High RPM vibration all gears - ZR-1 Net Registry Forums

USAFPILOT · 08-11-2010

I first noticed it in third, but am now feeling it in 1st and 2nd. Maybe I didn't notice it before or it is getting worse.

I get a strong vibration which comes on at 6500 RPM or so and keeps getting stronger the more I keep my foot in it.

I am certain it is from the drive train somewhere. I feel it in the shifter mostly. Is my trans or clutch gonna puke on me soon? The car has 50,000 miles.

I'm taking ideas.

gbmidyear66 · 08-11-2010

When I first got my car I noticed drivetrain vibration @ RPM, and I noticed that when I really got on it I could see the shifter height modulate by close to an inch.

Turned out that the transmission mount bolts were simply loose and this is a common situation.

Hope that is your case as it is a cheap fix

tf95ZR1 · 08-11-2010

I agree, tighten everything up, but don't overtighten.

A26B · 08-11-2010

Quote:

Originally Posted by tf95ZR1

I agree, tighten everything up, but don't overtighten.

+1, especially the c-beam bolts on the rear of the transmission. Overtightening will compress the tailshaft bushing & wear it out.

+1 on ZFDOC's beam plates. mmmmm good, I like 'em.

USAFPILOT · 08-12-2010

Well Rick and I sorted most of the problem out, but maybe not the underlying cause.

I had the shifter knob incorrectly installed so we fixed that and most of the audible noise is gone.

I still have a cracked plastic piece where the allen screw seats into the shifter which is making noise but not much.

And, there is still a pretty strong vibration coming through the shifter at high rpm.

It is doing it whether I am in gear or not.

We did make a dent into this project today though.

FU · 08-12-2010

"It is doing it whether I am in gear or not."
Well now that we know that the problem is being isolated ....
Dual mass FW gone bad

More back ground on the car please.

rhipsher · 08-11-2010

Hey Ryan! If your home today I can come by and check it out after work. I suspect Cbeam bolts are loose. Mine did the same thing when mine were loose except for the vibration. I would suggest getting a set of Bill B's beam plates on order.

GOLDCYLON · 08-11-2010

Install the ZFDOC's beam plates while your in there

http://www.zfdoc.com/c4beamplate.htm

rhipsher · 08-12-2010

But is it more quiet than when everything was loose?

rhipsher · 08-12-2010

If you disengage your clutch and you still have the vibration then it could be your duel mass like was mentioned. Because it rotates even when your disengaged. I don't hear much about duel mass flywheels going bad especially on a low mile car like yours. Unless some crank bolts have backed out.

08-11-2010	#1
USAFPILOT Join Date: Aug 2007 Location: Spring TX Posts: 1,348	High RPM vibration all gears I first noticed it in third, but am now feeling it in 1st and 2nd. Maybe I didn't notice it before or it is getting worse. I get a strong vibration which comes on at 6500 RPM or so and keeps getting stronger the more I keep my foot in it. I am certain it is from the drive train somewhere. I feel it in the shifter mostly. Is my trans or clutch gonna puke on me soon? The car has 50,000 miles. I'm taking ideas.

08-11-2010	#2
gbmidyear66 Join Date: Feb 2008 Location: Vancouver, BC Posts: 252	Re: High RPM vibration all gears When I first got my car I noticed drivetrain vibration @ RPM, and I noticed that when I really got on it I could see the shifter height modulate by close to an inch. Turned out that the transmission mount bolts were simply loose and this is a common situation. Hope that is your case as it is a cheap fix __________________ [SIGPIC][/SIGPIC] __________________ 1990 Corvette ZR-1 #2824 4.10's, Custom PROM, Flowmaster, Top End Port NCRS BC Chapter

08-11-2010	#3
tf95ZR1 Join Date: Aug 2005 Location: Northridge, CA Posts: 1,461	Re: High RPM vibration all gears I agree, tighten everything up, but don't overtighten.

