Another vibration thread (this one's a little different) - 3000GT/Stealth International Message Center

92rtawd · 02-22-2007, 08:31 PM

I've seen some other vibration issues that occur at various rpms or with acceleration.

I'm having a vibration that is entirely speed dependent. It doesn't matter what gear or whether I'm even on the throttle. It starts vibrating at 85ish and gets aweful by 100. At 100 the car is shaking violently.

I do have a 1-piece CFDS. I've heard of some vibration with them, but I thought those vibrated from 8x-8x mph and then quit vibrating at faster speeds instead of getting worse. Is that right?

It does this on two different sets of wheels/tires.

What else can I check?

HydeDW · 02-22-2007, 10:07 PM

Did the symptoms you describe start post installation of the shaft?

I had a 1-pc that emitted a strange harmonic buss/drone that started in at around 100 MPH and progressively increased in DB level. I never took it much above 115 sustained as it was way to unnerving. I actually never thought it produced significant vibration felt through the car but the noise sure made it seem so. (I have a 2-pc now and that thing is silent and smooth at sustained high speeds and up to 140).

Anyone need a 1-pc? - perfectly fine for the street. The poor thing is just collecting dust in my garage since last spring

92rtawd · 02-23-2007, 06:27 AM

Quote:

Originally Posted by HydeDW

Did the symptoms you describe start post installation of the shaft?

I believe so. The problem is that my car hasn't been running much since I got the shaft. And when it is running, I don't go up to those speeds very often.

So I don't know if it started happening right after I put the shaft in or if something else has gone wrong since.

But its definitely more than just a noise. The car is vibrating pretty hard.

HydeDW · 02-23-2007, 08:23 PM

It certainly seems to point to your drive shaft as the probable cause. Countless others have reported elsewhere thier hit or miss experiences on the vibration issue. I suppose there are at least two things remaining to do. 1) Unbolt and rotate 90deg and re-test interatively to explore possibility that it may go silent for you. 2) Contact PST and go for a swap to the 2-pc.

Good luck - hope things work out.
Dan
97VR4

92rtawd · 02-23-2007, 09:57 PM

I noticed today it gets worse if the car is turning. If I even move the steering wheel a little, it amplifies the vibration.

Does that narrow anything down?

HydeDW · 02-23-2007, 10:22 PM

Quote:

Originally Posted by 92rtawd

I noticed today it gets worse if the car is turning. If I even move the steering wheel a little, it amplifies the vibration.

Does that narrow anything down?

I probably have misunderstood your last post.
So.. are you saying that you are out on open road - and traveling at say 85MPH+ (or when you are sensing the vibration) and then you nudge the steering a bit?

If true, then I am not able to rationalize that senario as I would think one would not be able to turn at very much degrees (sustained) at that speed or you would be sailing off road in pretty short order.

Dan
97VR4

92rtawd · 02-24-2007, 09:22 AM

Yeah, at 80-85mph on a 70mph highway. When the road curves and I have to follow it or when I switch lanes. Or even just an extremely small movement within the lane (barely putting any pressure on the steering wheel) I can just feel the vibration intensify.

92rtawd · 05-21-2008, 06:50 AM

Update: fixed by swapping to a 2-piece CFDS.

02-22-2007, 08:31 PM	#1 (permalink)
92rtawd Rock Chalk, Jayhawk Join Date: Dec 2003 Location: Bloomington, IN Drives: 92 Stealth TT Trader Rating: (7)	Another vibration thread (this one's a little different) I've seen some other vibration issues that occur at various rpms or with acceleration. I'm having a vibration that is entirely speed dependent. It doesn't matter what gear or whether I'm even on the throttle. It starts vibrating at 85ish and gets aweful by 100. At 100 the car is shaking violently. I do have a 1-piece CFDS. I've heard of some vibration with them, but I thought those vibrated from 8x-8x mph and then quit vibrating at faster speeds instead of getting worse. Is that right? It does this on two different sets of wheels/tires. What else can I check? __________________ AIR: WRX 13T turbos, Greddy FMIC, K&N Filter, A'pexi twin chamber BOV, Greddy Profec B, ESP downpipe, IPS single shot catback FUEL: Greddy E-Manage,Walbro 255lph pump, IPO hotwire kit, AEM AFPR, 450cc injectors SPARK: MSD wires, NGK plugs DRIVETRAIN: PST 2-piece CFDS, Centerforce dual friction clutch

