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      08-13-2013, 12:08 AM   #1
Cruiserweight
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Vibration on WOT acceleration

Hey guys,

Got my first 335 about four months ago, and have factory warranty left for about two more weeks. I got a COBB AP, some VMR w/ PSS's, and BMS OCC installed and have put some decent miles on after install. I'll start by saying the N54 is a BEAST!

I've been noticing vibration from the rear end on WOT usually around 2500-4,000 RPM. Not a consistent vibration, it comes and goes. I feel pretty certain it's not wheel hop, but not positive.

I know this is pretty vague. Anyone have ideas of what the source might be? Bushings, Transmission?? Going to flash back to stock settings to see if I can reproduce it, and bring it in.
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      08-13-2013, 12:10 AM   #2
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BTW,

Ran some logs and sent them to COBB. They look good (mild timing pulls, nothing really stood out), no codes thrown.
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      08-13-2013, 05:37 AM   #3
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Torque coverter?
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      08-13-2013, 07:52 AM   #4
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Hub centric rings installed? Tires good?
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      08-13-2013, 09:39 AM   #5
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Hi, first post. Quick question what does WOT mean? Thanks
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      08-13-2013, 09:52 AM   #6
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same thing happens to me when im merging on the highway, i just attributed it to a bent rim
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      08-13-2013, 09:57 AM   #7
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Quote:
Originally Posted by ronokenneally View Post
Hi, first post. Quick question what does WOT mean? Thanks
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      08-13-2013, 10:32 AM   #8
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Quote:
Originally Posted by Rat_House View Post
same thing happens to me when im merging on the highway, i just attributed it to a bent rim
A bent rim would most likely vibrate at all times above a certain speed.
If you don't feel vibrations cruising on the highway it's most likely not a rim, I had bent rims on other cars a few times in the past.
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      08-13-2013, 10:47 AM   #9
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I'd be shocked if it was the wheels. New wheels/tires have maybe 2,000 miles, and I'm very careful with them. Not sure about the hub centric rings. I switched the wheels, and it seemed pretty basic. Remove bolts, remove wheel, set new wheel on hub, replace bolts, tighten to torque spec, drive on. . . Right?
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      08-13-2013, 10:53 AM   #10
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When my axles went the first symptom was vibration on acceleration. But I was at pretty high power levels.
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      08-13-2013, 10:58 AM   #11
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Quote:
Originally Posted by onebadmofo View Post
When my axles went the first symptom was vibration on acceleration. But I was at pretty high power levels.
If not a bent rim, this would be my next guess. in my case 25k miles though
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      09-04-2013, 09:47 AM   #12
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Wide open throttle
Ah.. Thanks
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      09-04-2013, 10:51 AM   #13
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Only one way to know if its the wheels. Put the stock back on.

As far as hubcentric rings they may be necessary. They keep the wheels in the center of the hub. Some wheels have a center hub with the correct sizing. Others use a universal size and require a hubcentric ring.
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      09-04-2013, 11:29 AM   #14
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if you let go of the accelerator and it is not vibrating, it is not the rims.

I think you have a bad injector, anyway something related to injection. if you can reproduce at will just have the dealer diagnostic the issue and fix it.
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      09-04-2013, 10:52 PM   #15
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I had the same exact issue, was a belt in the tire that moved under wot load. Changed tires, smooth as glass
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      09-06-2013, 09:49 AM   #16
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^seconded, i had a tire that was causing all kinds of road vibration at freeway speed, replaced and the vibration is gone
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      09-06-2013, 10:56 AM   #17
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I feel something similar on lets say gear 4 and speed 60kmh then WOT small vibration also few other members on 1addicts felt this. BTW I have COBB also.

Can it be a bit slipping clutch? Or maybe it is COBB related?
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      09-10-2013, 09:45 AM   #18
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Update:

Flashed back to stock, and it was still present. Car runs very smoothly under most conditions, and I feel very certain it's not wheels/tires as the vibration happens only and very specifically during WOT at specific RPM's.

Took it to the dealership (under warranty) and got 6 new injectors! SA told me they found an erratic spray pattern and replaced them all with 079's. Problem got better, but not gone, so I took it back. I checked my fuel pumps via COBB AP while WOT and pressures seem to ramp up and hold well, so I don't think my pumps are going bad. My car has 34k miles on it and I have a feeling it's plugs (got a new set of Bosch's sitting on my desk), but the dealership wont replace them since I don't have enough mileage to warrant it (so dumb).

Dropped it back off last week and the SA was talking about walnut blasting, etc. IMO, if they want to do injectors, then walnut blast, then coils, then plugs, in that order, great for me! Seems really stupid, but I'll take it. No call from the SA in 5 business days, I'll update when I get more news. If it's plugs, I'm going to crack up.
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      09-10-2013, 10:17 AM   #19
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Quote:
Originally Posted by Cruiserweight View Post
Update:

Flashed back to stock, and it was still present. Car runs very smoothly under most conditions, and I feel very certain it's not wheels/tires as the vibration happens only and very specifically during WOT at specific RPM's.

Took it to the dealership (under warranty) and got 6 new injectors! SA told me they found an erratic spray pattern and replaced them all with 079's. Problem got better, but not gone, so I took it back. I checked my fuel pumps via COBB AP while WOT and pressures seem to ramp up and hold well, so I don't think my pumps are going bad. My car has 34k miles on it and I have a feeling it's plugs (got a new set of Bosch's sitting on my desk), but the dealership wont replace them since I don't have enough mileage to warrant it (so dumb).

Dropped it back off last week and the SA was talking about walnut blasting, etc. IMO, if they want to do injectors, then walnut blast, then coils, then plugs, in that order, great for me! Seems really stupid, but I'll take it. No call from the SA in 5 business days, I'll update when I get more news. If it's plugs, I'm going to crack up.
Tell them to check is there no oil leek between gearbox and engine if so they have to replace clutch and rear crankcase gasket which is not cheap. Make them do this while you covered.
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      09-10-2013, 11:22 AM   #20
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I had the exact same problem... it was the plugs.
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      09-11-2013, 01:31 PM   #21
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Picked it up from the dealership today. They did the carbon/walnut cleaning. Just like I've read in many posts. . . it's super smooth now. They said the buildup was pretty bad for only 34k miles. Going to take it home, drop in some new spark plugs, and re-install my COBB. Make sure it's still smooth, then In goes my DCI and ETS 5" IC.

Then it's off to the 1/4 mile track to smoke my buddy's B8 S4. He's been taunting me lately.
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      09-11-2013, 03:17 PM   #22
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Good stuff.

I think it's coming to the point where carbon cleaning is needed at a 30,000 mile interval for this platform. Many guys at 30K are showing a noticeable build up by that time.
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