08-12-2010	#5
USAFPILOT Join Date: Aug 2007 Location: Spring TX Posts: 1,348	Re: High RPM vibration all gears Well Rick and I sorted most of the problem out, but maybe not the underlying cause. I had the shifter knob incorrectly installed so we fixed that and most of the audible noise is gone. I still have a cracked plastic piece where the allen screw seats into the shifter which is making noise but not much. And, there is still a pretty strong vibration coming through the shifter at high rpm. It is doing it whether I am in gear or not. We did make a dent into this project today though.

08-12-2010	#6
FU Join Date: Mar 2004 Location: Found Member Posts: 4,346	Re: High RPM vibration all gears "It is doing it whether I am in gear or not." Well now that we know that the problem is being isolated .... Dual mass FW gone bad More back ground on the car please.

08-11-2010	#7
rhipsher Join Date: Aug 2008 Location: Houston 90 Red ZR-1 Posts: 2,320	Re: High RPM vibration all gears Hey Ryan! If your home today I can come by and check it out after work. I suspect Cbeam bolts are loose. Mine did the same thing when mine were loose except for the vibration. I would suggest getting a set of Bill B's beam plates on order.

08-11-2010	#8
GOLDCYLON Join Date: May 2007 Location: Peoria, AZ Posts: 9,155	Re: High RPM vibration all gears Install the ZFDOC's beam plates while your in there http://www.zfdoc.com/c4beamplate.htm __________________ GOLDCYLON - 91 ZR-1 #2014 GOLDCYLON - 90 ZR-1 #2794, 4L60e (Formerly Schrade's) GOLDCYLON - 11 CTS-V Arizona State Director 91 WHITE/BLACK #2014. 380 P&P&PCed,Ported Heads, Jeal Long tubes, Corsa Exhaust/FIKSE FM-5s /LED TLs, LED Headlights, Front Wilwood 6 piston narrowlite calipers and rear Wilwood caliper street shop mod,CNCed Coolant Pipes,TPI Cvr,Filter cover,Stainless Bolts, DRM/DOM PROM /ZFDOC mod build #102,DRLs,BMAD with stainless Debris Screen,Coplan Air Blaster, Pioneer APP Radio 4,Brey-Krause HB,Sub Bar,Fire extinguisher seat mount,DRM Coilovers,LEDs everywhere,Compass mirror (orange),V1 DIC hidden display, Homelink sun visor, Carbon Fiber top x3 and APSIS Carbon Fiber interior, APSIS CF Steering Wheel/NAPA Leather, Banski trailing arms, Guldstrand front suspension,urethane bushings from Prothane (total suspension) ZFDoc drive shaft safety loop, raptor shift light (orange),AO engineering louver front plate, Console seat cushion, 96CE seats with black custom Sheepskins, ss billet catch can,Viper remote entry/alarm,Cragar Rear Louvers,LED side louver lights, Dewitts Radiator with SPAL fans and a Woods 160 T-Stat 90 RED/BLACK #2794. 4L60e Automatic Stage V by RPM Transmission, TCI Dedicated TCM, OBX Stainless Headers, Corsa Exhaust, SAN Secondaries and Haibeck PROM, Exotic Muscle Coil overs, LED Interior Lights, LED Tail Lights, LED Headlights, 94 Sport seats with black custom Sheepskins , Cragar rear louvers, GS Front calipers, Banski Trailing arms, APSIS Carbon Fiber steering wheel, Front and Rear Baer Eradispeeds, DRLs, Guldstrand front suspension,urethane bushings from Prothane (total suspension), Dewitt's Raditor with Dual SPAL fans and a Haibeck 170 T-Stat 11 RED/GREY CTS-V

08-12-2010	#9
rhipsher Join Date: Aug 2008 Location: Houston 90 Red ZR-1 Posts: 2,320	Re: High RPM vibration all gears But is it more quiet than when everything was loose?

08-12-2010	#10
rhipsher Join Date: Aug 2008 Location: Houston 90 Red ZR-1 Posts: 2,320	Re: High RPM vibration all gears If you disengage your clutch and you still have the vibration then it could be your duel mass like was mentioned. Because it rotates even when your disengaged. I don't hear much about duel mass flywheels going bad especially on a low mile car like yours. Unless some crank bolts have backed out.