02-22-2007, 10:07 PM	#2 (permalink)
HydeDW 3S Obsessed Join Date: Jan 2003 Location: Richardson, Texas Drives: 97 VR4 Trader Rating: (7)	Re: Another vibration thread (this one's a little different) Did the symptoms you describe start post installation of the shaft? I had a 1-pc that emitted a strange harmonic buss/drone that started in at around 100 MPH and progressively increased in DB level. I never took it much above 115 sustained as it was way to unnerving. I actually never thought it produced significant vibration felt through the car but the noise sure made it seem so. (I have a 2-pc now and that thing is silent and smooth at sustained high speeds and up to 140). Anyone need a 1-pc? - perfectly fine for the street. The poor thing is just collecting dust in my garage since last spring

02-23-2007, 08:23 PM	#4 (permalink)
HydeDW 3S Obsessed Join Date: Jan 2003 Location: Richardson, Texas Drives: 97 VR4 Trader Rating: (7)	Re: Another vibration thread (this one's a little different) It certainly seems to point to your drive shaft as the probable cause. Countless others have reported elsewhere thier hit or miss experiences on the vibration issue. I suppose there are at least two things remaining to do. 1) Unbolt and rotate 90deg and re-test interatively to explore possibility that it may go silent for you. 2) Contact PST and go for a swap to the 2-pc. Good luck - hope things work out. Dan 97VR4 __________________ Dan (3SI #37) Pearl White 1997 VR4 (117K 4/2007) Engine: 13T Turbos - Rob Beck engineered Engine: AEM EMS; GM 3.0 MAP, GM IAT, GM EBC, RC550's Intake: Dejon Hardpipes; Dual K&N Drive Train: RPS Carbon-Carbon Clutch; Drive Train: Kormex LSD; Drive Train: PST CFDS; Suspension: TEIN Flex w/EDFC; Brakes: StopTech ST40 brakes & 355x32MM AeroRotors® rotors (Front) SuperCar Engineering; Brakes: StopTech ST22 brakes & 328x28MM AeroRotors® rotors (Rear) SuperCar Engineering; Wheels: PIAA 18x9.5 FR-S w/45mm offset ;TOYO Proxes T1-R 18x275x35; Gauges: Defi-Link (EGT, Water Temp, Fuel Pres, Oil Pres, Oil Temp, Boost and Display); Gauges: 2 AEM WB02 (Left & Right Bank); Cooling: Fluidyne DB-30816 Front Mount Oil cooler (currently deinstalled); Cooling: 3SX Dual-Pass Radiator w/Flex-lite fans; Cooling: Waterless NPG+

02-23-2007, 09:57 PM	#5 (permalink)
92rtawd Rock Chalk, Jayhawk Join Date: Dec 2003 Location: Bloomington, IN Drives: 92 Stealth TT Trader Rating: (7)	Re: Another vibration thread (this one's a little different) I noticed today it gets worse if the car is turning. If I even move the steering wheel a little, it amplifies the vibration. Does that narrow anything down?

02-24-2007, 09:22 AM	#7 (permalink)
92rtawd Rock Chalk, Jayhawk Join Date: Dec 2003 Location: Bloomington, IN Drives: 92 Stealth TT Trader Rating: (7)	Re: Another vibration thread (this one's a little different) Yeah, at 80-85mph on a 70mph highway. When the road curves and I have to follow it or when I switch lanes. Or even just an extremely small movement within the lane (barely putting any pressure on the steering wheel) I can just feel the vibration intensify.

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05-21-2008, 06:50 AM	#8 (permalink)
92rtawd Rock Chalk, Jayhawk Join Date: Dec 2003 Location: Bloomington, IN Drives: 92 Stealth TT Trader Rating: (7)	Re: Another vibration thread (this one's a little different) Update: fixed by swapping to a 2-piece CFDS.