old 09-25-2013, 12:28 PM   #45
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Okay so the Begi downpipe looks like it my be rubbing against the tranny but it's in a spot you can barely see, I'll try and bend it and see if that helps
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Old 09-25-2013, 12:29 PM   #46
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The PPF checked out okay btw
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Old 09-25-2013, 01:01 PM   #47
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Okay so the Begi downpipe looks like it my be rubbing against the tranny but it's in a spot you can barely see, I'll try and bend it and see if that helps
Try jamming a piece of rubber in there to see if it makes a difference.
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Old 09-25-2013, 03:21 PM   #48
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Originally Posted by rhysmate View Post
can we nail down the definition of 'no exhaust'?

he's said he has a downpipe, so does that mean he's driving around with an open exhaust pouring carbon monoxide into the car?
Thinking something along these lines. If the exhaust ends with the downpipe then it's no wonder he is getting some weird noises. There isn't much room for a larger downpipe to go past the transmission and if it's not connected to some sort of exhaust to hold it in place then it's gonna move around and bang into something.
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Old 09-30-2013, 09:11 AM   #49
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My guess:

Worn/loose engine mounts allowing movement and contact. I bent the steel support on my OEM mounts when I took the car to the local drag strip. The mount was allowing lots of movement and caused the exhaust to contact the subframe/chassis when under load ... caused all sort of NHV issues.

Wouldn't be a bad idea to check your driveshaft u-joints, though I think you'd notice that in other situations.

-Zach
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Old 10-02-2013, 06:41 PM   #50
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I had a similar problem when I threw on my BEGi setup. The BEGi downpipe should allow for some wiggle room if you just loosen the downpipe to turbo bolts and move it with your hand. Try to shift it away from the transmission and see if that cures your vibration.
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